TERRA INDUSTRIES INC
10-Q, 1999-08-12
MISCELLANEOUS NONDURABLE GOODS
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<PAGE>

================================================================================

                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                   FORM 10-Q


             [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934

                 For the quarterly period ended June 30, 1999

                                      OR

             [_] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934

            For the transition period from __________ to __________

                        Commission file number:  1-8520


                             TERRA INDUSTRIES INC.
            (Exact name of registrant as specified in its charter)


                 Maryland                            52-1145429
     (State or other jurisdiction of              (I.R.S. Employer
       incorporation or organization)            Identification No.)


                Terra Centre                         51102-6000
                P.O. Box 6000                         (Zip Code)
             600 Fourth Street
              Sioux City, Iowa
  (Address of principal executive offices)


      Registrant's telephone number, including area code:  (712) 277-1340


  Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X] No [_]

  As of July 31, 1999, the following shares of the registrant's stock were
outstanding:

       Common Shares, without par value     75,462,440 shares

===============================================================================


<PAGE>

                         PART I. FINANCIAL INFORMATION

                             TERRA INDUSTRIES INC.
                 CONSOLIDATED STATEMENTS OF FINANCIAL POSITION
                                (in thousands)
                                  (unaudited)
<TABLE>
<CAPTION>

                                                          June 30,      December 31,      June 30,
                                                            1999            1998            1998
                                                         ----------     -----------      ----------
<S>                                                      <C>            <C>              <C>
ASSETS
Cash and short-term investments                          $   36,267     $  141,643       $   85,179
Accounts receivable, less allowance for
 doubtful accounts of $15,414, $15,134, $14,875             182,566        116,234          100,431
Inventories                                                 131,321        169,232          120,405
Net current assets of discontinued operations                   ---         17,194          286,646
Other current assets                                         67,700         37,900           26,637
- ---------------------------------------------------------------------------------------------------
Total current assets                                        417,854        482,203          619,298
- ---------------------------------------------------------------------------------------------------
Equity and other investments                                  1,894          1,986            2,189
Property, plant and equipment, net                        1,006,563      1,017,885        1,011,005
Excess of cost over net assets of acquired businesses       261,241        272,553          274,878
Deferred tax asset                                            7,049          6,202            7,286
Net long-term assets of discontinued operations                 ---        188,089          214,295
Other assets                                                 55,276         83,977           88,129
- ---------------------------------------------------------------------------------------------------
Total assets                                             $1,749,877     $2,052,895       $2,217,080
===================================================================================================

LIABILITIES
Debt due within one year                                 $   23,499     $    9,470       $    9,474
Accounts payable                                             39,840        107,007          104,075
Accrued and other liabilities                               156,150         97,678          170,641
- ---------------------------------------------------------------------------------------------------
Total current liabilities                                   219,489        214,155          284,190
- ---------------------------------------------------------------------------------------------------
Long-term debt                                              477,608        487,560          496,293
Deferred income taxes - noncurrent                          204,153        204,153          193,376
Other liabilities                                            59,815         62,671           81,977
Minority interest                                           110,179        336,504          345,478
- ---------------------------------------------------------------------------------------------------
Total liabilities                                         1,071,244      1,305,043        1,401,314
- ---------------------------------------------------------------------------------------------------

STOCKHOLDERS' EQUITY
Capital stock
    Common Shares, authorized 133,500 shares;
     outstanding 75,462, 75,465 and 74,896 shares           127,890        127,887          127,622
Paid-in capital                                             552,903        552,893          549,005
Accumulated other comprehensive loss                        (27,751)       (14,157)          (8,167)
Retained earnings                                            25,591         81,229          147,306
- ---------------------------------------------------------------------------------------------------
Total stockholders' equity                                  678,633        747,852          815,766
- ---------------------------------------------------------------------------------------------------
Total liabilities and stockholders' equity               $1,749,877     $2,052,895       $2,217,080
===================================================================================================
</TABLE>

See accompanying Notes to the Consolidated Financial Statements.

                                                                               2
<PAGE>

                             TERRA INDUSTRIES INC.
                       CONSOLIDATED STATEMENTS OF INCOME
                   (in thousands, except per-share amounts)
                                  (unaudited)
<TABLE>
<CAPTION>

                                                     Three Months Ended          Six Months Ended
                                                          June 30,                   June 30,
                                                      1999       1998           1999           1998
                                                    ---------  ---------      ---------      ---------
<S>                                                 <C>        <C>            <C>            <C>
REVENUES
Net sales                                           $ 222,459  $ 273,583      $ 403,400      $ 468,170
Other income, net                                       3,798      4,462          8,524          7,957
- ------------------------------------------------------------------------------------------------------
Total Revenues                                        226,257    278,045        411,924        476,127
- ------------------------------------------------------------------------------------------------------

COSTS AND EXPENSES
Cost of sales                                         221,842    245,629        413,648        412,301
Selling, general and administrative expense            10,897     17,628         25,293         32,781
Equity in earnings of unconsolidated affiliates        (2,384)    (2,727)          (675)        (1,391)
- ------------------------------------------------------------------------------------------------------
                                                      230,355    260,530        438,266        443,691
- ------------------------------------------------------------------------------------------------------
Income (loss) from operations                          (4,098)    17,515        (26,342)        32,436
Interest income                                         7,180         40          7,208             65
Interest expense                                      (12,959)   (12,265)       (25,575)       (24,502)
Minority interest                                      (5,473)   (10,859)        (9,628)       (17,160)
- ------------------------------------------------------------------------------------------------------
Loss from continuing operations
  before income taxes                                 (15,350)    (5,569)       (54,337)        (9,161)
Income tax provision                                    6,215      2,848         21,800          4,339
- ------------------------------------------------------------------------------------------------------
Loss from continuing operations                        (9,135)    (2,721)       (32,537)        (4,822)
Income (loss) from discontinued operations:
  Income (loss) from operations, net of taxes             ---     53,339         (5,800)        37,160
  Loss on disposition, net of taxes                    (4,723)       ---         (4,723)           ---
- ------------------------------------------------------------------------------------------------------
Income (loss) before extraordinary items              (13,858)    50,618        (43,060)        32,338
Extraordinary loss on early retirement of debt         (7,295)       ---         (7,295)           ---
- ------------------------------------------------------------------------------------------------------

NET INCOME (LOSS)                                   $ (21,153) $  50,618      $ (50,355)     $  32,338
======================================================================================================

Basic earnings per share:
  Loss from continuing operations                   $   (0.12) $   (0.04)     $   (0.44)     $   (0.06)
  Income (loss) from discontinued operations            (0.07)      0.72          (0.14)          0.50
  Extraordinary loss on early retirement of debt        (0.10)       ---          (0.10)           ---
- ------------------------------------------------------------------------------------------------------
  Net income (loss)                                 $   (0.29) $    0.68      $   (0.68)     $    0.44
======================================================================================================

Diluted earnings per share:
  Loss from continuing operations                   $   (0.12) $   (0.04)     $   (0.44)     $   (0.06)
  Income (loss) from discontinued operations            (0.07)      0.71          (0.14)          0.49
  Extraordinary loss on early retirement of debt        (0.10)       ---          (0.10)           ---
- ------------------------------------------------------------------------------------------------------
  Net income (loss)                                 $   (0.29) $    0.67      $   (0.68)     $    0.43
======================================================================================================

Basic weighted average shares outstanding              74,168     73,896         74,167         73,878
Diluted weighted average shares outstanding            74,168     75,054         74,167         75,099
======================================================================================================

Cash dividends declared per share                   $    0.02  $    0.05      $    0.07      $    0.10
======================================================================================================
</TABLE>

See accompanying Notes to the Consolidated Financial Statements.

                                                                               3
<PAGE>

                             TERRA INDUSTRIES INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                (in thousands)
                                  (unaudited)

<TABLE>
<CAPTION>
                                                                Six Months Ended
                                                                    June 30,
                                                          ----------------------------
                                                              1999              1998
                                                          ------------       ---------
<S>                                                       <C>                <C>
OPERATING ACTIVITIES
Net loss from continuing operations                       $    (32,537)      $  (4,822)
Adjustments to reconcile net loss from continuing
 operations to net cash used in operating activities:
  Depreciation and amortization                                 50,020          45,174
  Deferred income taxes                                         (4,069)          2,642
  Minority interest in earnings                                  9,628          17,160
  Other non-cash items                                             534          (1,403)
Changes in current assets and liabilities excluding
 working capital purchased/sold during the period:
  Accounts receivable                                          (97,086)        (31,504)
  Inventories                                                   37,911          40,729
  Other current assets                                          (8,376)          9,682
  Accounts payable                                             (52,193)        (37,996)
  Accrued and other liabilities                                 15,380          48,342
  Reimbursed Port Neal casualty                                    ---          14,314
Other                                                            8,196           5,820
- --------------------------------------------------------------------------------------
Net cash from operating activities                             (72,592)        108,138
- --------------------------------------------------------------------------------------
INVESTING ACTIVITIES
Purchase of property, plant and equipment                      (26,713)        (27,793)
Discontinued operations                                        242,627        (136,012)
Other items                                                    (11,552)          1,058
- --------------------------------------------------------------------------------------
Net cash provided by (used in) investing activities            204,362        (162,747)
- --------------------------------------------------------------------------------------
FINANCING ACTIVITIES
Net short-term borrowings                                       12,000             ---
Principal payments on long-term debt                            (7,923)           (801)
Redemption of preferred minority interest                     (224,998)            ---
Repurchases of TNCLP common units                               (1,526)        (16,255)
Distributions to minority interests                             (9,429)        (15,996)
Dividends                                                       (5,283)         (7,496)
Other                                                               13             274
- --------------------------------------------------------------------------------------
Net cash used in financing activities                         (237,146)        (40,274)
- --------------------------------------------------------------------------------------
Increase (decrease) to cash and short-term investments        (105,376)        (94,883)
Cash and short-term investments at beginning of period         141,643         180,062
- --------------------------------------------------------------------------------------
Cash and short-term investments at end of period          $     36,267       $  85,179
======================================================================================
</TABLE>

See accompanying Notes to the Consolidated Financial Statements

                                                                               4
<PAGE>

                             TERRA INDUSTRIES INC.
          CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
                    SIX MONTHS ENDED JUNE 30, 1999 AND 1998
                                (in thousands)
                                  (unaudited)

<TABLE>
<CAPTION>
                                                        Accumulated
                                                           Other
                                Capital     Paid-In    Comprehensive   Retained
                                 Stock      Capital        Loss        Earnings      Total
- --------------------------------------------------------------------------------------------
<S>                             <C>       <C>          <C>            <C>          <C>
Balance at December 31, 1998    $127,887  $   552,893  $     (14,157) $   81,229   $ 747,852

  Comprehensive income:
     Net loss                        ---          ---            ---     (50,355)    (50,355)
     Foreign currency
      translation adjustment         ---          ---        (13,594)        ---     (13,594)

  Exercise of stock options            3           10            ---         ---          13

  Dividends                          ---          ---            ---      (5,283)     (5,283)
  ------------------------------------------------------------------------------------------
Balance at June 30, 1999        $127,890  $   552,903  $     (27,751) $   25,591   $ 678,633
============================================================================================
</TABLE>

<TABLE>
<CAPTION>
                                                        Accumulated
                                                           Other
                                Capital     Paid-In    Comprehensive   Retained
                                 Stock      Capital        Loss        Earnings      Total
- --------------------------------------------------------------------------------------------
<S>                             <C>       <C>          <C>            <C>          <C>
Balance at December 31, 1997    $127,581  $   548,772  $      (8,488) $  122,464   $ 790,329

  Comprehensive income:
     Net income                      ---          ---            ---      32,338      32,338
     Foreign currency
      translation adjustment         ---          ---            321         ---         321

  Exercise of stock options           41          233            ---         ---         274

  Dividends                          ---          ---            ---      (7,496)     (7,496)
- --------------------------------------------------------------------------------------------
Balance at June 30, 1998        $127,622  $   549,005  $      (8,167) $  147,306   $ 815,766
============================================================================================
</TABLE>

See accompanying Notes to the Consolidated Financial Statements

                                                                               5
<PAGE>

                             TERRA INDUSTRIES INC.
                NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
                                  (unaudited)

1.   The accompanying unaudited consolidated financial statements and notes
     thereto contain all adjustments necessary to summarize fairly the financial
     position of Terra Industries Inc. and all majority-owned subsidiaries (the
     "Corporation") and the results of the Corporation's operations for the
     periods presented. Because of the seasonal nature of the Corporation's
     operations and effects of weather-related conditions in several of its
     marketing areas, results of operations of any single reporting period
     should not be considered as indicative of results for a full year. Certain
     reclassifications have been made to prior years' financial statements to
     conform with current year presentation. These statements should be read in
     conjunction with the Corporation's 1998 Annual Report to Stockholders.

2.   On June 30, 1999, the Corporation sold its Distribution business segment to
     Cenex/ Land O' Lakes Agronomy Company ("Buyer") and received the
     preliminary purchase price of $390 million in cash. The preliminary
     purchase price is subject to post closing adjustments and final audit. The
     Corporation's current assets at June 30, 1999 included $95.2 million of
     receivables from the Buyer and others representing amounts due from the
     sale of the Distribution business segment. The Corporation expects to
     finalize post-closing adjustments, complete the final audit and collect
     remaining balances due from the sale prior to December 31, 1999.

     In the sales transaction, the Buyer acquired all rights to the Distribution
     business' earnings from April 1, 1999 forward. Included in the sale were
     the Corporation's approximately 400 retail farm service centers in the U.S.
     and Canada, and its 50% ownership position in the Omnium chemical
     formulation plants. The Corporation retained ownership of approximately $25
     million in accounts receivable and approximately 40 storage or retail sites
     associated with Distribution operations. Reserves for doubtful accounts of
     approximately $15 million have been recorded to value the retained accounts
     receivable at estimated net realizable value. The retained sites had a zero
     net book value at June 30, 1999 as costs of disposal are estimated to
     approximate sales proceeds.

     The accompanying unaudited consolidated statements of operations, financial
     position and cash flows have been restated for prior periods to segregate
     results of operations and net assets associated with the discontinued
     Distribution business segment. Net current assets of discontinued
     operations are comprised of accounts receivable, inventory and other
     current assets net of accounts payable and accrued and other liabilities
     associated with the Distribution business. Net long-term assets of
     discontinued operations are comprised of property, plant and equipment,
     goodwill and other long-term assets of the Distribution business that were
     transferred in the sales transaction.

                                                                               6
<PAGE>

     The results of discontinued operations for the three and six month periods
     ended June 30, 1999 and 1998 were as follows:

<TABLE>
<CAPTION>
                                                   Three Months Ended June 30    Six Months Ended June 30
                                                  ----------------------------  --------------------------
(in thousands)                                            1999            1998        1999            1998
- ----------------------------------------------------------------------------------------------------------
<S>                                               <C>            <C>            <C>          <C>
      Total revenue                               $        ---   $     981,204  $  228,991   $   1,248,794
      Cost of sales                                        ---        (799,433)   (186,647)     (1,027,443)
      Selling, general and
         administrative expense                            ---         (86,857)    (64,711)       (157,465)
      Equity in earnings of affiliates                     ---             508         696           1,149
- ----------------------------------------------------------------------------------------------------------

           Operating income (loss) as reported             ---          95,422     (21,671)         65,035
      Allocated general and
         administrative expense                            ---           5,093       3,466           9,026
- ----------------------------------------------------------------------------------------------------------

           Operating income (loss) - restated              ---         100,515     (18,205)         74,061

      Gain on sale of unconsolidated
         affiliate                                         ---             ---       9,804             ---
      Interest income                                      ---           2,582         938           4,125
      Interest expense                                     ---          (4,842)     (2,202)         (7,587)
      Income taxes                                         ---         (44,916)      3,865         (33,439)
- ----------------------------------------------------------------------------------------------------------

           Income (loss) from
              discontinued operations                      ---          53,339      (5,800)         37,160

      Loss on disposition, net of taxes                 (4,723)            ---      (4,723)            ---
- ----------------------------------------------------------------------------------------------------------

           Net income (loss) from
              discontinued operations             $     (4,723)  $      53,339  $  (10,523)  $      37,160
==========================================================================================================
</TABLE>

      The sale of the Distribution business segment was effective April 1, 1999
      with respect to segment operating results and, consequently, results of
      operations for the three months ended June 30, 1999 accrued to the Buyer.
      Distribution revenues and cost of sales are net of inter-company sales
      from the Corporation's Nitrogen business segment of $9.5 million for the
      three month period ended June 30, 1998 and $8.9 million and $12.2 million
      for the six month periods ended June 30, 1999 and 1998, respectively.
      Interest income and expense allocated to the Distribution business
      represents interest earned or expensed from short-term investments or
      borrowings caused by seasonal fluctuations to Distribution working capital
      balances. None of the Corporation's long-term interest expense was
      allocated to earnings from discontinued operations.

      The Buyer and the Corporation have also entered into a three-year nitrogen
      fertilizer supply agreement through which the Buyer will purchase
      approximately the quantity that the Corporation's Nitrogen Products
      segment supplied to both the Distribution business and the Buyer.

3.    Basic earnings per share data are based on the weighted-average number of
      Common Shares outstanding during the period. Diluted earnings per share
      data are based on the weighted-average number of Common Shares outstanding
      and the effect of all dilutive potential common shares including stock
      options, restricted shares and contingent shares.

                                                                               7
<PAGE>

4.   Inventories consisted of the following:

<TABLE>
<CAPTION>
                             June 30,  December 31,  June 30,
     (in thousands)            1999        1998        1998
- -------------------------------------------------------------
     <S>                     <C>       <C>           <C>
     Raw materials           $ 56,734  $     60,676  $ 56,303
     Finished goods            76,587       108,556    64,102
- -------------------------------------------------------------
     Total                   $131,321  $    169,232  $120,405
=============================================================
</TABLE>

5.   The Corporation and certain of its subsidiaries are involved in various
     legal actions and claims, including environmental matters, arising during
     the normal course of business. Although it is not possible to predict with
     any certainty the outcome of such matters, it is the opinion of management
     that these matters will not have a material adverse effect on the results
     of operations, financial position or cash flows of the Corporation.

6.   The Corporation's natural gas procurement policy is to effectively fix or
     cap the price of between 40% and 80% of its natural gas requirements for a
     one-year period and up to 50% of its natural gas requirements for the
     subsequent two-year period through supply contracts, financial derivatives
     and other forward pricing techniques. These contracts reference physical
     natural gas prices or appropriate NYMEX futures contract prices. Contract
     physical prices are frequently based on prices at the Henry Hub in
     Louisiana, the most common and financially liquid location of reference for
     financial derivatives related to natural gas. However, natural gas supplies
     for the Corporation's six North American production facilities are
     purchased for each plant at locations other than Henry Hub which often
     creates a location basis differential between the contract price and the
     physical price of natural gas. Accordingly, the use of financial
     derivatives may not exactly offset the change in the price of physical gas.
     The contracts are traded in months forward and settlement dates are
     scheduled to coincide with gas purchases during that future period.

     The Corporation has entered into firm contracts to minimize the risk of
     interruption or curtailment of natural gas supplies. Additionally, the
     Corporation has entered into forward pricing positions for a substantial
     portion of its natural gas requirements for the remainder of 1999 and 2000,
     consistent with its policy. As a result of its policies, the Corporation
     has reduced the potential adverse financial impact of natural gas price
     increases during the forward pricing period, but conversely, if natural gas
     prices were to fall, the Corporation will incur higher costs. Unrealized
     gains from forward pricing positions totaled $21.4 million as of June 30,
     1999. The amount recognized by the Corporation will be dependent on prices
     in effect at the time of settlement.

     For the first half of 1999, natural gas hedging activities increased
     natural gas costs $13.4 million compared with spot prices.

7.   During the 1999 second quarter and in connection with its sale of the
     Distribution business segment the Corporation renegotiated its revolving
     credit facility and reduced the available line of credit to $62 million for
     working capital needs and other corporate purposes. Under the credit
     facility, there was $12 million outstanding all of which was classified as
     short-term borrowing at June 30, 1999. Interest on borrowings under this
     line is charged at current market rates.

8.   The Corporation temporarily shut down production at its Beaumont, Texas
     methanol plant in January 1999 due to methanol sales prices being less than
     raw material costs. The plant came back on stream March 29, 1999.

                                                                               8
<PAGE>

     9.   The Corporation classifies its continuing operations into two business
          segments: Nitrogen Products and Methanol. The Nitrogen Products
          business produces and distributes ammonia, urea, nitrogen solutions
          and ammonium nitrate to farm distributors and industrial users. The
          Methanol business manufactures and distributes methanol which is used
          in the production of a variety of chemical derivatives and in the
          production of methyl tertiary butyl ether (MTBE), an oxygenate and an
          octane enhancer for gasoline. The Corporation does not allocate
          interest, income taxes or infrequent items to continuing business
          segments. Included in Other are general corporate activities not
          attributable to a specific industry segment. Discontinued operations
          represent the Corporation's Distribution business segment which was
          sold during the 1999 second quarter. The following summarizes
          operating results by business segment:

<TABLE>
<CAPTION>

                                              Three Months Ended June 30    Six Months Ended June 30
                                              --------------------------    -------------------------
          (in thousands)                            1999          1998            1999          1998
          -------------------------------------------------------------------------------------------
          <S>                                 <C>           <C>             <C>           <C>
          Revenues - Nitrogen Products        $  195,568    $  254,227      $  375,298    $  423,365
                   - Methanol                     22,773        20,840          33,564        54,811
                   - Other                         7,916         2,978           3,062        (2,049)
          -------------------------------------------------------------------------------------------
            Total revenues                    $  226,257    $  278,045      $  411,924    $  476,127
          ===========================================================================================
          Operating income
                   - Nitrogen Products        $     (686)   $   27,718      $   (9,353)   $   39,496
                   - Methanol                     (3,746)       (6,188)        (12,984)        1,051
                   - Other                           334        (4,015)         (4,005)       (8,111)
          -------------------------------------------------------------------------------------------
            Total operating income                (4,098)       17,515         (26,342)       32,436
          -------------------------------------------------------------------------------------------

          Interest income                          7,180            40           7,208            65
          Interest expense                       (12,959)      (12,265)        (25,575)      (24,502)
          Minority interest                       (5,473)      (10,859)         (9,628)      (17,160)
          Income taxes                             6,215         2,848          21,800         4,339
          -------------------------------------------------------------------------------------------
          Income (loss) from
               continuing operations              (9,135)       (2,721)        (32,537)       (4,822)

          Income (loss) from discontinued
          operations, net of taxes                (4,723)       53,339         (10,523)       37,160
          -------------------------------------------------------------------------------------------
               Net income (loss) before
               extraordinary items               (13,858)       50,618         (43,060)       32,338

          Extraordinary loss on
            early debt retirement                 (7,295)           --          (7,295)           --
          -------------------------------------------------------------------------------------------
          Net income (loss)                   $  (21,153)   $   50,618      $  (50,355)   $   32,338
          ===========================================================================================
 </TABLE>

                                                                               9
<PAGE>

MANAGEMENT'S DISCUSSION AND ANALYSIS OF RESULTS OF
OPERATIONS AND FINANCIAL CONDITION


RESULTS OF OPERATIONS
- ---------------------

QUARTER ENDED JUNE 30, 1999 COMPARED WITH
QUARTER ENDED JUNE 30, 1998

Consolidated Results

The Corporation reported a net loss of $21.2 million for the 1999 second quarter
compared with net income of $50.6 million in 1998. During the 1999 second
quarter, the Corporation completed the sale of its Distribution business segment
effective as of April 1, 1999 with respect to segment earnings and realized a
$4.7 million net loss on disposition. During the 1998 second quarter,
discontinued Distribution operations generated $53.3 million of net income from
operations. Distribution operations are highly seasonal with the majority of
revenues and generally all of its annual operating income generated during the
second calendar quarter coincident with the spring planting season. In
connection with sale of the Distribution business segment, the Corporation
repaid outstanding bank obligations and realized a $7.3 million extraordinary
loss on early retirement of debt during the 1999 second quarter.

Loss from continuing operations for the 1999 second quarter was $9.1 million
compared to the 1998 loss of $2.7 million. The increased 1999 loss from
continuing operations was primarily related to reduced operating income as the
result of lower nitrogen prices.

The Corporation classifies its remaining operations into two business segments:
Nitrogen Products and Methanol. The Nitrogen Products segment represents only
operations directly related to the wholesale sales of nitrogen products from the
Corporation's ammonia production and upgrading facilities. The Methanol segment
represents wholesale sales of methanol produced at the Corporation's two
methanol manufacturing facilities.

Total revenues and operating income (loss) by segment for the three-month
periods ended June 30, 1999 and 1998 were as follows:

<TABLE>
<CAPTION>
(in thousands)                                            1999         1998
- ------------------------------------------------------------------------------
<S>                                                   <C>          <C>
REVENUES:
Nitrogen Products                                     $  195,568   $  254,227
Methanol                                                  22,773       20,840
Other                                                      7,916        2,978
- ------------------------------------------------------------------------------
                                                      $  226,257   $  278,045
==============================================================================

OPERATING INCOME (LOSS):
Nitrogen Products                                     $     (686)  $   27,718
Methanol                                                  (3,746)      (6,188)
Other expense - net                                          334       (4,015)
- ------------------------------------------------------------------------------
                                                      $   (4,098)  $   17,515
==============================================================================
</TABLE>

                                                                              10
<PAGE>

Nitrogen Products

Volumes and prices for the three-month periods ended June 30, 1999 and 1998 were
as follows:

<TABLE>
<CAPTION>
VOLUMES AND PRICES
                                           1999               1998
- ------------------------------------------------------------------------------
                                      Sales    Average     Sales    Average
(quantities in thousands of tons)    Volumes  Unit Price  Volumes  Unit Price
- ------------------------------------------------------------------------------
<S>                                  <C>      <C>         <C>      <C>
Ammonia                                  458  $      127      456        $152
Nitrogen solutions                     1,102          65    1,400          71
Urea                                     136         103      167         140
Ammonium nitrate                         156         112      164         137
- ------------------------------------------------------------------------------
</TABLE>

Nitrogen revenues declined $59 million to $195.6 million in the 1999 second
quarter compared with $254.2 million in the 1998 quarter. Lower 1999 revenues
were due to lower second quarter prices and volumes, in particular for nitrogen
solutions revenues which were $28 million lower in 1999 than the prior year.
Reductions to selling prices for ammonia, urea and ammonium nitrate of 16%, 26%
and 18%, respectively, reduced revenues in the 1999 quarter compared with 1998
by an additional $21 million. Continued industry over-capacity coupled with
lower U.S demand from reductions to planted corn and wheat acres caused nitrogen
prices to fall from prior year levels. Nitrogen solution sales volumes were also
adversely affected by increased competition as the result of expanded domestic
production capacity during the past year and Spring planting conditions that
favored ammonia consumption as an alternative to nitrogen solutions.

The Nitrogen segment had an operating loss of $ .7 million for the second
quarter of 1999 compared with operating income of $27.7 million for the 1998
second quarter. The decline in operating income was primarily related to lower
selling prices which were $27.2 million lower in 1999 than the prior year
quarter. Natural gas costs during the 1999 second quarter increased $2.7 million
over the same 1998 period, but this and other cost increases were mostly offset
by lower operating costs at the Corporation's UK facilities acquired at the
beginning of 1998.

In connection with the second quarter Distribution business sale, Cenex/Land O'
Lakes and the Corporation entered into a three-year nitrogen supply agreement
through which Cenex/Land O' Lakes will purchase approximately the quantity that
the Corporation's Nitrogen Products segment supplied to both the Distribution
business and Cenex/Land O' Lakes.

Methanol

For the three months ended June 30, 1999 and 1998, respectively, the Methanol
segment had revenues of $22.8 million and $20.8 million. Sales volumes
approximated prior year levels, but selling prices increased 10% as the result
of more balanced industry inventories to demand than was the case in the 1998
second quarter.

The Methanol segment generated a $3.7 million operating loss in the 1999 second
quarter compared to a $6.2 million operating loss in 1998. The lower loss was
primarily the result of higher selling prices.

Other Expense - Net

Other operating income of $.3 million in the 1999 second quarter was $4.3
million favorable to the 1998 second quarter expense of $4.0 million due to the
elimination of expenses allocated to discontinued Distribution operations in
1998 and the 1999 sale of corporate aircraft which generated a $1.0 million
gain.

                                                                              11
<PAGE>

Interest Expense - Net

Interest expense, net of interest income, totaled $5.8 million during the 1999
second quarter compared with $12.2 million for the prior year period. The
decrease is primarily related to interest income of $6.3 million realized during
the quarter in connection with the sale of the Distribution business segment.

Minority Interest

Minority interest represents interest in the earnings of the publicly held
common units of Terra Nitrogen Company, L.P. (TNCLP) and a third-party's limited
partnership interest in Beaumont Methanol, Limited Partnership (BMLP).  Minority
interest was $5.5 million for the second quarter 1999 compared with $10.9
million in 1998.  Minority interest declined due primarily to lower earnings
from TNCLP operations.

Minority interest charges for the limited partnership interest in BMLP were $4.7
million during the 1999 second quarter. The Corporation redeemed the third-
party's BMLP interest on June 30, 1999 and thereby eliminated future charges to
earnings relating to the minority BMLP partnership interest.

Income Taxes

Income taxes for the second quarter 1999 were recorded at an effective tax rate
of 40%, comparable to the effective tax rate for the 1998 second quarter.

SIX MONTHS ENDED JUNE 30, 1999 COMPARED WITH
SIX MONTHS ENDED JUNE 30, 1998

Consolidated Results

The Corporation reported a net loss of $50.4 million for the six months ended
June 30, 1999 compared with net income of $32.3 million in 1998.  During the
1999 second quarter, the Corporation sold its Distribution business segment
which generated a $10.5 million net loss during the 1999 first half compared to
net income of $37.2 million in the same 1998 period. In connection with sale of
the Distribution business segment, the Corporation repaid outstanding bank
obligations and realized a $7.3 million extraordinary loss on early retirement
of debt.

The Corporation had a $32.5 million net loss from continuing operations during
the six months ending June 30, 1999 compared to a $ 4.8 million loss in 1998.
The larger loss in 1999 was related primarily to lower prices for the commodity
nitrogen and methanol products manufactured and sold by the Corporation.

Total revenues and operating income (loss) by segment for the six-month periods
ended June 30, 1999 and 1998 were as follows:

<TABLE>
<CAPTION>
(in thousands)                                            1999         1998
- ------------------------------------------------------------------------------
<S>                                                   <C>          <C>
REVENUES:
Nitrogen Products                                     $  375,298   $  423,365
Methanol                                                  33,564       54,811
Other                                                      3,062       (2,049)
- ------------------------------------------------------------------------------
                                                      $  411,924   $  476,127
==============================================================================

OPERATING INCOME (LOSS):
Nitrogen Products                                     $   (9,353)  $   39,496
Methanol                                                 (12,984)       1,051
Other expense - net                                       (4,005)      (8,111)
- ------------------------------------------------------------------------------
                                                      $  (26,342)  $   32,436
==============================================================================
</TABLE>

                                                                              12
<PAGE>

Nitrogen Products

Volumes and prices for the six-month periods ended June 30, 1999 and 1998 were
as follows:

<TABLE>
<CAPTION>
VOLUMES AND PRICES
                                           1999                  1998
- ------------------------------------------------------------------------------
                                      Sales    Average     Sales    Average
(quantities in thousands of tons)    Volumes  Unit Price  Volumes  Unit Price
- ------------------------------------------------------------------------------
<S>                                  <C>      <C>         <C>      <C>
Ammonia                                  817  $      122      699  $      153
Nitrogen solutions                     1,904          64    2,042          69
Urea                                     314          99      351         126
Ammonium nitrate                         435         115      374         138
- ------------------------------------------------------------------------------
</TABLE>

Nitrogen revenues declined $48 million to $375.3 million in the 1999 first half
compared with $423.4 million in the 1998 period due to lower selling prices.
Continued industry over-capacity coupled with lower U.S demand from reductions
to planted corn and wheat acres caused nitrogen prices to fall from prior year
levels. Nitrogen solution sales volumes were also adversely affected by
increased competition as the result of expanded domestic production capacity
during the past year and Spring planting conditions that favored ammonia
consumption as an alternative to nitrogen solutions.

The Nitrogen segment had an operating loss of $9.4 million during the six months
ended June 30, 1999 compared with operating income of $39.5 million for the same
1998 period. The decline in operating income was primarily related to lower
selling prices. Natural gas costs during the 1999 first half increased $8.9
million over the same 1998 period, but this and other cost increases were mostly
offset by lower operating costs at the Corporation's UK facilities acquired at
the beginning of 1998.

Methanol

For the six months ended June 30, 1999 and 1998, respectively, the Methanol
segment had revenues of $33.6 million and $54.8 million. The Beaumont plant was
shut down for two months during the 1999 first quarter which primarily caused
the significant decline in 1999 revenues. The Corporation made the decision to
cease production because raw material costs exceeded selling prices. As a result
of the shutdown, sales volumes declined by 25% to 110 million gallons compared
with the 1998 first half.

The methanol segment had an operating loss of $13.0 million for the first six
months of 1999 compared with operating income of $1.1 million for the 1998
period. The increased operating loss was a result of the first quarter 1999
plant shutdown including $2.8 million of losses on its natural gas hedges which
were not required due to the plant shutdown.

Other Expense - Net

The Corporation had $4.0 million of other operating expenses during the 1999
first half compared to $8.1 million during the 1998 period. Most of these
expenses represent allocations of shared services expenses to discontinued
Distribution operations which amounted to $3.5 million and $9.0 million for the
first six months of 1999 and 1998, respectively.

                                                                              13
<PAGE>

Interest Expense - Net

Interest expense, net of interest income, totaled $18.4 million during the 1999
first half compared with $24.4 million for the prior year period. The decrease
is primarily related to interest income of $6.3 million realized during the
second quarter in connection with the sale of the Distribution business segment.

Minority Interest

Minority interest represents interest in the earnings of the publicly held
common units of Terra Nitrogen Company, L.P. (TNCLP) and a third-party's limited
partnership interest in Beaumont Methanol, Limited Partnership (BMLP). Minority
interest was $9.6 million for the six months ended June 30, 1999 compared with
$17.2 million in 1998. Minority interest declined due primarily to lower
earnings from TNCLP operations.

Minority interest charges for the limited partnership interest in BMLP were $9.4
million during the 1999 first half. The Corporation redeemed the third-party's
BMLP interest on June 30, 1999 and thereby eliminated future charges to earnings
relating to the minority BMLP partnership interest.

Income Taxes

Income taxes for the first half of 1999 were recorded at an effective tax rate
of 40%, comparable to the effective tax rate for the 1998 period.

LIQUIDITY AND CAPITAL RESOURCES

The Corporation's primary uses of funds will be to fund its working capital
requirements, make payments on its indebtedness and other obligations, make
capital expenditures and acquisitions and fund repurchases of TNCLP common
units. The principal sources of funds will be cash flow from operations and
borrowings under available bank facilities.

Cash used for operations in the first six months of 1999 was $73 million
comprised of $104 million to fund working capital increases, net of $31 million
in earnings from continuing operations after non-cash charges. Working capital
changes included termination of the Corporation's accounts receivable
securitization program which used cash of $130 million during the 1999 first
half to repay outstanding December 31, 1998 balances.

On June 30, 1999, the Corporation sold its Distribution business segment to
Cenex/ Land O' Lakes Agronomy Company ("Buyer") for cash proceeds of $390
million subject to post-closing adjustments and final audit. The cash proceeds,
net of increases to Distribution net working capital balances since December 31,
1998 and other operating cash items, contributed $243 million to 1999 first half
cash flows. Sales proceeds were used to redeem the outstanding preferred
minority interest in BMLP for $225 million, fund termination of the accounts
receivable securitization program and repay outstanding borrowings under the
Corporation's revolving credit facility. Remaining balances due from the Buyer
and others for the sale of the Distribution business segment totaled $95.2
million at June 30, 1999. The Corporation expects to finalize post-closing
adjustments, complete the final audit and collect remaining balances due from
the sale prior to December 31, 1999.

In connection with the sale of the Distribution business segment, the
Corporation renegotiated outstanding bank agreements and reduced amounts
available under its revolving credit facility from $225 million to $62 million.
As of June 30, 1999, $12 million was outstanding under this facility and an
additional $12 million was used to support outstanding letters of credit. The
Corporation believes that cash from operations, collection of remaining balances
due from the sale of the Distribution business segment and available financing
sources will be sufficient to meet anticipated cash requirements.

                                                                              14
<PAGE>

Management expects that nitrogen and methanol prices will remain at or near
current levels through the remainder of 1999 and into 2000. An unanticipated
decline to prices of 10% or more, or other factors causing a similar reduction
to operating income, will result in the Corporation's failure to meet certain
earnings covenants contained in its revolving credit facility and $118 million
bank term loan. Failure to meet these covenants would require the Corporation to
incur additional costs to amend the bank facilities and could result in
termination of the facilities.

The Corporation funded plant and equipment expenditures of $27 million year-to-
date in 1999. An additional $20 million of the 1999 expenditures was for the
ammonia production loop at the Beaumont, Texas methanol plant expected to be
fully operational by the end of 1999. The Corporation expects remaining 1999
capital expenditures to approximate $20 million consisting of the expenditures
to complete the Beaumont ammonia production loop, routine replacement of
equipment and efficiency improvements at manufacturing facilities.

During the first half of 1999, the Corporation distributed a preferred return of
$9.4 million to BMLP's minority partner and paid dividends of $0.07 per Common
Share which totaled $5.3 million. The Corporation redeemed the interest on June
30, 1999 and thereby eliminated future cash requirements to fund payments to the
BMLP minority partner. On August 3, 1999, the Board of Directors eliminated the
Corporation's payment of a regular quarterly dividend on common stock. This
action was taken in recognition of the very difficult market environment in
which the Corporation is operating.

Cash balances at June 30, 1999 were $36.3 million of which $4.6 million is used
to collateralize letters of credit supporting recorded liabilities.


RECENTLY ISSUED ACCOUNTING STANDARDS

In June 1998, the Financial Accounting Standards Board (FASB) issued Statement
of Financial Accounting Standards 133 (SFAS 133), "Accounting for Derivative
Instruments and Hedging Activities". SFAS 133 is effective for fiscal years
beginning after June 15, 2000. The Corporation has reviewed SFAS 133 and intends
to implement the standard on January 1, 2001. At this time, the Corporation has
not determined the impact SFAS 133 will have on its financial position, results
of operations or cash flows.


YEAR 2000 ISSUES

The Year 2000 issue concerns computer programs that use only the last two digits
to identify the year in date fields. If not corrected, many of these computer
applications could fail or create erroneous results near January 1, 2000. This
issue affects virtually every company.

The Corporation has assigned dedicated resources to address its Year 2000 issues
with a Year 2000 Steering Committee providing management oversight and
coordination. The Corporation has also published Year 2000 Information and
Readiness Disclosures on its website (http://www.terraindustries.com). In
general, management believes the "State of Readiness" for the Corporation is
such that it will be ready for Year 2000 issues on time.

The Corporation's management information systems (MIS) environment has been
assessed for year 2000 issues and some remedial actions have been identified.
The cost of remedial actions for the MIS area is not material to the
Corporation. Nearly all of these remedial actions are complete with minimal
cost. Testing is substantially complete with the mainframe hardware systems and
the associated software, with the exception of a few software packages
originally purchased from third parties that are scheduled to be updated in
1999.

The Corporation recently completed an organization-wide review of all possible
computing functions, including the process control systems and instrumentation
in the manufacturing facilities and the diverse operations in the

                                                                              15
<PAGE>

distribution segment. Some remedial actions have been identified in a few areas,
with the bulk of those remaining principally associated with the Corporation's
U.K. operations. The cost of these remedial actions is not expected to be
material to the Corporation. Testing is substantially complete at five of the
Corporation's manufacturing facilities.

The Corporation is also assessing Year 2000 issues in relation to its customers,
suppliers and other constituents because the action or inaction of third parties
may materially affect the Corporation. An initial assessment of key third
parties, including utility suppliers, has been completed and some follow up is
ongoing.

Although the Corporation expects that there will be no significant adverse
consequences relating to its Year 2000 issues, the Corporation believes its most
reasonably likely worst case Year 2000 scenario involves the interruption of its
manufacturing facilities due to failed utility supplies or some other cause. The
Corporation has in place contingency plans to deal with such interruptions,
although restarting these facilities may be dependent on the resumption of
utilities from sole source suppliers. Other general contingency planning efforts
continue to be evaluated and refined for precautionary purposes.

The Corporation anticipates that it will complete all assessment, remediation,
testing and contingency planning efforts for Year 2000 issues in the third
quarter of 1999, although implementation of two projects will be completed at
plant turnarounds scheduled for other reasons in October 1999. Based on
substantial completion of these activities to date, the Corporation anticipates
that Year 2000 issues, including the historical and estimated costs of
remediation, will not have a material effect on its business, results of
operations or financial condition. However, the costs or consequences of
incomplete or untimely resolution of Year 2000 issues by the Corporation or
third parties could have a material adverse affect on the Corporation.


POTENTIAL CHANGE OF CONTROL

Anglo American plc, through its wholly-owned subsidiaries, owns 56% of the
Corporation's outstanding shares. Anglo American has made public its intention
to dispose of its interest in the Corporation with the timing based on market
and other conditions and Anglo American otherwise announced it will continue to
evaluate its position.


FORWARD LOOKING PRECAUTIONS

Information contained in this report, other than historical information, may be
considered forward looking. Forward looking information reflects Management's
current views of future events and financial performance that involve a number
of risks and uncertainties. The factors that could cause actual results to
differ materially include, but are not limited to, the following: general
economic conditions within the agricultural industry, competitive factors and
price changes (principally, sales prices of nitrogen and methanol products and
natural gas costs), changes in product mix, changes in the seasonality of demand
patterns, changes in weather conditions, changes in agricultural regulations,
and other risks detailed in the "Factors that Affect Operating Results" section
of the Corporation's most recent Form 10-K.

                                                                              16
<PAGE>

PART II. OTHER INFORMATION


Item 6.  EXHIBITS AND REPORTS ON FORM 8-K.

               (a)  Exhibits

                    4.6  Amended and Restated Credit Agreement dated June 25,
                         1999 among Terra Capital, Inc., Certain Guarantors,
                         Certain Lenders, Certain Issuing Banks, Salomon Smith
                         Barney Inc., as Arranger, and Citibank, N.A., as
                         Administrative Agent (without exhibits or schedules).

                    4.7  Credit Agreement dated December 31, 1997 and Amended
                         and Restated June 25, 1999 among Terra International
                         (Canada) Inc., Certain Guarantors, Certain Lenders,
                         Salomon Smith Barney Inc., as Arranger, and Citibank,
                         N.A., as Administrative Agent (without exhibits or
                         schedules).

                    27   Financial Data Schedule [EDGAR filing only]

               (b)  Reports on Form 8-K

                    Form 8-K dated May 3, 1999 announcing the signing of an
                    agreement to sell the Distribution Business.

                    Form 8-K dated June 30, 1999 disclosing the completion of
                    the sale of the Distribution Business and providing pro
                    forma financial information associated with the sale.


SIGNATURE

                         Pursuant to the requirements of the Securities Exchange
Act of 1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned thereunto duly authorized.


                                      TERRA INDUSTRIES INC.



Date:  August 11, 1999                /s/ Francis G. Meyer
                                      -----------------------------------------
                                      Francis G. Meyer
                                      Senior Vice President and Chief Financial
                                      Officer  and a duly authorized signatory

                                                                              17

<PAGE>

                                                                     Exhibit 4.6

                                                                [CONFORMED COPY]

================================================================================


                     AMENDED AND RESTATED CREDIT AGREEMENT

                           dated as of June 25, 1999
                                     among


                              TERRA CAPITAL, INC.

                                  as Borrower


                              CERTAIN GUARANTORS


                                CERTAIN LENDERS


                             CERTAIN ISSUING BANKS


                          SALOMON SMITH BARNEY INC.,
                                  as Arranger


                                      and


                                CITIBANK, N.A.,
                            as Administrative Agent


================================================================================

          [Exhibits D-1 and D-2 are copies of Opinions as Delivered]
<PAGE>

                               TABLE OF CONTENTS


     This Table of Contents is not part of the Agreement to which it is attached
but is inserted for convenience of reference only.

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
                                   ARTICLE I
                       DEFINITIONS AND ACCOUNTING TERMS

Section 1.01.  Certain Defined Terms.........................................  2
Section 1.02.  Computation of Time Periods................................... 33
Section 1.03.  Accounting Terms.............................................. 33

                                  ARTICLE II
                       AMOUNTS AND TERMS OF THE ADVANCES
                           AND THE LETTERS OF CREDIT

Section 2.01.  The Advances.................................................. 34
Section 2.02.  Making the Advances........................................... 35
Section 2.03.  Repayment..................................................... 37
Section 2.04.  Termination or Reduction of the Commitments................... 37
Section 2.05.  Prepayments, Etc.............................................. 38
Section 2.06.  Interest...................................................... 40
Section 2.07.  Fees.......................................................... 41
Section 2.08.  Conversion and Continuation of Advances....................... 41
Section 2.09.  Increased Costs, Illegality, Etc.............................. 43
Section 2.10.  Payments and Computations..................................... 45
Section 2.11.  Taxes......................................................... 46
Section 2.12.  Sharing of Payments, Etc...................................... 49
Section 2.13.  Letters of Credit............................................. 49
Section 2.14.  Replacement of Lenders........................................ 53

                                  ARTICLE III
                                 CONDITIONS OF
                            RESTATEMENT AND LENDING

Section 3.01.  Conditions Precedent to Amendment and Restatement............. 55
Section 3.02.  Conditions Precedent to Each Borrowing and Issuance........... 59
Section 3.03.  Determinations Under Section 3.01............................. 59

                                  ARTICLE IV
                        REPRESENTATIONS AND WARRANTIES

Section 4.01.  Representations and Warranties of the Company................. 60
Section 4.02.  Representations and Warranties of each Lender................. 66
</TABLE>

                                      (i)
<PAGE>

<TABLE>
<S>                                                                          <C>
                                   ARTICLE V
                              COVENANTS OF TERRA

Section 5.01.  Affirmative Covenants........................................  66
Section 5.02.  Negative Covenants...........................................  72
Section 5.03.  Reporting Requirements.......................................  85
Section 5.04.  Financial Covenants..........................................  88

                                   ARTICLE VI
                               EVENTS OF DEFAULT

Section 6.01.  Events of Default............................................  90
Section 6.02.  Actions in Respect of the Letters of Credit Upon Default.....  93

                                  ARTICLE VII
                            THE ADMINISTRATIVE AGENT

Section 7.01.  Authorization and Action.....................................  94
Section 7.02.  Administrative Agent's Reliance, Etc.........................  95
Section 7.03.  Citibank and Affiliates......................................  95
Section 7.04.  Lender Credit Decision.......................................  95
Section 7.05.  Indemnification..............................................  96
Section 7.06.  Collateral Duties............................................  96
Section 7.07.  Successor Administrative Agent...............................  97

                                  ARTICLE VIII
                                 THE GUARANTEE
Section 8.01.  The Guarantee................................................  97
Section 8.02.  Obligations Unconditional....................................  98
Section 8.03.  Reinstatement................................................  99
Section 8.04.  Subrogation..................................................  99
Section 8.05.  Remedies.....................................................  99
Section 8.06.  Instrument for the Payment of Money..........................  99
Section 8.07.  Continuing Guarantee......................................... 100
Section 8.08.  Rights of Contribution....................................... 100
Section 8.09.  General Limitation on Guarantee Obligations.................. 101

                                   ARTICLE IX
                                 MISCELLANEOUS

Section 9.01.  Amendments, Consents, Etc.................................... 101
Section 9.02.  Notices, Etc................................................. 103
Section 9.03.  No Waiver; Remedies.......................................... 103
Section 9.04.  Costs, Expenses and Indemnification.......................... 104
Section 9.05.  Right of Setoff.............................................. 105
Section 9.06.  Governing Law; Submission to Jurisdiction.................... 105
Section 9.07.  Assignments and Participations............................... 106
</TABLE>

                                     (ii)
<PAGE>

<TABLE>
<S>                                                                          <C>
Section 9.08.  Execution in Counterparts.................................    109
Section 9.09.  No Liability of the Issuing Banks.........................    109
Section 9.10.  Confidentiality...........................................    110
Section 9.11.  WAIVER OF JURY TRIAL......................................    110
Section 9.12.  Survival..................................................    110
Section 9.13.  Captions..................................................    111
Section 9.14.  Successors and Assigns....................................    111
</TABLE>

ANNEX A                  Applicable Commitment Fee Rate; Applicable Margin

SCHEDULE 2.01            List of Commitments
SCHEDULE 4.01(b)         Subsidiaries
SCHEDULE 4.01(c)         List of Conflicts with Credit Instruments
SCHEDULE 4.01(d)         List of Required Authorizations, Consents
SCHEDULE 4.01(j)         Plans and Multiemployer Plans
SCHEDULE 4.01(q)         Environmental Compliance Schedule
SCHEDULE 4.01(u)         Open Tax Years
SCHEDULE 4.01(y)         Existing Debt
SCHEDULE 5.02(a)(iii)    Existing Liens
SCHEDULE 5.02(c)         Existing Hedge Agreements
SCHEDULE 5.02(f)         Investments

EXHIBIT A                Form of Note
EXHIBIT B-1              Form of Amended and Restated Holdings Pledge Agreement
EXHIBIT B-2              Form of Amended and Restated Terra Capital Pledge and
                          Security Agreement
EXHIBIT B-3              Form of Amended and Restated Subsidiary Pledge and
                          Security Agreement
EXHIBIT B-4              Form of Amended and Restated TNLP Pledge and Security
                          Agreement
EXHIBIT B-5              Form of Mortgage
EXHIBIT C                Form of Notice of Borrowing
EXHIBIT D-1              Form of Opinion of Special Counsel to the Obligors
EXHIBIT D-2              Form of Opinion of Special New York Counsel to Citibank
EXHIBIT E                Form of Confirmation of Loan Purchase Agreement
EXHIBIT E-1              Loan Purchase Agreement
EXHIBIT F                Form of Assignment and Acceptance
EXHIBIT G                Intercreditor Agreement
EXHIBIT H                Liquid Asset Coverage Certificate

                                     (iii)
<PAGE>

                               CREDIT AGREEMENT

          AMENDED AND RESTATED CREDIT AGREEMENT dated as of June 25, 1999 among:

     (1)  TERRA CAPITAL, INC., a Delaware corporation (the "Company" or the
                                                            -------
          "Borrower");
           --------

     (2)  each of the corporations and limited partnerships listed on the
          signature pages hereof under the caption "GUARANTORS";

     (3)  each of the lenders (the "Initial Lenders") listed on the signature
                                    ---------------
          pages hereof; and

     (4)  CITIBANK, N.A., as agent (together with its successor in such capacity
          appointed pursuant to Article VII, the "Administrative Agent") for the
                                                  --------------------
          Lenders and the Issuing Banks hereunder.


                            PRELIMINARY STATEMENTS:

          Capitalized terms used in these Preliminary Statements and not
otherwise defined have the meanings assigned to them in Section 1.01.

          (a)  The Company, TNLP, certain Guarantors, the Initial Lenders (or
certain of their Affiliates), the Issuing Banks and the Administrative Agent are
parties to an Amended and Restated Credit Agreement dated as of March 31, 1998
(as amended to and in effect on the Restatement Date, the "Existing Credit
                                                           ---------------
Agreement") providing, subject to the terms and conditions thereof, for the
- ---------
making of working capital advances to, and the issuance of letters of credit for
the account of, the Company and for the making of working capital advances to,
and the issuance of letters of credit for the account of, TNLP.

          (b)  Terra has entered into an Asset Sale and Purchase Agreement dated
May 3, 1999 (as from time to time amended, the "Distribution Business Sale
                                                --------------------------
Agreement") between Terra and Cenex/Land O'Lakes Agronomy Company, a Minnesota
- ---------
corporation ("Cenex"), pursuant to which Terra has agreed to sell all of its
              -----
right, title, and interest in and to the properties, assets, and rights of every
kind relating to the Distribution Business.

          (c)  The Company has requested that (i) the Initial Lenders consent to
the sale by Terra of the Distribution Business as contemplated in the
Distribution Business Sale Agreement, all on the terms and conditions set forth
herein, (ii) the "TNLP Facility" provided for under the Existing Credit
Agreement and the "TNLP Commitments" referred to therein be terminated and (iii)
the "TNLP Advances" under the Existing Credit Agreement be converted into
Advances hereunder.
<PAGE>

                                      -2-



          (d)  The Company has also requested that the Initial Lenders amend the
Existing Credit Agreement, among other things to modify certain covenants
thereof and to make certain other changes to the Existing Credit Agreement and
the other Loan Documents, all on the terms and conditions set forth herein, it
being the intention of the parties hereto that the advances and letters of
credit outstanding under the Existing Credit Agreement on the Restatement Date
shall continue and remain outstanding and not be repaid on the Restatement Date.

          NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements contained herein, the parties hereto hereby agree that
the Existing Credit Agreement shall (subject to the satisfaction of the
conditions precedent specified in Section 3) be amended and restated to read as
set forth herein.


                                   ARTICLE I

                       DEFINITIONS AND ACCOUNTING TERMS

          Section 1.01.  Certain Defined Terms. As used in this Agreement, the
                         ---------------------
following terms shall have the following meanings (such meanings to be equally
applicable to both the singular and plural forms of the terms defined):

          "Acquired Debt" means, without duplication:
           -------------

               (a)  Debt of Subsidiaries of Terra acquired by Terra or any of
          its Subsidiaries after the Restatement Date;

               (b)  Debt assumed by Terra (whether by operation of law or
          contract or otherwise) in connection with mergers by Terra after the
          Restatement Date consummated in accordance with Section
          5.02(d)(ii)(y); and

               (c)  assumptions or Guarantees of other Acquired Debt by Terra or
          one of its Subsidiaries.

          "Adjusted Liquid Asset Coverage Amount" means, at any date, the Liquid
           -------------------------------------
     Asset Coverage Amount as at such date divided by three.

          "Administrative Agent" has the meaning specified in the recital of
           --------------------
     parties to this Agreement.

          "Administrative Agent's Account" means the account of the
           ------------------------------
     Administrative Agent maintained by the Administrative Agent at its office
     at 2 Penns Way, Suite 200, New Castle, Delaware, 19720, Account No. 368-
     52248, Attention:  Jacqueline Roman (or her successor), or such other
     account maintained by the Administrative Agent as may be
<PAGE>

                                      -3-

     designated by the Administrative Agent in a written notice to the Lenders,
     each Issuing Bank and the Borrower.

          "Administrative Questionnaire" means an Administrative Questionnaire
           ----------------------------
     in a form supplied by the Administrative Agent.

          "Advance" means an Advance made or outstanding pursuant to Section
           -------
     2.01(a).

          "Affiliate" means, as to any Person, any other Person that, directly
           ---------
     or indirectly, controls, is controlled by or is under common control with
     such Person or is a director or officer of such Person.  For purposes of
     this definition, the term "control" (including the terms "controlling",
                                -------                        -----------
     "controlled by" and "under common control with") of a Person means the
      -------------       -------------------------
     possession, direct or indirect, of the power to vote 10% or more of the
     voting stock of such Person or to direct or cause the direction of the
     management and policies of such Person, whether through the ownership of
     voting stock, by contract or otherwise.

          "Aggregate Outstanding Exposure" means, at any time, the aggregate
           ------------------------------
     principal amount of all Advances outstanding at such time plus the
                                                               ----
     aggregate Letter of Credit Liability at such time.

          "AMCI Senior Note Indenture" means the Indenture dated as of October
           --------------------------
     15, 1993 between Terra and Society National Bank, as Trustee, providing for
     the issuance of the AMCI Senior Notes, as from time to time amended.

          "AMCI Senior Notes" means the 10-3/4% senior notes of Terra due 2003
           -----------------
     issued pursuant to the AMCI Senior Note Indenture.

          "Ammonia Loop" means the ammonia loop facility to be constructed as an
           ------------
     extension of BMLP's methanol plant pursuant to the Engineering, Procurement
     and Construction Agreement dated as of October 20, 1997 between TNC and
     Foster Wheeler USA Corporation, as from time to time amended.

          "Ammonium Nitrate Hedging Agreement" means an agreement between Terra
           ----------------------------------
     Canada and ICI pursuant to which Terra Canada agrees to pay certain amounts
     to ICI in the event that the annual average price of ammonium nitrate
     exceeds (Pounds)100 per tonne, as from time to time amended (without
     prejudice to Section 5.02(l)).

          "Applicable Commitment Fee Rate" has the meaning specified in Annex A.
           ------------------------------

          "Applicable Lending Office" means, with respect to each Lender, such
           -------------------------
     Lender's Domestic Lending Office in the case of a Base Rate Advance and
     such Lender's Eurodollar Lending Office in the case of a Eurodollar Rate
     Advance.
<PAGE>

                                      -4-

          "Applicable Letter of Credit Fee Rate" means, at any time, a rate per
           ------------------------------------
     annum equal to the Applicable Margin for Eurodollar Rate Advances in effect
     at such time.

          "Applicable Margin" has the meaning specified in Annex A.
           -----------------

          "Assignment and Acceptance" means an assignment and acceptance entered
           -------------------------
     into by a Lender and an Eligible Assignee, and accepted by the
     Administrative Agent, in accordance with Section 9.07 and in substantially
     the form of Exhibit F.

          "Available Amount" of any Letter of Credit means the maximum amount
           ----------------
     available to be drawn under such Letter of Credit (assuming compliance with
     all conditions to drawing specified therein).

          "BAI" means Beaumont Ammonia, Inc., a Delaware corporation and
           ---
     Subsidiary of Terra U.K. Holdings.

          "Base Rate" means a fluctuating interest rate per annum in effect from
           ---------
     time to time, which rate per annum shall at all times be equal to the
     highest of:

               (a)  the rate of interest announced publicly by Citibank in New
          York, New York, from time to time, as Citibank's base rate;

               (b)  0.50% per annum above the Federal Funds Rate; and

               (c)  the sum (adjusted to the nearest 0.25% or, if there is no
          nearest 0.25%, to the next higher 0.25%) of (i) 0.50% per annum plus
          (ii) the rate obtained by dividing (x) the latest three-week moving
          average of secondary market morning offering rates in the United
          States for three-month certificates of deposit of major United States
          money center banks, such three-week moving average (adjusted to the
          bases of a year of 360 days) being determined weekly on each Monday
          (or, if such date is not a Business Day, on the next succeeding
          Business Day) for the three-week period ending on the previous Friday
          by Citibank on the basis of such rates reported by certificate of
          deposit dealers to and published by the Federal Reserve Bank of New
          York or, if such publication shall be suspended or terminated, on the
          basis of quotations for such rates received by Citibank from three New
          York certificate of deposit dealers of recognized standing selected by
          Citibank by (y) a percentage equal to 100% minus the average of the
          daily percentages specified during such three-week period by the Board
          of Governors of the Federal Reserve System (or any successor) for
          determining the maximum reserve requirement (including, but not
          limited to, any emergency, supplemental or other marginal reserve
          requirement) for Citibank with respect to liabilities consisting of or
          including (among other liabilities) three-month U.S. Dollar non-
          personal time deposits in the United States plus (iii) the average
          during such three-week period of the annual assessment rates estimated
          by Citibank for
<PAGE>

                                      -5-

          determining the then current annual assessment rate payable by
          Citibank to the Federal Deposit Insurance Corporation (or any
          successor) for insuring U.S. Dollar deposits of Citibank in the United
          States.

     Each change in any interest rate provided for herein based upon the Base
     Rate resulting from a change in the Base Rate shall take effect at the time
     of such change in the Base Rate.

          "Base Rate Advance" means an Advance that bears interest as provided
           -----------------
     in Section 2.06(a)(i).

          "Basic Documents" means the Loan Documents and the Intercreditor
           ---------------
     Agreement.

          "Beaumont Holdings" means Beaumont Holdings Corporation, a Delaware
           -----------------
     corporation and wholly owned Subsidiary of BMCH.

          "BMCH" means BMC Holdings, Inc., a Delaware corporation.
           ----

          "BMLP" means Beaumont Methanol, Limited Partnership, a Delaware
           ----
     limited partnership.

          "BMLP Class A Limited Partner" means the holder from time to time of
           ----------------------------
     the BMLP Class A Limited Partnership Interest.

          "BMLP Class A Limited Partnership Interest" means the Class A limited
           -----------------------------------------
     partnership interest in BMLP.

          "BMLP Mortgage" means a Deed of Trust, Assignment of Rents, Security
           -------------
     Agreement and Fixture Filing in substantially the form attached hereto as
     Exhibit B-5 among BMLP, BAI and the Collateral Agent, as amended from time
     to time.

          "BMLP Partnership Agreement" means the Second Amended and Restated
           --------------------------
     Agreement of Limited Partnership of BMLP dated as of March 31, 1998 among
     TMC, as general partner, BMCH, as Class B Limited Partner, and Nova
     Products LLC, as BMLP Class A Limited Partner, or their successors and
     assigns, as amended pursuant to the documentation delivered under Section
     3.01(p) and as amended from time to time (without prejudice to Section
     5.02(j)).

          "BMLP Support and Option Agreement" means the Amended and Restated
           ---------------------------------
     Support and Option Agreement dated as of March 31, 1998 among the Company,
     the BMLP Class A Limited Partner and the beneficial owners of equity
     interests in the BMLP Class A Limited Partner, as from time to time
     amended.

          "Borrower" has the meaning specified in the recital of parties to this
           --------
     Agreement.
<PAGE>

                                      -6-

          "Borrower's Account" means the account of the Borrower maintained with
           ------------------
     Citibank at its office at 399 Park Avenue, New York, New York 10043,
     Account No. 4065-6098, or such other account maintained by the Borrower
     with Citibank as may be designated by the Borrower in a written notice to
     the Administrative Agent.

          "Borrowing" means a borrowing consisting of simultaneous Advances of
           ---------
     the same Type.

          "Business Day" means a day on which banks are not required or
           ------------
     authorized to close in New York City and, if such Business Day relates to a
     Eurodollar Rate Advance, on which dealings are carried on in the London
     interbank market.

          "Capital Expenditures" means, for any period with respect to any
           --------------------
     Person, the sum of all expenditures during such period (whether paid in
     cash or accrued as liabilities during such period) that, in conformity with
     GAAP, are required to be included in or reflected on the balance sheet of
     such Person in respect of equipment, fixed assets, real property or
     improvements, or for replacements or substitutions therefor or additions
     thereto, plus (without duplication) the amount of expenditures deemed to be
              ----
     made in connection with equipment that is purchased simultaneously with the
     trade-in of existing equipment owned by such Person to the extent the gross
     amount of the purchase price of such purchased equipment exceeds the fair
     market value (as determined in good faith by such Person) of the equipment
     then being traded in, but excluding expenditures made in connection with
                               ---------
     the replacement or restoration of assets to the extent such replacement or
     restoration is financed from insurance proceeds paid on account of loss or
     damage to the assets so replaced or restored.

          "Capital Lease Obligations" means, for any Person, all obligations of
           -------------------------
     such Person to pay rent or other amounts under a lease of (or other
     agreement conveying the right to use) property to the extent such
     obligations are required to be classified and accounted for as a capital
     lease on a balance sheet of such Person under GAAP, and, for purposes of
     this Agreement, the amount of such obligations shall be the capitalized
     amount thereof, determined in accordance with GAAP.

          "Cash Interest Expense" means, for any Person for any period (without
           ---------------------
     duplication), interest expense net of interest income, whether paid or
     accrued (including the interest component of Capital Lease Obligations), on
     all Debt of such Person for such period, including, without limitation, (a)
     interest expense in respect of the Advances, (b) commissions, discounts and
     other fees and charges payable in connection with letters of credit
     (including, without limitation, any Letter of Credit) and (c) the net
     payment, if any, payable in connection with any Hedge Agreement; excluding,
                                                                      ---------
     in each case, interest not payable in cash (including, without limitation,
     amortization of original issue discount and the interest portion of any
     deferred payment obligation); all as determined in accordance with GAAP for
     such period.
<PAGE>

                                      -7-

          "Casualty Event" means, with respect to any property of any Person,
           --------------
     any loss of or damage to, or any condemnation or other taking of, such
     property for which such Person or any of its Subsidiaries receives
     insurance proceeds, or proceeds of a condemnation award or other
     compensation.

          "CERCLA" means the Comprehensive Environmental Response, Compensation
           ------
     and Liability Act of 1980, as amended.

          "Citibank" means Citibank, N.A., a national banking association.
           --------

          "Collateral" means all "Collateral" referred to in the Security
           ----------
     Documents and all other property that is subject to any Lien created by any
     Security Document in favor of the Collateral Agent.

          "Collateral Agent" means Citibank, in its capacity as Collateral Agent
           ----------------
     for the Secured Parties under and as defined in the Security Documents and
     the Intercreditor Agreement, together with its successors in such capacity.

          "Commitment" has the meaning specified in Section 2.01(a).
           ----------

          "Commitment Amount Reduction" means, for each mandatory Commitment
           ---------------------------
     reduction on any Commitment Reduction Date pursuant to Section 2.04(b), the
     lesser of (i) $12,187,500 and (ii) an amount equal to $20,000,000 minus the
                                                                       -----
     aggregate amount of principal payments or principal prepayments in respect
     of the Advances under the Terra Canada Credit Facility for the Rolling
     Period ending on such Commitment Reduction Date (which amount under this
     clause (ii) shall not be less than zero).

          "Commitment Reduction Dates" shall mean the Quarterly Dates falling on
           --------------------------
     or nearest to June 30 of each year, commencing with June 30, 2000, through
     and including June 30, 2002.

          "Commitment Termination Date" means the earlier of (a) December 31,
           ---------------------------
     2002 (provided that if such day is not a Business Day, the Commitment
           --------
     Termination Date shall be the immediately preceding Business Day), and (b)
     the termination or cancellation of the Commitments pursuant to the terms of
     this Agreement.

          "Confidential Information" means information identified as such that
           ------------------------
     Terra or any of its Subsidiaries furnishes to the Administrative Agent, any
     Issuing Bank or any Lender, but does not include any such information once
     such information has become generally available to the public or once such
     information has become available to the Administrative Agent, any Issuing
     Bank or any Lender from a source other than Terra and its Subsidiaries
     (unless, in either case, such information becomes so available as a
<PAGE>

                                      -8-

     result of the breach by the Administrative Agent, an Issuing Bank or a
     Lender of its duty of confidentiality set forth in Section 9.10).

          "Consolidated" refers to the consolidation of accounts in accordance
           ------------
     with GAAP.

          "Consolidated Group" means, collectively, Terra and its Consolidated
           ------------------
     Subsidiaries, and a "member" of the Consolidated Group means Terra or any
     such Subsidiary.

          "Continuation", "Continue" and "Continued" each refers to a
           ------------    --------       ---------
     continuation of Eurodollar Rate Advances from one Interest Period to the
     next Interest Period pursuant to Section 2.08.

          "Conversion", "Convert" and "Converted" each refers to a conversion of
           ----------    -------       ---------
     Advances of one Type into Advances of the other Type pursuant to Section
     2.08 or 2.09.

          "Covered Transaction" means, collectively:
           -------------------

          (1)  the Transactions (as defined in the Original Credit Agreement) or
     any part thereof, including, without limitation, the Initial Merger and the
     Second Merger referred to therein and any of the other transactions
     contemplated thereby; and

          (2)  the SPU Redemption;

          (3)  the other "Covered Transactions" referred to in the Existing
     Credit Agreement;

          (4)  the transactions contemplated by the sale of the Distribution
     Business pursuant to the Distribution Business Sale Agreement; and

          (5)  the transactions contemplated hereby (including, without
     limitation, the making of Advances and the issuance of Letters of Credit
     hereunder).

          "Cumulative Adjusted Net Income" means, for any period, the sum, for
           ------------------------------
     each complete fiscal year of Terra (beginning with the fiscal year ending
     December 31, 1995) during such period, of the Adjusted Net Income Amounts
     for all such fiscal years.  For purposes of this definition, "Adjusted Net
                                                                   ------------
     Income Amount" means, for any fiscal year of Terra, the greater of (x) 33-
     -------------
     1/3% of the net income of Terra and its Subsidiaries on a Consolidated
     basis during such fiscal year and (y) $20,000,000.

          "Debt" of any Person means (without duplication):  (a) all
           ----
     indebtedness of such Person for borrowed money, (b) all Obligations of such
     Person for the deferred purchase price of property or services (other than
     any trade payable having a tenor of not more than 365 days, or any like
     item arising from the purchase of equipment or services having a tenor of
     not more than 90 days, in each case incurred in the ordinary course of
     business
<PAGE>

                                      -9-

     and on normal business terms and in each case not overdue by more than 30
     days, and other than any Obligations in respect of letters of credit
     supporting any such trade payable or like item), (c) all Obligations of
     such Person evidenced by notes, bonds, debentures or other similar
     instruments, (d) all indebtedness created or arising under any conditional
     sale or other title retention agreement with respect to property acquired
     by such Person (even though the rights and remedies of the seller or lender
     under such agreement in the event of default are limited to repossession or
     sale of such property), (e) all Capital Lease Obligations and Major
     Operating Lease Obligations of such Person, (f) all Obligations, contingent
     or otherwise, of such Person under acceptance, letter of credit or similar
     facilities (other than Obligations in respect of letters of credit referred
     to in clause (b) of this definition), (g) all Obligations of such Person to
     purchase, redeem, retire, defease or otherwise make any payment in respect
     of any Redeemable capital stock, which Obligations shall be valued at the
     greater of its voluntary or involuntary liquidation preference plus accrued
     and unpaid dividends, (h) all Obligations of such Person in respect of
     Hedge Agreements, (i) all Debt of others referred to in clauses (a) through
     (h) above guaranteed directly or indirectly in any manner by such Person,
     or in effect guaranteed directly or indirectly by such Person through an
     agreement (i) to pay or purchase such Debt or to advance or supply funds
     for the payment or purchase of such Debt, (ii) to purchase, sell or lease
     (as lessee or lessor) property, or to purchase or sell services, primarily
     for the purpose of enabling the debtor to make payment of such Debt or to
     assure the holder of such Debt against loss, (iii) to supply funds to or in
     any other manner invest in the debtor (including any agreement to pay for
     property or services irrespective of whether such property is received or
     such services are rendered) or (iv) otherwise to assure a creditor against
     loss, and (j) all Debt referred to in clauses (a) through (i) above secured
     by (or for which the holder of such Debt has an existing right, contingent
     or otherwise, to be secured by) any Lien on property (including, without
     limitation, accounts and contract rights) owned by such Person, even though
     such Person has not assumed or become liable for the payment of such Debt.

          "Debt to Cash Flow Ratio" means, for any period, the ratio of:
           -----------------------

               (1)  Funded Debt of Terra and its Subsidiaries on a Consolidated
          basis as of the last day of such period to

               (2) (x) EBITDA of Terra and its Subsidiaries on a Consolidated
          basis for such period multiplied by (y) the Ramp Up Period Multiplier
          for such period.

          In addition, solely for purposes of Section 5.04, in determining the
     Debt to Cash Flow Ratio on any date or for any period when any Special
     Refinancing Debt is outstanding, Funded Debt and EBITDA shall be determined
     as follows during the period from the date on which such Special
     Refinancing Debt is incurred until the Refinanceable Debt is refinanced or
     replaced in accordance with Section 5.02(b)(1)(xix)(I):
<PAGE>

                                      -10-

               (1)  the Funded Debt component shall be determined excluding
          either such Special Refinancing Debt or the related Refinanceable
          Debt, whichever is lower in aggregate outstanding principal amount
          (the "Excluded Debt"); and
                -------------

               (2)  the EBITDA component shall be determined excluding interest
          expense on such Excluded Debt.

          "Default" means any event that would constitute an Event of Default
           -------
     but for the requirement that notice be given or time elapse or both.

          "Disposition" means any sale, assignment, transfer or other
           -----------
     disposition of any property (whether now owned or hereafter acquired) by
     Terra or any of its Subsidiaries (including, without limitation, the sale
     of the Distribution Business by Terra pursuant to the Distribution Business
     Sale Agreement), but excluding any sale, assignment, transfer or other
     disposition of any property (i) sold or disposed of in the ordinary course
     of business and on ordinary business terms, or (ii) by any Obligor or a
     wholly owned Subsidiary of an Obligor to another Obligor or to a wholly
     owned Subsidiary of an Obligor, or (iii) that consists of outmoded or
     obsolete items, provided that the aggregate value of all such excluded
                     --------
     outmoded or obsolete items with a value of $1,000,000 or more each shall
     not exceed $10,000,000, or (iv) that consists of items no longer necessary
     in the business of Terra or any such Subsidiary, provided that the
                                                      --------
     aggregate value of all such unnecessary items in any fiscal year of Terra
     shall not exceed $250,000.

          "Distribution Business" means the "Business" as defined in the
           ---------------------
     Distribution Business Sale Agreement.

          "Distribution Business Sale Agreement" has the meaning specified in
           ------------------------------------
     the Preliminary Statements to this Agreement.

          "Dividend Payments" means dividends (in cash, property or obligations)
           -----------------
     on, or other payments or distributions on account of, or the setting apart
     of money for a sinking or other analogous fund for, or the purchase,
     redemption, retirement or other acquisition of, any shares of any class of
     stock of the Company or of any warrants, options or other rights to acquire
     the same (or to make any payment to any Person, such as "phantom stock"
     payments, where the amount thereof is calculated with reference to the fair
     market or equity value of Terra, the Company or any of their Subsidiaries,
     other than any such payment made in the ordinary course of business of such
     Person in connection with an executive compensation plan approved by the
     Board of Directors of such Person), but excluding dividends payable solely
     in shares of common stock of the Company.

          "Domestic Lending Office" means, with respect to any Lender, the
           -----------------------
     office of such Lender specified as its "Domestic Lending Office" in its
     Administrative Questionnaire, or such other office of such Lender as such
     Lender may from time to time specify to the Administrative Agent.
<PAGE>

                                      -11-

          "EBITDA" of any Person for any period means the following, determined
           ------
     in accordance with GAAP:  net income (or net loss) plus the sum of (a)
                                                        ----
     interest expense, (b) income tax expense and (c) depreciation expense,
     amortization expense and other non-cash charges deducted in arriving at
     such net income (or loss).

          "Eligible Assignee" means (a) any other Lender or any affiliate of any
           -----------------
     Lender; (b) a commercial bank organized under the laws of the United
     States, or any State thereof, and having total assets in excess of
     $1,000,000,000; (c) a savings and loan association or savings bank
     organized under the laws of the United States, or any State thereof, and
     having a net worth in excess of $100,000,000; (d) a commercial bank
     organized under the laws of any other country that is a member of the OECD
     or has concluded special lending arrangements with the International
     Monetary Fund associated with its General Arrangements to Borrow, or a
     political subdivision of any such country, and having total assets in
     excess of $1,000,000,000, so long as such bank is acting through a branch
     or agency located in the country in which it is organized or another
     country that is described in this clause (d); (e) the central bank of any
     country that is a member of the OECD; (f) a finance company, insurance
     company or other financial institution or fund (whether a corporation,
     partnership, trust or other entity) that is engaged in making, purchasing
     or otherwise investing in commercial loans in the ordinary course of its
     business and having total assets in excess of $100,000,000; and (g) any
     other Person (other than an Affiliate of the Company) approved by the
     Administrative Agent and the Company, such approval of the Company not to
     be unreasonably withheld or delayed.

          "Environmental Action" means any administrative, regulatory or
           --------------------
     judicial suit, demand, demand letter, claim, notice of non-compliance or
     violation, consent order or consent agreement relating in any way to any
     violation of or liability under any Environmental Law or any Environmental
     Permit, including without limitation (a) any claim by any governmental or
     regulatory authority for enforcement, cleanup, removal, response, remedial
     or other actions or damages pursuant to any Environmental Law, (b) any
     claim by any third party seeking damages, contribution, indemnification,
     cost recovery, compensation or injunctive relief resulting from Hazardous
     Materials or arising from alleged injury or threat of injury to the
     environment and (c) any notice by any governmental or regulatory authority
     alleging that Terra or any of its Subsidiaries is or may be responsible
     for, or is a potentially responsible party with respect to, any cleanup,
     removal, response, remedial or other actions or damages pursuant to any
     Environmental Law.

          "Environmental Law" means any federal, state or local governmental
           -----------------
     law, rule, regulation, order, writ, judgment, injunction or decree relating
     to pollution or protection of the environment or the treatment, storage,
     disposal, release, threatened release or handling of Hazardous Materials,
     including, without limitation, CERCLA, the Resource Conservation and
     Recovery Act, the Hazardous Materials Transportation Act, the Clean
<PAGE>

                                      -12-

     Water Act, the Toxic Substances Control Act, the Clean Air Act, the Safe
     Drinking Water Act, the Atomic Energy Act and the Federal Insecticide,
     Fungicide and Rodenticide Act, in each case, as amended from time to time.

          "Environmental Permit" means any permit, approval, identification
           --------------------
     number, license or other authorization required under any Environmental
     Law.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
           -----
     amended from time to time, and the regulations promulgated and rulings
     issued thereunder.

          "ERISA Affiliate" of any Person means any other Person that for
           ---------------
     purposes of Title IV of ERISA is a member of such Person's controlled
     group, or under common control with such Person, within the meaning of
     Sections 414(b), (c), (m) and (o) of the Internal Revenue Code.

          "ERISA Event" with respect to any Person means (a) the occurrence of a
           -----------
     reportable event, within the meaning of Section 4043 of ERISA, with respect
     to any Plan of such Person or any of its ERISA Affiliates unless the 30-day
     notice requirement with respect to such event has been waived pursuant to
     regulations under Section 4043 of ERISA and excluding a reportable event
     under Section 4043(c)(7) of ERISA; (b) the provision by the administrator
     of any Plan of such Person or any of its ERISA Affiliates of a notice of
     intent to terminate such Plan, pursuant to Section 4041(c) of ERISA as a
     distress termination; (c) the cessation of operations at a facility of such
     Person or any of its ERISA Affiliates in the circumstances described in
     Section 4062(e) of ERISA; (d) the withdrawal by such Person or any of its
     ERISA Affiliates from a Multiple Employer Plan during a plan year for which
     it was a substantial employer, as defined in Section 4001(a)(2) of ERISA;
     (e) the satisfaction of the conditions set forth in Sections 302(f)(1)(A)
     and (B) of ERISA to the creation of a lien upon property or rights to
     property of such Person or any ERISA Affiliate for failure to make a
     required payment to a Plan; (f) the adoption of an amendment to a Plan of
     such Person or any of its ERISA Affiliates requiring the provision of
     security to such Plan, pursuant to Section 307 of ERISA; or (g) the
     institution by the PBGC of proceedings to terminate a Plan of such Person
     or any of its ERISA Affiliates, pursuant to Section 4042 of ERISA, or the
     occurrence of any event or condition described in Section 4042 of ERISA
     that constitutes grounds for the termination of, or the appointment of a
     trustee to administer, such Plan.

          "Eurocurrency Liabilities" has the meaning specified in Regulation D
           ------------------------
     of the Board of Governors of the Federal Reserve System, as in effect from
     time to time.

          "Eurodollar Lending Office" means, with respect to any Lender, the
           -------------------------
     office of such Lender specified as its "Eurodollar Lending Office" in its
     Administrative Questionnaire (or, if no such office is specified, its
     Domestic Lending Office), or such other office of such Lender as such
     Lender may from time to time specify to the Administrative Agent.
<PAGE>

                                      -13-

          "Eurodollar Rate" means, for any Interest Period for each Eurodollar
           ---------------
     Rate Advance comprising part of the same Borrowing, an interest rate per
     annum equal to the rate per annum obtained by dividing (a) the average
     (rounded upward to the nearest whole multiple of 1/16 of 1% per annum, if
     such average is not such a multiple) of the rates per annum at which
     deposits in U.S. dollars are offered by the principal office of each of the
     Reference Banks in London, England to prime banks in the London interbank
     market at approximately 5:00 P.M. (London time) two Business Days before
     the first day of such Interest Period in an amount substantially equal to
     such Reference Bank's Eurodollar Rate Advance comprising part of such
     Borrowing (determined without giving effect to any assignments or
     participations by such Reference Bank) and for a period equal to such
     Interest Period by (b) a percentage equal to 100% minus the Eurodollar Rate
                                                       -----
     Reserve Percentage for such Interest Period.  The Eurodollar Rate for each
     Interest Period for each Eurodollar Rate Advance comprising part of the
     same Borrowing shall be determined by the Administrative Agent on the basis
     of applicable rates furnished to and received by the Administrative Agent
     from the Reference Banks two Business Days before the first day of such
     Interest Period, subject, however, to the provisions of Section 2.09.
                      -------  -------

          "Eurodollar Rate Advance" means an Advance that bears interest as
           -----------------------
     provided in Section 2.06(a)(ii).

          "Eurodollar Rate Reserve Percentage" for any Interest Period for each
           ----------------------------------
     Eurodollar Rate Advance comprising part of the same Borrowing means the
     reserve percentage (if any) applicable two Business Days before the first
     day of such Interest Period under regulations issued from time to time by
     the Board of Governors of the Federal Reserve System (or any successor) for
     determining the maximum reserve requirement (including, without limitation,
     any emergency, supplemental or other marginal reserve requirement) for a
     member bank of the Federal Reserve System in New York City with deposits
     exceeding $1,000,000,000 with respect to liabilities or assets consisting
     of or including Eurocurrency Liabilities (or with respect to any other
     category of liabilities that includes deposits by reference to which the
     interest rate on Eurodollar Rate Advances is determined) having a term
     equal to such Interest Period.

          "Events of Default" has the meaning specified in Section 6.01.
           -----------------

          "Excluded Period" means, with respect to any additional amount payable
           ---------------
     under Section 2.09 or 2.13, the period ending 120 days prior to the
     applicable Lender's delivery of a certificate referenced in Section
     2.09(a), 2.09(b) or 2.13(d), as applicable, with respect to such additional
     amount.

          "Excluded Transactions" means, collectively:
           ---------------------
<PAGE>

                                      -14-

          (1)  the purchase, redemption or other acquisition of Senior
     Preference Units pursuant to the SPU Redemption;

          (2)  capital contributions to Subsidiaries of Terra;

          (3)  the purchase of the BMLP Class A Limited Partnership Interest as
     required under Section 3.01(p); and

          (4)  Investments permitted under Sections 5.02(f)(vi) and (xi).

          "Existing Credit Agreement" has the meaning specified in the
           -------------------------
     Preliminary Statements to this Agreement.

          "Federal Funds Rate" means, for any period, a fluctuating interest
           ------------------
     rate per annum equal for each day during such period to the weighted
     average of the rates on overnight Federal funds transactions with members
     of the Federal Reserve System arranged by Federal funds brokers, as
     published for such day (or, if such day is not a Business Day, for the next
     preceding Business Day) by the Federal Reserve Bank of New York, or, if
     such rate is not so published for any day that is a Business Day, the
     average of the quotations for such day for such transactions received by
     the Administrative Agent from three Federal funds brokers of recognized
     standing selected by it.

          "Foreign Subsidiary" means a Subsidiary not organized under the laws
           ------------------
     of the United States of America or any State thereof.

          "Funded Debt" of any Person means, on any date, the sum (determined
           -----------
     without duplication) of:  (a) all Debt of such Person that would be listed
     as long-term debt (including Capital Lease Obligations and Major Operating
     Lease Obligations) of such Person on a balance sheet of such Person
     prepared in accordance with GAAP (including, without limitation, the
     current portion of such Debt), plus (b) the Aggregate Outstanding Exposure
                                    ----
     on such date; provided that:
                   --------

               (1)  the term "Funded Debt" shall include letters of credit
          issued in connection with the insurance program of Terra and its
          Subsidiaries only to the extent of unreimbursed drawings thereunder;
          and

               (2)  the term "Funded Debt" shall not include Obligations under
          Hedge Agreements.

     For all purposes of this Agreement, "Funded Debt" shall not include
     Guarantees by Terra U.K. of Terra U.K. Customer Debt and Guarantees by TI
     of Terra Customer Debt.
<PAGE>

                                      -15-

          "GAAP" means generally accepted accounting principles in the United
           ----
     States of America as in effect as of the date of, and used in, the
     preparation of the audited financial statements referred to in Section
     4.01(f).

          "Guarantee" by any Person means any arrangement by which such Person
           ---------
     incurs Debt of the types referred to in clauses (i) and (j) of the
     definition of "Debt" in respect of such Person.

          "Guaranteed Obligations" has the meaning specified in Section 8.01.
           ----------------------

          "Guarantors" means, collectively, (x) Terra, Terra Capital Holdings,
           ----------
     TNC, TI, BMCH, Beaumont Holdings, TMC, BMLP, Port Neal Corporation, Terra
     Oklahoma, Terra U.K. Holdings and BAI and (y) from and after the SPU
     Redemption Time, TNLP and its successors.

          "Hazardous Materials" means (a) petroleum or petroleum products,
           -------------------
     natural or synthetic gas, asbestos in any form that is or could become
     friable, and radon gas, (b) any substances defined as or included in the
     definition of "hazardous substances", "hazardous wastes", "hazardous
     materials", "extremely hazardous wastes", "restricted hazardous wastes",
     "toxic substances", "toxic pollutants", "contaminants" or "pollutants", or
     words of similar meaning and regulatory effect, under any Environmental Law
     and (c) any other substance exposure to which is regulated under any
     Environmental Law.

          "Hedge Agreements" means interest rate swap, cap or collar agreements,
           ----------------
     interest rate future or option contracts, currency swap agreements,
     currency future or option contracts, commodity future or option agreements
     and other similar agreements designed to hedge against fluctuations in
     interest rates, foreign exchange rates or commodity prices, including,
     without limitation, the Ammonium Nitrate Hedging Agreement.

          "Holdings Pledge Agreement" means an Amended and Restated Pledge
           -------------------------
     Agreement in substantially the form attached hereto as Exhibit B-1 between
     Terra Capital Holdings and the Collateral Agent, as amended from time to
     time.

          "ICI" means, collectively, ICI Chemicals & Polymers Limited and
           ---
     Imperial Chemical Industries Plc.

          "Immaterial Subsidiary" means, as of any date of determination, any
           ---------------------
     Subsidiary of Terra with not more than $500,000 of assets on such date nor
     more than $100,000 of gross income for the fiscal year of Terra ended on or
     most recently ended prior to such date.

          "Indemnified Party" has the meaning specified in Section 9.04(b).
           -----------------
<PAGE>

                                      -16-

          "Initial Lenders" has the meaning specified in the recital of the
           ---------------
     parties to this Agreement.

          "Insufficiency" means, with respect to any Plan at any time, the
           -------------
     amount, if any, by which the "accumulated benefit obligation" (as defined
     in Statement of Financial Accounting Standards 87) exceeds the fair market
     value of the assets of such Plan as of the date of the most recent
     actuarial valuation for such Plan, calculated using the actuarial methods,
     factors and assumptions used in such valuation.

          "Intercompany Debt" means Debt owed by Terra or one of its
           -----------------
     Subsidiaries to Terra or one of its Subsidiaries.

          "Intercompany Receivables Facility" means a facility entered into by
           ---------------------------------
     the Company and/or any of its Subsidiaries, as sellers, and one or more
     Receivables Subsidiaries, as purchasers, providing for the sale of
     Receivables by said sellers to said purchasers.

          "Intercreditor Agreement" means the Collateral Agency and
           -----------------------
     Intercreditor Agreement attached as Exhibit G among the Company, certain of
     the other Obligors, the Collateral Agent, the Administrative Agent and the
     other Secured Parties referred to therein (or representatives on their
     behalf), as amended from time to time.

          "Interest Coverage Ratio" means, for any period, the ratio of:
           -----------------------

               (1) EBITDA of Terra and its Subsidiaries on a Consolidated basis
          for such period to

               (2) Cash Interest Expense of Terra and its Subsidiaries on a
          Consolidated basis for such period.

          In addition, solely for purposes of Section 5.04, in determining the
     Interest Coverage Ratio on any date or for any period when any Special
     Refinancing Debt is outstanding, EBITDA and Cash Interest Expense shall be
     determined as follows during the period from the date on which such Special
     Refinancing Debt is incurred until the Refinanceable Debt is refinanced or
     replaced in accordance with Section 5.02(b)(1)(xix)(I):

               (1)  the EBITDA component shall be determined excluding interest
          expense on either such Special Refinancing Debt or the related
          Refinanceable Debt, whichever is lower in aggregate outstanding
          principal amount (the "Excluded Debt"); and
                                 -------------

               (2)  the Cash Interest Expense component shall be determined
          excluding interest expense on such Excluded Debt.
<PAGE>

                                      -17-

          "Interest Period" means, for each Eurodollar Rate Advance comprising
           ---------------
     part of the same Borrowing, the period commencing on the date of such
     Eurodollar Rate Advance or the date of the Conversion of any Base Rate
     Advance into such Eurodollar Rate Advance, and ending on the last day of
     the period selected by the Borrower pursuant to the provisions below and,
     thereafter, each subsequent period commencing on the last day of the
     immediately preceding Interest Period and ending on the last day of the
     period selected by the Borrower pursuant to the provisions below.  The
     duration of each such Interest Period shall be one, two, three or six
     months, as the Borrower may, upon notice received by the Administrative
     Agent not later than 10:00 A.M. (New York City time) on the second Business
     Day prior to the first day of such Interest Period, select; provided that:
                                                                 --------

               (a)  the Company may not select any Interest Period that ends
          after any Commitment Reduction Date unless, after giving effect
          thereto, the aggregate principal amount of Advances having Interest
          Periods that end after such Commitment Reduction Date shall be equal
          to or less than the aggregate principal amount of Advances scheduled
          to be outstanding after giving effect to the payments of principal
          required to be made on such Commitment Reduction Date;

               (b)  no Interest Period for any Advance may end after the
          Commitment Termination Date;

               (c)  whenever the last day of any Interest Period would otherwise
          occur on a day other than a Business Day, the last day of such
          Interest Period shall be extended to occur on the next succeeding
          Business Day, provided that, if such extension would cause the last
                        --------
          day of such Interest Period to occur in the next following calendar
          month, the last day of such Interest Period shall occur on the next
          preceding Business Day; and

               (d)  whenever the first day of any Interest Period occurs on the
          last day of a calendar month (or on any day for which there is no
          numerically corresponding day in the appropriate subsequent calendar
          month), such Interest Period shall end on the last Business Day of the
          appropriate subsequent calendar month.

          "Internal Revenue Code" means the Internal Revenue Code of 1986, as
           ---------------------
     amended from time to time, and the regulations promulgated and rulings
     issued thereunder.

          "Investment" in any Person means any loan or advance to such Person,
           ----------
     any purchase or other acquisition of any capital stock, warrants, rights,
     options, obligations or other securities of such Person, any capital
     contribution to such Person or any other investment in such Person,
     including, without limitation, (a) any arrangement pursuant to which the
     investor Guarantees Debt of another Person, (b) the acquisition of all or
     substantially all of the assets of such Person or of any division of such
     Person, and
<PAGE>

                                      -18-

     (c) any merger of or consolidation with such Person; provided that the
                                                          --------
     purchase of equipment, fixed assets, real property or improvements from
     such Person do not constitute Investments in such Person to the extent the
     same constitute Capital Expenditures.

          "Issuing Bank" means each Lender specified on the signature pages
           ------------
     hereof as an "Issuing Bank", together with its successors in such capacity,
     provided that with respect to NationsBank, N.A. and its successors it shall
     --------
     be an Issuing Bank only with respect to the NationsBank L/C's.

          "L/C Cash Collateral Account" means, collectively, one or more cash
           ---------------------------
     collateral accounts maintained by the Administrative Agent with Citibank
     for the benefit of the Lenders and Issuing Banks.

          "L/C Related Documents" has the meaning specified in Section 2.13(e).
           ---------------------

          "Lenders" means the Initial Lenders listed on the signature pages
           -------
     hereof and each Eligible Assignee that shall become a party hereto pursuant
     to Section 9.07.

          "Letter of Credit" means a letter of credit issued by an Issuing Bank
           ----------------
     for account of the Company or any of its Subsidiaries pursuant to Section
     2.13(a).

          "Letter of Credit Commitment" means, with respect to any Issuing Bank
           ---------------------------
     at any time, the amount set forth opposite such Issuing Bank's name on
     Schedule 2.01 under the caption "Letter of Credit Commitment", as such
     amount may be reduced pursuant to Section 2.04.

          "Letter of Credit Liability" means, as of any date of determination,
           --------------------------
     all of the liabilities of the Company to the Issuing Banks in respect of
     Letters of Credit, whether any such liability is contingent or fixed, and
     shall consist of the sum of (a) the aggregate Available Amount of all
     Letters of Credit then outstanding, plus (b) the aggregate amount that has
                                         ----
     then been paid by, and has not been reimbursed to, any Issuing Bank under
     Letters of Credit.

          "Letter of Credit Sublimit" means, at any time, the lesser of (i)
           -------------------------
     $45,000,000 and (ii) the aggregate amount of the Commitments hereunder at
     such time.

          "Letters of Credit" has the meaning specified in Section 2.13(a).
           -----------------

          "Lien" means any lien, security interest or other charge or
           ----
     encumbrance of any kind, or any other type of preferential arrangement,
     including, without limitation, the lien or retained security title of a
     conditional vendor and any easement, right of way or other encumbrance on
     title to real property.
<PAGE>

                                      -19-

          "Liquid Asset Coverage Amount" means, at any date, the aggregate
           ----------------------------
     amount of Receivables and inventory of the members of the Consolidated
     Group (determined on a Consolidated basis in accordance with GAAP) on such
     date (as determined reasonably and in good faith by Terra); provided that
                                                                 --------
     (x) all Receivables not payable in Dollars or in any other freely
     convertible currency shall be excluded and (y) all inventory not located
     within the United States of America, Canada and the United Kingdom shall be
     excluded.

          "Liquid Asset Coverage Certificate" means a certificate of the Senior
           ---------------------------------
     Financial Officer, substantially in the form of Exhibit H and appropriately
     completed (which amounts therein, in the case of the Liquid Asset Coverage
     Certificate delivered pursuant to Section 3.01(s), shall be determined
     reasonably and in good faith by Terra).

          "Liquid Asset Coverage Date" means a date as of which the Interest
           --------------------------
     Coverage Ratio is less than 2.00 to 1.00.

          "Loan Documents" means, collectively, this Agreement, the Notes, the
           --------------
     Security Documents and the Loan Purchase Agreement.

          "Loan Purchase Agreement" means an Amended and Restated Loan Purchase
           -----------------------
     Agreement attached as Exhibit E-1 between the Administrative Agent and
     Terra, as modified by the Confirmation of Loan Purchase Agreement in
     substantially the form of Exhibit E and as further amended from time to
     time.

          "Major Operating Lease Obligations" means, for any Person, all
           ---------------------------------
     obligations of such Person under an operating lease to pay required
     termination payments or like payments in an amount exceeding $7,000,000 and
     in an amount at least equal to 75% of the original acquisition cost of the
     leased property under such operating lease.

          "Management Agreements" means one or more management agreements
           ---------------------
     between Terra and/or certain of its Subsidiaries and other Persons
     providing for the performance by Terra or any of such Subsidiaries of
     certain treasury, purchasing, legal and/or other services for its
     Subsidiaries and such other Persons, as such agreements are in effect from
     time to time.

          "Margin Stock" has the meaning specified in Regulations U and X.
           ------------

          "Material Adverse Change" means, with respect to any Person, any
           -----------------------
     material adverse change in the business, assets, operations, properties or
     financial condition of such Person and its Subsidiaries taken as a whole,
     or any material adverse change in the contingent liabilities of such Person
     which could reasonably be expected to result in any of the foregoing, other
     than any of the foregoing resulting solely from (i) a general economic
     change in the industry of such Person and its Subsidiaries or (ii) the sale
     by Terra of the Distribution Business on the terms and conditions as set
     forth in the Distribution Business Sale Agreement.
<PAGE>

                                      -20-

          "Material Adverse Effect" means a material adverse effect on (a) the
           -----------------------
     business, assets, operations, properties or financial condition of Terra
     and its Subsidiaries taken as a whole, or a material adverse effect on the
     contingent liabilities of such Person which could reasonably be expected to
     result in any of the foregoing (other than any of the foregoing resulting
     solely from the sale by Terra of the Distribution Business on the terms and
     conditions as set forth in the Distribution Business Sale Agreement), (b)
     the rights and remedies of the Administrative Agent, any Issuing Bank or
     any Lender under any Loan Document or (c) the ability of any Obligor to
     perform its Obligations under any Loan Document to which it is or is to be
     a party.

          "Material Contract" means:
           -----------------

               (A)  each Hedge Agreement;

               (B)  each contract to which Terra or any of its Subsidiaries is a
          party (a "Specified Party") that (a) provides for the provision of
                    ---------------
          goods or services by the Specified Party or the receipt of goods or
          services by the Specified Party, (b) has a term of more than one year
          (unless such contract may be cancelled at the sole option of another
          Person party to such contract), (c) involves the payment or receipt by
          the Specified Party of consideration having a fair market value in
          excess of $1,000,000 in any fiscal year of Terra and (d) provides for
          either: (i) the provision of goods or services to another Person that
          is obligated to purchase from the Specified Party a specified quantity
          of such goods or services (but only to the extent that, if such other
          Person did not purchase such quantity of such goods or services, the
          Specified Party would not be readily able to sell such goods or
          services at a price equal to or higher than the price set in such
          contract) or (ii) the receipt of goods or services from another Person
          that is obligated to supply to the Specified Party a specified
          quantity of such goods or services (but only to the extent that, if
          such other Person did not supply such quantity of such goods or
          services, the Specified Party would not be readily able to purchase
          such goods or services at a price less than or equal to the price set
          in such contract); and

               (C)  each contract to which Terra or any of its Subsidiaries is a
          party that, if such contract were to be terminated or the obligations
          of any other Person party to such contract were to fail to be in full
          force and effect, could reasonably be expected, either individually or
          in the aggregate with any other such event, to have a Material Adverse
          Effect.

          "Material Subsidiary" means any Subsidiary of Terra other than an
           -------------------
     Immaterial Subsidiary.

          "Minorco" means Minorco, S.A., a Luxembourg societe anonyme, and its
           -------
     successors.
<PAGE>

                                      -21-

          "Moody's" means Moody's Investors Service, Inc. and its successors.
           -------

          "Mortgages" means, collectively, the Terra Oklahoma Mortgage, the BMLP
           ---------
     Mortgage and the Port Neal Corporation Mortgage and each other Mortgage
     covering real and other property of one or more of the Obligors as may be
     executed and delivered in accordance with the terms and conditions set
     forth herein.

          "Multiemployer Plan" of any Person means a multiemployer plan, as
           ------------------
     defined in Section 4001(a)(3) of ERISA, to which such Person or any of its
     ERISA Affiliates is making or accruing an obligation to make contributions,
     or has within any of the preceding five plan years made or accrued an
     obligation to make contributions.

          "Multiple Employer Plan" of any Person means a single employer plan,
           ----------------------
     as defined in Section 4001(a)(15) of ERISA, that (a) is maintained for
     employees of such Person or any of its ERISA Affiliates and at least one
     Person other than such Person and its ERISA Affiliates or (b) was so
     maintained and in respect of which such Person or any of its ERISA
     Affiliates has or would have liability under Section 4064 or 4069 of ERISA
     in the event such plan has been or were to be terminated.

          "NationsBank L/C's" means the Letters of Credit identified on Schedule
           -----------------
     1.

          "Net Available Proceeds" means:
           ----------------------

               (a)  in the case of any Disposition, the aggregate amount of all
          cash payments, and the fair market value of any non-cash
          consideration, received by Terra and its Subsidiaries directly or
          indirectly in connection with such Disposition; provided that (i) such
                                                          --------
          Net Available Proceeds shall be net of (x) the amount of any legal,
          title and recording tax expenses, commissions and other reasonable
          fees and expenses (including reasonable expenses of preparing the
          relevant property for sale) paid by Terra and its Subsidiaries in
          connection with such Disposition and (y) any Federal, state and local
          income or other taxes estimated in good faith to be payable by Terra
          and its Subsidiaries as a result of such Disposition and (ii) such Net
          Available Proceeds shall be net of any repayments by Terra or any of
          its Subsidiaries of Debt to the extent that (x) such Debt is secured
          by a Lien on the property that is the subject of such Disposition and
          (y) the transferee of (or holder of a Lien on) such property requires
          that such Debt be repaid as a condition to the purchase of such
          property; and

               (b)  in the case of any Casualty Event, the aggregate amount of
          proceeds of insurance, condemnation awards and other compensation
          received by Terra and its Subsidiaries (and, in the case of business
          interruption insurance, not contractually required to be paid over to
          Morgan Stanley Leveraged Equity Fund II, as agent, or its successors
          or assigns) in respect of such Casualty Event net of
<PAGE>

                                      -22-

          (A) reasonable expenses incurred by Terra and its Subsidiaries in
          connection therewith, (B) contractually required repayments of Debt to
          the extent secured by a Lien on the property suffering such Casualty
          Event and any income and transfer taxes payable by Terra or any of its
          Subsidiaries in respect of such Casualty Event and (C) amounts
          promptly applied to or set aside for the repair or replacement of the
          property suffering such Casualty Event; provided that the proceeds of
                                                  --------
          insurance received by Terra and its Subsidiaries in connection with
          the December 13, 1994 Casualty Event at the Port Neal Facility shall
          be deemed to be applied to the repair or replacement of the Port Neal
          Facility.

          "Net Worth" means, for any Person at any time, the sum of the
           ---------
     following for such Person and its Subsidiaries on a Consolidated basis:

               (a)  the amount of capital stock; plus
                                                 ----

               (b)  the amount of surplus and retained earnings (or, in the case
          of a surplus or retained earnings deficit, minus the amount of such
                                                     -----
          deficit).

          "1995 Terra Debt" means Debt incurred by Terra under the 1995 Terra
           ---------------
     Debt Indenture.

          "1995 Terra Debt Indenture" means the Indenture dated as of June 22,
           -------------------------
     1995 between Terra and First Trust National Association, as Trustee,
     providing for the issuance of Terra's 10.50% Senior Notes, as from time to
     time amended.

          "Note" means a promissory note of the Company payable to the order of
           ----
     a Lender, in substantially the form of Exhibit A, as from time to time
     amended.

          "Notice of Borrowing" has the meaning specified in Section 2.02(a).
           -------------------

          "Notice of Issuance" has the meaning specified in Section 2.13(b)(i).
           ------------------

          "Obligation" means, with respect to any Person, any obligation of such
           ----------
     Person of any kind, including, without limitation, any liability of such
     Person on any claim, whether or not the right of any creditor to payment in
     respect of such claim is reduced to judgment, liquidated, unliquidated,
     fixed, contingent, matured, disputed, undisputed, legal, equitable, secured
     or unsecured, and whether or not such claim is discharged, stayed or
     otherwise affected by any proceeding referred to in Section 6.01(g).
     Without limiting the generality of the foregoing, the Obligations of the
     Obligors under the Loan Documents include (a) their respective obligations
     to pay principal, interest, Letter of Credit commissions, charges,
     expenses, fees, attorneys' fees and disbursements, indemnities and other
     amounts payable under any Loan Document and (b) their respective
     obligations to reimburse any amount in respect of any of the foregoing that
     any Lender, in its sole discretion, may elect to pay or advance on behalf
     of such Obligor.
<PAGE>

                                      -23-

          "Obligors" means the Guarantors and the Company.
           --------

          "OECD" means the Organization for Economic Cooperation and
           ----
     Development.

          "Original Credit Agreement" means the Credit Agreement dated as of
           -------------------------
     October 24, 1994 among the Company, Terra and TNLP, as borrowers, certain
     Guarantors, the "Lenders" and "Issuing Banks" referred to therein and
     Citibank, as Agent.

          "Other Distribution" means a Dividend Payment made with respect to the
           ------------------
     capital stock of the Company except to the extent that the Company
     determines, reasonably and in good faith, that such Dividend Payment (1) is
     made to fund one or more of the items described in the definition of
     "Specified Payments" in this Section 1.01 or (2) is made out of the then-
     available amount of Cumulative Adjusted Net Income.

          "Other Taxes" has the meaning specified in Section 2.11(b).
           -----------

          "Outside Subsidiary" means any Subsidiary of Terra (other than Terra
           ------------------
     Capital Holdings or any of its Subsidiaries).

          "PBGC" means the Pension Benefit Guaranty Corporation.
           ----

          "Permitted Investments" means:
           ---------------------

          (a)  direct obligations of the United States of America, or of any
     agency thereof, or obligations guaranteed as to principal and interest by
     the United States of America, or by any agency thereof, in either case
     maturing not more than one year from the date of acquisition thereof;

          (b)  readily marketable direct obligations of the United States of
     America, or of any agency thereof, or readily marketable obligations
     guaranteed as to principal and interest by the United States of America, or
     by any agency thereof, in either case maturing not more than one year from
     the date of acquisition thereof;

          (c)  readily marketable direct obligations issued by any State of the
     United States of America or any political subdivision thereof or of the
     government of Canada or the United Kingdom or any agency thereof, in each
     case maturing not more than one year from the date of acquisition thereof
     and having the highest credit rating obtainable from either of Moody's or
     Standard & Poor's;

          (d)  money market mutual funds (including, without limitation, tax-
     free money market mutual funds) with assets consisting solely of U.S.
     Dollars and securities principally of the types described in paragraphs
     (a), (b) and (c) in this definition;
<PAGE>

                                      -24-

          (e)  certificates of deposit issued by, repurchase and reverse
     repurchase agreements with, banker's acceptances of, and eurodollar time
     deposits with, any Initial Lender or any bank or trust company organized
     under the laws of the United States of America or any state thereof, having
     capital, surplus and undivided profits of at least $500,000,000 (or any
     national or regional brokerage firm) and whose unsecured, unguaranteed
     long-term senior debt obligations are rated at least A by Standard & Poor's
     and at least A2 by Moody's, maturing not more than 270 days from the date
     of acquisition thereof;

          (f)  obligations of not more than $100,000 in the aggregate at any one
     time of any bank or bank holding company with a capital and surplus of less
     than $500,000,000 or whose unsecured, unguaranteed long-term senior debt
     obligations are rated less than A by Standard & Poor's or less than A2 by
     Moody's;

          (g)  commercial paper and variable rate demand notes, in each case
     rated at least A-1 by Standard & Poor's or at least P-1 by Moody's and
     maturing not more than 270 days from the date of acquisition thereof;

          (h)  tax-exempt auction rate preferred stock and taxable and tax-
     exempt auction rate securities, in each case rated at least AAA by Standard
     & Poor's and Aaa by Moody's and maturing not more than 60 days from the
     date of acquisition thereof;

          (i)  "Liquidity Optimized Guaranteed Investment Contracts" with
     insurance companies having short-term debt ratings of at least A-1 by
     Standard & Poor's and P-1 by Moody's and maturing not more than 30 days
     from the date of acquisition thereof;

          (j)  Canadian dollar-denominated banker's acceptances of Canadian
     banks rated at least R1-mid by Dominion Bond Rating Service ("Dominion")
                                                                   --------
     and maturing not more than one year from the date of acquisition thereof;
     and

          (k)  Canadian dollar-denominated commercial paper rated at least R1-
     mid by Dominion and maturing not more than one year from the date of
     acquisition thereof; and

          (l)  solely with respect to Terra U.K., (i) British government bonds
     maturing not more than one year from the date of acquisition thereof; (ii)
     money-market funds or composite funds with assets consisting solely of
     Pounds Sterling, high-quality short-term corporate securities and
     securities principally of the type described in clause (i) in this
     paragraph (l); and (iii) funds held in corporate accounts at banks
     organized under the laws of the United Kingdom having capital, surplus and
     undivided profits not less than $350,000,000 or at branches of U.S. banks
     located in the United Kingdom of the quality described in paragraph (e)
     above.

          "Permitted Liens" means such of the following as to which no
           ---------------
     enforcement, collection, execution, levy or foreclosure proceeding shall
     have been commenced (or, if
<PAGE>

                                      -25-

     such a proceeding has been commenced, such proceeding is being contested in
     good faith by appropriate proceedings and enforcement of any Lien has been
     and is stayed):

               (a) Liens for taxes, assessments and governmental charges or
          levies to the extent not required to be paid under Section 5.01(b),

               (b) Liens imposed by law, such as materialmen's, mechanics',
          carriers', workmen's and repairmen's Liens, statutory landlord's Liens
          and other similar Liens arising in the ordinary course of business
          securing obligations that are not overdue for a period of more than 30
          days or which are being contested in good faith and by appropriate
          proceedings,

               (c) pledges or deposits to secure obligations under workers'
          compensation laws or similar legislation or to secure public or
          statutory obligations,

               (d) deposits to secure the performance of bids, trade contracts
          (other than for borrowed money), leases (other than capital leases),
          surety and appeal bonds, and performance bonds and other obligations
          of a like nature incurred, in each case arising in the ordinary course
          of business,

               (e)  as to any particular property at any time, such easements,
          encroachments, covenants, rights of way, minor defects, irregularities
          or encumbrances on title which do not materially impair the use of
          such property for the purpose for which it is held by the owner
          thereof,

               (f)  municipal and zoning ordinances that are not violated in any
          material respect by the existing improvements and the present use made
          by the owner thereof, and

               (g)  real estate taxes and assessments not yet delinquent.

          "Person" means an individual, partnership, corporation (including a
           ------
     business trust), joint stock company, limited liability company, trust,
     unincorporated association, joint venture or other entity, or a government
     or any political subdivision or agency thereof.

          "Plan" means a Single Employer Plan or a Multiple Employer Plan.
           ----

          "Port Neal Facility" means TI's facility in Port Neal, Iowa.
           ------------------

          "Port Neal Corporation" means Port Neal Corporation, a Delaware
           ---------------------
     corporation and a wholly owned Subsidiary of TI.
<PAGE>

                                      -26-

          "Port Neal Corporation Mortgage" means a Mortgage, Assignment of
           ------------------------------
     Rents, Security Agreement and Fixture Filing in substantially the form
     attached hereto as Exhibit B-5 between Port Neal Corporation and the
     Collateral Agent, as amended from time to time.

          "Post-Default Rate" means a rate per annum equal to 2% plus the
           -----------------                                     ----
     Applicable Margin plus the Base Rate as in effect from time to time.
                       ----

          "Pounds Sterling" and "(Pounds)" means lawful money of the United
           ---------------
     Kingdom.

          "Preferred Stock" means, with respect to any corporation, capital
           ---------------
     stock issued by such corporation that is entitled to a preference or
     priority over any other capital stock issued by such corporation upon any
     distribution of such corporation's assets, whether by dividend or upon
     liquidation.

          "Pro Rata Share" of any amount means, with respect to any Lender at
           --------------
     any time, the product of (a) a fraction the numerator of which is the
     amount of such Lender's Advances hereunder (or, prior to the Commitment
     Termination Date, the amount of such Lender's Commitment), and the
     denominator of which is the aggregate Advances or Commitments, as the case
     may be, hereunder at such time, multiplied by (b) such amount.
                                     -------------

          "Purchase Event" means:
           --------------

               (1)  that during any period commencing January 1, 1995, the
          aggregate amount of Dividend Payments with respect to the capital
          stock of the Company during such period exceeds the sum of:

                    (a) the aggregate amount of Specified Payments for such
               period plus
                      ----

                    (b) Cumulative Adjusted Net Income for such period plus
                                                                       ----

                    (c) the amounts available during such period for Restricted
               Transactions under Section 5.02(h) (provided that this clause (c)
                                                   --------
               shall be determined, with respect to all periods prior to the
               Restatement Date, as provided in the Existing Credit Agreement)
               to the extent not utilized for Restricted Transactions during
               such period; or

               (2)  that:

               (A)  Liens on or with respect to any property of the Company or
          any of its Subsidiaries have been created in favor of Terra or any of
          its Subsidiaries, other than Liens permitted under any of clauses (i)
          through (xviii) of Section 5.02(a); or
<PAGE>

                                      -27-

               (B)  the Company or any of its Subsidiaries has any outstanding
          Debt owing to Terra or any of its Subsidiaries, other than Debt
          permitted to be outstanding under any of clauses (i) through (vii) of
          Section 5.02(b)(2); or

               (C)  the Company or any of its Subsidiaries has sold, transferred
          or otherwise disposed of any of its property to Terra or any of its
          Subsidiaries, other than sales, transfers or other dispositions
          permitted under any of clauses (i) through (ix) of Section 5.02(e); or

               (D)  the Company or any of its Subsidiaries has made any
          Investments in Terra or any of its Subsidiaries, other than
          Investments permitted under any of clauses (i) through (xv) of Section
          5.02(f).

          "Quarterly Dates" means March 31, June 30, September 30 and December
           ---------------
     31 in each year, the first of which shall be the first such day after the
     Restatement Date, provided that, if any such day is not a Business Day, the
                       --------
     relevant Quarterly Date shall be the immediately preceding Business Day.

          "Ramp Up Period Multiplier" means, for any period, (x) four divided by
           -------------------------
     (y) the number of fiscal quarters of Terra that both begin and end during
     such period.

          "Receivables" means accounts and notes receivable and, in each case,
           -----------
     related reserves.

          "Receivables Facilities" means, collectively, (i) the August 1996
           ----------------------
     Receivables Purchase Agreement among Terra Funding Corporation, as Seller,
     the Company, as initial servicer, the financial institutions party thereto,
     as Purchasers, and Bank of America National Trust and Savings Association,
     as Agent and (ii) the Receivables Purchase Agreement dated as of March 31,
     1994 among TI, as Seller, the financial institutions party thereto, as
     Purchasers, and Bank of America National Trust and Savings Association,
     successor to Continental Bank N.A., as agent, as from time to time amended.

          "Receivables Subsidiary" means a Subsidiary of the Company that meets
           ----------------------
     both of the following criteria:

               (1)  such Subsidiary is formed solely for the purpose of, and is
          engaged solely in the business of, (x) purchasing Receivables of the
          Company and one or more of its Subsidiaries under an Intercompany
          Receivables Facility and/or (y) owning the capital stock of, or other
          ownership interests in, one or more Receivables Subsidiaries; and
<PAGE>

                                      -28-

               (2)  all of the capital stock of and/or other ownership interests
          in, such Subsidiary is owned beneficially and of record, directly or
          indirectly, by Terra Capital Holdings, the Company and/or one or more
          other Receivables Subsidiaries.

          "Redeemable" means any capital stock, Debt or other right or
           ----------
     Obligation that (a) the issuer thereof has undertaken to redeem at a fixed
     or determinable date or dates prior to the Commitment Termination Date
     hereunder, whether by operation of a sinking fund or otherwise, or upon the
     occurrence of a condition not solely within the control of the issuer or
     (b) is redeemable on any date prior to the Commitment Termination Date at
     the option of the holder thereof.  For purposes of this Agreement, the BMLP
     Class A Limited Partnership Interest shall not be deemed to be
     "Redeemable".

          "Reference Banks" means Citibank, NationsBank, N.A. and The Bank of
           ---------------
     Nova Scotia (or their respective Applicable Lending Offices, as the case
     may be).

          "Refinanceable Debt" has the meaning assigned to such term in Section
           ------------------
     5.02(b)(1)(xix)(I).

          "Register" has the meaning specified in Section 9.07(c).
           --------

          "Regulation U" and "Regulation X" mean Regulations U and X of the
           ------------       ------------
     Board of Governors of the Federal Reserve System, respectively, as in
     effect from time to time.

          "Required Lenders" means at any time Lenders owed or holding in the
           ----------------
     aggregate at least 51% of the sum of the then aggregate unpaid principal
     amount of the Advances, the then aggregate Unused Commitments and the
     aggregate Available Amount of all Letters of Credit.  For purposes of this
     definition, the Available Amount of each Letter of Credit shall be
     considered to be owed to the Lenders according to their respective Pro Rata
     Shares.

          "Restatement Date" has the meaning assigned to such term in Section
           ----------------
     3.01.

          "Restricted Transactions" means, collectively, Capital Expenditures
           -----------------------
     and Specified Acquisitions.

          "Rolling Period" means (i) for the fiscal quarter of Terra ending in
           --------------
     June 1999, such fiscal quarter, (ii) for the fiscal quarter of Terra ending
     in September 1999, such fiscal quarter and the prior fiscal quarter of
     Terra, (iii) for the fiscal quarter of Terra ending in December 1999, such
     fiscal quarter and the prior two fiscal quarters of Terra and (iv)
     thereafter, any period of four consecutive fiscal quarters of Terra.

          "Security Documents" means the Holdings Pledge Agreement, the Terra
           ------------------
     Capital Pledge and Security Agreement, the Subsidiary Pledge and Security
     Agreement, the
<PAGE>

                                      -29-

     TNLP Pledge and Security Agreement, the Mortgages, each security agreement
     or other grant of security now or hereafter made by any Obligor to secure
     any of the Obligations hereunder and under the other Loan Documents, and
     all Uniform Commercial Code financing statements required by this Agreement
     or any of the foregoing to be filed with respect to the security interests
     in real or personal property created pursuant thereto.

          "Senior Financial Officer" means the Chief Financial Officer of Terra.
           ------------------------

          "Senior Preference Units" means, collectively, (a) the "Senior
           -----------------------
     Preference Units" issued and outstanding under, and as defined in, the
     Agreement of Limited Partnership dated as of December 4, 1991 of TNCLP, as
     such Agreement of Limited Partnership is in effect on the Restatement Date,
     and (b) the "Common Units" into which such Senior Preference Units have
     been converted in accordance with Section 5.5 of such Agreement of Limited
     Partnership.

          "Single Employer Plan" of any Person means a single employer plan, as
           --------------------
     defined in Section 4001(a)(15) of ERISA, that is subject to Title IV of
     ERISA and that (a) is maintained for employees or former employees of such
     Person or any of its ERISA Affiliates and no Person other than such Person
     and its ERISA Affiliates or (b) was so maintained and in respect of which
     such Person or any of its ERISA Affiliates has or would have liability
     under Section 4069 of ERISA in the event such plan has been or were to be
     terminated.

          "Solvent" and "Solvency" mean, with respect to any Person on a
           -------       --------
     particular date, that on such date (a) the fair value of the property of
     such Person is greater than the total amount of liabilities, including,
     without limitation, contingent liabilities, of such Person, (b) the present
     fair salable value of the assets of such Person is not less than the amount
     that will be required to pay the probable liability of such Person on its
     debts as they become absolute and matured, (c) such Person does not intend
     to, and does not believe that it will, incur debts or liabilities beyond
     such Person's ability to pay as such debts and liabilities mature and (d)
     such Person is not engaged in business or a transaction, and is not about
     to engage in business or a transaction, for which such Person's property
     would constitute an unreasonably small capital.

          "Special Refinancing Debt" has the meaning assigned to such term in
           ------------------------
     Section 5.02(b)(1)(xix).

          "Specified Acquisitions" means Investments (including, without
           ----------------------
     limitation, Investments arising by reason of any merger or consolidation
     permitted under Sections 5.02(d)(i)(y) and 5.02(d)(ii)(y), but excluding
     the Excluded Transactions) consisting of acquisitions of ownership
     interests in one or more entities engaged in the same or allied line or
     lines of business as Terra and its Subsidiaries, taken as a whole.

          "Specified Group" has the meaning specified in Section 5.02(e)(iii).
           ---------------
<PAGE>

                                      -30-

          "Specified Payments" means, for any period, (a) all interest due and
           ------------------
     payable on the AMCI Senior Notes and on the 1995 Terra Debt during such
     period, (b) all scheduled dividends payable during such period on
     convertible Preferred Stock or other equity securities issued and the
     proceeds of which were applied to prepay the Advances (to the extent the
     Commitments hereunder are reduced simultaneously with such issuance), (c)
     ordinary and necessary expenses incurred by Terra as a result of its
     operations as a publicly-held holding company and (d) other payments in an
     aggregate amount up to $5,000,000 per year to the extent required under
     pre-existing obligations.

          "SPU Redemption" means the purchase, redemption or other acquisition
           --------------
     from time to time of all or a portion of the outstanding Senior Preference
     Units by Terra and its Subsidiaries (or any of them):

               (a)  on such terms and conditions as could not reasonably be
          expected to have a Material Adverse Effect; and

               (b)  in accordance in all material respects with the terms and
          conditions hereof.

          "SPU Redemption Time" means the time as of which all of the Senior
           -------------------
     Preference Units shall have been purchased or otherwise redeemed pursuant
     to the SPU Redemption.

          "Standard & Poor's" means Standard & Poor's Ratings Services, a
           -----------------
     division of The McGraw-Hill Companies, Inc., and its successors.

          "Subordinated Indebtedness" means Debt of Terra or any of its
           -------------------------
     Subsidiaries the payment of which is subordinated (on reasonably
     satisfactory terms and pursuant to documentation satisfactory to the
     Required Lenders) in right of payment to the prior payment in full of the
     Advances.

          "Subsidiary" of any Person means any corporation, partnership, joint
           ----------
     venture, limited liability company, trust or estate of which (or in which)
     more than 50% of (a) the issued and outstanding capital stock having
     ordinary voting power to elect a majority of the board of directors of such
     corporation (irrespective of whether at the time capital stock of any other
     class or classes of such corporation shall or might have voting power upon
     the occurrence of any contingency), (b) the interest in the capital or
     profits of such partnership, joint venture or limited liability company or
     (c) the beneficial interest in such trust or estate is at the time directly
     or indirectly owned or controlled by such Person, by such Person and one or
     more of its other Subsidiaries or by one or more of such Person's other
     Subsidiaries.  For all purposes of this Agreement and the other Loan
     Documents, BMLP and each of BMLP's Subsidiaries shall be deemed to be
     Subsidiaries of the Company so long as TMC or one of TMC's Subsidiaries is
     the sole general partner of BMLP.
<PAGE>

                                      -31-

          "Subsidiary Guarantor" means, collectively, (x) TNC, BMCH, Beaumont
           --------------------
     Holdings, TMC, TI, BMLP, Port Neal Corporation, Terra Oklahoma , Terra U.K.
     Holdings and BAI and (y) from and after the SPU Redemption Time, TNLP and
     its successors.

          "Subsidiary Pledge and Security Agreement" means an Amended and
           ----------------------------------------
     Restated Pledge and Security Agreement in substantially the form attached
     hereto as Exhibit B-3 between certain of the Guarantors and the Collateral
     Agent, as amended from time to time.

          "Terra" means Terra Industries Inc., a Maryland corporation and an
           -----
     indirect parent of the Company.

          "Terra Canada" means Terra International (Canada) Inc., a corporation
           ------------
     governed by the laws of Ontario and an indirect wholly owned Subsidiary of
     the Company.

          "Terra Canada Credit Facility" means the Credit Agreement dated as of
           ----------------------------
     December 31, 1997 and amended and restated as of March 31,1998 among Terra
     Canada, the lenders party thereto and Citibank, as administrative agent for
     said lenders, as from time to time amended.

          "Terra Canada Group" means, collectively, Terra Canada and its
           ------------------
     Subsidiaries, and a "member" of the Terra Canada Group means, individually,
     Terra Canada and each such Subsidiary.

          "Terra Capital Holdings" means Terra Capital Holdings, Inc., a
           ----------------------
     Delaware corporation and the direct parent of the Company.

          "Terra Capital Pledge and Security Agreement" means an Amended and
           -------------------------------------------
     Restated Pledge and Security Agreement in substantially the form attached
     hereto as Exhibit B-2 between the Company and the Collateral Agent, as
     amended from time to time.

          "Terra Customer Debt" means Debt of a customer of Terra or any of its
           -------------------
     Subsidiaries owing to Deere and Company ("Deere") or any of Deere's
                                               -----
     Subsidiaries, provided that:
                   --------

               (1)  such customer is required to repay such Debt in full within
          15 months of the date on which such Debt is incurred;

               (2)  in the reasonable opinion of TI, such customer is
          creditworthy; and

               (3)  it is a condition of the extension of credit by Deere or its
          Subsidiaries to such customer that TI Guarantees a portion of such
          Debt.
<PAGE>

                                      -32-

          "Terra Oklahoma" means Terra International (Oklahoma) Inc., a Delaware
           --------------
     corporation and a wholly owned Subsidiary of TI.

          "Terra Oklahoma Mortgage" means a Mortgage, Assignment of Rents,
           -----------------------
     Security Agreement and Fixture Filing in substantially the form attached
     hereto as Exhibit B-5 between Terra Oklahoma and the Collateral Agent, as
     amended from time to time.

          "Terra U.K." means Terra Nitrogen (U.K.) Limited, a corporation formed
           ----------
     under the laws of England and a wholly owned Subsidiary of Terra Canada.

          "Terra U.K. Customer Debt" means Debt of a customer of Terra U.K.
           ------------------------
     owing to Capital Bank Plc or another financial institution in the United
     Kingdom, provided that:
              --------

               (1)  such customer uses the entire principal proceeds of such
          Debt to pay for goods and services purchased from Terra U.K.;

               (2)  such customer is required to repay such Debt in full within
          12 months of the date on which such Debt is incurred;

               (3)  in the reasonable opinion of Terra U.K., such customer is
          creditworthy; and

               (4)  it is a condition of the extension of credit by Capital Bank
          Plc (or such other financial institution) to such customer that Terra
          U.K. Guarantee a portion of such Debt.

          "Terra U.K. Holdings" means Terra (U.K.) Holdings, Inc., a Delaware
           -------------------
     corporation and a direct Subsidiary of BMLP.

          "Terra U.K. Offtake Agreement" means, collectively, one or more
           ----------------------------
     nitrogen products offtake agreements between the Company and Terra U.K.
     entered into in connection with the transactions contemplated by the BMLP
     Partnership Agreement and the BMLP Support and Option Agreement, as from
     time to time amended.

          "Terra U.K. Term Loan" has the meaning specified in Section
           --------------------
     5.02(b)(2)(vi).

          "Terra U.K. Term Loan Agreement" means the credit agreement dated as
           ------------------------------
     of December 31, 1997 providing for the Terra U.K. Term Loan, as from time
     to time amended.

          "TI" means Terra International, Inc., a Delaware corporation and a
           --
     wholly owned Subsidiary of the Company.
<PAGE>

                                      -33-

          "TMC" means Terra Methanol Corporation, a Delaware corporation.
           ---

          "TNC" means Terra Nitrogen Corporation, a Delaware corporation and a
           ---
     wholly owned Subsidiary of the Company.

          "TNCLP" means Terra Nitrogen Company, L.P., a Delaware limited
           -----
     partnership and a Subsidiary of the Company.

          "TNLP" means Terra Nitrogen, Limited Partnership, a Delaware limited
           ----
     partnership and a Subsidiary of the Company.

          "TNLP Notes" has the meaning assigned to such term in Section
           ----------
     5.02(b)(2)(ii).

          "TNLP Pledge and Security Agreement" means an Amended and Restated
           ----------------------------------
     Pledge and Security Agreement in substantially the form attached hereto as
     Exhibit B-4 between TNLP and the Collateral Agent, as amended from time to
     time.

          "Type" refers to the distinction between Advances bearing interest at
           ----
     the Base Rate and Advances bearing interest at the Eurodollar Rate.

          "U.K. Nitrogen Assets" means the "Assets", as defined in the Sale of
           --------------------
     Business Agreement relating to the ICI Fertilizer Business dated November
     20, 1997 between ICI, Terra U.K. and Terra.

          "Unused Commitment" means, with respect to any Lender at any time, (a)
           -----------------
     such Lender's Commitment at such time minus (without duplication) (b) the
                                           -----
     sum of (i) the aggregate outstanding principal amount of all Advances made
     by such Lender and (ii) such Lender's Pro Rata Share of the aggregate
     Available Amount of all Letters of Credit outstanding at such time and of
     all unreimbursed drawings thereunder.

          "U.S. Dollars" and "$" means lawful money of the United States of
           ------------       -
     America.

          Section 1.02.  Computation of Time Periods.  In this Agreement in the
                         ---------------------------
computation of periods of time from a specified date to a later specified date,
the word "from" means "from and including" and the words "to" and "until" mean
"to but excluding".

          Section 1.03.  Accounting Terms. All accounting terms not specifically
                         ----------------
defined herein shall be construed in accordance with GAAP.

                                  ARTICLE II

                       AMOUNTS AND TERMS OF THE ADVANCES
                           AND THE LETTERS OF CREDIT
<PAGE>

                                      -34-

          Section 2.01.  The Advances.
                         ------------

          (a)  (i)  Each Lender severally agrees, on the terms and conditions
     hereinafter set forth, to make advances ("Advances") to the Company from
                                               --------
     time to time on any Business Day during the period from the Restatement
     Date until the Commitment Termination Date in an aggregate amount at any
     one time outstanding not to exceed the amount set forth opposite such
     Lender's name on Schedule 2.01 under the caption "Commitment" or, if such
     Lender has entered into one or more Assignments and Acceptances, set forth
     for such Lender in the Register as such Lender's "Commitment" (such amount
     being such Lender's "Commitment"), and, as to all Lenders, in an aggregate
                          ----------
     amount at any one time outstanding not to exceed $62,812,500.00; provided
                                                                      --------
     that the Lenders shall not be obligated to make additional Advances on any
     Liquid Asset Coverage Date if the Aggregate Outstanding Exposure as of such
     date (determined after giving effect to the making of such Advances) would
     exceed the Adjusted Liquid Asset Coverage Amount as of such date.

          On the Restatement Date (i) all outstanding "Terra Advances" and "TNLP
     Advances" of each Lender under the Existing Credit Agreement shall
     automatically, without any action on the part of any Person, be deemed to
     be Advances hereunder and, without prejudice to the foregoing, the Borrower
     shall irrevocably and unconditionally assume and agree to pay and perform
     all of the obligations of TNLP, whether now existing or hereafter from time
     to time arising, under the Existing Credit Agreement, including without
     limitation the obligation of TNLP to pay the principal of and interest on
     the "TNLP Advances" and the "TNLP Letters of Credit" as defined therein and
     all other amounts payable by TNLP thereunder, (ii) the "TNLP Commitments"
     of each Lender under the Existing Credit Agreement shall automatically,
     without any action on the part of any Person, be terminated and (iii) all
     Interest Periods under the Existing Credit Agreement in respect of the
     "Terra Advances" and the "TNLP Advances" thereunder shall automatically be
     terminated, and, subject to the provisions of Section 2.01(b), the Company
     shall be permitted to Continue such "Terra Advances" as Eurodollar Rate
     Advances hereunder, or to Convert such "Terra Advances" into Base Rate
     Advances hereunder.

          (ii)  The Advances shall be made by the Lenders ratably according to
     their respective Commitments.

          (iii) Within the limits of each Lender's Commitment in effect from
     time to time, the Company may borrow under this Section 2.01(a) and/or
     obtain the issuance of Letters of Credit under Section 2.13, prepay
     pursuant to Section 2.05(a) and reborrow under this Section 2.01(a);
     provided that the aggregate outstanding principal amount of Advances when
     --------
     added to the aggregate Letter of Credit Liability may not at any time
     exceed the aggregate amount of the Commitments at such time.
<PAGE>

                                      -35-

          (iv)  The proceeds of the Advances shall be used solely (A) for
     general corporate purposes of the Company and its Subsidiaries, including,
     without limitation, to finance the ongoing working capital needs of, and to
     refinance outstanding Debt of, such Persons, (B) to finance all or a
     portion of the SPU Redemption (subject to the provisions of Section
     5.02(f)(ix))and (C) to repay the full (or any portion thereof) outstanding
     principal amount of the loans (together with accrued interest thereon and
     any and all other amounts owing thereunder) under the Terra Canada Credit
     Facility.

          (v)   Notwithstanding the foregoing provisions of Section 2.01(a), the
     Company agrees that, for a period of 30 consecutive days during each fiscal
     year it will prepay the Advances in such amounts as shall be necessary so
     the aggregate outstanding principal amount of the Advances shall not exceed
     the Cleanup Amount as in effect at such time; provided that this Section
                                                   --------
     2.01(a)(v) shall not prevent the Company from requesting the issuance of
     Letters of Credit during any such period pursuant to Section 2.13, or the
     Lenders from making Advances in respect thereof pursuant to Section
     2.13(c), which Advances (subject to the other terms and conditions of this
     Agreement) may remain outstanding during such period.  For purposes hereof,
     "Cleanup Amount" means, at any time during the periods set forth in column
      --------------
     (A) below, the respective amount set forth for such period in column (B)
     below:

<TABLE>
<CAPTION>
                      (A)                            (B)
                    Period                     Cleanup Amount
                 ---------------               --------------
          <S>                                  <C>
          From January 1, 1999 to                $60,000,000
           December 31, 1999

          From and after January 1, 2000         $30,000,000
</TABLE>

          (b)  Minimum Amounts.  Each Borrowing shall be in an aggregate amount
               ---------------
at least equal to $3,000,000 or an integral multiple of $1,000,000 in excess
thereof.

          (c)  No Responsibility to Third Parties.  Neither the Administrative
               ----------------------------------
Agent nor any Lender nor any Issuing Bank shall have any responsibility as to
the application or use of any of the proceeds of any Advance.

          Section 2.02.  Making the Advances.
                         -------------------

          (a)  (i) Except as otherwise provided in Section 2.13, each Borrowing
     shall be made on notice, given not later than 11:00 A.M. (New York City
     time) on the Business Day of (or, with respect to a Borrowing of Eurodollar
     Rate Advances, 10:00 A.M. (New York City time) on the second Business Day
     prior to the date of) the proposed Borrowing, by the Borrower to the
     Administrative Agent, which shall give to each Lender prompt notice thereof
     by telex, telecopier or cable.  Each such notice of a Borrowing (a "Notice
                                                                         ------
     of Borrowing") shall be by telex, telecopier or cable, confirmed
     ------------
<PAGE>

                                      -36-

     immediately in writing, in substantially the form of Exhibit C, specifying
     therein (1) the requested date of such Borrowing, (2) the requested Type of
     Advances comprising such Borrowing, (3) the requested aggregate amount of
     such Borrowing, (4) in the case of a Borrowing consisting of Eurodollar
     Rate Advances, the requested initial Interest Period for each such Advance
     and (5) whether the proposed Borrowing Date is a Liquid Asset Coverage Date
     (and, if so, specifying therein the Liquid Asset Coverage Amount, the
     Adjusted Liquid Asset Coverage Amount and the Aggregate Outstanding
     Exposure before giving effect to the proposed Advances).

          (ii)  In the case of a proposed Borrowing comprised of Eurodollar Rate
     Advances, the Administrative Agent shall promptly notify each Lender of the
     applicable interest rate under Section 2.06(a)(ii).

          (iii) Each Lender shall, before 1:00 P.M. (New York City time) on the
     date of each Borrowing, make available for the account of its Applicable
     Lending Office to the Administrative Agent at the Administrative Agent's
     Account, in same day funds, such Lender's ratable portion of such
     Borrowing.  After the Administrative Agent's receipt of such funds and upon
     fulfillment of the applicable conditions set forth in Article III, the
     Administrative Agent will transfer same day funds to the Borrower's
     Account; provided that the Administrative Agent shall first make a portion
              --------
     of such funds equal to any unreimbursed drawing under any Letter of Credit
     available to each Issuing Bank having issued any such Letter of Credit for
     reimbursement of such drawing.

          (b)  Anything in subsection (a) above to the contrary notwithstanding,
(i) the Borrower shall not select Eurodollar Rate Advances (y) for any Borrowing
if the aggregate amount of such Borrowing is less than $3,000,000 or (z) if the
obligation of the Lenders to make Eurodollar Rate Advances shall then be
suspended pursuant to Section 2.08 or 2.09, and (ii) Eurodollar Rate Advances
may not be outstanding under more than 15 separate Interest Periods at any one
time.

          (c)  Each Notice of Borrowing shall be irrevocable and binding on the
Borrower.  In the case of any Borrowing that the related Notice of Borrowing
specifies is to be comprised of Eurodollar Rate Advances, the Borrower shall
indemnify each Lender against any loss, cost or expense incurred by such Lender
as a result of any failure to fulfill on or before the date specified in such
Notice of Borrowing for such Borrowing the applicable conditions set forth in
Article III, including, without limitation, any loss (including loss of
anticipated profits), cost or expense incurred by reason of the liquidation or
reemployment of deposits or other funds acquired by such Lender to fund the
Advance to be made by such Lender as part of such Borrowing when such Advance,
as a result of such failure, is not made on such date.

          (d)  Unless the Administrative Agent shall have received notice from a
Lender prior to 12:00 Noon (New York City time) on the date of any Borrowing
that such Lender will not make available to the Administrative Agent such
Lender's ratable portion of such Borrowing, the Administrative Agent may assume
that such Lender has made such portion available to the
<PAGE>

                                      -37-

Administrative Agent on the date of such Borrowing in accordance with Section
2.02(a) and the Administrative Agent may, in reliance upon such assumption, make
available to the Borrower on such date a corresponding amount. If and to the
extent that such Lender shall not have so made such ratable portion available to
the Administrative Agent and the Administrative Agent shall have made available
such corresponding amount to the Borrower, such Lender and the Borrower
severally agree to repay to the Administrative Agent forthwith on demand such
corresponding amount together with interest thereon, for each day from the date
such amount is made available to the Borrower until the date such amount is
repaid to the Administrative Agent, at (i) in the case of the Borrower, the
interest rate applicable at such time under Section 2.06 to Advances comprising
such Borrowing and (ii) in the case of such Lender, the Federal Funds Rate. If
such Lender shall repay to the Administrative Agent such corresponding amount,
such amount so repaid shall constitute such Lender's Advance as part of such
Borrowing for purposes of this Agreement.

          (e)  The failure of any Lender to make the Advance to be made by it as
part of any Borrowing shall not relieve any other Lender of its obligation, if
any, hereunder to make its Advance on the date of such Borrowing, but no Lender
shall be responsible for the failure of any other Lender to make the Advance to
be made by such other Lender on the date of any Borrowing.

          Section 2.03.  Repayment.  The Company hereby promises to pay to the
                         ---------
Administrative Agent for the account of each Lender the full outstanding
principal amount of the Advances of such Lender on the Commitment Termination
Date. In addition, if following any Commitment Reduction Date the aggregate
principal amount of the Advances, together with the aggregate amount of all
Letter of Credit Liabilities, shall exceed the Commitments, the Company shall,
first, pay Advances and, second, provide cover for Letter of Credit Liabilities
in the manner specified in Section 2.05(d)) in an aggregate amount equal to such
excess. All repayments of principal under this Section 2.03 shall be made
together with interest accrued to the date of such repayment on the principal
amount repaid.

          Section 2.04.  Termination or Reduction of the Commitments.
                         -------------------------------------------

          (a)  Optional.  The Borrower may at any time or from time to time,
               --------
upon not less than two Business Days' notice to the Administrative Agent,
terminate in whole or reduce in part the Commitments, provided that (i) each
                                                      --------
partial reduction of the Commitments shall be in an aggregate amount of
$3,000,000 or an integral multiple of $1,000,000 in excess thereof, and (ii) the
aggregate amount of the Commitments shall not be reduced below the Letter of
Credit Commitment.

          (b)  Mandatory.  The Commitments shall be automatically and
               ---------
permanently reduced to zero on the Commitment Termination Date.  In addition,
the aggregate amount of the Commitments shall be automatically reduced on each
Commitment Reduction Date by an amount equal to the relevant Commitment Amount
Reduction (if any).
<PAGE>

                                      -38-

          (c)  Reductions Pro Rata; No Reinstatements.  Each reduction of the
               --------------------------------------
Commitments shall be applied to the Commitments of the Lenders pro rata
according to the respective amounts of their respective Commitments.
Commitments once terminated or reduced may not be reinstated.

          Section 2.05.  Prepayments, Etc.
                         -----------------

          (a)  Optional Prepayments.  (i) The Borrower may, upon at least two
               --------------------
     Business Days' notice (in the case of prepayment of Eurodollar Rate
     Advances) or upon notice given on the date of prepayment (in the case of
     prepayments of Base Rate Advances) to the Administrative Agent (which
     notice shall state the proposed date and aggregate principal amount of the
     prepayment), and if such notice is given the Borrower shall, prepay the
     outstanding principal amount of the Advances in the aggregate amount and on
     the date specified in such notice, together with accrued interest to the
     date of such prepayment on the principal amount prepaid; provided that (x)
                                                              --------
     each partial prepayment shall be in an aggregate principal amount of
     $3,000,000 or an integral multiple of $1,000,000 in excess thereof, (y) any
     such prepayment of a Eurodollar Rate Advance other than on the last day of
     the Interest Period therefor shall be accompanied by, and subject to, the
     payment of any amount payable under Section 9.04(c) in respect of such
     prepayment and (z) each such notice shall be made on the relevant day not
     later than, in the case of prepayments of Eurodollar Rate Advances, 10:00
     A.M. (New York City time) and, in the case of prepayments of Base Rate
     Advances, 12:00 Noon (New York City time).

          (ii)  Each prepayment of Advances under this Section 2.05(a) shall be
     made for account of the Lenders according to their Pro Rata Shares of the
     principal amount of the Advances.

          (b)  Mandatory Prepayments; Commitment Reductions.
               --------------------------------------------

          (i)  Sale of Assets.  Without limiting the obligation of the Company
               --------------
     to obtain the consent of the Required Lenders pursuant to Section 5.02(e)
     to any Disposition not otherwise permitted hereunder, immediately upon the
     consummation of each Disposition (other than (x) the sale of the
     Distribution Business by Terra pursuant to the Distribution Business Sale
     Agreement and (y) the sale, assignment, transfer or disposition to one or
     more third parties of any property excluded from the sale of the
     Distribution Business pursuant to Section 4.1.13.3 of the Distribution
     Business Sale Agreement) occurring on or after the Restatement Date the
     Company shall prepay the Advances (and/or provide cover for Letter of
     Credit Liabilities as specified in Section 2.05(d)), and the Commitments
     shall be subject to automatic reduction, in an aggregate amount equal to
     the Net Available Proceeds of such Disposition; provided that the following
                                                     --------
     shall not be deemed to be Dispositions for purposes of this clause (i):
<PAGE>

                                      -39-

               (1)  the sale by the Company or any of its Subsidiaries of
          Receivables under an Intercompany Receivables Facility;

               (2)  the sale of any property by any member of the Terra Canada
          Group (to the extent the proceeds of such Disposition have been
          applied to prepay the loans outstanding under the Terra Canada Credit
          Facility);

               (3)  the transactions relating to the construction of the Ammonia
          Loop;

               (4)  the transactions under the Ammonium Nitrate Hedging
          Agreement and

               (5)  prior to the SPU Redemption Date, Dispositions by TNLP (but
          only to the extent the Net Available Proceeds of such Disposition
          exceed the aggregate principal amount of TNLP Notes then outstanding).

          (ii)  Casualty Events.  Upon the date 90 days following the receipt by
                ---------------
     Terra or any of its Subsidiaries of the proceeds of insurance, condemnation
     award or other compensation in respect of any Casualty Event affecting any
     property of Terra or any of its Subsidiaries, the Company shall prepay the
     Advances (and/or provide cover for Letter of Credit Liabilities as
     specified in Section 2.05(d)), and the Commitments shall be subject to
     automatic reduction, in an aggregate amount, if any, equal to the Net
     Available Proceeds of such Casualty Event not theretofore applied, or
     committed to be applied, to the repair or replacement of such property or
     set aside for such purpose; provided that the following events shall not
                                 --------
     require prepayments (and/or Commitment reductions) pursuant to this clause
     (ii):

               (1)  Casualty Events affecting property of any member of the
          Terra Canada Group (to the extent the proceeds of insurance,
          condemnation awards or other compensation are applied to the repair or
          replacement of such property or are applied to prepay the loans
          outstanding under the Terra Canada Credit Facility); and

               (2)  prior to the SPU Redemption Date, Casualty Events affecting
          property of TNLP (to the extent the proceeds of insurance,
          condemnation awards or other compensation are applied to the repair or
          replacement of such property or exceed the aggregate principal amount
          of TNLP Notes then outstanding).

     Nothing in this clause (ii) shall be deemed to limit any obligation of
     Terra or any of its Subsidiaries pursuant to any of the Security Documents
     to remit to a collateral or similar account (including, without limitation,
     a Collateral Account under and as defined in the Security Documents)
     maintained by the Collateral Agent pursuant to any of the Security
     Documents the proceeds of insurance, condemnation award or other
     compensation received in respect of any Casualty Event.
<PAGE>

                                      -40-

          (iii)  Liquid Asset Coverage Events.  If on any Liquid Asset Coverage
                 ----------------------------
     Date the Aggregate Outstanding Exposure exceeds the Adjusted Liquid Asset
     Coverage Amount, the Company shall prepay the Advances (and/or provide
     cover for Letter of Credit Liabilities as specified in Section 2.05(d)) in
     an aggregate amount equal to such excess.  No prepayment pursuant to this
     clause (iii) shall require the Commitments to be reduced pursuant to
     Section 2.05(c).

          (c)    Application.  On the dates specified in clauses (i) and (ii) of
                 -----------
Section 2.05(b), the Commitments shall be reduced automatically in an aggregate
amount equal to the amount specified in such paragraphs (and to the extent that,
after giving effect to such reduction, the Aggregate Outstanding Exposure would
exceed the Commitments, the Company shall, first, prepay Advances and, second,
provide cover for Letter of Credit Liabilities as specified in paragraph (d)
below, in an aggregate amount equal to such excess).

          (d)    Cover for Letter of Credit Liabilities.  In the event that the
                 --------------------------------------
Company shall be required pursuant to Section 2.03 or Section 2.05(b) to provide
cover for Letter of Credit Liabilities, the Company shall effect the same by
paying to the Administrative Agent same day funds in an amount equal to the
required amount, which funds shall be deposited in the L/C Cash Collateral
Account until such time as the Letters of Credit shall have been terminated and
all of the Letter of Credit Liabilities paid in full.

          (e)    Payments with Interest. All prepayments under this Section 2.05
                 ----------------------
shall be made together with accrued interest to the date of such prepayment on
the principal amount prepaid.

          Section 2.06.  Interest.
                         --------

          (a)    Ordinary Interest. The Company shall pay interest on the unpaid
                 -----------------
principal amount of each Advance owing to each Lender from the date of such
Advance until such principal amount shall be paid in full at the following rates
per annum:

          (i)    Base Rate Advances. While such Advance is a Base Rate Advance,
                 ------------------
     a rate per annum equal at all times to the sum of (1) the Base Rate in
     effect from time to time plus (2) the Applicable Margin in eff ect from
                              ----
     time to time, payable in arrears quarterly on each Quarterly Date and on
     the date such Base Rate Advance shall be Converted (but only on the amount
     Converted) or paid in full.

          (ii)   Eurodollar Rate Advances.  While such Advance is a Eurodollar
                 ------------------------
     Rate Advance, a rate per annum equal at all times during each Interest
     Period for such Advance to the sum of (1) the Eurodollar Rate for such
     Interest Period for such Advance plus (2) the Applicable Margin in effect
                                      ----
     from time to time, payable in arrears on the last day of such Interest
     Period and, if such Interest Period has a duration of more than three
<PAGE>

                                      -41-

     months, on each three-month anniversary of the first day of such Interest
     Period occurring during such Interest Period.

          (b)  Post-Default Interest.  If (a) any Obligor shall fail to pay when
               ---------------------
due (by acceleration or otherwise) any amount payable under any Loan Document
after any applicable grace period provided in Section 6.01(a), or (b) (i) an
Event of Default shall have occurred and be continuing during any period and
(ii) the Administrative Agent or the Required Lenders, through the
Administrative Agent, shall have notified the Borrower thereof, the Borrower
shall, notwithstanding anything else in this Agreement to the contrary, pay to
the Administrative Agent for account of each Lender interest, during such
period, at the applicable Post-Default Rate on the outstanding principal of each
Advance, and on any other amount whatsoever then due and payable by the Borrower
hereunder or under the Notes held by such Lender to or for account of such
Lender, such interest to be payable from time to time on demand.

          Section 2.07.  Fees.
                         ----

          (a)  Commitment Fee.  The Borrower hereby promises to pay to the
               --------------
Administrative Agent for the account of each Lender a commitment fee on the
average daily Unused Commitment of such Lender for the period from the
Restatement Date (or from the effective date specified in the Assignment and
Acceptance pursuant to which it became a Lender in the case of each other Lender
other than the Initial Lenders) until the Commitment Termination Date at the
Applicable Commitment Fee Rate, payable in arrears (x) quarterly after the
Restatement Date on each Quarterly Date and (y) on the Commitment Termination
Date.

          (b)  Letter of Credit Commission, Etc.  The Company hereby promises to
               ---------------------------------
pay to the Administrative Agent (A) for the account of each Issuing Bank a non-
refundable fronting fee at a rate per annum to be agreed upon between such
Issuing Bank and the Borrower and consented to by the Administrative Agent in
respect of each Letter of Credit issued by it for the period from the date of
issuance thereof until such Letter of Credit has been drawn in full, expires or
is terminated and (B) for the account of each Lender a non-refundable commission
on such Lender's Pro Rata Share of the average daily aggregate Available Amount
of all Letters of Credit then outstanding at the Applicable Letter of Credit Fee
Rate, such fees to be payable in arrears on each Quarterly Date and on the
Commitment Termination Date and calculated, for any day, after giving effect to
any payments made under such Letter of Credit on such day.

          (c)  Letter of Credit Expenses.  The Borrower shall pay to each
               -------------------------
Issuing Bank, for its own account, such commission, issuance fees, transfer fees
and other fees and charges in connection with the issuance or administration of
the Letters of Credit issued by it as the Borrower and such Issuing Bank shall
agree; provided that all fees and other charges payable pursuant to this Section
       --------
2.07(c) shall be the customary amounts charged by such Issuing Bank in
connection with the issuance or administration of similar letters of credit and
the amounts so determined shall be adjusted as necessary to avoid a duplicative
payment hereunder.

          Section 2.08.  Conversion and Continuation of Advances.
                         ---------------------------------------
<PAGE>

                                      -42-

          (a)  Optional Conversion.  The Borrower may on any Business Day, upon
               -------------------
notice given to the Administrative Agent not later than 10:00 A.M. (New York
City time) on the second Business Day prior to the date of the proposed
Conversion and subject to the provisions of Sections 2.09 and 2.10, Convert all
or any portion of the Advances of one Type outstanding hereunder (and, in the
case of Eurodollar Rate Advances, having the same Interest Period); provided
                                                                    --------
that any Conversion of Eurodollar Rate Advances into Base Rate Advances shall be
made only on the last day of an Interest Period for such Eurodollar Rate
Advances, any Conversion of Base Rate Advances into Eurodollar Rate Advances
shall be in an amount not less than the minimum amount specified in Section
2.02(b)(i) and no Conversion of any Advances shall result in a greater number of
separate Interest Periods in respect of Eurodollar Rate Advances than permitted
under Section 2.02(b)(ii).  Each such notice of Conversion shall, within the
restrictions specified above, specify (i) the date of such Conversion, (ii) the
aggregate amount and Type of the Advances (and, in the case of Eurodollar Rate
Advances, the Interest Period therefor) to be Converted and (iii) if such
Conversion is into Eurodollar Rate Advances, the duration of the initial
Interest Period for such Advances.  Each notice of Conversion shall be
irrevocable and binding on the Borrower.

          (b)  Certain Mandatory Conversions.
               -----------------------------

          (i)   On the date on which the aggregate unpaid principal amount of
     Eurodollar Rate Advances comprising any Borrowing shall be reduced, by
     payment or prepayment or otherwise, to less than $3,000,000 such Advances
     shall automatically Convert into Base Rate Advances.

          (ii)  If the Borrower shall fail to select the duration of any
     Interest Period for any outstanding Eurodollar Rate Advances in accordance
     with the provisions contained in the definition of "Interest Period" in
     Section 1.01 and in clause (a) or (c) of this Section 2.08, the
     Administrative Agent will forthwith so notify the Borrower and the Lenders,
     whereupon each such Eurodollar Rate Advance will automatically, on the last
     day of the then existing Interest Period therefor, Convert into a Base Rate
     Advance.

          (iii) Upon the occurrence and during the continuance of any Event of
     Default and upon notice from the Administrative Agent to the Borrower at
     the request of the Required Lenders, (x) each Eurodollar Rate Advance will
     automatically, on the last day of the then existing Interest Period
     therefor, Convert into a Base Rate Advance and (y) the obligation of the
     Lenders to make, or to Convert Advances into, or to Continue, Eurodollar
     Rate Advances shall be suspended.

          (c)  Continuations.  The Borrower may, on any Business Day, upon
               -------------
notice given to the Administrative Agent not later than 10:00 A.M. (New York
City time) on the second Business Day prior to the date of the proposed
Continuation and subject to the provisions of Sections 2.09, Continue all or any
portion of the Eurodollar Rate Advances outstanding hereunder having the same
Interest Period as such Eurodollar Rate Advances; provided that any
                                                  --------
<PAGE>

                                      -43-

such Continuation shall be made only on the last day of an Interest Period for
such Eurodollar Rate Advances, any Continuation of Eurodollar Rate Advances
shall be in an amount not less than the minimum Borrowing amount specified in
Section 2.02(b)(i) and no Continuation of any Eurodollar Rate Advances shall
result in a greater number of separate Interest Periods in respect of Eurodollar
Rate Advances hereunder than permitted under Section 2.02(b)(ii). Each such
notice of Continuation shall, within the restrictions specified above, specify
(i) the date of such Continuation, (ii) the aggregate amount of, and the
Interest Period for, the Advances being Continued and (iii) the duration of the
initial Interest Period for the Eurodollar Rate Advances subject to such
Continuation. Each notice of Continuation shall be irrevocable and binding on
the Borrower.


          Section 2.09.  Increased Costs, Illegality, Etc.
                         ---------------------------------

          (a)  If, due to either (i) the introduction of or any change in or in
the interpretation of (to the extent any such introduction or change occurs
after the date hereof) any law or regulation or (ii) the compliance with any
guideline or request from any central bank or other governmental authority
adopted or made after the date hereof (whether or not having the force of law),
there shall be any increase in the cost to any Lender of agreeing to make or
making, funding or maintaining Eurodollar Rate Advances hereunder, then the
Borrower shall from time to time, upon demand by such Lender (with a copy of
such demand to the Administrative Agent), pay to the Administrative Agent for
the account of such Lender additional amounts sufficient to compensate such
Lender for such increased cost; provided that, before making any such demand,
                                --------
each Lender agrees to use reasonable efforts (consistent with its internal
policy and legal and regulatory restrictions) to designate a different
Applicable Lending Office if the making of such a designation would avoid the
need for, or reduce the amount of, such increased cost and would not, in the
reasonable judgment of such Lender, be otherwise disadvantageous to such Lender.
A certificate as to the amount of such increased cost, submitted to the Borrower
by such Lender, shall be conclusive and binding for all purposes, absent
manifest error.

          (b)  If any Lender determines in good faith that compliance with any
law or regulation enacted or introduced after the date hereof or any guideline
or request from any central bank or other governmental authority adopted or made
after the date hereof (whether or not having the force of law) affects or would
affect the amount of capital required or expected to be maintained by such
Lender or any corporation controlling such Lender and that the amount of such
capital is increased by or based upon the existence of such Lender's commitment
to lend hereunder and other commitments of this type or the issuance of the
Letters of Credit (or similar contingent obligations), then, upon demand by such
Lender (with a copy of such demand to the Administrative Agent), the Borrower
shall pay to the Administrative Agent for the account of such Lender, from time
to time as specified by such Lender, additional amounts sufficient to compensate
such Lender in the light of such circumstances, to the extent that such Lender
reasonably determines such increase in capital to be allocable to the existence
of such Lender's commitment to lend hereunder or to the issuance or maintenance
of any Letters of Credit.  A
<PAGE>

                                      -44-

certificate as to such amounts submitted to the Borrower by such Lender, shall
be conclusive and binding for all purposes, absent manifest error.

          (c)  If, with respect to any Eurodollar Rate Advances, (i) the
Required Lenders reasonably determine and notify the Administrative Agent that
the Eurodollar Rate for any Interest Period for such Advances will not
adequately reflect the cost to such Required Lenders of making, funding or
maintaining their respective Eurodollar Rate Advances for such Interest Period,
or (ii) if fewer than two Reference Banks furnish timely information to the
Administrative Agent for determining the Eurodollar Rate for any Eurodollar Rate
Advances, the Administrative Agent shall forthwith so notify the Borrower and
the Lenders, whereupon (x) each Eurodollar Rate Advance will automatically, on
the last day of any then existing Interest Period therefor, Convert to a Base
Rate Advance, and (y) the obligation of the Lenders to make, or to Convert
Advances into, or to Continue, Eurodollar Rate Advances shall be suspended until
the Administrative Agent shall notify the Borrower and such Lenders that the
circumstances causing such suspension no longer exist.

          (d)  Notwithstanding any other provision of this Agreement, if the
introduction of or any change in or in the interpretation of (to the extent any
such introduction or change occurs after the date hereof) any law or regulation
shall make it unlawful, or any central bank or other governmental authority
having appropriate jurisdiction shall assert in writing that it is unlawful, for
any Lender or its Eurodollar Lending Office to perform its obligations hereunder
to make Eurodollar Rate Advances or to continue to fund or maintain Eurodollar
Rate Advances hereunder, then, on notice thereof and demand therefor by such
Lender to the Borrower through the Administrative Agent, (i) each Eurodollar
Rate Advance of such Lender will automatically, upon such demand, Convert to a
Base Rate Advance and (ii) the obligation of such Lender to make, or to Convert
Advances into, or to Continue, Eurodollar Rate Advances shall be suspended until
the Administrative Agent shall notify the Borrower that such Lender has
determined that the circumstances causing such suspension no longer exist;
provided that, before making any such demand, such Lender agrees to use
- --------
reasonable efforts (consistent with its internal policy and legal and regulatory
restrictions) to designate a different Eurodollar Lending Office if the making
of such a designation would allow such Lender or its Eurodollar Lending Office
to continue to perform its obligations to make Eurodollar Rate Advances or to
continue to fund or maintain Eurodollar Rate Advances and would not, in the
judgment of such Lender, be otherwise disadvantageous to such Lender.

          (e)  The Borrower shall not be obligated to pay any additional amounts
arising pursuant to clauses (a) and (b) of this Section 2.09 that are
attributable to the Excluded Period with respect to such additional amount;
provided that if an applicable law, rule, regulation, guideline or request shall
- --------
be adopted or made on any date and shall be applicable to the period (a
"Retroactive Period") prior to the date on which such law, rule, regulation,
 ------------------
guideline or request is adopted or made, the limitation on the Borrower's
obligations to pay such additional amounts hereunder shall not apply to the
additional amounts payable in respect of such Retroactive Period.
<PAGE>

                                      -45-

          Section 2.10.  Payments and Computations.
                         -------------------------

          (a)  The Borrower shall make each payment hereunder and under the
Notes not later than 12:00 Noon (New York City time) on the day when due in U.S.
Dollars to the Administrative Agent at the Administrative Agent's Account in
same day funds and, except as expressly set forth herein, without deduction,
set-off or counterclaim.  The Administrative Agent will promptly thereafter
cause to be distributed like funds relating to the payment of principal or
interest or commitment fees hereunder ratably (other than amounts payable
pursuant to Section 2.09(a), 2.09(b), 2.11, 2.13(d) or 9.04(c), or amounts
payable to an Issuing Bank in respect of Letters of Credit) to the Lenders for
the account of their Applicable Lending Offices, and like funds relating to the
payment of any other amount payable to any Lender to such Lender for the account
of its Applicable Lending Office, in each case to be applied in accordance with
the terms of this Agreement.  Upon its acceptance of an Assignment and
Acceptance and recording of the information contained therein in the Register
pursuant to Section 9.07(d), from and after the effective date of such
Assignment and Acceptance, the Administrative Agent shall make all payments
hereunder and under the Notes in respect of the interest assigned thereby to the
Lender assignee thereunder, and the parties to such Assignment and Acceptance
shall make all appropriate adjustments in such payments for periods prior to
such effective date directly between themselves.

          (b)  If the Administrative Agent receives funds for application to the
Obligations under the Basic Documents under circumstances for which the Basic
Documents do not specify the Advances to which, or the manner in which, such
funds are to be applied, and the Borrower has not otherwise directed how such
funds are to be applied (which direction is consistent with the terms of the
Basic Documents), the Administrative Agent may, but shall not be obligated to,
elect to distribute such funds to each Lender ratably in accordance with such
Lender's proportionate share of the principal amount of all outstanding Advances
and the Available Amount of all Letters of Credit then outstanding, in repayment
or prepayment of such of the outstanding Advances or other Obligations owed to
such Lender, and for application to such principal installments, as the
Administrative Agent shall direct.

          (c)  The Borrower hereby authorizes each Lender, if and to the extent
payment owed to such Lender is not made when due hereunder or under the Note
held by such Lender, to charge from time to time against any or all of the
Borrower's accounts with such Lender any amount so due (with notice to the
Administrative Agent and the Borrower promptly following such charge).

          (d)  Each Reference Bank agrees to furnish to the Administrative Agent
timely information for the purpose of determining each Eurodollar Rate.  If any
one or more of the Reference Banks shall not furnish such timely information to
the Administrative Agent for the purpose of determining any such interest rate,
the Administrative Agent shall determine such interest rate on the basis of
timely information furnished by the remaining Reference Banks.
<PAGE>

                                      -46-

          (e)  All computations of interest, fees and Letter of Credit
commissions shall be made by the Administrative Agent on the basis of a year of
360 days, in each case for the actual number of days (including the first day
but excluding the last day) occurring in the period for which such interest,
fees or commissions are payable.  Each determination by the Administrative Agent
of an interest rate, fee or commission hereunder made in accordance with the
provisions of this Agreement shall be conclusive and binding for all purposes,
absent manifest error.

          (f)  Whenever any payment hereunder or under the Notes shall be stated
to be due on a day other than a Business Day, such payment shall be made on the
next succeeding Business Day, and such extension of time shall in such case be
included in the computation of payment of interest or commitment fee, as the
case may be; provided that, if such extension would cause payment of interest on
             --------
or principal of Eurodollar Rate Advances to be made in the next following
calendar month, such payment shall be made on the immediately preceding Business
Day.

          (g)  Unless the Administrative Agent shall have received notice from
the Borrower prior to the date on which any payment is due to any Lender
hereunder that the Borrower will not make such payment in full, the
Administrative Agent may assume that the Borrower has made such payment in full
to the Administrative Agent on such date and the Administrative Agent may, in
reliance upon such assumption, cause to be distributed to each such Lender on
such due date an amount equal to the amount then due such Lender.  If and to the
extent the Borrower shall not have so made such payment in full to the
Administrative Agent, each such Lender shall repay to the Administrative Agent
forthwith on demand such amount distributed to such Lender together with
interest thereon, for each day from the date such amount is distributed to such
Lender until the date such Lender repays such amount to the Administrative
Agent, at the Federal Funds Rate.

          Section 2.11.  Taxes.
                         -----

          (a)  Any and all payments by each Obligor hereunder or under the Notes
shall be made, in accordance with Section 2.10, free and clear of and without
deduction for any and all present or future taxes, levies, imposts, deductions,
charges or withholdings, and all liabilities with respect thereto, excluding, in
                                                                   ---------
the case of each Issuing Bank, each Lender and the Administrative Agent, net
income taxes that are imposed by the United States and franchise taxes and net
income taxes that are imposed on such Issuing Bank, such Lender or the
Administrative Agent by the state or foreign jurisdiction under the laws of
which such Issuing Bank, such Lender or the Administrative Agent (as the case
may be) is organized or any political subdivision thereof and, in the case of
such Issuing Bank and each Lender, franchise taxes and net income taxes that are
imposed on it by the state or foreign jurisdiction of such Issuing Bank's or
such Lender's Applicable Lending Office or any political subdivision thereof
(all such non-excluded taxes, levies, imposts, deductions, charges, withholdings
and liabilities being hereinafter referred to as "Taxes"). If an Obligor shall
                                                  -----
be required by law to deduct any Taxes from or in respect of any sum payable
hereunder or under any Note to any Issuing Bank, any Lender or the
Administrative Agent, (i) the sum payable shall be increased as may be necessary
<PAGE>

                                      -47-

so that after making all required deductions (including deductions applicable to
additional sums payable under this Section 2.11) such Issuing Bank, such Lender
or the Administrative Agent (as the case may be) receives an amount equal to the
sum it would have received had no such deductions been made, (ii) such Obligor
shall make such deductions and (iii) such Obligor shall pay the full amount
deducted to the relevant taxation authority or other authority in accordance
with applicable law.

          (b)  In addition, each Obligor agrees to pay any present or future
stamp or documentary taxes or any other excise or property taxes, charges or
similar levies that arise from any payment made by it hereunder or under the
Notes or from the execution, delivery or registration of this Agreement or the
Notes (hereinafter referred to as "Other Taxes").
                                   -----------

          (c)  Each Obligor will indemnify each Issuing Bank, each Lender and
the Administrative Agent for the full amount of Taxes or Other Taxes (including,
without limitation, any Taxes or Other Taxes imposed by any jurisdiction on
amounts payable under this Section 2.11) paid by such Issuing Bank, such Lender
or the Administrative Agent (as the case may be) and any liability (including
penalties, additions to tax, interest and expenses) arising therefrom or with
respect thereto. This indemnification shall be made within 30 days from such
date such Issuing Bank, such Lender or the Administrative Agent (as the case may
be) makes written demand therefor.

          (d)  Within 30 days after the date of any payment of Taxes, each
Obligor will furnish to the Administrative Agent, at its address referred to in
Section 9.02, appropriate evidence of payment thereof. If such Obligor shall
make a payment hereunder or under the Notes through an account or branch outside
the United States, or a payment is made on behalf of such Obligor by a payor
that is not a United States Person, such Obligor will, if no taxes are payable
in respect of such payment, furnish, or will cause such payor to furnish, to the
Administrative Agent, at such address, a certificate from the appropriate taxing
authority or authorities, or an opinion of counsel acceptable to the
Administrative Agent, in either case stating that such payment is exempt from or
not subject to Taxes. For purposes of this subsection (d) and subsection (e),
the terms "United States" and "United States Person" shall have the meanings
           -------------       --------------------
specified in Section 7701 of the Internal Revenue Code.

          (e)  Each Lender organized under the laws of a jurisdiction outside
the United States shall, on or prior to the date of its execution and delivery
of this Agreement (in the case of each Initial Lender) and on the date of the
Assignment and Acceptance pursuant to which it became a Lender (in the case of
each other Lender), and from time to time thereafter if requested in writing by
the Borrower or the Administrative Agent (but only so long as such Lender
remains lawfully able to do so after the date such Lender becomes a Lender
hereunder), provide the Administrative Agent and the Borrower with either (i)
Internal Revenue Service form 1001 or 4224, as appropriate, or any successor
form prescribed by the Internal Revenue Service, certifying that such Lender is
entitled to benefits under an income tax treaty to which the United States is a
party that reduces the rate of withholding tax on payments under this Agreement
and the Notes or certifying that the income receivable pursuant to this
Agreement and the Notes is
<PAGE>

                                      -48-

effectively connected with the conduct of a trade or business in the United
States or (ii) Internal Revenue Service form W-8BEN, upon which the Borrower is
entitled to rely, from a Lender that has not at the time such Lender becomes a
Lender hereunder been named in any notice issued by the Secretary of the
Treasury (or such Secretary's authorized delegate) pursuant to Sections
881(c)(2)(B) or 871(h)(5) of the Internal Revenue Code, or any successor form or
statement prescribed by the Internal Revenue Service in order to establish that
such Lender is entitled to treat the interest payments under this Agreement and
the Notes as portfolio interest that is exempt from withholding tax under the
Internal Revenue Code, together with a certificate stating that such Lender is
not described in Section 881(c)(3) of the Internal Revenue Code. If the form
provided by a Lender at the time such Lender first becomes a party to this
Agreement indicates a United States interest withholding tax rate in excess of
zero (or if the Lender cannot provide at such time such form because it is not
entitled to reduced withholding under a treaty, the payments are not effectively
connected income and the payments do not qualify as portfolio interest),
withholding tax at such rate (or at the then existing U.S. statutory rate if the
Lender cannot provide the form) shall be excluded from Taxes unless and until
such Lender provides the appropriate form certifying that a lesser rate applies,
whereupon withholding tax at such lesser rate only shall be excluded from Taxes
for periods governed by such form; provided that, if at the date of the
                                   --------
Assignment and Acceptance pursuant to which a Lender assignee becomes a party to
this Agreement, the Lender assignor was entitled to payments under subsection
(a) in respect of United States withholding tax with respect to interest paid at
such date, then, to the extent such tax results in liability for such payments,
the term Taxes shall include (in addition to withholding taxes that may be
imposed in the future or other amounts otherwise includable in Taxes) United
States interest withholding tax, if any, applicable with respect to the Lender
assignee on such date.

          (f)  For any period with respect to which a Lender has failed to
provide the Borrower and the Administrative Agent with the appropriate form
described in Section 2.11(e) (other than if such failure is due to a change in
law occurring after the date on which a form originally was required to be
provided or if such form otherwise is not required under subsection (e)), such
Lender shall not be entitled to indemnification under subsection (a) or (c) with
respect to Taxes imposed by the United States.

          (g)  Any Lender or any Issuing Bank claiming any additional amounts
payable pursuant to this Section 2.11 shall use reasonable efforts (consistent
with its internal policy and legal and regulatory restrictions) to change the
jurisdiction of its Applicable Lending Office(s) if the making of such a change
would avoid the need for, or reduce the amount of, any such additional amounts
that may thereafter accrue and would not, in the reasonable judgment of such
Lender or Issuing Bank, be otherwise disadvantageous to such Lender or Issuing
Bank.

          (h)  Without prejudice to the survival of any other agreement of the
Borrower hereunder, the agreements and obligations of the Borrower contained in
this Section 2.11 shall survive the payment in full of principal and interest
hereunder and under the Notes.
<PAGE>

                                      -49-

          Section 2.12. Sharing of Payments, Etc. If any Lender shall obtain any
                        -------------------------
payment (whether voluntary, involuntary, through the exercise of any right of
set-off, or otherwise) on account of the Advances owing to it (other than
pursuant to Section 2.09(a), 2.09(b), 2.11, 2.13(d) or 9.04(c), or payments to
an Issuing Bank in respect of Letters of Credit) in excess of its ratable share
of payments on account of the Advances obtained by all the Lenders, such Lender
shall forthwith purchase from the other Lenders such participations in the
Advances owing to them as shall be necessary to cause such purchasing Lender to
share the excess payment ratably with each of them; provided that if all or any
                                                    --------
portion of such excess payment is thereafter recovered from such purchasing
Lender, such purchase from each Lender shall be rescinded and such Lender shall
repay to the purchasing Lender the purchase price to the extent of such recovery
together with an amount equal to such Lender's ratable share (according to the
proportion of (i) the amount of such Lender's required repayment to (ii) the
total amount so recovered from the purchasing Lender) of any interest or other
amount paid or payable by the purchasing Lender in respect of the total amount
so recovered. The Borrower agrees that any Lender so purchasing a participation
from another Lender pursuant to this Section 2.12 may, to the fullest extent
permitted by law, exercise all its rights of payment (including the right of
set-off) with respect to such participation as fully as if such Lender were the
direct creditor of the Borrower in the amount of such participation.

          Section 2.13. Letters of Credit.
                        -----------------

          (a)  Issuance of Letters of Credit, Etc.  The Borrower may request one
               -----------------------------------
or more Issuing Banks to issue, on the terms and conditions hereinafter set
forth, letters of credit for the account of the Borrower (letters of credit so
issued being herein called "Letters of Credit") from time to time on any
                            -----------------
Business Day during the period from the Restatement Date until the date 90 days
prior to the Commitment Termination Date; provided that:
                                          --------

          (i)   the Commitments shall be utilized under this Section 2.13 solely
     for the issuance of Letters of Credit for the account of the Company and,
     to the extent specified by the Company, any of its wholly owned
     Subsidiaries;

          (ii)  the aggregate Available Amount of all Letters of Credit issued
     by all Issuing Banks shall not exceed at any time the Letter of Credit
     Sublimit, and the Aggregate Outstanding Exposure shall not exceed the
     aggregate Commitments of the Lenders on such Business Day;

          (iii) if the date on which such request is made (or the date as of
     which such Letter of Credit is to be issued) is a Liquid Asset Coverage
     Date, the Aggregate Outstanding Exposure as of such date (determined after
     giving effect to the making of Advances on such date and the issuance of
     such Letter of Credit as of such date) would not exceed the Adjusted Liquid
     Asset Coverage Amount as of such date;
<PAGE>

                                      -50-

          (iv) the aggregate amount of all Letter of Credit Liabilities under
     Letters of Credit issued by any Issuing Bank shall not exceed at any time
     the Letter of Credit Commitment of such Issuing Bank; and

          (v)  no Letter of Credit shall have an expiration date later than, or
     shall permit the account party or the beneficiary to require the renewal
     thereof to a date beyond, the date 30 days prior to the Commitment
     Termination Date.

On the Restatement Date, all outstanding "Terra Letters of Credit" and "TNLP
Letters of Credit" under the Existing Credit Agreement (the "Existing Letters of
                                                             -------------------
Credit") shall automatically, without any action on the part of any Person, be
- ------
deemed to be Letters of Credit hereunder for all purposes of this Agreement.  On
each day during the period commencing with the issuance by an Issuing Bank of
any Letter of Credit (or, in the case of any Existing Letter of Credit, during
the period commencing with the Restatement Date) and until such Letter of Credit
shall have been drawn in full or expired or been terminated, the Commitment of
each Lender shall be deemed to be utilized for all purposes of this Agreement in
an amount equal to such Lender's Pro Rata Share of the then undrawn amount of
such Letter of Credit.

          (b)  Request for Issuance.
               --------------------

          (i)  Each Letter of Credit shall be issued upon notice, given not
     later than 1:00 P.M. (New York City time) two Business Days prior to the
     date of the proposed issuance of such Letter of Credit, by the Borrower to
     the relevant Issuing Bank, which shall give to the Administrative Agent and
     each Lender prompt notice thereof by telex or telecopier.  Each such notice
     of issuance of a Letter of Credit (a "Notice of Issuance") shall be by
                                           ------------------
     telex or telecopier, confirmed promptly in writing, specifying therein (A)
     the requested date of such issuance (which shall be a Business Day), (B)
     the Available Amount requested for such Letter of Credit, (C) the
     expiration date of such Letter of Credit, (D) the account party or parties
     for such Letter of Credit, (E) the name and address of the issuer and the
     beneficiary of such Letter of Credit, (F) the form of such Letter of Credit
     and (G) whether the date of such notice (or the proposed issuance date) is
     a Liquid Asset Coverage Date (and, if so, specifying therein the Liquid
     Asset Coverage Amount, the Adjusted Liquid Asset Coverage Amount and the
     Aggregate Outstanding Exposure before giving effect to the proposed
     issuance), together with a description of the nature of the transactions or
     obligations proposed to be supported thereby. If the requested form of
     such Letter of Credit is acceptable to such Issuing Bank in its discretion,
     such Issuing Bank will, upon fulfillment of the applicable conditions set
     forth in Article III, make such Letter of Credit available to the Borrower
     at its office referred to in Section 9.02 or as otherwise agreed with the
     Borrower in connection with such issuance.

          (ii) Each Issuing Bank shall furnish (A) to the Administrative Agent
     on the first Business Day of each week a written report summarizing the
     issuance and expiration dates of Letters of Credit issued by such Issuing
     Bank during the previous week and drawings during such week under all
     Letters of Credit issued by such Issuing Bank,
<PAGE>

                                      -51-

     (B) to each Lender and to the Borrower on the first Business Day of each
     month, a written report summarizing the issuance and expiration dates of
     the Letters of Credit issued by such Issuing Bank during the preceding
     month and drawings during such month under all Letters of Credit issued by
     the Issuing Bank and (C) to the Administrative Agent and each Lender on the
     first Business Day of each calendar quarter, a written report setting forth
     the average daily aggregate Available Amount during the preceding calendar
     quarter of all Letters of Credit issued by such Issuing Bank.

          (c)   Drawing and Reimbursement.
                -------------------------

          (i)   The payment by an Issuing Bank of a draft drawn under any Letter
     of Credit shall constitute for all purposes of this Agreement the making by
     such Issuing Bank of an advance to the Borrower in the amount of such
     payment, which the Borrower agrees to repay on demand and, if not paid on
     demand, shall bear interest, from the date demanded to the date paid in
     full (and which interest shall be payable on demand), (x) from and
     including the date of demand to but not including the second Business Day
     thereafter at the Base Rate in effect for each such day plus the Applicable
                                                             ----
     Margin in effect for each such day, and (y) from and including said second
     Business Day thereafter at the Post-Default Rate.  Without limiting the
     obligations of the Borrower hereunder, upon demand by such Issuing Bank
     through the Administrative Agent, each Lender shall make Advances in an
     aggregate amount equal to the amount of such Lender's Pro Rata Share of
     such advance by making available for the account of its Applicable Lending
     Office to the Administrative Agent for the account of such Issuing Bank, by
     deposit to the Administrative Agent's Account, in same day funds, an amount
     equal to the sum of (A) its Pro Rata Share of the outstanding principal
     amount of such advance plus (B) interest accrued and unpaid to and as of
                            ----
     such date on the outstanding principal amount of such advance.

          (ii)  Each Lender agrees to make such Advances on the Business Day on
     which demand therefor is made by the relevant Issuing Bank through the
     Administrative Agent (provided that notice of such demand is given not
                           --------
     later than 12:00 Noon (New York City time) on such Business Day) or (if
     notice of such demand is given after such time) the first Business Day next
     succeeding such demand.

          (iii) If and to the extent that any Lender shall not have so made the
     amount of such Advance available to the Administrative Agent for account of
     such Issuing Bank, such Lender agrees to pay to the Administrative Agent
     forthwith on demand such amount together with interest thereon, for each
     day from the date of demand by the relevant Issuing Bank until the date
     such amount is paid to the Administrative Agent, at the Federal Funds Rate.

          (iv)  The Advances provided for in this Section 2.13 shall be made by
     the Lenders irrespective of whether there has occurred and is continuing
     any Default or Event of Default or of whether any other condition precedent
     specified in Article III has not been
<PAGE>

                                      -52-

     satisfied, and the obligation of each Lender to make such Advances is
     absolute and unconditional.

          (d)  Increased Costs.
               ---------------

          (i)  If any change in any law or regulation or in the interpretation
     thereof (to the extent any such change occurs after the date hereof) by any
     court or administrative or governmental authority charged with the
     administration thereof shall either (x) impose, modify or deem applicable
     any reserve, special deposit or similar requirement against letters of
     credit or guarantees issued by, or assets held by, or deposits in or for
     the account of, any Issuing Bank or any Lender or (y) impose on any Issuing
     Bank or any Lender any other condition regarding this Agreement or such
     Issuing Bank or such Lender or any Letter of Credit, and the result of any
     event referred to in the preceding clause (x) or (y) shall be to increase
     the cost to such Issuing Bank or Lender of issuing or maintaining any
     Letter of Credit or any commitment hereunder in respect of Letters of
     Credit, then, upon demand by such Issuing Bank or such Lender, the Borrower
     shall immediately pay to such Issuing Bank or such Lender, from time to
     time as specified by such Issuing Bank or such Lender, additional amounts
     that shall be sufficient to compensate such Issuing Bank or such Lender for
     such increased cost.  A certificate as to the amount of such increased
     cost, submitted to the Borrower by such Issuing Bank or such Lender shall
     be conclusive and binding for all purposes, absent manifest error.

          (ii) The Borrower shall not be obligated to pay any additional
     amounts arising pursuant to this Section 2.13(d) that are attributable to
     the Excluded Period with respect to such additional amounts; provided that
                                                                  --------
     if an applicable law, rule, regulation, guideline or request shall be
     adopted or made on any date and shall be applicable to the period (a
     "Retroactive Period") prior to the date on which such law, rule,
      ------------------
     regulation, guideline or request is adopted or made, the limitation on the
     Borrower's obligation to pay such additional amounts hereunder shall not
     apply to the additional amounts payable in respect of such Retroactive
     Period.

          (e)  Obligations Absolute.  The Obligations of the Borrower under this
               --------------------
Agreement and any other agreement or instrument relating to any Letter of Credit
(as hereafter amended, supplemented or otherwise modified from time to time,
collectively, the "L/C Related Documents") shall, to the extent permitted by
                   ---------------------
law, be unconditional and irrevocable, and shall be paid strictly in accordance
with the terms of such L/C Related Document under all circumstances, including,
without limitation, the following circumstances:

          (i)  any lack of validity or enforceability of any one or more of such
     other documents and agreements, including, but not limited to, the L/C
     Related Documents;

          (ii) any change in the time, manner or place of payment of, or in any
     other term of, all or any of the Obligations of the Borrower in respect of
     any L/C Related Document
<PAGE>

                                      -53-

     or any other amendment or waiver of or any consent to departure from all or
     any of the L/C Related Documents;

          (iii) the existence of any claim, set-off, defense or other right
     that the Borrower may have at any time against any beneficiary or any
     transferee of a Letter of Credit (or any Persons for whom any such
     beneficiary or any such transferee may be acting), any Issuing Bank or any
     other Person, whether in connection with the transactions contemplated by
     the L/C Related Documents or any unrelated transaction;

          (iv)  any statement or any other document presented under a Letter of
     Credit proving to be forged, fraudulent, invalid or insufficient in any
     respect or any statement therein being untrue or inaccurate in any respect;

          (v)   payment by an Issuing Bank under a Letter of Credit against
     presentation of a draft or certificate that does not comply with the terms
     of such Letter of Credit, except to the extent that such payment resulted
     from such Issuing Bank's willful misconduct or gross negligence in
     determining whether such draft or certificate complies on its face with the
     terms of such Letter of Credit;

          (vi)  any exchange, release or nonperfection of any Collateral or
     other collateral, or any release or amendment or waiver of or consent to
     departure from any guarantee, for all or any of the Obligations of the
     Borrower in respect of the L/C Related Documents; or

          (vii) any other circumstance or happening whatsoever, whether or not
     similar to any of the foregoing, including, without limitation, any other
     circumstance that might otherwise constitute a defense available to, or a
     discharge of, the Borrower or a guarantor.

          (f)   NationsBank L/C's.  As of the Restatement Date, the NationsBank
                -----------------
L/C's shall be deemed to have been issued hereunder and shall be considered
Letters of Credit for all purposes hereunder.

          Section 2.14. Replacement of Lenders.
                        ----------------------

          (a)  Subject to clause (c) below, in the event that any Lender
requests compensation pursuant to Section 2.09(a), 2.09(b) or 2.13(d), or the
obligation of any Lender to make, or to Convert Base Rate Advances into, or to
Continue, Eurodollar Rate Advances shall be suspended pursuant to Section
2.09(c) or 2.09(d) (such Lender being herein called an "Affected Lender"), then,
                                                        ---------------
so long as such condition exists, the Borrower may, after the date 30 days after
the date of such request or suspension, either:

          (i)  (x) designate an Eligible Assignee acceptable to the
     Administrative Agent and each Issuing Bank (which acceptance will not be
     unreasonably withheld) that is not an Affiliate of the Borrower (such
     Eligible Assignee being herein called a "Replacement
                                              -----------
<PAGE>

                                      -54-

     Lender") to assume the Affected Lender's Commitment and other obligations
     ------
     hereunder and to purchase the Affected Lender's Advances and other rights
     under the Loan Documents (all without recourse to or representation or
     warranty by, or expense to, the Affected Lender) for a purchase price equal
     to the aggregate principal amount of the outstanding Advances held by the
     Affected Lender plus all accrued but unpaid interest on such Advances and
                     ----
     accrued but unpaid fees owing to the Affected Lender (and upon such
     assumption, purchase and substitution, and subject to the execution and
     delivery to the Administrative Agent by the Replacement Lender of
     documentation satisfactory to the Administrative Agent and compliance with
     the requirements of Section 9.07(c), the Replacement Lender shall succeed
     to the rights and obligations of the Affected Lender hereunder and the
     other Loan Documents), and (y) pay to the Affected Lender all amounts
     payable to such Affected Lender under Section 9.04(c), calculated as if the
     purchase by the Replacement Lender constituted a mandatory prepayment of
     Advances by the Borrower, and (z) pay to the Administrative Agent the
     processing and recordation fee specified in Section 9.07(a)(vi) with
     respect to such assignment; or

          (ii) (x) terminate the Commitment of the Affected Lender and (y) pay
     to the Affected Lender the aggregate principal amount of the outstanding
     Advances held by the Affected Lender plus all accrued but unpaid interest
                                          ----
     on such Advances and accrued but unpaid fees owing to the Affected Lender
     plus all amounts payable to the Affected Lender under Section 9.04(c) as a
     ----
     result of such prepayment.

In the event that the Borrower exercises its rights under the preceding
sentence, the Affected Lender shall no longer be a party hereto or have any
rights or obligations hereunder or under the other Loan Documents; provided that
                                                                   --------
the obligations of the Borrower to the Affected Lender under Sections 2.09, 2.11
and 9.04 with respect to events occurring or obligations arising before or as a
result of such replacement shall survive such exercise.

          (b)  If the Borrower exercises its rights under clause (a)(ii) above,
the Borrower may, not later than the date 60 days after such exercise, designate
an Eligible Assignee acceptable to the Administrative Agent and each Issuing
Bank (which acceptance will not be unreasonably withheld) that is not an
Affiliate of the Borrower (such Eligible Assignee being herein called a
"Substitute Lender") to assume Commitments hereunder and to make Advances
 -----------------
hereunder in an amount equal to the respective Commitments and Advances of the
Affected Lender under each of the Facilities and, subject to (x) the execution
and delivery to the Administrative Agent by the Substitute Lender of
documentation satisfactory to the Administrative Agent, (y) the payment by the
Borrower to the Administrative Agent of the processing and recordation fee
specified in Section 9.07(a)(vi) with respect to such assignment, and (z)
compliance with Section 9.07(c), the Substitute Lender shall succeed to the
rights and obligations of the Affected Lender hereunder and under the other Loan
Documents.  Upon the Substitute Lender so becoming a party hereto, the Borrower
shall borrow Advances from the Substitute Lender and/or prepay the principal of
the Advances of the other Lenders in such manner as will result in the
outstanding principal amount of the Advances being held by the Lenders according
to their respective Pro Rata Shares.
<PAGE>

                                      -55-

          (c)   The Borrower may not exercise its rights under this Section
     2.14:

          (i)   with respect to any Affected Lender unless the Borrower
     simultaneously exercises such rights with respect to all Affected Lenders,

          (ii)  if a Default or an Event of Default has occurred and is then
     continuing, or

          (iii) with respect to any exercise of rights under clause (b) above,
     if, at the time of such exercise, the aggregate amount of the Commitments
     that shall have been terminated pursuant to said clause (b) (including the
     Commitments then proposed to be terminated) shall exceed 30% of the
     aggregate amount of the Commitments in effect on the Restatement Date.

                                  ARTICLE III

                                 CONDITIONS OF
                            RESTATEMENT AND LENDING

          Section 3.01. Conditions Precedent to Amendment and Restatement. The
                        -------------------------------------------------
Existing Credit Agreement shall be amended and restated to read in full
as set forth herein on the date (the "Restatement Date") on which the
                                      ----------------
Administrative Agent shall notify the Company that the Administrative Agent
shall have received the following in form and substance satisfactory to it:

          (a)  This Agreement, duly executed and delivered by each Obligor, the
     Required Lenders and the Administrative Agent.

          (b)  The Notes, duly executed by the Borrower.

          (c)  The following documents, each dated the Restatement Date (unless
     otherwise specified), in form and substance satisfactory to the
     Administrative Agent (unless otherwise specified) and in sufficient copies
     for the Administrative Agent, each Lender and each Issuing Bank:

               (i)  for each Obligor, a copy of the charter, as amended and in
          effect, of such Obligor certified (as of a date reasonably close to
          the Restatement Date) by the Secretary of State of the jurisdiction of
          its organization and a certificate from such Secretary of State dated
          as of a date reasonably close to the Restatement Date as to the good
          standing of and charter documents filed by such Obligor;

               (ii) for each Obligor, a certificate of the Secretary or an
          Assistant Secretary of such Obligor, dated the Restatement Date and
          certifying (A) that attached thereto is a true and complete copy of
          the by-laws of such Obligor as
<PAGE>

                                      -56-

          amended and in effect at all times from the date on which the
          resolutions referred to in clause (B) were adopted to and including
          the date of such certificate, (B) that attached thereto is a true and
          complete copy of resolutions duly adopted by the board of directors of
          such Obligor authorizing the execution, delivery and performance of
          such of the Loan Documents to which such Obligor is or is intended to
          be a party and the extensions of credit hereunder, and that such
          resolutions have not been modified, rescinded or amended and are in
          full force and effect, (C) that the charter of such Obligor has not
          been amended since the date of the certification thereto furnished
          pursuant to clause (i) above, and (D) as to the incumbency and
          specimen signature of each officer of such Obligor executing such of
          the Loan Documents to which such Obligor is intended to be a party and
          each other document to be delivered by such Obligor from time to time
          in connection therewith (and the Administrative Agent and each Lender
          may conclusively rely on such certificate until it receives notice in
          writing from such Obligor); and

               (iii) for each Obligor, a certificate of another officer of such
          Obligor, dated the Restatement Date, as to the incumbency and specimen
          signature of the Secretary or Assistant Secretary, as the case may be,
          of such Obligor.

          (d)  The Holdings Pledge Agreement, the Terra Capital Pledge and
     Security Agreement, the Subsidiary Pledge and Security Agreement and the
     TNLP Pledge and Security Agreement, in substantially the forms of Exhibits
     B-1, B-2, B-3 and B-4, respectively, duly executed by each of the intended
     parties thereto, together with:

               (i)   such appropriately completed and duly executed copies of
          Uniform Commercial Code financing statements and financing statement
          amendments as the Collateral Agent or any Secured Party (as defined in
          the Intercreditor Agreement) shall have requested in order to continue
          the perfection and protection of the Liens created by the Security
          Documents and covering the Collateral described therein;

               (ii)  executed and delivered documents for recordation and filing
          of or with respect to such Security Documents that the Collateral
          Agent or any such Secured Party may deem necessary or desirable in
          order to continue the perfection and protection of the Liens created
          thereby; and

               (iii) legal opinions, in form and substance, and given by
          counsel, satisfactory to the Administrative Agent, confirming that the
          Security Documents are legal, valid, binding and enforceable
          obligations of each Obligor party thereto and that the security
          interests created thereby are a valid first and prior perfected
          security interest in the Collateral.
<PAGE>

                                      -57-

          (e)  The results of a recent search, by a Person satisfactory to the
     Administrative Agent, of Uniform Commercial Code, judgment and tax lien
     filings in each relevant jurisdiction where property of the Obligors is
     located, and the results of such search shall reveal no Liens on any of the
     property of the Obligors except for those permitted under Section 5.02(a)
     or Liens to be discharged on or prior to the Effective Date pursuant to
     documentation satisfactory to the Administrative Agent.

          (f)  A Confirmation of Loan Purchase Agreement in substantially the
     form of Exhibit E, duly executed and delivered by Terra and the
     Administrative Agent.

          (g)  A favorable opinion of Kirkland & Ellis, special counsel for the
     Obligors, substantially in the form of Exhibit D-1 and as to such other
     matters as the Agent, any Issuing Bank or any Lender through the Agent may
     reasonably request.

          (h)  A favorable opinion of Milbank, Tweed, Hadley & McCloy LLP,
     special New York counsel for Citibank, substantially in the form of Exhibit
     D-2.

          (i)  A certificate of the Senior Financial Officer to the effect that:

                    (x)  the representations and warranties contained in each
          Loan Document are correct on and as of the Restatement Date, before
          and after giving effect to the amendment and restatement provided for
          hereby, as though made on and as of such date (or, if any such
          representation or warranty is expressly stated to have been made as of
          a specific date, as of such specific date); and

                    (y)  no event has occurred and is continuing that
          constitutes a Default or an Event of Default.

          (j)  Evidence of payment of (1) all accrued fees and expenses of the
     Administrative Agent (including the reasonable and documented fees and
     expenses of counsel to Citibank in connection with this Agreement to the
     extent that statements for such fees and expenses have been delivered to
     the Borrower at least one Business Day prior to the Restatement Date) and
     (2) all interest accrued through the Restatement Date on the "Advances"
     outstanding under and as defined in the Existing Credit Agreement, all
     accrued commitment fees, all accrued letter of credit fees and all other
     expenses payable thereunder.

          (k)  Evidence of the existence of all insurance required to be
     maintained by Terra hereunder.

          (l)  Evidence that, since December 31, 1998, there has been no
     Material Adverse Change.
<PAGE>

                                      -58-

          (m)  Evidence that the transactions contemplated in the Distribution
     Business Sale Agreement to be consummated on the "Closing Date" (as defined
     therein) have been consummated or are being consummated on the Restatement
     Date, without waiver by Terra in any material respect unless such waiver is
     consented to by the Administrative Agent and the Required Lenders.

          (n)  The existing Terra Canada Credit Facility shall have been amended
     and restated pursuant to the Amended and Restated Credit Agreement dated
     the date hereof among Terra Canada, the lenders parties thereto and
     Citibank, as Administrative Agent, shall have been executed and delivered
     by each of the parties thereto to the Administrative Agent.

          (o)  Evidence that Terra or one or more of its Subsidiaries shall have
     purchased Receivables theretofore sold (by Terra and/or its Subsidiaries)
     under one or more of the Receivables Facilities for an aggregate amount not
     exceeding $150,000,000 and that the Receivables Facilities shall have been
     cancelled in a manner satisfactory to the Administrative Agent.

          (p)  Evidence that Terra or one or more of its Subsidiaries shall have
     purchased the BMLP Class A Limited Partnership Interest from the existing
     BMLP Class A Limited Partner for an amount estimated to be $227,000,000
     (such amount as determined in compliance with the BMLP Partnership
     Agreement, the BMLP Support and Option Agreement and related documents).

          (q)  Evidence that (i) the BMLP Support and Option Agreement and the
     Terra U.K. Offtake Agreement have been cancelled (in the case of the Terra
     U.K. Offtake Agreement with no amounts being paid by Terra and/or any of
     its Subsidiaries in connection therewith (including, without limitation,
     amounts paid subsequent to the Restatement Date)) and (ii) the outstanding
     principal amount of the "Terra Capital Note" as defined in the Existing
     Credit Agreement shall have been paid in full or otherwise cancelled.

          (r)  The following documents, each of which shall be executed (and,
     where appropriate, acknowledged) by Persons satisfactory to the
     Administrative Agent:

               (i)  The Terra Oklahoma Mortgage, the BMLP Mortgage and the Port
          Neal Corporation Mortgage, each in substantially the forms of Exhibit
          B-5, duly executed by each of the intended parties thereto, covering
          the facilities of the Company and its Subsidiaries located in
          Woodward, Oklahoma, Port Neal, Iowa and Beaumont, Texas, in each case
          duly executed and delivered by the intended parties thereto in
          recordable form (in such number of copies as the Administrative Agent
          shall have requested) and, to the extent necessary with respect to any
          leasehold property to be subjected to a Mortgage, consents of the
          respective landlords with respect to such property; and
<PAGE>

                                      -59-

               (ii) to the extent necessary under applicable law, for filing in
          the appropriate county land office, Uniform Commercial Code financing
          statements covering fixtures, appropriately completed and duly
          executed.

          (s)  A Liquid Asset Coverage Certificate as of the Restatement Date.

          (t)  Such other approvals, opinions and documents relating to this
     Agreement and the transactions contemplated hereby as any Lender or any
     Issuing Bank may, through the Administrative Agent, reasonably request.

          Section 3.02. Conditions Precedent to Each Borrowing and Issuance.
                        ---------------------------------------------------
The obligation of each Lender to make an Advance on the occasion of each
Borrowing (excluding, however, the making of any Advance pursuant to Section
2.13), and the right of the Borrower to request the issuance of Letters of
Credit, shall be subject to the further conditions precedent that on the date of
such Borrowing or issuance the following statements shall be true (and each of
the giving of the applicable Notice of Borrowing or Notice of Issuance and the
acceptance by the Borrower of the proceeds of such Borrowing or of such Letter
of Credit shall constitute a representation and warranty by the Borrower that on
the date of such Borrowing or issuance such statements are true):

          (i)   the representations and warranties contained in each Loan
     Document are correct on and as of the date of such Borrowing or issuance,
     before and after giving effect to such Borrowing or issuance and to the
     application of the proceeds therefrom, as though made on and as of such
     date (or, if any such representation or warranty is expressly stated to
     have been made as of a specific date, as of such specific date);

          (ii)  no event has occurred and is continuing, or would result from
     such Borrowing or issuance or from the application of the proceeds
     therefrom, that constitutes a Default or an Event of Default; and

          (iii) if the date of such Borrowing or issuance is a Liquid Asset
     Coverage Date, the Adjusted Liquid Asset Coverage Amount as of such date is
     not less than the Aggregate Outstanding Exposure as of such date
     (determined after giving effect to the making of such Advances or the
     issuance of such Letter of Credit).

          Section 3.03. Determinations Under Section 3.01. For purposes of
                        ---------------------------------
determining compliance with the conditions specified in Section 3.01, each
Lender shall be deemed to have consented to, approved or accepted or to be
satisfied with each document or other matter required thereunder to be consented
to or approved by or acceptable or satisfactory to the Lenders unless an officer
of the Administrative Agent responsible for the transactions contemplated by the
Loan Documents shall have received notice from such Lender prior to the
Restatement Date specifying its objection thereto.
<PAGE>

                                      -60-

          Section 3.04. Consent to Sale.  Effective as of the Restatement Date,
                        ---------------
the Initial Lenders hereby consent to the sale by Terra of the Distribution
Business on the terms and conditions as set forth in the Distribution Business
Sale Agreement.

          Section 3.05. Terra Consents.  Each Obligor hereby acknowledges that
                        --------------
each of the Terra Capital Security Documents continues unchanged and remains in
full force and effect to secure (as "Secured Obligations" as defined therein)
the obligations of the Obligors hereunder.

                                  ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES

          Section 4.01. Representations and Warranties of the Company. The
                        ---------------------------------------------
Company represents and warrants as follows:

          (a)  Each Obligor (i) is a corporation (or, in the cases of TNLP and
     BMLP, a limited partnership) duly organized, validly existing and in good
     standing under the laws of the jurisdiction of its organization, (ii) is
     duly qualified and in good standing as a foreign corporation (or limited
     partnership, as the case may be) in each other jurisdiction in which it
     owns or leases property or in which the conduct of its business requires it
     to so qualify or be licensed and where, in each case, failure so to qualify
     and be in good standing could reasonably be expected to have a Material
     Adverse Effect and (iii) has all requisite power (corporate or other) and
     authority to own or lease and operate its properties and to carry on its
     business as now conducted and as proposed to be conducted.

          (b)  Set forth on Schedule 4.01(b) is a complete and accurate list of
     all Material Subsidiaries of each Obligor as of the Restatement Date,
     showing as of such date (as to each such Subsidiary) the jurisdiction of
     its organization, the number of shares of each class of capital stock or
     partnership interests authorized, and the number outstanding and the
     percentage of the outstanding shares or interests of each such class owned
     (directly or indirectly) by such Obligor and the number of shares covered
     by all outstanding options, warrants, rights of conversion or purchase and
     similar rights. All of the outstanding capital stock or partnership
     interests of all of such Subsidiaries has been validly issued, is fully
     paid and non-assessable and is owned by such Obligor or one or more of its
     Subsidiaries free and clear of all Liens, except those created by the
     Security Documents. Each Material Subsidiary (i) is a corporation (or, in
     the cases of TNLP and BMLP, a limited partnership) duly organized, validly
     existing and in good standing under the laws of the jurisdiction of its
     organization, (ii) is duly qualified and in good standing as a foreign
     corporation or limited partnership, as the case may be, in each other
     jurisdiction in which it owns or leases property or in which the conduct of
     its business requires it to so qualify or be licensed and where, in each
     case, failure to so qualify and be in good standing could reasonably be
     expected to have a Material Adverse Effect and (iii) has all requisite
     power (corporate or other) and authority to own or lease and operate its
<PAGE>

                                      -61-


          properties and to carry on its business as now conducted and as
          proposed to be conducted.

               (c)  The execution, delivery and performance by each Obligor of
          this Agreement, the Notes and each other Loan Document to which it is
          or is intended to be a party, and the consummation of the credit
          transactions between Borrower and Lenders contemplated hereby, are
          within such Obligor's powers (corporate or other), have been (or will,
          prior to the Restatement Date, be) duly authorized by all necessary
          corporate or other action, and do not (i) contravene such Obligor's
          charter, by-laws or, in the cases of TNLP and BMLP, its agreement of
          limited partnership, (ii) violate any applicable law (including,
          without limitation, the Securities Exchange Act of 1934 and the
          Racketeer Influenced and Corrupt Organizations Chapter of the
          Organized Crime Control Act of 1970), rule, regulation (including,
          without limitation, Regulation U and Regulation X), order, writ,
          judgment, injunction, decree, determination or award (except for any
          such violation, by action or inaction of any Obligor, that could not
          reasonably be expected to have a Material Adverse Effect and that
          could not result in any liability of any Lender), (iii) except as set
          forth on Schedule 4.01(c), conflict with or result in the breach of,
          or constitute a default under, any contract, loan agreement,
          indenture, mortgage, deed of trust, lease or other instrument binding
          on or affecting any Obligor, any of its Subsidiaries or any of their
          properties (except for any such conflict, breach or default, caused by
          action or inaction of any Obligor, that could not reasonably be
          expected to have a Material Adverse Effect and that could not result
          in any liability of any Lender) or (iv) except for the Liens created
          by the Security Documents, result in or require the creation or
          imposition of any Lien upon or with respect to any of the properties
          of any Obligor or any of its Subsidiaries. No Obligor or any of its
          Subsidiaries is in violation of any such law, rule, regulation, order,
          writ, judgment, injunction, decree, determination or award or in
          breach of any such contract, loan agreement, indenture, mortgage, deed
          of trust, lease or other instrument, the violation or breach of which
          could be reasonably expected to have a Material Adverse Effect.

               (d)  No authorization or approval or other action by, and no
          notice to or filing with, any governmental authority or regulatory
          body or any other third party is required for (i) the due execution,
          delivery, recordation, filing or performance by any Obligor of this
          Agreement, the Notes or any other Loan Document to which it is or is
          to be a party, or for the consummation of the credit transactions
          between Borrower and Lenders contemplated hereby, (ii) the grant by
          any Obligor of the Liens granted by it pursuant to the Security
          Documents, (iii) the perfection or maintenance of the Liens created by
          the Security Documents (except for the filings required to be made
          pursuant to Section 3.01(d)) or (iv) the exercise by the Collateral
          Agent, the Administrative Agent, any Lender or Issuing Bank or any
          other Secured Party (as defined in the Security Documents) of its
          rights under the Loan Documents or the remedies in respect of the
          Collateral pursuant to the Security Documents, except for the
          authorizations, approvals, actions, notices and filings listed on
          Schedule 4.01(d), all of which have been duly obtained, taken, given
          or made and are in full force and effect.
<PAGE>

                                      -62-

               (e)  This Agreement has been, and each of the Notes and each
          other Loan Document when delivered will have been, duly executed and
          delivered by each Obligor that is intended to be a party thereto. This
          Agreement is, and each of the Notes and each other Loan Document when
          delivered will be, the legal, valid and binding obligation of each
          Obligor that is intended to be a party thereto, enforceable against
          such Obligor in accordance with its terms.

               (f)  The balance sheet of Terra as at December 31, 1998 and the
          related statements of income and cash flows of Terra for the twelve
          months then ended, accompanied by an opinion of Deloitte & Touche,
          independent public accountants, and the balance sheet of Terra as at
          March 31, 1999 and the related statements of income and cash flows of
          Terra for the three months then ended, duly certified by the chief
          financial officer of Terra, copies of which have been furnished to
          each Lender, present fairly, in all material respects, subject, in the
          case of said balance sheet as at March 31, 1999, and said statements
          of income and cash flows for the three months then ended, to year-end
          audit adjustments, the financial condition of Terra as at such dates
          and the results of the operations of Terra for the periods ended on
          such dates, all in accordance with generally accepted accounting
          principles applied on a consistent basis. Since December 31, 1998,
          there has been no Material Adverse Change with respect to Terra.

               (g)  (A) No written information, exhibit or report (as at the
          Restatement Date) furnished by any officer of Terra to the
          Administrative Agent, any Issuing Bank or any Lender in connection
          with the negotiation of the Loan Documents (when taken together)
          contained any untrue statement of a material fact or omitted to state
          a material fact necessary to make the statements made therein not
          misleading and (B) none of the information, exhibits or reports
          furnished by any Obligor to the Administrative Agent, any Issuing Bank
          or any Lender pursuant to Section 5.03 contained (on the date of
          delivery thereof) any untrue statement of a material fact or omitted
          to state a material fact necessary to make the statements made therein
          not misleading; provided that the representations made in this Section
                          --------
          4.01(g) with respect to the U.K. Nitrogen Assets with respect to any
          time prior to December 31, 1997 are made to the best of Terra's
          knowledge after due inquiry.

               (h)  There is no action, suit, litigation or proceeding against
          any Obligor or any of its Subsidiaries or any of their respective
          property, including any Environmental Action, pending before any
          court, governmental agency or arbitrator, or (to the knowledge of any
          Obligor) threatened, nor (to the knowledge of any Obligor) is there
          any investigation pending in respect of any Obligor, that:

                    (1)  could reasonably be expected to have a Material Adverse
               Effect; or
<PAGE>

                                      -63-

                    (2)  on the Restatement Date could reasonably be expected to
               affect the legality, validity or enforceability of this
               Agreement, any Note, any other Loan Document or the consummation
               of the transactions contemplated hereby.

               (i)  No Obligor is engaged in the business of extending credit
          for the purpose of purchasing or carrying Margin Stock, and no
          proceeds of any Advance will be used for any purpose which violates
          the provisions of the regulations of the Board of Governors of the
          Federal Reserve System. After applying the proceeds of each Advance,
          not more than 25% of the value of the assets of the Borrower and of
          the Borrower and its Subsidiaries taken as a whole (as determined in
          good faith by the Borrower) that are subject to Section 5.02(a) or
          Section 5.02(e) will consist of or be represented by Margin Stock. If
          requested by any Lender or the Administrative Agent, the Borrower will
          furnish to the Administrative Agent and each Lender a statement in
          conformity with the requirements of Federal Reserve Form U-1 referred
          to in Regulation U, the statements made in which shall be such, in the
          opinion of each Lender, as to permit the transactions contemplated
          hereby in accordance with Regulation U.

               (j)  Set forth on Schedule 4.01(j) is a complete and accurate
          list, as of the Restatement Date, of each Plan that is subject to
          Title IV of ERISA and each Multiemployer Plan with respect to any
          employees or former employees of any Obligor or any of its ERISA
          Affiliates.

               (k)  No ERISA Event has occurred or is reasonably expected to
          occur with respect to any Plan of any Obligor or any of its ERISA
          Affiliates that could reasonably be expected to have a Material
          Adverse Effect.

               (l)  Since the date of the Schedule B (Actuarial Information) to
          the most recent annual report (Form 5500 Series) for each Plan of any
          Obligor or any of its ERISA Affiliates, there has been no change in
          the funding status of any such Plan except to the extent that such
          change is not reasonably expected to have a Material Adverse Effect.

               (m)  Neither any Obligor nor any of its ERISA Affiliates has
          incurred or is reasonably expected to incur any withdrawal liability
          to any Multiemployer Plan except to the extent such withdrawal
          liability is not reasonably expected to have a Material Adverse
          Effect.

               (n)  Neither any Obligor nor any of its ERISA Affiliates has been
          notified by the sponsor of a Multiemployer Plan of any Obligor or any
          of its ERISA Affiliates that such Multiemployer Plan is in
          reorganization or has been terminated, within the meaning of Title IV
          of ERISA.

               (o)  As of the Restatement Date, the aggregate annualized cost on
          a pay-as-you-go basis (including, without limitation, the cost of
          insurance premiums) with respect to post-retirement benefits under
          welfare plans (other than post-retirement benefits required
<PAGE>

                                      -64-

          to be provided by Section 4980B of the Code or applicable state law)
          for which Terra and its Subsidiaries is liable does not exceed
          $1,000,000.

               (p)  Neither the business nor the properties of any Obligor or
          any of its Subsidiaries are affected by any fire, explosion, accident,
          strike, lockout or other labor dispute, drought, storm, hail,
          earthquake, embargo, act of God or of the public enemy or other
          casualty (whether or not covered by insurance) that could reasonably
          be expected to have a Material Adverse Effect.

               (q)  Except as set forth on Part I of Schedule 4.01(q) and except
          to the extent any of the following could not reasonably be expected to
          have a Material Adverse Effect, the operations and properties of each
          Obligor and each of its Subsidiaries comply in all material respects
          with all Environmental Laws, all necessary Environmental Permits have
          been obtained and are in effect for the operations and properties of
          each Obligor and its Subsidiaries, each Obligor and its Subsidiaries
          are in compliance in all material respects with all such Environmental
          Permits, and no circumstances exist that could (i) form the basis of
          an Environmental Action against any Obligor or any of its Subsidiaries
          or (ii) cause any such property to be subject to any material
          restrictions on ownership, occupancy, use or transferability under any
          Environmental Law.

               (r)  Except as set forth on Part II of Schedule 4.01(q) and
          except to the extent any of the following could not reasonably be
          expected to have a Material Adverse Effect, as of the Restatement Date
          none of the properties of any Obligor or any of its Subsidiaries is
          listed or proposed for listing on the National Priorities List under
          CERCLA or on the Comprehensive Environmental Response, Compensation
          and Liability Information System maintained by the Environmental
          Protection Agency or any analogous state list of sites requiring
          investigation or cleanup, and no underground storage tanks, as such
          term is defined in 42 U.S.C. 6901, are located on any property of any
          Obligor or any of its Subsidiaries.

               (s)  Except as set forth on Part III of Schedule 4.01(q) and
          except to the extent any of the following could not reasonably be
          expected to have a Material Adverse Effect, as of the Restatement Date
          neither any Obligor nor any of its Subsidiaries has been notified in
          writing by any federal, state or local governmental agency or any
          other Person that any Obligor or any of its Subsidiaries is
          potentially liable for the remedial or other costs with respect to
          treatment, storage, disposal, release, arrangement for disposal or
          transportation of any Hazardous Materials generated by any Obligor or
          any of its Subsidiaries, and Hazardous Materials have not been
          generated, used, treated, handled, stored or disposed of on, or
          released or transported to or from, any property of such Obligor (or,
          to its knowledge, any adjoining property) except in compliance in all
          material respects with all Environmental Laws and Environmental
          Permits, and all other wastes generated at any such properties by any
          Obligor or any of its Subsidiaries (and their respective agents,
          employees and contractors) have been disposed of in compliance with
          all Environmental Laws and Environmental Permits.
<PAGE>

                                      -65-

               (t)  Each Obligor and each of its Subsidiaries has filed, has
          caused to be filed or has been included in, all federal and state
          income tax returns and all other material tax returns (federal, state,
          local and foreign) required to be filed and has paid (or is contesting
          in good faith by appropriate proceedings) all taxes shown thereon to
          be owing, together with applicable interest and penalties.

               (u)  Set forth on Schedule 4.01(u) is a complete and accurate
          list, as of the date hereof, of each taxable year of Terra for which
          federal income tax returns have been filed and for which the
          expiration of the applicable statute of limitations for assessment or
          collection has not occurred by reason of extension or otherwise (an
          "Open Year").
           ---------

               (v)  As of the Restatement Date, there are no adjustments to the
          federal income tax liability of Terra proposed by the Internal Revenue
          Service with respect to Open Years. No issues have been raised by the
          Internal Revenue Service in respect of Open Years that, in the
          aggregate, could reasonably be expected to have a Material Adverse
          Effect.

               (w)  Neither any Obligor nor any of its Subsidiaries is an
          "investment company," or an "affiliated person" of, or "promoter" or
          "principal underwriter" for, an "investment company," as such terms
          are defined in the Investment Company Act of 1940, as amended. Neither
          any Obligor nor any of its Subsidiaries is a "holding company", or an
          "affiliate" of a "holding company" or a "subsidiary company" of a
          "holding company", within the meaning of the Public Utility Holding
          Company Act of 1935, as amended. Neither the making of any Advances,
          nor the issuance of any Letters of Credit, nor the application of the
          proceeds or repayment thereof by the Borrower, nor the consummation of
          the other transactions contemplated hereby, will violate any provision
          of such Act or any rule, regulation or order of the Securities and
          Exchange Commission thereunder.

               (x)  Each of Terra and the Company (both individually and
          collectively with their respective Subsidiaries) is Solvent.

               (y)  Set forth on Part I of Schedule 4.01(y) is a complete and
          accurate list, as of the Restatement Date, of all existing Debt of
          each Obligor, showing as of the Restatement Date (i) the principal
          amount outstanding thereunder, (ii) whether such Debt is secured by
          any Lien and (iii) the aggregate principal amount of such Debt
          scheduled to be paid during each fiscal year of Terra to and including
          the fiscal year of Terra in which the Commitment Termination Date is
          scheduled to occur.

               (z)  The Borrower has (i) initiated a review and assessment of
          all areas within its and each of its Subsidiaries' business and
          operations that could be adversely affected by the inability of the
          computer applications used by the Borrower or any of its Subsidiaries
          to recognize and perform properly date-sensitive functions involving
          certain dates prior to, on and on any date after December 31, 1999
          (the "Year 2000 Problem"), (ii)
                -----------------
<PAGE>

                                      -66-

          developed a plan and timeline for addressing the Year 2000 Problem on
          a timely basis, and (iii) to date, implemented that plan substantially
          in accordance with the timetable. Based on the foregoing, the Borrower
          believes that all computer applications that are material to its or
          any of its Subsidiaries' business and operations are reasonably
          expected on a timely basis to be able to perform properly date-
          sensitive functions for all dates before, on and after January 1,
          2000, except to the extent that a failure to do so could not
          reasonably be expected to have a Material Adverse Effect.

               Section 4.02.  Representations and Warranties of each Lender.
                              ---------------------------------------------
Each Lender hereby represents and warrants that such Lender, in good faith, has
not relied upon Margin Stock as collateral for the Obligations of the Obligors
hereunder and under the other Loan Documents.


                                   ARTICLE V

                              COVENANTS OF TERRA

               Section 5.01.  Affirmative Covenants. So long as any principal of
                              ---------------------
or interest on any Advance or any other amount payable under this Agreement
shall remain unpaid, any Letter of Credit shall be outstanding or any Lender
shall have any Commitment hereunder, Terra will, and will cause each of the
Obligors to:

               (a)  Compliance with Laws, Etc. Comply, and cause each of its
                    -------------------------
          Subsidiaries to comply, with all applicable laws, rules, regulations
          and orders, such compliance to include, without limitation, compliance
          with ERISA and the Racketeer Influenced and Corrupt Organizations
          Chapter of the Organized Crime Control Act of 1970 (except to the
          extent that non-compliance with any thereof could not reasonably be
          expected to have a Material Adverse Effect).

               (b)  Payment of Taxes, Etc. Pay and discharge, and cause each of
                    ---------------------
          its Subsidiaries to pay and discharge, before the same shall become
          delinquent, (i) all taxes, assessments and governmental charges or
          levies imposed upon it or upon its property and (ii) all lawful claims
          that, if unpaid, might by law become a Lien upon its property;
          provided that neither such Obligor nor any of its Subsidiaries shall
          --------
          be required to pay or discharge any such tax, assessment, charge or
          claim that is being contested in good faith and by proper proceedings
          and as to which appropriate reserves are being maintained to the
          extent required by GAAP, unless and until any Lien resulting therefrom
          attaches to its property and becomes enforceable against its other
          creditors.

               (c)  Compliance with Environmental Laws. Comply, and cause each
                    ----------------------------------
          of its Subsidiaries and all lessees and other Persons occupying its
          properties to comply, with all Environmental Laws and Environmental
          Permits applicable to its operations and properties; obtain and renew,
          and cause each of its Subsidiaries to obtain and renew, all
          Environmental Permits necessary for its operations and properties; and
          conduct, and
<PAGE>

                                      -67-

          cause each of its Subsidiaries to conduct, any investigation, study,
          sampling and testing, and undertake any cleanup, removal, remedial or
          other action necessary to remove and clean up all Hazardous Materials
          from any of its properties, in accordance with the requirements of all
          Environmental Laws; provided that (i) neither such Obligor nor any of
                              --------
          its Subsidiaries shall be required to undertake any such cleanup,
          removal, remedial or other action to the extent that its obligation to
          do so is being contested in good faith and by proper proceedings and
          appropriate reserves to the extent required by GAAP are being
          maintained with respect to such circumstances and (ii) no such
          compliance with laws and permits, obligation to obtain or renew
          permits or obligation to undertake any such investigation, study,
          sampling, testing, removal, remedial or other action shall be required
          hereunder to the extent no Material Adverse Effect could reasonably be
          expected to result from any failure to so comply, obtain, renew or
          undertake, either individually or in the aggregate.

               (d)  Maintenance of Insurance. Maintain, and cause each of its
                    ------------------------
          Material Subsidiaries to maintain, with responsible and reputable
          insurance companies or associations, insurance, including business
          interruption insurance with respect to each manufacturing plant, in
          such amounts and covering such risks as is usually carried by
          companies engaged in similar businesses.

               (e)  Preservation of Corporate Existence, Etc. Subject to Section
                    ----------------------------------------
          5.02(d) and (e), preserve and maintain, and cause each of its Material
          Subsidiaries to preserve and maintain, its corporate or partnership
          existence, rights (charter and statutory) and franchises; provided
                                                                    --------
          that:

                    (1)  BMLP may be dissolved; and

                    (2)  neither any Obligor nor any of its Subsidiaries shall
               be required to preserve any right or franchise if the Board of
               Directors of such Obligor or such Subsidiary shall determine that
               the preservation thereof is no longer desirable in the conduct of
               the business of such Obligor or such Subsidiary, as the case may
               be, and that the loss thereof will not have a Material Adverse
               Effect.

               (f)  Visitation Rights. At any reasonable time and as may be
                    -----------------
          reasonably requested from time to time, permit the Administrative
          Agent, any Issuing Bank or any of the Lenders or any agents or
          representatives thereof to examine and make copies of and abstracts
          from the records and books of account of, and visit the properties of,
          such Obligor and any of its Subsidiaries (in the presence of an
          appropriate officer or representative of the relevant Obligor), and to
          discuss the affairs (including, but not limited to, the compliance by
          such Obligor and its Subsidiaries with all Environmental Laws),
          finances and accounts of such Obligor and any of its Subsidiaries with
          any of their officers or directors and with their independent
          certified public accountants.
<PAGE>

                                      -68-

               (g)  Preparation of Environmental Reports. Upon either (i) the
                    ------------------------------------
          acquisition of any real property by such Obligor or any of its
          Subsidiaries the purchase price of which exceeds $1,000,000 or (ii)
          the occurrence and during the continuance of a Default or Event of
          Default arising under Section 5.01(c), and in each case at the written
          request of the Administrative Agent, such Obligor shall provide to the
          Administrative Agent within a reasonable time after such acquisition
          or request, as the case may be, at the expense of such Obligor, an
          environmental site assessment report for the acquired property (in the
          case of an acquisition as described in clause (i)) or for any
          properties of such Obligor which are the subject of any such Default
          or Event of Default (in the case of an event as described in clause
          (ii)) prepared by an environmental consulting firm reasonably
          acceptable to the Administrative Agent, indicating the presence or
          absence of Hazardous Materials and the estimated cost of any
          compliance, removal or remedial action in connection with any
          Hazardous Materials on such properties (provided that if such Obligor,
                                                  --------
          in the exercise of its reasonable judgment, determines not to have
          such an environmental site assessment report prepared, such Obligor
          shall instead deliver to the Administrative Agent a copy of such
          Obligor's internal site assessment report relating to relevant
          property). Without limiting the generality of the foregoing, if the
          Administrative Agent determines at any time that a material risk
          exists that any such report will not be provided within a reasonable
          time following such request, the Administrative Agent may retain an
          environmental consulting firm to prepare such report at the expense of
          such Obligor, such Obligor and each of its Subsidiaries hereby
          granting to the Administrative Agent, such firm and any agents or
          representatives thereof an irrevocable non-exclusive license, subject
          to the rights of tenants, to enter onto its properties to undertake
          such an assessment.

               (h)  Keeping of Books. Keep, and cause each of its Material
                    ----------------
          Subsidiaries to keep, proper books of record and account, in which
          full and correct entries shall be made of all financial transactions
          and the assets and business of such Obligor and each such Subsidiary
          in accordance with GAAP.

               (i)  Maintenance of Properties, Etc. Maintain and preserve, and
                    ------------------------------
          cause each of its Material Subsidiaries to maintain and preserve,
          except to the extent the failure to do so could not reasonably be
          expected to have a Material Adverse Effect, all of its properties that
          are used or useful in the conduct of its business in good working
          order and condition, ordinary wear and tear excepted.

               (j)  Compliance with Terms of Leaseholds. Make all payments and
                    -----------------------------------
          otherwise perform all obligations in respect of all leases of real
          property, keep such leases in full force and effect and not allow such
          leases to lapse or be terminated or any rights to renew such leases to
          be forfeited or canceled, except to the extent any such lease is no
          longer used or useful in the conduct of its business or which, in the
          exercise of the reasonable judgment of the relevant Obligor, is to be
          refinanced and except to the extent failure to comply with the
          foregoing would not have a Material Adverse Effect, and cause each of
          its Material Subsidiaries to do so.
<PAGE>

                                      -69-

               (k)  Performance and Compliance with Material Contracts. Perform
                    --------------------------------------------------
          and observe, and cause each of its Subsidiaries to perform and
          observe, all the terms and provisions of each Material Contract to be
          performed or observed by it, maintain each such Material Contract in
          full force and effect and enforce each such Material Contract in
          accordance with its terms, except to the extent the failure to do any
          of the foregoing could not reasonably be expected to have a Material
          Adverse Effect.

               (l)  Transactions with Affiliates. Conduct, and cause each of its
                    ----------------------------
          Subsidiaries to conduct, all transactions otherwise permitted under
          the Loan Documents with any of its Affiliates on terms that are fair
          and reasonable and no less favorable to such Obligor or such
          Subsidiary than would obtain in a comparable arm's-length transaction
          with a Person that is not an Affiliate; provided that this Section
                                                  --------
          5.01(l) shall not be applicable to:

                         (i)   transactions between such Obligor and wholly
               owned Subsidiaries of Terra or between wholly owned Subsidiaries
               of Terra unless otherwise prohibited by this Agreement;

                         (ii)  compensation paid for services rendered by any
               director or officer of such Obligor or any director or officer of
               a Subsidiary of such Obligor serving at the direction or request
               of such Obligor to the extent such compensation is determined in
               the good faith exercise of business judgment by the Board of
               Directors of such Obligor to be reasonable and appropriate to the
               functions of such office;

                         (iii) transactions under Intercompany Receivables
               Facilities; and

                         (iv)  transactions under the Management Agreements.

               (m)  Further Assurances. (i) Promptly upon reasonable request by
                    ------------------
          the Administrative Agent or any Lender or Issuing Bank through the
          Administrative Agent, correct, and cause each Subsidiary promptly to
          correct, any material defect or error that may be discovered in any
          Loan Document, which material defect or error is the result of any
          untrue statement of material fact under any Loan Document or the
          omission to state a material fact necessary to make the statements
          made therein not misleading, or in the execution, acknowledgment or
          recordation of any Loan Document, (ii) promptly upon reasonable
          request by the Collateral Agent, the Administrative Agent or any
          Lender or Issuing Bank through the Administrative Agent do, execute,
          acknowledge, deliver, record, re-record, file, re-file, register and
          re-register, and cause any such Subsidiary promptly to do, execute,
          acknowledge, deliver, record, re-record, file, re-file, register and
          re-register, any and all such further acts, deeds, conveyances, pledge
          agreements, assignments, financing statements and continuations
          thereof, termination statements, notices of assignment, transfers,
          certificates, assurances and other instruments as the Collateral
          Agent, the Administrative Agent or any Lender or Issuing Bank through
          the
<PAGE>

                                      -70-

          Administrative Agent may reasonably require from time to time in order
          to (A) subject to the Liens created by any of the Security Documents
          any of such Obligor's and its Subsidiaries' properties, rights or
          interests covered or now or hereafter intended to be covered by any of
          the Security Documents, (B) perfect and maintain the validity,
          effectiveness and priority of any of the Security Documents and the
          Liens intended to be created thereby and (C) assure, convey, grant,
          assign, transfer, preserve, protect and confirm more effectively unto
          the Collateral Agent the rights granted or now or hereafter intended
          to be granted to it under any Security Document or under any other
          instrument executed in connection with any Security Document to which
          such Obligor, any other Obligor or any of their respective
          Subsidiaries is or may become a party and (iii) (1) in the event that
          the Company or any of its Subsidiaries (other than a Foreign
          Subsidiary) shall form or acquire any new Subsidiary (other than a
          Foreign Subsidiary), the Company and its Subsidiaries will cause such
          new Subsidiary to (x) become a "Subsidiary Guarantor" hereunder and a
          "Grantor" under the Subsidiary Pledge and Security Agreement pursuant
          to documentation in form and substance satisfactory to the
          Administrative Agent and the Collateral Agent, (y) cause such new
          Subsidiary to take such action (including, without limitation,
          delivering such shares of stock and executing and delivering such
          Uniform Commercial Code financing statements) as shall be necessary to
          create and perfect valid and enforceable first priority Liens on
          substantially all of the personal property and, upon the request of
          the Administrative Agent, any material real estate of such new
          Subsidiary as collateral security for the obligations of such new
          Subsidiary hereunder and (z) deliver such proof of corporate action,
          incumbency of officers, opinions of counsel and other documents as is
          consistent with those delivered by each Obligor pursuant to Section
          3.01 on the Restatement Date or as the Administrative Agent shall have
          requested and (2) in the event that the Company or any of its
          Subsidiaries (other than a Foreign Subsidiary and any member of the
          Terra Canada Group) shall form or acquire any new Subsidiary, the
          Company shall take such action as shall be necessary to ensure that
          all of the stock or other ownership interests of such new Subsidiary
          are pledged to the Collateral Agent pursuant to the Subsidiary Pledge
          and Security Agreement, provided that in no event shall more than 65%
                                  --------
          of the stock or other ownership interests of any such Subsidiary that
          is a Foreign Subsidiary be required to be pledged pursuant to this
          clause (m).

               (n)  Ownership of the Obligors. Take, and will cause each of its
                    -------------------------
          Subsidiaries to take, such action from time to time as shall be
          necessary to ensure that:

                         (i)   Terra will at all times own, beneficially and of
               record, all of the issued and outstanding capital stock (other
               than directors' qualifying shares) of Terra Capital Holdings;

                         (ii)  Terra Capital Holdings will at all times own,
               beneficially and of record, all of the issued and outstanding
               capital stock (other than directors' qualifying shares) of the
               Company, and will own no other property (other than
<PAGE>

                                      -71-

               (x) cash, (y) other property incidental to its business as a
               holding company and (z) capital stock of, or other ownership
               interests in, Receivables Subsidiaries);

                         (iii) the Company will at all times own:

                               (1) beneficially and of record, all of the issued
                         and outstanding capital stock (other than directors'
                         qualifying shares) of TI, BMCH, TMC and TNC and

                               (2) no other property, other than:

                                     (A)  cash and Permitted Investments,

                                     (B)  Receivables of one or more of its
                               Subsidiaries transferred to it, and capital stock
                               of, or other ownership interests in, Receivables
                               Subsidiaries,

                                     (C)  Senior Preference Units purchased
                               pursuant to the SPU Redemption, and capital stock
                               of a wholly owned Subsidiary of the Company
                               organized for the purpose of holding such Senior
                               Preference Units,

                                     (D)  other property incidental to its
                               business as a holding company,

                                     (E)  other property used solely in
                               connection with its performance of services
                               pursuant to the terms of the Management
                               Agreements,

                                     (F)  the TNLP Notes and

                                     (G)  other Investments permitted to be held
                               by the Company pursuant to Section 5.02(f) (to
                               the extent such Investments, in the case of those
                               made under clauses (iv), (v) and (vi) of said
                               Section 5.02(f), are subject to the Lien of the
                               Security Documents); and

                        (iv)   TNCLP will at all times own no property other
               than ownership interests of TNLP and its successors (other than
               cash, Senior Preference Units purchased pursuant to the SPU
               Redemption and other property incidental to its business as a
               holding company).

          In the event that any such additional shares of stock or other
          ownership interests shall be issued to an Obligor by any domestic
          Subsidiary or first tier Foreign Subsidiary thereof,
<PAGE>

                                      -72-

          the respective Obligor agrees forthwith to deliver to the Collateral
          Agent pursuant to the Security Documents the certificates (if any)
          evidencing such ownership interests accompanied by undated powers
          executed in blank and to take such other action as the Collateral
          Agent or the Administrative Agent shall request to perfect the
          security interest created therein pursuant to the Security Documents,
          provided that in no event shall such Obligor be required to pledge
          --------
          more than 65% of the stock or other ownership interests of any Foreign
          Subsidiary thereof. Without limiting the foregoing, neither TNCLP nor
          TNLP shall convert to a corporate form except pursuant to the SPU
          Redemption.

               (o)  Delivery of Management Agreements. On or prior to the date
                    ---------------------------------
          of execution of each Management Agreement, notify the Administrative
          Agent thereof (and the Administrative Agent shall notify the Lenders
          thereof promptly) and shall deliver to the Administrative Agent a
          certified copy thereof (each such Management Agreement to be in form
          and substance reasonably satisfactory to the Administrative Agent).
          Promptly following each amendment, waiver and consent relating to a
          Management Agreement (but subject to Section 5.02(p)), Terra shall
          give the Administrative Agent notice thereof (and the Administrative
          Agent shall notify the Lenders thereof promptly), and shall deliver to
          the Administrative Agent a certified or conformed copy of each such
          amendment, waiver and consent.

               Section 5.02.  Negative Covenants. So long as any principal of or
                              ------------------
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of Credit shall be outstanding or any Lender shall
have any Commitment hereunder, Terra will not, and will not permit any of its
Material Subsidiaries to:

               (a)  Liens, Etc. Create, incur, assume or suffer to exist, or
                    ----------
          permit any of its Material Subsidiaries to create, incur, assume or
          suffer to exist, any Lien on or with respect to any of its properties
          of any character (including, without limitation, accounts) whether now
          owned or hereafter acquired, or sign or file, or permit any of its
          Subsidiaries to sign or file, under the Uniform Commercial Code of any
          jurisdiction, a financing statement that names such Obligor or any of
          its Subsidiaries as debtor, or sign, or permit any of its Subsidiaries
          to sign, any security agreement authorizing any secured party
          thereunder to file such financing statement, or assign, or permit any
          of its Subsidiaries to assign, any accounts or other right to receive
          income, excluding from the operation of the foregoing restrictions the
                  ---------
          following:

                    (i)   Liens created by the Loan Documents;

                    (ii)  Permitted Liens; Liens in favor of banks which arise
               under Article 4 of the Uniform Commercial Code on items in
               collection and documents relating thereto and proceeds thereof;
               and Liens in favor of customs and revenue authorities arising as
               a matter of law to secure customs duties in connection with the
               importation of goods;
<PAGE>

                                      -73-

                    (iii) Liens existing on the Restatement Date and described
               on Part I of Schedule 5.02(a)(iii);

                    (iv)  On or prior to September 25, 1999, Liens on cash (in
               an aggregate amount, for Terra and its Subsidiaries taken as a
               whole, not exceeding $15,000,000 at any time) to secure the
               Obligations in respect of letters of credit permitted under
               Section 5.02(b)(1)(iv) (provided that all such Liens permitted
                                       --------
               under this clause (iv) are released and discharged (to the
               satisfaction of the Administrative Agent) by not later than
               September 25, 1999);

                    (v)   Purchase money Liens upon or in property acquired or
               held by Terra or such Subsidiary in the ordinary course of
               business to secure the purchase price of such property or to
               secure Debt (including, without limitation, commercial letters of
               credit) incurred solely for the purpose of financing the
               acquisition, construction or improvement of any such property to
               be subject to such Liens, or Liens existing on any such property
               at the time of acquisition (and not created in anticipation
               thereof), or extensions, renewals or replacements of any of the
               foregoing for the same or a lesser amount; provided that (x) no
                                                          --------
               such Lien shall extend to or cover any property other than the
               property being acquired, constructed or improved, and no such
               extension, renewal or replacement shall extend to or cover any
               property not theretofore subject to the Lien being extended,
               renewed or replaced; and (y) the Debt secured by any such Lien
               shall at no time exceed 100% of the fair market value (as
               determined in good faith by the Senior Financial Officer) of such
               property at the time it was acquired;

                    (vi)  Any Lien arising after the Restatement Date in favor
               of any state of the United States of America or any agency,
               political subdivision or instrumentality thereof, upon any
               pollution abatement or control facilities being financed in
               compliance with Section 103(c)(4)(F) of the Internal Revenue Code
               of 1986, as in effect on the date of this Agreement (or any
               successor statute which is similar in all substantive respects),
               the interest payable in respect of which financing is excluded
               from gross income under said Section 103, provided that (x) the
                                                         --------
               Debt secured by such Lien is not prohibited by clause (b)(1) of
               this Section 5.02, and (y) such Lien does not cover any other
               property at any time owned by Terra or any Material Subsidiary;

                    (vii) Liens on property that is the subject of a capital
               lease outstanding on the Restatement Date and set forth in Part
               II of Schedule 5.02(a)(iii) to secure the performance of the
               Capital Lease Obligations relating thereto;

                    (viii) Liens upon property of a Person that becomes a
               Subsidiary of Terra after the Restatement Date, each of which
               Liens existed on such property before the time such Person became
               a Subsidiary of Terra and was not created in anticipation
               thereof; provided that no such Lien shall extend to or cover any
                        --------
<PAGE>

                                      -74-

               property of Terra or any of its Subsidiaries other than the
               property subject to such Liens at the time such Person became a
               Subsidiary of Terra and improvements thereon;

                    (ix)   Leases or subleases, and licenses or sublicenses,
               granted to third Persons not interfering in any material respect
               with the business of Terra or such Subsidiary;

                    (x)    Easements, rights-of-way, restrictions, minor defects
               or irregularities in title and other similar charges or
               encumbrances not interfering in any material respect with the
               ordinary conduct of the business of Terra or such Subsidiary;

                    (xi)   Liens arising from Uniform Commercial Code financing
               statements regarding operating leases permitted by this
               Agreement;

                    (xii)  Any interest or title of a lessor or sublessor or
               licensor under any lease or license permitted or not prohibited
               by this Agreement;

                    (xiii) Additional Liens upon property created after March
               31, 1998, provided that the aggregate Debt secured thereby and
               incurred on and after the Restatement Date shall not exceed
               $5,000,000 in the aggregate at any one time outstanding;

                    (xiv)  Liens on property constituting all or part of the
               Ammonia Loop incurred in connection with the construction thereof
               (which Liens shall be terminated upon the completion thereof or
               as soon thereafter as reasonably practicable);

                    (xv)   The replacement, extension or renewal of any Lien
               permitted by clauses (iii), (viii), (xiii) and (xiv) above upon
               or in the same property theretofore subject thereto or the
               replacement, extension or renewal (without increase in the
               principal amount or change in any direct or contingent obligor)
               of the Debt secured thereby;

                    (xvi)  Liens on property of Terra Canada to secure the Terra
               Canada Credit Facility;

                    (xvii) Liens on property of Terra U.K. to secure the Terra
               U.K. Term Loan;

                    (xviii) Liens securing obligations of the Company and its
               Subsidiaries under Hedge Agreements in respect of nitrogen and
               natural gas prices permitted by Section 5.02(c); and
<PAGE>

                                      -75-

                    (xix)  Liens on property of Terra and its Subsidiaries
               (other than (1) property subject to the Liens under the Security
               Documents and (2) property subject to any Liens securing Debt of
               Terra or such Subsidiaries) in favor of Terra or any of its
               Subsidiaries to secure Debt owing to Terra or any of its
               Subsidiaries.

               (b)  Debt.
                    ----

               (1)  Generally. Create, incur, assume or suffer to exist, or
                    ---------
          permit any of its Subsidiaries to create, incur, assume or suffer to
          exist, any Debt other than:

                    (i)   Debt under the Loan Documents;

                    (ii)  Debt in respect of Hedge Agreements permitted by
               Section 5.02(c);

                    (iii) Debt in respect of unsecured trade payables (and
               Obligations in respect of letters of credit supporting such trade
               payables);

                    (iv)  Debt (including, without limitation, Obligations in
               respect of letters of credit) not secured by any Lien (other than
               Liens permitted by Section 5.02(a)(iv)), so long as, on the date
               of the incurrence thereof, the aggregate principal amount (or the
               U.S. Dollar equivalent of the aggregate principal amount) of all
               Debt of Terra and its Subsidiaries on a Consolidated basis (as
               reasonably determined by the Senior Financial Officer on and as
               of the date of such incurrence) then outstanding under this
               clause (iv) (including, without limitation, the Debt proposed to
               be incurred on such date) does not exceed $10,000,000;

                    (v)   Obligations of the Company and its Subsidiaries under
               the Intercompany Receivables Facilities;

                    (vi)  Debt securities of Terra issued in a public offering
               pursuant to an effective registration statement the terms of
               which (including, without limitation, as to interest rates,
               amortization (provided that in any event no payments of
                             --------
               principal, redemptions, sinking fund payments or the like shall
               be scheduled to be made before the Commitment Termination Date),
               redemption, average life to maturity, covenants, events of
               default and other terms) are reasonably satisfactory to the
               Required Lenders;

                    (vii)  Debt outstanding (or committed to be made available)
               as at the Restatement Date and set forth on Schedule 4.01(y);

                    (viii) endorsement of negotiable instruments for deposit or
               collection or similar transactions in the ordinary course of
               business;
<PAGE>

                                      -76-


                    (ix)   Intercompany Debt permitted under Section 5.02(b)(2);

                    (x)    Debt secured by Liens permitted under Section
               5.02(a)(v); purchase money Debt secured by Liens permitted under
               5.02(a)(viii); and Debt in an aggregate principal amount not
               exceeding $5,000,000 at any one time outstanding secured by Liens
               permitted under Section 5.02(a)(xiii);

                    (xi)   Acquired Debt in an aggregate principal amount not
               exceeding $10,000,000 at any one time outstanding;

                    (xii)  1995 Terra Debt (and Debt of Terra evidenced by
               instruments issued in exchange for such Debt), and renewals,
               refinancings and replacements thereof (without increase in the
               principal amount or change in any direct or contingent obligor,
               and on such other terms and conditions as shall be no less
               favorable to Terra and its Subsidiaries than the Debt being so
               renewed, refinanced or replaced);

                    (xiii) renewals, refinancings and replacements of the Debt
               permitted under clauses (vi), (vii), (x) and (xi) above and
               clause (xv) below (without increase in the principal amount or
               change in any direct or contingent obligor and not including any
               Debt to be paid or prepaid with the proceeds of Advances);

                    (xiv)  Debt of Terra to former shareholders of Huntting
               Elevator Company in an aggregate principal amount not exceeding
               $7,000,000;

                    (xv)   Debt of Terra Canada under the Terra Canada Credit
               Facility in an aggregate principal amount not at any time
               exceeding $118,000,000, and Guarantees thereof by Terra and one
               or more of its Subsidiaries;

                    (xvi)  Guarantees by Terra U.K. of Terra U.K. Customer Debt;
               provided that:
               --------
                           (A) the aggregate principal amount of such Debt so
                    Guaranteed by Terra U.K. with respect to any customer at any
                    time shall not exceed 50% of the aggregate principal amount
                    of the Terra U.K. Customer Debt of such customer outstanding
                    at such time; and

                           (B) the aggregate principal amount of Terra U.K.
                    Customer Debt Guaranteed by Terra U.K. at any time during
                    any fiscal year of Terra U.K. shall not exceed (x)
                    (pound)15,000,000 minus (y) the aggregate amount of payments
                                      -----
                    made by Terra U.K. under all such Guarantees during such
                    fiscal year;
<PAGE>

                                      -77-

                    (xvii)  unsecured Debt of Terra U.K. in an aggregate
               principal amount not at any time exceeding (pound)2,000,000;

                    (xviii) unsecured Debt of Terra Canada in an aggregate
               principal amount not at any time exceeding $2,000,000 (or its
               equivalent in Canadian Dollars at the time of borrowing thereof);

                    (xix)   Debt of Terra and its Subsidiaries ("Special
                                                                 -------
               Refinancing Debt"), provided that:
               ----------------    --------

                            (I)   such Special Refinancing Debt refinances or
                    replaces Debt outstanding under clause (vi), (vii) or (xv)
                    of this Section 5.02(b)(1) ("Refinanceable Debt") within 45
                    days after the incurrence of such Special Refinancing Debt;

                            (II)  the proceeds of such Special Refinancing Debt
                    are used, among other things, to refinance or replace
                    Refinanceable Debt, to pay call premiums (if any) on the
                    Refinanceable Debt so refinanced or replaced and reasonable
                    fees and expenses incurred by Terra and its Subsidiaries in
                    connection therewith;

                            (III) the aggregate principal amount of outstanding
                    Special Refinancing Debt does not exceed the aggregate
                    principal amount of Refinanceable Debt so refinanced or
                    replaced plus $16,500,000; and

                            (IV)  until the proceeds of such Special Refinancing
                    Debt are applied to the outstanding principal amount of
                    Refinanceable Debt, such proceeds are held in an account
                    pursuant to escrow or similar arrangements in form and
                    substance satisfactory to the Administrative Agent; and

                    (xx)    Guarantees incurred by TI prior to the Restatement
               Date; provided that the aggregate outstanding principal amount of
                     --------
               Terra Customer Debt Guaranteed by TI at any time during any
               fiscal year of TI shall not exceed $2,600,000 plus the
                                                             ----
               Indemnified Amount then in effect. For purposes of this Section
               5.02(b)(1)(xx) "Indemnified Amount" at any time means the lesser
               of (A) the aggregate outstanding principal amount of Terra
               Customer Debt Guaranteed by TI as to which Cenex shall have
               agreed to indemnify TI and (B) $7,400,000.

               (2)  Intercompany Debt. Create, incur, assume or suffer to exist,
                    -----------------
          or permit any of its Subsidiaries to create, incur, assume or suffer
          to exist, any Intercompany Debt other than:
<PAGE>

                                      -78-

               (i)    Intercompany Debt outstanding on the Restatement Date
          (other than Debt of TNLP);

               (ii)   Intercompany Debt of TNLP to the Company evidenced by
          promissory notes payable to the Company (such notes collectively the
          "TNLP Notes"), provided that (i) such Debt is used solely to finance
           ----------    --------
          the ongoing working capital needs of TNLP, to finance Capital
          Expenditures by TNLP permitted to be made under 5.02(h) and to finance
          Investments by TNLP permitted to be made by Section 5.02(f)(xiv) and
          (ii) such Debt is secured by a first and prior perfected security
          interest in favor of the Company covering property of TNLP having an
          aggregate fair market value not at any time less than the aggregate
          principal amount of the TNLP Notes outstanding at such time;

               (iii)  additional Intercompany Debt of any wholly owned
          Subsidiary of Terra (other than Debt of TNLP, Terra Canada and Terra
          U.K.);

               (iv)   additional Intercompany Debt of Terra Canada and Terra
          U.K. in an aggregate principal amount not at any time exceeding
          $75,000,000;

               (v)    additional Intercompany Debt of members of the Terra
          Canada Group the proceeds of which are used solely to repay the
          outstanding principal amount of the loans (together with accrued
          interest and fees thereon) under the Terra Canada Credit Facility;

               (vi)   Debt of Terra U.K. to Terra U.K. Holdings in an aggregate
          principal amount not exceeding $175,000,000 and outstanding on the
          Restatement Date (the "Terra U.K. Term Loan"), provided that any
                                 --------------------    --------
          portion of the Terra U.K. Term Loan that is prepaid or repaid and
          subsequently reborrowed shall not be permitted by this clause (v);

               (vii)  additional Intercompany Debt of any Subsidiary of TNLP to
          TNLP in an aggregate principal amount not exceeding $500,000; and

               (viii) additional Intercompany Debt.

          (c) Hedge Agreements. Enter into or permit to be outstanding, or
              ----------------
     permit any of its Subsidiaries to enter into or permit to be outstanding,
     any Hedge Agreement other than:

               (1)    Hedge Agreements entered into prior to the Restatement
          Date in respect of interest rates, foreign exchanges rates or natural
          gas prices and identified on Schedule 5.02(c);

               (2)    the Ammonium Nitrate Hedging Agreement; and
<PAGE>

                                      -79-

               (3)  other Hedge Agreements entered into in the ordinary course
          of business and in a reasonably prudent manner and not for speculative
          purposes, in each case in order to protect against the fluctuation in
          interest rates, foreign exchange rates, natural gas prices or nitrogen
          prices.

          (d) Mergers, Etc. Merge with or into or consolidate with or into any
              -------------
     Person, or permit any of its Material Subsidiaries to do so, except that:

               (i)  if no Default or Event of Default shall have occurred and
          be continuing or would result therefrom, (x) any Subsidiary of the
          Company may be merged or consolidated with or into the Company
          (provided that the Company shall be the continuing or surviving
           --------
          corporation) or any other wholly owned Subsidiary of the Company and
          (y) the Company or any of its Subsidiaries may merge or consolidate
          with any other Person; provided that (1) in the case of a merger or
                                 --------
          consolidation of the Company, the Company is the continuing or
          surviving corporation, and (2) in any other case, the continuing or
          surviving corporation is a wholly owned Subsidiary of the Company; and

               (ii) if no Default or Event of Default shall have occurred and
          be continuing or would result therefrom, (x) any Outside Subsidiary
          may be merged or consolidated with or into Terra (provided that Terra
                                                            --------
          shall be the continuing or surviving corporation) or any other wholly
          owned Outside Subsidiary of Terra and (y) Terra or any of its Outside
          Subsidiaries may merge or consolidate with any other Person (other
          than Terra Capital Holdings or any of its Subsidiaries); provided that
                                                                   --------
          (1) in the case of a merger or consolidation of Terra, Terra is the
          continuing or surviving corporation, and (2) in any other case, the
          continuing or surviving corporation is a wholly owned Outside
          Subsidiary of Terra.

          (e) Sales, Etc., of Assets. Sell, lease, transfer or otherwise dispose
              ----------------------
     of (including, without limitation, in a sale-leaseback transaction), or
     permit any of its Subsidiaries to sell, lease, transfer or otherwise
     dispose of (including, without limitation, in a sale-leaseback
     transaction), any of its assets, including (without limitation) any
     manufacturing plant or substantially all assets constituting the business
     of a division, branch or other unit operation, except:

               (i)  sales of inventory and Permitted Investments in the ordinary
          course of its business;

               (ii) sales or other dispositions of obsolete or worn-out
          equipment no longer used or useful in its business;
<PAGE>

                                      -80-

               (iii) dispositions of assets by one member of the Specified Group
          to another member of the Specified Group (where "Specified Group"
                                                           ---------------
          means, collectively, the Company and each of its wholly owned
          Subsidiaries);

               (iv)  (W) to the extent not permitted pursuant to clause (iii)
          above, dispositions of assets by one Obligor to another and by an
          Obligor to one of its or any other Obligor's wholly owned
          Subsidiaries, (X) other Dispositions with the consent of the Required
          Lenders, (Y) other Dispositions (and other sales, assignments,
          transfers or other dispositions of property sold or disposed of in the
          ordinary course of business and on ordinary business terms and other
          sales, assignments, transfers or other dispositions of items no longer
          necessary in the business of Terra or any of its Subsidiaries) in an
          aggregate amount not to exceed $5,000,000 in any period of 12
          consecutive months (beginning after the Restatement Date) and (Z)
          dispositions of precious metals for recovery from spent catalysts and
          repurchases thereof for catalytic purposes; provided that, in the case
                                                      --------
          of all Dispositions under this clause (iv) (A) each such asset is sold
          for an amount not less than its fair market value, (B) no such asset
          may be sold to the extent that it is, individually or when considered
          with any other asset or assets sold or expected to be sold in such
          period (but taking into account property acquired in exchange for, or
          to be acquired substantially contemporaneously with the disposition
          of, the assets so sold or expected to be sold), material to the
          business, assets, operations, properties or financial condition of
          Terra and its Subsidiaries taken as a whole, and (C) the Net Available
          Proceeds of such Disposition are applied in accordance with and to the
          extent required by Section 2.05(b), and to the extent the assets
          subject to the Disposition constituted part of the Collateral, all
          other cash and non-cash proceeds of such Disposition become subject to
          the Lien created by the Security Documents in accordance with the
          terms thereof;

               (v)   nothing in this Section 5.02(e) shall prohibit the Company
          or any of its Subsidiaries from selling Receivables under any
          Intercompany Receivables Facility;

               (vi)  transfers of assets by Terra or one of the Outside
          Subsidiaries, directly or indirectly, to a wholly owned Subsidiary of
          Terra (a "Recipient") so long as the consideration paid by such
                    ---------
          Recipient (if any) for all such assets does not exceed the fair market
          value of such property;

               (vii) (A) transfers of assets by Terra or one of its wholly owned
          Subsidiaries to TNCLP or a Subsidiary thereof so long as the
          consideration paid to Terra and its wholly owned Subsidiaries for all
          such assets is not less than the fair market value of such property;
          and (B) transfers of assets by TNCLP or a Subsidiary thereof to Terra
          or one of its wholly owned Subsidiaries so long as the consideration
          paid by Terra and its wholly owned Subsidiaries for all such assets
          does not exceed the fair market value of such property;
<PAGE>

                                      -81-

               (viii) dividends with respect to the capital stock of Terra U.K.
          paid to Terra Canada for any fiscal year of Terra in an aggregate
          amount not exceeding the aggregate amount required to be paid by Terra
          Canada to ICI pursuant to the terms of the Ammonium Nitrate Hedging
          Agreement for such fiscal year;

               (ix)   the sale of the Distribution Business by Terra pursuant to
          the Distribution Business Sale Agreement (including, without
          limitation, the sale, assignment, transfer or disposition to one or
          more third parties of any property excluded from the sale of the
          Distribution Business pursuant to Section 4.1.13.3 of the Distribution
          Business Sale Agreement) and the sale by BMLP of all or any portion of
          its ownership interests in its methanol plant located in Beaumont,
          Texas; and

               (x)    additional sales, leases, transfers and other dispositions
          of property by Terra and its Subsidiaries (other than (1) property
          subject to the Liens under the Security Documents and (2) property
          subject to any Liens securing Debt of Terra or such Subsidiary) to
          Terra or any of its Subsidiaries.

          (f) Investments. Make or hold, or permit any of its Subsidiaries to
              -----------
    make or hold, any Investment, other than:

               (i)    Investments by Terra and its Subsidiaries in cash and
          Permitted Investments;

               (ii)   Investments constituting (A) operating deposit accounts
          with banks and (B) Receivables arising in the ordinary course of
          business on ordinary business terms, in each case in accordance with,
          and subject to the terms of, the Security Documents;

               (iii)  Investments described in Schedule 5.02(f);

               (iv)   Investments arising solely by reason of any merger or
          consolidation expressly permitted by Section 5.02(d)(i)(x) or
          5.02(d)(ii)(x);

               (v)    Specified Acquisitions to the extent permitted to be made
          under Section 5.02(h);

               (vi)   Investments consisting of acquisitions of property
          (including, without limitation, ownership interests in any Person) by
          Terra or any of its Subsidiaries so long as (x) the aggregate fair
          market value of all such property acquired in any fiscal year of Terra
          shall not exceed $50,000,000, and (y) the consideration paid
<PAGE>

                                      -82-

          by Terra and its Subsidiaries for each such acquisition consists
          solely of equity securities issued by Terra;

               (vii)  Investments in respect of Hedge Agreements permitted by
          Section 5.02(c);

               (viii) Investments made pursuant to Terra's Supplemental Deferred
          Compensation Plan and its Excess Benefit Plan, each as in effect from
          time to time;

               (ix)   Investments by Terra and its Subsidiaries consisting of
          the purchase, redemption or other acquisition of Senior Preference
          Units pursuant to the SPU Redemption, provided that the aggregate
                                                --------
          amount of all such Investments under this clause (ix) for any fiscal
          year of Terra plus the aggregate amount of Capital Expenditures and
                        ----
          Specified Acquisitions by Terra and its Subsidiaries during such
          fiscal year does not exceed (i) $80,000,000 for the fiscal year of
          Terra ending December 31, 1999 and (ii) $35,000,000 for each fiscal
          year of Terra ending thereafter;

               (x)    Debt (including Guarantees of Debt) constituting
          Investments, to the extent such Debt is permitted under Section
          5.02(b);

               (xi)   capital contributions to Receivables Subsidiaries;

               (xii)  Investments in respect of the purchase of the BMLP Class A
          Limited Partnership Interest as required under Section 3.01(p);

               (xiii) Investments by one member of the Specified Group in
          another member of the Specified Group (other than members of the Terra
          Canada Group);

               (xiv)  Investments by TNLP in any Subsidiary or Affiliate of TNLP
          in an aggregate amount not exceeding at any one time $500,000 ;

               (xv)   Investments by Terra or Terra Capital Holdings in the
          Company; and

               (xvi)  additional Investments by Terra and its Subsidiaries in
          Terra or any of its Subsidiaries.

          (g) Payments to Minority Interests. Pay or cause to be paid, or
              ------------------------------
permit any of its Subsidiaries to pay or cause to be paid, to any holder of a
minority interest any amount with respect to such minority interest in excess of
the amount to which such holder is legally entitled, unless Terra or such
Subsidiary simultaneously receives payment in an amount equal to or greater than
its ratable share of the amount of the related distribution (determined in
accordance with the respective interests then held by Terra and such
<PAGE>

                                      -83-

Subsidiary, on the one hand, and such holder, on the other), provided that the
                                                             --------
SPU Redemption and payments pursuant to the purchase of the BMLP Class A Limited
Partnership Interest as required under Section 3.01(p) (and any payments related
thereto after the Restatement Date) will not constitute a breach of this Section
5.02(g).

     (h) Restricted Transactions, Etc. Make any Capital Expenditures or
         -----------------------------
Specified Acquisitions, except for Capital Expenditures and Specified
Acquisitions such that the aggregate amount of all Investments permitted under
Section 5.02(f) (ix) for any fiscal year of Terra plus the aggregate amount of
                                                  ----
Capital Expenditures and Specified Acquisitions by Terra and its Subsidiaries
during such fiscal year does not exceed (i) $80,000,000 for the fiscal year of
Terra ending December 31, 1999 and (ii) $35,000,000 for each fiscal year of
Terra ending thereafter.

     (i) Change in Nature of Business. Make, or permit any of its Material
         ----------------------------
Subsidiaries to make, any material change in the nature of the business of Terra
and its Subsidiaries taken as a whole as carried on at the Restatement Date,
provided that the sale by Terra of the Distribution Business as contemplated in
- --------
the Distribution Business Sale Agreement, the sale by Terra of all of its
ownership interests in BMLP or the sale by BMLP of all of its ownership
interests in its methanol plant located in Beaumont, Texas shall not constitute
a breach of this Section 5.02(i).

     (j) Charter Amendments. Amend, or permit any of its Material Subsidiaries
         ------------------
to amend, its articles of incorporation or bylaws, or amend any partnership
agreement to which it or any of its Subsidiaries is a party (except for
amendments to authorize the issuance of preferred or common stock), in each case
to the extent any such amendment could reasonably be expected to have a Material
Adverse Effect.

     (k) Accounting Changes. Make or permit, or permit any of its Subsidiaries
         ------------------
to make or permit, any change in accounting policies or reporting practices,
except as required or permitted by generally accepted accounting principles in
effect in the United States; provided that in the event of any change in
                             --------
generally accepted accounting principles from the date of the financial
statements referred to in Section 4.01(f) and upon delivery of any financial
statement and accompanying certificate of compliance required to be furnished
under subsections (b) and (c) of Section 5.03, Terra shall deliver to the
Lenders a statement of reconciliation conforming any information contained in
such financial statement and a certificate of compliance required to be
furnished pursuant to subsections (b) and (c) of Section 5.03 with GAAP (it
being understood that compliance with financial covenants herein shall be
measured and determined on the basis of GAAP).

     (l) Amendment of Ammonium Nitrate Hedging Agreement, Etc. Consent to or
         -----------------------------------------------------
accept any cancellation or termination of the Ammonium Nitrate Hedging
Agreement, amend, modify or change in any manner any material term or condition
thereof, waive any default under or any breach of any material term or condition
thereof, agree in any
<PAGE>

                                      -84-

manner to any other amendment, modification or change of any material term or
condition thereof, in each case without the prior consent of the Lenders.

     (m) Certain Obligations Respecting Subsidiaries. Enter into, or permit any
         -------------------------------------------
of its Subsidiaries (other than a Receivables Subsidiary) to enter into, after
the Restatement Date, any indenture, agreement, instrument or other arrangement
that, directly or indirectly, prohibits or restrains, or has the effect of
prohibiting or restraining, or imposes materially adverse conditions upon, the
declaration or payment of dividends or the making of loans or advances to or
Investments in or the sale, assignment, transfer or other disposition of
property to Terra or any Subsidiary thereof (other than a Receivable
Subsidiary); provided that:
             --------

               (1) the Terra U.K. Term Loan Agreement (or any agreement which
     refinances part or all of the Terra U.K. Term Loan Agreement) may restrict
     such actions by Terra U.K. and its Subsidiaries; and

               (2) the Terra Canada Credit Facility may restrict such actions by
     Terra Canada and its Subsidiaries.

     (n) Subordinated Indebtedness. Purchase, redeem, retire or otherwise
         -------------------------
acquire for value, or set apart any money for a sinking, defeasance or other
analogous fund for the purchase, redemption, retirement or other acquisition of,
or make any voluntary payment or prepayment of the principal of or interest on,
or any other amount owing in respect of, any Subordinated Indebtedness (other
than Intercompany Debt) (and such Obligor will not permit any of its
Subsidiaries to do any of the foregoing), in each case except for regularly
scheduled payments of principal and interest in respect thereof required
pursuant to the instruments evidencing such Subordinated Indebtedness, or amend
the documentation creating or evidencing such Subordinated Indebtedness.

     (o) Transactions with Affiliates. Except to the extent otherwise expressly
         ----------------------------
permitted hereunder, enter into any transaction with any Affiliate on terms less
favorable than would pertain in a transaction entered into with a third party on
an arm's-length basis.

     (p) Amendments to Management Agreements. Without the consent of the
         -----------------------------------
Administrative Agent, amend, modify or change in any material respect the terms
or conditions of any Management Agreement.

     (q) Margin Stock. Permit more than 25%, after applying the proceeds of each
         ------------
Advance, of the value of the assets of the Borrower and of the Borrower and its
Subsidiaries taken as a whole (as determined in good faith by the Borrower) that
are subject to Section 5.02(a) or Section 5.02(e) to consist of or be
represented by Margin Stock.
<PAGE>

                                      -85-

          (r) Dividend Payments. On any Restricted Payment Date, make or declare
              -----------------
     any dividend payment (in cash, property or obligations) on, or other
     payment or distribution on account of, or set apart money for a sinking or
     other analogous fund for, or purchase, redeem, retire or otherwise acquire,
     any shares of any class of stock of Terra or any warrants, options or other
     rights to acquire the same (or make any payment to any Person, such as
     "phantom stock" payments, where the amount thereof is calculated with
     reference to the fair market or equity value of Terra, other than any such
     payment made in the ordinary course of business of such Person in
     connection with an executive compensation plan approved by the Board of
     Directors of such Person), but excluding dividends payable solely in shares
     of common stock of Terra. For purposes of this Section 5.02(r) "Restricted
     Payment Date" means a date as of which the Debt to Cash Flow Ratio for the
     most recently concluded Rolling Period is greater than or equal to 5.50 to
     1.00.

          Section 5.03. Reporting Requirements. So long as any principal of or
                        ----------------------
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of Credit shall be outstanding or any Lender shall
have any Commitment hereunder:

          (a) Default Notice. Each Obligor will furnish to the Administrative
              --------------
     Agent, as soon as possible and in any event within five Business Days after
     such Obligor knows or has reason to believe that a Default or Event of
     Default has occurred (which Default or Event of Default is continuing on
     the date of the following statement), a statement of the Senior Financial
     Officer setting forth details of such Default or Event of Default and the
     action that such Obligor has taken and proposes to take with respect
     thereto.

          (b) Quarterly Financials. As soon as available and in any event within
              --------------------
     60 days after the end of each of the first three quarters of each fiscal
     year of Terra, Terra will furnish to the Administrative Agent, with
     sufficient copies for each Lender and each Issuing Bank, a Consolidated
     balance sheet of Terra and its Subsidiaries as of the end of such quarter
     and Consolidated statements of income and cash flows of Terra and its
     Subsidiaries for the period commencing at the end of the previous fiscal
     year and ending with the end of such quarter, setting forth in each case in
     comparative form the corresponding figures for the corresponding period of
     the preceding fiscal year in reasonable detail and duly certified (subject
     to year-end audit adjustments) by the Senior Financial Officer as having
     been prepared in accordance with GAAP, together with (i) a certificate of
     said officer (A) stating that no Default or Event of Default has occurred
     and is continuing or, if a Default or Event of Default has occurred and is
     continuing, a statement as to the nature thereof and the action that Terra
     has taken and proposes to take with respect thereto, (B) stating that since
     December 31, 1998, there has been no Material Adverse Change with respect
     to Terra and (C) providing a comparison between the financial position and
     results of operations set forth in such financial statements with the
     comparable information set forth in the financial projections and budget
     most recently delivered pursuant Section 5.03(l) of the Existing Credit
     Agreement or Section 5.03(l), (ii) a schedule in form satisfactory to the
     Administrative Agent of the computations used
<PAGE>

                                      -86-

     by Terra in determining compliance with the covenants contained in Section
     5.04 and (iii) a Liquid Asset Coverage Certificate as at the last day of
     such accounting period.

         (c) Annual Financials. As soon as available and in any event within 110
             -----------------
     days after the end of each fiscal year of Terra, Terra will furnish to the
     Administrative Agent, with sufficient copies for each Lender and each
     Issuing Bank, a copy of the annual audit report for such year for Terra and
     its Subsidiaries, including therein a Consolidated balance sheet of Terra
     and its Subsidiaries as of the end of such fiscal year and Consolidated
     statements of income and cash flows of Terra and its Subsidiaries for such
     fiscal year, setting forth in each case in comparative form the
     corresponding figures for the preceding fiscal year accompanied by an
     unqualified opinion of Deloitte & Touche or other independent public
     accountants of nationally recognized standing stating that, except as
     expressly disclosed therein, said Consolidated financial statements present
     fairly, in all material respects, the Consolidated financial position and
     results of operations of Terra and its Consolidated Subsidiaries as of the
     last day of, and for, such fiscal year, together with (i) a certificate of
     such accounting firm to the Lenders stating that in the course of the
     regular audit of the business of Terra and its Subsidiaries, which audit
     was conducted by such accounting firm in accordance with generally accepted
     auditing standards, such accounting firm has obtained no knowledge that a
     Default or Event of Default has occurred and is continuing, or if, in the
     opinion of such accounting firm, a Default or Event of Default has occurred
     and is continuing, a statement as to the nature thereof (it being
     understood that said accountants shall have no liability to the
     Administrative Agent, the Lenders or the Issuing Banks for failure to
     obtain knowledge of any Default or Event of Default), (ii) a schedule in
     form satisfactory to the Administrative Agent of the computations used by
     such accountants in determining, as of the end of such fiscal year,
     compliance with the covenants contained in Section 5.04 and (iii) a
     certificate of the Senior Financial Officer (A) stating that no Default or
     Event of Default has occurred and is continuing or, if a Default or Event
     of Default has occurred and is continuing, a statement as to the nature
     thereof and the action that Terra has taken and proposes to take with
     respect thereto, (B) stating that since December 31, 1998, there has been
     no Material Adverse Change with respect to Terra and (C) providing a
     comparison between the financial position and results of operations set
     forth in such financial statements with the comparable information set
     forth in the financial projections and budget most recently delivered
     pursuant to Section 5.03(l) of the Existing Credit Agreement or Section
     5.03(l).

         (d) ERISA Events. Promptly and in any event within 10 Business Days
             ------------
     after any Obligor knows or has reason to know that any ERISA Event
     (including, for this purpose, a reportable event listed in Section
     4043(c)(7) of ERISA) with respect to any Obligor or any of its ERISA
     Affiliates has occurred, Terra will furnish to the Administrative Agent a
     statement of the Senior Financial Officer describing such ERISA Event and
     the action, if any, that such Obligor or such ERISA Affiliate has taken and
     proposes to take with respect thereto.
<PAGE>

                                      -87-

          (e) Plan Terminations. Promptly and in any event within 10 Business
              -----------------
     Days after receipt thereof by any Obligor or any of its ERISA Affiliates,
     such Obligor will furnish to the Administrative Agent copies of each notice
     from the PBGC stating its intention to terminate any Plan of any Obligor or
     any of its ERISA Affiliates or to have a trustee appointed to administer
     any such Plan.

          (f) Plan Annual Reports. Promptly and in any event within 30 days
              -------------------
     after the filing thereof with the Internal Revenue Service, each Obligor
     will furnish to the Administrative Agent copies of such Schedule B
     (Actuarial Information) to the annual report (Form 5500 Series) with
     respect to each Plan of each Obligor or any of its ERISA Affiliates that is
     then being maintained for employees or former employees of such Person.

          (g) Multiemployer Plan Notices. Promptly and in any event within five
              --------------------------
     Business Days after receipt thereof by any Obligor or any of its ERISA
     Affiliates from the sponsor of a Multiemployer Plan of any Obligor or any
     of its ERISA Affiliates, such Obligor will furnish to the Administrative
     Agent copies of each notice concerning (i) the imposition of withdrawal
     liability by any such Multiemployer Plan, (ii) the reorganization or
     termination, within the meaning of Title IV of ERISA, of any such
     Multiemployer Plan or (iii) the amount of liability incurred, or that is
     reasonably expected to be incurred, by such Obligor or any of its ERISA
     Affiliates in connection with any event described in clause (i) or (ii).

          (h) Litigation. Promptly after the commencement thereof, Terra will
              ----------
     furnish to the Administrative Agent notice of all actions, suits,
     investigations, litigation and proceedings before any court or governmental
     department, commission, board, bureau, agency or instrumentality, domestic
     or foreign, affecting any Obligor or any of its Subsidiaries of the type
     described in Section 4.01(h).

          (i) Environmental Conditions. Promptly after receiving notice thereof,
              ------------------------
     Terra will furnish to the Administrative Agent notice of any condition or
     occurrence on any property of any Obligor that results in a material
     noncompliance by any Obligor or any of its Subsidiaries with any
     Environmental Law or Environmental Permit which noncompliance could
     reasonably be expected to have a Material Adverse Effect, or could (i) form
     the basis of an Environmental Action against any Obligor or any of its
     Subsidiaries or such property that could reasonably be expected to have a
     Material Adverse Effect or (ii) cause any such property to be subject to
     any restrictions on ownership, occupancy, use or transferability under any
     Environmental Law that could reasonably be expected to have Material
     Adverse Effect.

          (j) Public Filings. Terra shall, promptly upon their becoming
              --------------
     available, deliver to the Administrative Agent, each Issuing Bank and each
     Lender copies of all registration statements and regular periodic reports,
     if any, that Terra, the Company or TNCLP shall
<PAGE>

                                      -88-

     have filed with the Securities and Exchange Commission (or any governmental
     agency substituted therefor) or any national securities exchange.

          (k) Shareholder Reports, Etc. Terra shall deliver to the
              -------------------------
     Administrative Agent, each Issuing Bank and each Lender promptly upon the
     mailing thereof to the shareholders of Terra or TNCLP generally or to
     holders of Subordinated Indebtedness or 1995 Terra Debt generally, copies
     of all financial statements and proxy statements so mailed.

          (l) Financial Projections and Budget. As soon as available and in any
              --------------------------------
     event within 110 days after the first day of each fiscal year of Terra,
     Terra will furnish to the Administrative Agent, with sufficient copies for
     each Lender and each Issuing Bank, financial projections and a budget for
     such fiscal year and each subsequent fiscal year of Terra to and including
     the fiscal year in which the Commitment Termination Date is scheduled to
     occur, in each case in form and detail similar to the financial projections
     and budget delivered under Section 5.03(l) of the Existing Credit
     Agreement.

          (m) Other Information. Each Obligor shall furnish to the Lenders
              -----------------
     through the Administrative Agent such other information respecting the
     business, condition (financial or otherwise), operations, performance,
     properties or prospects of any Obligor or any of its Subsidiaries as the
     Administrative Agent, any Issuing Bank or any Lender may from time to time
     reasonably request.

          Section 5.04. Financial Covenants. So long as any principal of or
                        -------------------
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of Credit shall be outstanding or any Lender shall
have any Commitment hereunder, Terra will:

          (a) Debt to Cash Flow Ratio. Maintain the Debt to Cash Flow Ratio at
              -----------------------
     not more than the ratio set forth below for each Rolling Period ending in
     the respective periods set forth below:
<PAGE>

                                      -89-

                                Each
                           Rolling Period
                             Ending In                         Ratio
                           --------------                      -----

                           June, 1999                      6.30 to 1.00
                           September, 1999                 8.80 to 1.00
                           December, 1999                  9.20 to 1.00
                           March, 2000                     9.50 to 1.00
                           June, 2000                      7.50 to 1.00
                           September, 2000                 7.00 to 1.00
                           December, 2000                  6.50 to 1.00
                           March, June, September
                            and December of
                            fiscal year 2001               6.00 to 1.00
                           March, June, September
                            and December of
                            fiscal year 2002               4.50 to 1.00

          (b) Interest Coverage Ratio. Maintain the Interest Coverage Ratio at
              -----------------------
     not less than the ratio set forth below for each Rolling Period ending in
     the respective periods set forth below:
<PAGE>

                                      -90-

                                Each
                           Rolling Period
                             Ending In                         Ratio
                           --------------                      -----
                           June, 1999                      1.00 to 1.00
                           September, 1999                 1.00 to 1.00
                           December, 1999                  1.10 to 1.00
                           March, 2000                     1.10 to 1.00
                           June, 2000                      1.40 to 1.00
                           September, 2000                 1.40 to 1.00
                           December, 2000                  1.40 to 1.00
                           March, 2001                     1.40 to 1.00
                           June, 2001                      2.00 to 1.00
                           September, 2001                 2.00 to 1.00
                           December, 2001                  2.00 to 1.00
                           March, June, September
                            and December of
                            fiscal year 2002               2.50 to 1.00

          (c) Net Worth. Maintain the Net Worth of Terra on each day of not less
              ---------
     than (i) $550,000,000 plus (ii) the aggregate increase in the amount of
                           ----
     capital stock and additional paid-in capital of Terra subsequent to
     December 31, 1998 plus (iii) 50% of net income of Terra and its
                       ----
     Subsidiaries on a Consolidated basis (if positive) for each fiscal year of
     Terra ending on or after December 31, 1999.

                                  ARTICLE VI

                               EVENTS OF DEFAULT

          Section 6.01. Events of Default. If any of the following events
                        -----------------
("Events of Default") shall occur and be continuing:
  -----------------

          (a) the Borrower (i) shall fail to pay when due any principal of any
     Advance or (ii) shall fail for three Business Days to pay when due any
     interest on any Advance made to it or any other amount payable by it under
     any Loan Document; or

          (b) any representation or warranty made by any Obligor (or any of its
     officers) under or in connection with any Loan Document shall prove to have
     been incorrect in any material respect when made; or

          (c) any Obligor shall fail to perform or observe any term, covenant or
     agreement contained in clause (n) of Section 5.01, or clause (a), (b), (c),
     (d), (e), (g), (i), (q) or (r) of Section 5.02, or clause (a), (e) or (i)
     of Section 5.03, or Section 5.04; or
<PAGE>

                                      -91-

          (d)  Terra shall fail to pay and perform its obligations under the
     Loan Purchase Agreement; or

          (e)  any Obligor shall fail to perform any other term, covenant or
     agreement contained in any Loan Document on its part to be performed or
     observed if such failure shall remain unremedied for a period of 30 days;
     or

          (f)  any Obligor or any of its Material Subsidiaries shall fail to pay
     any principal of, premium or interest on or any other amount payable in
     respect of any Debt that is outstanding in a principal or notional amount
     of at least $10,000,000 in the aggregate (but excluding Debt outstanding
     hereunder) of such Obligor or such Subsidiary (as the case may be), when
     the same becomes due and payable (whether by scheduled maturity, required
     prepayment, acceleration, demand or otherwise), and such failure shall
     continue after the applicable grace period, if any, specified in the
     agreement or instrument relating to such Debt; or any other event shall
     occur or condition shall exist under any agreement or instrument relating
     to any such Debt and shall continue after the applicable grace period, if
     any, specified in such agreement or instrument, if the effect of such event
     or condition is to accelerate, or to permit the acceleration of, the
     maturity of such Debt or otherwise to cause, or to permit the holder or
     holders (or an agent or trustee on its or their behalf) thereof to cause,
     such Debt to mature; or any such Debt shall be declared to be due and
     payable or required to be prepaid or redeemed (other than by a regularly
     scheduled required prepayment or redemption), purchased or defeased, or an
     offer to prepay, redeem, purchase or defease such Debt shall be required to
     be made, in each case prior to the stated maturity thereof; or

          (g)  any Obligor or any of its Material Subsidiaries shall generally
     not pay its debts as such debts become due, or shall admit in writing its
     inability to pay its debts generally, or shall make a general assignment
     for the benefit of creditors; or any proceeding shall be instituted by or
     against any Obligor or any of its Material Subsidiaries seeking to
     adjudicate it a bankrupt or insolvent, or seeking liquidation, winding up,
     reorganization, arrangement, adjustment, protection, relief, or composition
     of it or its debts under any law relating to bankruptcy, insolvency or
     reorganization or relief of debtors, or seeking the entry of an order for
     relief or the appointment of a receiver, trustee, or other similar official
     for it or for any substantial part of its property and, in the case of any
     such proceeding instituted against it (but not instituted by it) that is
     being diligently contested by it in good faith, either such proceeding
     shall remain undismissed or unstayed for a period of 60 days or any of the
     actions sought in such proceeding (including, without limitation, the entry
     of an order for relief against, or the appointment of a receiver, trustee,
     custodian or other similar official for, it or any substantial part of its
     property) shall occur; or any Obligor or any of its Material Subsidiaries
     shall take any corporate or partnership action to authorize any of the
     actions set forth above in this subsection (g); or
<PAGE>

                                      -92-

          (h)  any judgment or order for the payment of money in excess of
     $10,000,000 shall be rendered against any Obligor or any of its Material
     Subsidiaries and either (i) enforcement proceedings shall have been
     commenced by any creditor upon such judgment or order or (ii) there shall
     be any period of 30 consecutive days during which a stay of enforcement of
     such judgment or order, by reason of a pending appeal or otherwise, shall
     not be in effect, unless such judgment or order shall have been vacated,
     satisfied or dismissed or bonded pending appeal; or

          (i)  any non-monetary judgment or order shall be rendered against any
     Obligor or any of its Subsidiaries that could be reasonably likely to have
     a Material Adverse Effect, and there shall be any period of 30 consecutive
     days during which a stay of enforcement of such judgment or order, by
     reason of a pending appeal or otherwise, shall not be in effect unless such
     judgment or order shall have been vacated, satisfied, discharged or bonded
     pending appeal; or

          (j)  any Security Document shall for any reason (other than pursuant
     to the terms hereof and thereof) cease to create a valid and perfected
     first priority Lien (subject only to Permitted Liens) on the Collateral
     purported to be covered thereby; or

          (k)  Minorco ceases to own, directly or indirectly, at least 20% of
     the issued and outstanding shares of voting capital stock of Terra; or
     Minorco ceases to hold, directly or indirectly, a plurality of the issued
     and outstanding shares of capital stock of Terra; or

          (l)  any ERISA Event shall have occurred with respect to a Plan of any
     Obligor or any of its ERISA Affiliates and the amount (determined as of the
     date of occurrence of such ERISA Event) of the Insufficiency of such Plan
     and the Insufficiency of any and all other Plans of the Obligors and their
     ERISA Affiliates with respect to which an ERISA Event shall have occurred
     and then exist (or the liability of the Obligors and their ERISA Affiliates
     related to such ERISA Event) could reasonably be expected to have a
     Material Adverse Effect; provided that with respect to any Multiple
                              --------
     Employer Plan, such Insufficiency shall include only the portion thereof
     attributable to such Obligor or its ERISA Affiliates; or

          (m)  any Obligor or any of its ERISA Affiliates shall have been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that it has incurred withdrawal liability to such
     Multiemployer Plan in an amount that, when aggregated with all other
     amounts required to be paid to Multiemployer Plans by the Obligors and
     their ERISA Affiliates as withdrawal liability (determined as of the date
     of such notification), could reasonably be expected to have a Material
     Adverse Effect; or

          (n)  any Obligor or any of its ERISA Affiliates shall have been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that such Multiemployer Plan is in reorganization or
     is being terminated, within the meaning of Title IV of ERISA, and as a
     result of such reorganization or termination the aggregate
<PAGE>

                                      -93-

     annual contributions of the Obligors and their ERISA Affiliates to all
     Multiemployer Plans that are then in reorganization or being terminated
     have been or will be increased over the amounts contributed to such
     Multiemployer Plans for the plan years of such Multiemployer Plans
     immediately preceding the plan year in which such reorganization or
     termination occurs by an amount that could reasonably be expected to have a
     Material Adverse Effect; or

          (o)  there shall have been asserted against Terra or any of its
     Subsidiaries an Environmental Claim that, in the judgment of the Required
     Lenders, is reasonably likely to be determined adversely to Terra or any of
     its Subsidiaries, and the amount thereof (either individually or in the
     aggregate) is reasonably likely to have a Material Adverse Effect (insofar
     as such amount is payable by Terra or any of its Subsidiaries but after
     deducting any portion thereof that is reasonably expected to be paid by
     other creditworthy Persons); or

then, and in any such event, the Administrative Agent (i) shall at the request,
or may with the consent, of the Required Lenders, by notice to the Borrower,
declare the obligation of each Lender to make Advances and of each Issuing Bank
to issue Letters of Credit to be terminated, whereupon the same shall forthwith
terminate (and this clause (i) shall also be applicable if there shall occur a
Purchase Event), and (ii) shall at the request, or may with the consent, of the
Required Lenders, by notice to the Borrower, declare the Advances and the Notes,
all interest thereon and all other amounts payable under this Agreement and the
other Loan Documents to be forthwith due and payable, whereupon the Advances and
the Notes, all such interest and all such amounts shall become and be forthwith
due and payable, without presentment, demand, protest or further notice of any
kind, all of which are hereby expressly waived by the Borrower; provided that in
                                                                --------
the event of an actual or deemed entry of an order for relief with respect to
any Obligor or any of its Subsidiaries under the Federal Bankruptcy Code, (x)
the obligation of each Lender to make Advances and of any Issuing Bank to issue
Letters of Credit shall automatically be terminated and (y) the Advances and the
Notes, all such interest and all such amounts shall automatically become and be
due and payable, without presentment, demand, protest or any notice of any kind,
all of which are hereby expressly waived by the Borrower.

     Section 6.02.  Actions in Respect of the Letters of Credit Upon Default. If
                    --------------------------------------------------------
any Event of Default shall have occurred and be continuing, the Administrative
Agent may, irrespective of whether it is taking any of the actions described in
Section 6.01 or otherwise, make demand upon the Borrower to, and forthwith upon
such demand the Borrower will, pay to the Administrative Agent on behalf of the
Lenders in same day funds at the Administrative Agent's Office, for deposit in
the relevant L/C Cash Collateral Account, an amount equal to the aggregate
Available Amount of all Letters of Credit then outstanding, which funds shall be
retained by the Administrative Agent in the relevant L/C Collateral Account as
collateral security for the Letter of Credit Liabilities until such time as the
Letters of Credit shall have been terminated and all of such Letter of Credit
Liabilities paid in full.
<PAGE>

                                      -94-

          If at any time the Administrative Agent determines that any funds held
in the relevant L/C Cash Collateral Account are subject to any right or claim of
any Person other than the Administrative Agent and the Lenders or that the total
amount of such funds is less than the aggregate Available Amount of all Letters
of Credit, the Borrower will, forthwith upon demand by the Administrative Agent,
pay to the Administrative Agent, as additional funds to be deposited and held in
the relevant L/C Cash Collateral Account, an amount equal to the excess of (a)
such aggregate Available Amount over (b) the total amount of funds, if any, then
                                ----
held in such L/C Cash Collateral Account that the Administrative Agent
determines to be free and clear of any such right and claim.

                                  ARTICLE VII

                           THE ADMINISTRATIVE AGENT

          Section 7.01.  Authorization and Action. Each Lender and each Issuing
                         ------------------------
Bank hereby appoints and authorizes the Administrative Agent to take such action
as agent on its behalf and to exercise such powers and discretion under this
Agreement and the other Basic Documents as are delegated to the Administrative
Agent by the terms hereof and thereof, together with such powers and discretion
as are reasonably incidental thereto. As to any matters not expressly provided
for by the Basic Documents, including, without limitation, enforcement or
collection of the Notes, the Administrative Agent shall not be required to
exercise any discretion or take any action, and shall not be required to act or
to refrain from acting (and shall be fully protected in so acting or refraining
from acting) except upon the instructions of the Required Lenders, and such
instructions shall be binding upon all Lenders and all holders of the Notes;
provided that the Administrative Agent shall not be required to take any action
- --------
that exposes it to personal liability or that is contrary to this Agreement or
applicable law. The Administrative Agent agrees to give to each Issuing Bank and
each Lender prompt notice of each notice given to it by the Borrower or Terra
pursuant to the terms of this Agreement. No party designated on the signature
pages hereof as a "Syndication Agent" or a "Documentation Agent" shall have any
liability or responsibility whatsoever hereunder in such capacity.

          Each Lender and Issuing Bank:

          (1)  hereby authorizes the Administrative Agent to execute and deliver
     the documents referred to in clauses (d) and (r) of Section 3.01, and each
     Lender and Issuing Bank agrees that it is bound by the Security Documents
     as if such Lender or Issuing Bank, as the case may be, were a signatory
     thereto;

          (2)  hereby authorizes the Administrative Agent to execute and deliver
     a Confirmation of Loan Purchase Agreement in substantially the form of
     Exhibit E, and each Lender and Issuing Bank agrees that it is bound by the
     Loan Purchase Agreement as if such Lender or Issuing Bank, as the case may
     be, were a signatory thereto; and
<PAGE>

                                      -95-

          (3)  hereby authorizes the Collateral Agent to execute and deliver the
     documents referred to in clauses (d) and (r) of Section 3.01.

          Section 7.02.  Administrative Agent's Reliance, Etc.  Neither the
                         -------------------------------------
Administrative Agent nor any of its respective directors, officers, agents or
employees shall be liable for any action taken or omitted to be taken by it or
them under or in connection with the Basic Documents, except for its or their
own gross negligence or willful misconduct. Without limitation of the generality
of the foregoing, the Administrative Agent (i) may treat the payee of any Note
as the holder thereof until the Administrative Agent receives and accepts an
Assignment and Acceptance entered into by the Lender that is the payee of such
Note, as assignor, and an Eligible Assignee, as assignee, as provided in Section
9.07; (ii) may consult with legal counsel (including counsel for any Obligor),
independent public accountants and other experts selected by it and shall not be
liable for any action taken or omitted to be taken in good faith by them in
accordance with the advice of such counsel, accountants or experts; (iii) makes
no warranty or representation to any Issuing Bank or any Lender and shall not be
responsible to any of them for any statements, warranties or representations
made in or in connection with the Loan Documents; (iv) shall not have any duty
to ascertain or to inquire as to the performance or observance of any of the
terms, covenants or conditions of any Loan Document on the part of any Obligor
or to inspect the property (including the books and records) of any Obligor; (v)
shall not be responsible to any Issuing Bank or any Lender for the due
execution, legality, validity, enforceability, genuineness, sufficiency or value
of any Basic Document or any other instrument or document furnished pursuant
hereto; and (vi) shall incur no liability under or in respect of any Basic
Document by acting upon any notice, consent, certificate or other instrument or
writing (which may be by telegram, telecopy, cable or telex) believed by it to
be genuine and signed or sent by the proper party or parties.

          Section 7.03.  Citibank and Affiliates. With respect to its
                         -----------------------
Commitment, the Advances made by it and the Note issued to it, Citibank shall
have the same rights and powers under the Basic Documents as any other Lender
and may exercise the same as though it were not the Administrative Agent or the
Collateral Agent; and the term "Lender" or "Lenders" shall, unless otherwise
expressly indicated, include Citibank in its individual capacity. Citibank and
its Affiliates may accept deposits from, lend money to, act as trustee under
indentures for, accept investment banking engagements from and generally engage
in any kind of business with, any Obligor, any of its Subsidiaries, any of its
Affiliates and any Person who may do business with or own securities of any
Obligor or any such Subsidiary or Affiliate, all as if Citibank were not the
Administrative Agent and without any duty to account therefor to the Lenders or
any Issuing Bank.

          Section 7.04.  Lender Credit Decision. Each Lender and each Issuing
                         ----------------------
Bank acknowledges that it has, independently and without reliance upon the
Administrative Agent, any Issuing Bank or any other Lender and based on the
financial statements referred to in Section 4.01 and such other documents and
information as it has deemed appropriate, made its own credit analysis and
decision to enter into this Agreement. Each Lender and each Issuing Bank also
acknowledges that it will, independently and without reliance upon the
Administrative
<PAGE>

                                      -96-

Agent, any Issuing Bank or any other Lender and based on such documents and
information as it shall deem appropriate at the time, continue to make its own
credit decisions in taking or not taking action under this Agreement.

          Section 7.05.  Indemnification. The Lenders agree to indemnify the
                         ---------------
Administrative Agent (to the extent not promptly reimbursed by the Borrower),
ratably according to the principal amounts of the Note then held by each of them
(or if no Advances are at the time outstanding, ratably according to the amounts
of their Commitments), from and against any and all liabilities, obligations,
losses, damages, penalties, actions, judgments, suits, costs, expenses or
disbursements of any kind or nature whatsoever that may be imposed on, incurred
by, or asserted against any of them in any way relating to or arising out of the
Basic Documents or any action taken or omitted by any of them under the Basic
Documents; provided that no Lender shall be liable for any portion of such
           --------
liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs, expenses or disbursements resulting from the gross negligence or willful
misconduct of the Administrative Agent. Without limitation of the foregoing,
each Lender agrees to reimburse (x) the Administrative Agent promptly upon
demand for its ratable share of any costs and expenses payable by the Borrower
under Section 9.04 of this Agreement and (y) the Collateral Agent under the
Security Documents, in each case to the extent that the Administrative Agent or
the Collateral Agent, as the case may be, is not promptly reimbursed for such
costs and expenses by the Borrower.

          Section 7.06.  Collateral Duties.
                         -----------------

          (a)  Except for action expressly required of the Administrative Agent
hereunder and under the other Basic Documents, the Administrative Agent shall in
all cases be fully justified in refusing to act hereunder and thereunder unless
it shall be further indemnified to its satisfaction by the Lenders and the
Issuing Banks proportionately in accordance with the Obligations then due and
payable to each of them against any and all liability and expense that may be
incurred by it by reason of taking or continuing to take any such action.

          (b)  Except as expressly provided herein, the Administrative Agent
shall have no duty to take any affirmative steps with respect to the collection
of amounts payable in respect of the Collateral. The Administrative Agent shall
incur no liability as a result of any private sale of the Collateral.

          (c)  The Lenders and the Issuing Banks hereby consent, and agree upon
written request by the Collateral Agent or the Administrative Agent to execute
and deliver such instruments and other documents as the Collateral Agent or
Administrative Agent may deem desirable to confirm such consent, to the release
of the Liens on any of the Collateral, including any release in connection with
any sale, transfer or other disposition of the Collateral or any part thereof in
accordance with the Basic Documents.

          (d)  The parties hereto acknowledge that each of the Collateral Agent
and the Administrative Agent shall be deemed to have exercised reasonable care
in the custody and
<PAGE>

                                      -97-

preservation of the Collateral in its possession if the Collateral is accorded
treatment substantially equal to that which the Collateral Agent or the
Administrative Agent, as the case may be, accords its own property, it being
understood that none of the Collateral Agent, the Administrative Agent, any
Lender or any Issuing Bank shall have responsibility for (a) ascertaining or
taking action with respect to calls, conversions, exchanges, maturities, tenders
or other matters relative to any Collateral, whether or not the Collateral
Agent, Administrative Agent, any Lender or any Issuing Bank has or is deemed to
have knowledge of such matters, or (b) taking any necessary steps to preserve
rights against any parties with respect to any Collateral.

          Section 7.07.  Successor Administrative Agent. The Administrative
                         ------------------------------
Agent may resign at any time by giving written notice thereof to the Issuing
Banks, the Lenders and the Borrower and may be removed at any time with or
without cause by the Required Lenders. Upon any such resignation or removal, the
Required Lenders shall have the right to appoint (subject, so long as no Default
or Event of Default has occurred and is continuing, to the consent of the
Borrower, which consent shall not be unreasonably withheld) a successor
Administrative Agent. If no successor Administrative Agent shall have been so
appointed by the Required Lenders, and shall have accepted such appointment,
within 30 days after the retiring Administrative Agent's giving of notice of
resignation or the Required Lenders' removal of the Administrative Agent, as the
case may be, then the retiring Administrative Agent may, on behalf of the
Issuing Banks and the Lenders, appoint (subject, so long as no Default or Event
of Default has occurred and is continuing, to the consent of the Borrower, which
consent shall not be unreasonably withheld) a successor Administrative Agent,
which shall be an Initial Lender or a commercial bank organized under the laws
of the United States or of any State thereof and having a combined capital and
surplus of at least $500,000,000. Upon the acceptance of any appointment as
Administrative Agent hereunder by a successor Administrative Agent such
successor Administrative Agent shall succeed to and become vested with all the
rights, powers, discretion, privileges and duties of the retiring Administrative
Agent, as the case may be, and such retiring Administrative Agent shall be
discharged from its duties and obligations under the Basic Documents. After any
retiring Administrative Agent's resignation or removal hereunder as
Administrative Agent, the provisions of this Article VII shall inure to the
benefit of the Administrative Agent as to any actions taken or omitted to be
taken by it while it was Administrative Agent under this Agreement and under the
Security Documents.

                                 ARTICLE VIII

                                 THE GUARANTEE

          Section 8.01.  The Guarantee. The Guarantors hereby jointly and
                         -------------
severally guarantee to each Lender, each Issuing Bank and the Administrative
Agent and their respective successors and assigns the prompt payment in full
when due (whether at stated maturity, by acceleration or otherwise) of the
principal of and interest on the Advances made by the Lenders to, and the Note
held by each Lender of, the Company and all other amounts from time to time
owing to the Lenders, each Issuing Bank or the Administrative Agent by the
Company under this
<PAGE>

                                      -98-

Agreement and under the Notes and by any Obligor under any of the other Loan
Documents, in each case strictly in accordance with the terms thereof (such
obligations being herein collectively called the "Guaranteed Obligations"). The
Guarantors hereby further jointly and severally agree that if the Company shall
fail to pay in full when due (whether at stated maturity, by acceleration or
otherwise) any of the Guaranteed Obligations, the Guarantors will promptly pay
the same, without any demand or notice whatsoever, and that in the case of any
extension of time of payment or renewal of any of the Guaranteed Obligations,
the same will be promptly paid in full when due (whether at extended maturity,
by acceleration or otherwise) in accordance with the terms of such extension or
renewal.

          Section 8.02.  Obligations Unconditional.
                         -------------------------

          (a)  The obligations of the Guarantors under Section 8.01 are absolute
and unconditional, joint and several, irrespective of the value, genuineness,
validity, regularity or enforceability of the obligations of the Company under
this Agreement, the Notes or any other agreement or instrument referred to
herein or therein, or any substitution, release or exchange of any other
guarantee of or security for any of the Guaranteed Obligations, and, to the
fullest extent permitted by applicable law, irrespective of any other
circumstance whatsoever that might otherwise constitute a legal or equitable
discharge or defense of a surety or guarantor, it being the intent of this
Section 8.02 that the obligations of the Guarantors hereunder shall be absolute
and unconditional, joint and several, under any and all circumstances.

          (b)  Without limiting the generality of the foregoing clause (a), it
is agreed that the occurrence of any one or more of the following shall not
alter or impair the liability of the Guarantors hereunder which shall remain
absolute and unconditional as described above:

          (i)   at any time or from time to time, without notice to the
     Guarantors, the time for any performance of or compliance with any of the
     Guaranteed Obligations shall be extended, or such performance or compliance
     shall be waived;

          (ii)  any of the acts mentioned in any of the provisions of this
     Agreement or the Notes or any other agreement or instrument referred to
     herein or therein shall be done or omitted;

          (iii) the maturity of any of the Guaranteed Obligations shall be
     accelerated, or any of the Guaranteed Obligations shall be modified,
     supplemented or amended in any respect, or any right under this Agreement
     or the Notes or any other agreement or instrument referred to herein or
     therein shall be waived or any other guarantee of any of the Guaranteed
     Obligations or any security therefor shall be released or exchanged in
     whole or in part or otherwise dealt with; or

          (iv)  any lien or security interest granted to, or in favor of, the
     Administrative Agent, any Issuing Bank or any Lender as security for any of
     the Guaranteed Obligations shall fail to be perfected.
<PAGE>

                                      -99-

The Guarantors hereby expressly waive diligence, presentment, demand of payment,
protest and all notices whatsoever, and any requirement that the Administrative
Agent, any Issuing Bank or any Lender exhaust any right, power or remedy or
proceed against the Borrower under this Agreement or the Notes or any other
agreement or instrument referred to herein or therein, or against any other
Person under any other guarantee of, or security for, any of the Guaranteed
Obligations.

          Section 8.03.  Reinstatement.  The obligations of the Guarantors under
                         -------------
this Article VIII shall be automatically reinstated if and to the extent that
for any reason any payment by or on behalf of the Borrower in respect of the
Guaranteed Obligations is rescinded or must be otherwise restored by any holder
of any of the Guaranteed Obligations, whether as a result of any proceedings in
bankruptcy or reorganization or otherwise, and the Guarantors jointly and
severally agree that they will indemnify the Administrative Agent, each Issuing
Bank and each Lender on demand for all reasonable costs and expenses (including,
without limitation, fees of counsel) incurred by the Administrative Agent, such
Issuing Bank or such Lender in connection with such rescission or restoration,
including any such costs and expenses incurred in defending against any claim
alleging that such payment constituted a preference, fraudulent transfer or
similar payment under any bankruptcy, insolvency or similar law.

          Section 8.04.  Subrogation.  To the extent that, as a result of this
                         -----------
Article VIII, any Lender or Issuing Bank would be subject to an extended
preference period under Section 547 of the Bankruptcy Code, each Guarantor
hereby waives all rights of subrogation, whether arising by contract or
operation of law (including, without limitation, any such right arising under
the Bankruptcy Code) or otherwise, by reason of any payment by it pursuant to
the provisions of this Article VIII and agrees with the Borrower for the benefit
of each of its creditors (including, without limitation, each Lender, each
Issuing Bank and the Administrative Agent) that any such payment by it shall
constitute a contribution of capital by such Guarantor to the Borrower (or an
investment in the equity capital of the Borrower by such Guarantor).

          Section 8.05.  Remedies.  The Guarantors jointly and severally agree
                         --------
that, as between the Guarantors and the Lenders and the Issuing Banks, the
obligations of the Borrower under this Agreement and the Notes may be declared
to be forthwith due and payable as provided in Article VI (and shall be deemed
to have become automatically due and payable in the circumstances provided in
said Article VI) for purposes of Section 8.01 notwithstanding any stay,
injunction or other prohibition preventing such declaration (or such obligations
from becoming automatically due and payable) as against the Borrower and that,
in the event of such declaration (or such obligations being deemed to have
become automatically due and payable), such obligations (whether or not due and
payable by the Borrower) shall forthwith become due and payable by the
Guarantors for purposes of said Section 8.01.

          Section 8.06.  Instrument for the Payment of Money. Each Guarantor
                         -----------------------------------
hereby acknowledges that the guarantee in this Article VIII constitutes an
instrument for the payment of money, and consents and agrees that any Lender,
any Issuing Bank or the Administrative Agent,
<PAGE>

                                     -100-

at its sole option, in the event of a dispute by such Guarantor in the payment
of any moneys due hereunder, shall have the right to bring motion-action under
New York CPLR Section 3213.

          Section 8.07.  Continuing Guarantee.  The guarantee in this Article
                         --------------------
VIII is a continuing guarantee, and shall apply to all Guaranteed Obligations
whenever arising.

          Section 8.08.  Rights of Contribution. The Subsidiary Guarantors
                         ----------------------
hereby agree, as between themselves, that if any Subsidiary Guarantor shall
become an Excess Funding Guarantor (as defined below) by reason of the payment
by such Subsidiary Guarantor of any Guaranteed Obligations, each other
Subsidiary Guarantor shall, on demand of such Excess Funding Guarantor (but
subject to the next sentence), pay to such Excess Funding Guarantor an amount
equal to such Subsidiary Guarantor's Pro Rata Portion (as defined below and
determined, for this purpose, without reference to the properties, debts and
liabilities of such Excess Funding Guarantor) of the Excess Payment (as defined
below) in respect of such Guaranteed Obligations. The payment obligation of a
Subsidiary Guarantor to any Excess Funding Guarantor under this Section 8.08
shall be subordinate and subject in right of payment to the prior payment in
full of the obligations of such Subsidiary Guarantor under the other provisions
of this Article VIII and such Excess Funding Guarantor shall not exercise any
right or remedy with respect to such excess until payment and satisfaction in
full of all of such obligations.

          For purposes of this Section 8.08, (i) "Excess Funding Guarantor"
                                                  ------------------------
shall mean, in respect of any Guaranteed Obligations, a Subsidiary Guarantor
that has paid an amount in excess of its Pro Rata Portion of such Guaranteed
Obligations, (ii) "Excess Payment" shall mean, in respect of any Guaranteed
                   --------------
Obligations, the amount paid by an Excess Funding Guarantor in excess of its Pro
Rata Portion of such Guaranteed Obligations and (iii) "Pro Rata Portion" shall
                                                       ----------------
mean, for any Subsidiary Guarantor, the ratio (expressed as a percentage) of (x)
the amount by which the aggregate present fair saleable value of all properties
of such Subsidiary Guarantor (excluding any shares of stock of any other
Subsidiary Guarantor) exceeds the amount of all the debts and liabilities of
such Subsidiary Guarantor (including contingent, subordinated, unmatured and
unliquidated liabilities, but excluding the obligations of such Subsidiary
Guarantor hereunder and any obligations of any other Subsidiary Guarantor that
have been Guaranteed by such Subsidiary Guarantor) to (y) the amount by which
the aggregate fair saleable value of all properties of the Company and all of
the Subsidiary Guarantors exceeds the amount of all the debts and liabilities
(including contingent, subordinated, unmatured and unliquidated liabilities, but
excluding the obligations of the Company and the Subsidiary Guarantors
hereunder) of the Company and all of the Subsidiary Guarantors, all as of the
Restatement Date. If any Subsidiary becomes a Subsidiary Guarantor hereunder
subsequent to the Restatement Date, then for purposes of this Section 8.08 such
subsequent Subsidiary Guarantor shall be deemed to have been a Subsidiary
Guarantor as of the Restatement Date and the aggregate present fair saleable
value of the properties, and the amount of the debts and liabilities, of such
Subsidiary Guarantor as of the Restatement Date shall be deemed to be equal to
such value and amount on the date such Subsidiary Guarantor becomes a Subsidiary
Guarantor hereunder.
<PAGE>

                                     -101-

          Section 8.09.  General Limitation on Guarantee Obligations. In any
                         -------------------------------------------
action or proceeding involving any state corporate law, or any state or Federal
bankruptcy, insolvency, reorganization or other law affecting the rights of
creditors generally, if the obligations of any Guarantor under Section 8.01
would otherwise, taking into account the provisions of Section 8.08, be held or
determined to be void, invalid or unenforceable, or subordinated to the claims
of any other creditors, on account of the amount of its liability under said
Section 8.01, then, notwithstanding any other provision hereof to the contrary,
the amount of such liability shall, without any further action by such
Guarantor, any Lender, any Issuing Bank, the Administrative Agent or any other
Person, be automatically limited and reduced to the highest amount that is valid
and enforceable and not subordinated to the claims of other creditors as
determined in such action or proceeding.

                                  ARTICLE IX

                                 MISCELLANEOUS

          Section 9.01.  Amendments, Consents, Etc.
                         --------------------------

          (a)  No amendment or waiver of any provision of this Agreement, the
Notes or the other Basic Documents, nor any consent to any departure by any
Obligor from any provision of this Agreement, the Notes or the other Basic
Documents, shall in any event be effective unless the same shall be in writing
and signed by the Required Lenders, and then such waiver or consent shall be
effective only in the specific instance and for the specific purpose for which
given; provided that:
       --------

          (i)  no amendment, waiver or consent shall, unless in writing and
     signed by all the Lenders, do any of the following:

                  (1)  waive any of the conditions specified in Section 3.01;

                  (2)  change the percentage of the Commitments or of the
          aggregate unpaid principal amount of the Advances, or the number or
          percentage of Lenders, that shall be required for the Lenders or any
          of them to take any action hereunder;

                  (3)  amend this Section 9.01;

                  (4)  reduce the principal of, or interest on, the Notes or any
          fees or other amounts payable hereunder;

                  (5)  postpone any date fixed for any payment of principal of,
          or interest on, the Notes or any fees or other amounts payable
          hereunder or amend Section 2.03 or 2.05;

                  (6)  release any Guarantor from its obligations under Article
          VIII; or
<PAGE>

                                     -102-

                  (7)  amend, modify or supplement the Intercreditor Agreement;

          (ii) no amendment, waiver or consent shall, unless in writing and
     signed by the Required Lenders and each Lender that would be adversely
     affected by such amendment, waiver or consent:

                  (1)  increase the Commitment of such Lender or subject such
          Lender to any additional obligations;

                  (2)  reduce the principal of, or interest on, the Notes held
          by such Lender or any fees or other amounts payable hereunder to such
          Lender;

                  (3)  postpone any date fixed for any payment of principal of,
          or interest on, the Notes held by such Lender or any fees or other
          amounts payable hereunder to such Lender; or

                  (4)  change the order of application of any prepayment set
          forth in Section 2.05 in any manner that materially affects such
          Lender; and

          (iii) no amendment, waiver or consent shall, unless in writing and (x)
     signed by the Administrative Agent in addition to the Lenders required
     above to take such action, affect the rights or duties of the
     Administrative Agent under this Agreement, any Note or any other Basic
     Document, and (y) signed by each Issuing Bank in addition to the Lenders
     required to take such action, amend Section 2.07, 2.13 or 3.02, increase
     the Letter of Credit Sublimit or otherwise affect the rights or obligations
     of any Issuing Bank under this Agreement.

          (b)  Except as otherwise provided in the Security Documents or the
Intercreditor Agreement, the Administrative Agent shall not consent to release
any Collateral or terminate any Lien under any Security Document unless such
release or termination shall be consented to in writing by Lenders owed or
holding in the aggregate at least 75% of the sum of the then aggregate unpaid
principal amount of the Advances, the then aggregate Unused Commitments and the
aggregate Available Amount of all Letters of Credit (for which purposes the
Available Amount of each Letter of Credit shall be considered to be owed to the
Lenders according to their respective Pro Rata Shares under which such Letter of
Credit has been issued); provided that:

          (1)  the consent of all Lenders shall be required to release all or
     substantially all of the Collateral, except upon the termination of the
     Liens created by each of the Security Documents in accordance with the
     terms thereof; and

          (2)  no such consent shall be required to release any Lien covering
     property that is the subject of a disposition of property permitted
     hereunder and, upon such a permitted disposition, such property shall be
     deemed to be transferred free and clear of the Lien of
<PAGE>

                                     -103-

     the Security Documents without any action on the part of any party (and the
     Administrative Agent is hereby authorized to execute such releases and
     other documents, and to take such other action, as the Company may
     reasonably request to give effect thereto).

          Section 9.02.  Notices, Etc.  All notices and other communications
                         -------------
provided for hereunder shall be in writing (including telecopy communication)
and mailed, telecopied or delivered:

          (a)  if to any Obligor, care of Terra Industries Inc., 600 Fourth
     Street, Sioux City, Iowa 51102, Attention: Francis G. Meyer, Senior Vice
     President and Chief Financial Officer, telephone number (712) 279-8790;
     telecopier number (712) 279-8703;

          (b)  if to any Lender, to it at its address (or telecopy number) set
     forth in its Administrative Questionnaire;

          (c)  if to any Issuing Bank, at its address beneath its signature
     hereto;

          (d)  if to the Administrative Agent, at its address at 2 Penns Way,
     Suite 200, New Castle, Delaware, 19720, Attention: Jacqueline Roman (or her
     successor), telephone number (302) 894-6007, telecopier number (302) 894-
     6120;

or, as to each party, at such other address as shall be designated by such party
in a written notice to the other parties. All such notices and communications
shall, when mailed or telecopied, be effective when deposited in the mails or
transmitted by telecopier, respectively, except that notices and communications
to the Administrative Agent pursuant to Article II, III or VII shall not be
effective until received by the Administrative Agent.

          Section 9.03.  No Waiver; Remedies.  No failure on the part of any
                         -------------------
Lender, any Issuing Bank or the Administrative Agent to exercise, and no delay
in exercising, any right hereunder or under any Note shall operate as a waiver
thereof; nor shall any single or partial exercise of any such right preclude any
other or further exercise thereof or the exercise of any other right. The
remedies herein provided are cumulative and not exclusive of any remedies
provided by law.

          Each Obligor irrevocably waives, to the fullest extent permitted by
applicable law, any claim that any action or proceeding commenced by the
Administrative Agent, any Issuing Bank or any Lender relating in any way to this
Agreement should be dismissed or stayed by reason, or pending the resolution, of
any action or proceeding commenced by any Obligor relating in any way to this
Agreement whether or not commenced earlier. To the fullest extent permitted by
applicable law, the Obligors shall take all measures necessary for any such
action or proceeding commenced by the Administrative Agent, any Issuing Bank or
any Lender to proceed to judgment prior to the entry of judgment in any such
action or proceeding commenced by any Obligor.
<PAGE>

                                     -104-

          Section 9.04.  Costs, Expenses and Indemnification.
                         -----------------------------------

          (a)  The Borrower agrees to pay on demand (i) all costs and expenses
of the Administrative Agent, the Issuing Banks and the Lenders in connection
with the preparation, execution, delivery, administration, modification and
amendment of the Basic Documents including, without limitation, (A) all due
diligence, syndication (including printing, distribution and bank meetings),
transportation, computer, duplication, appraisal, insurance, consultant, search,
filing and recording fees and expenses, ongoing audit expenses and all other
reasonable out-of-pocket expenses incurred by the Administrative Agent
(including the reasonable and documented fees and expenses of Milbank, Tweed,
Hadley & McCloy LLP, special counsel to Citibank, but not, under this clause (A)
or clause (B) below, of any other counsel) whether or not any of the
transactions contemplated by this Agreement are consummated, (B) the reasonable
and documented fees and expenses of counsel for the Administrative Agent with
respect thereto, with respect to advising the Administrative Agent as to its
rights and responsibilities, or the perfection, protection or preservation of
rights or interests, under the Basic Documents, and (C) with respect to
negotiations with any Obligor or with other creditors of any Obligor or any of
its Subsidiaries arising out of any Default or Event of Default or any events or
circumstances that may reasonably be expected to give rise to a Default or Event
of Default and with respect to presenting claims in or otherwise participating
in or monitoring any bankruptcy, insolvency or other similar proceeding
involving creditors' rights generally and any proceeding ancillary thereto) and
(ii) all costs and expenses of the Administrative Agent, the Issuing Banks and
the Lenders in connection with the enforcement of the Basic Documents, whether
in any action, suit or litigation, any bankruptcy, insolvency or other similar
proceeding affecting creditors' rights generally or otherwise (including,
without limitation, the reasonable and documented fees and expenses of counsel
for the Administrative Agent, each Issuing Bank and each Lender with respect
thereto).

          (b)  The Borrower agrees to indemnify and hold harmless the
Administrative Agent, each Issuing Bank and each Lender and each of their
Affiliates and their officers, directors, employees, agents and advisors (each,
an "Indemnified Party") from and against any and all claims, damages, losses,
liabilities and expenses (including, without limitation, reasonable fees and
expenses of counsel) that may be incurred by or asserted or awarded against any
Indemnified Party, in each case arising out of or in connection with or by
reason of, or in connection with the preparation for a defense of, any
investigation, litigation or proceeding arising out of, related to or in
connection with the Covered Transactions or the actual or alleged presence of
Hazardous Materials on any property owned by an Obligor or any Environmental
Action relating in any way to any Obligor or any of its Subsidiaries, in each
case whether or not such investigation, litigation or proceeding is brought by
any Obligor, its directors, shareholders or creditors or an Indemnified Party or
any Indemnified Party is otherwise a party thereto and whether or not the
Covered Transactions or the other transactions contemplated hereby are
consummated, except to the extent such claim, damage, loss, liability or expense
is found in a final, non-appealable judgment by a court of competent
jurisdiction to have resulted from such Indemnified Party's gross negligence or
willful misconduct. The Borrower also agrees not to
<PAGE>

                                     -105-

assert any claim against the Administrative Agent, any Issuing Bank, any Lender,
any of their Affiliates, or any of their respective directors, officers,
employees, attorneys and agents, on any theory of liability, for special,
indirect, consequential or punitive damages arising out of or otherwise relating
to the Covered Transactions or any part thereof or the other transactions
contemplated herein or in any other Basic Document or the actual or proposed use
of the proceeds of the Advances. For purposes of this Section 9.04(b), the term
"non-appealable" includes any judgment as to which all appeals have been taken
or as to which the time for taking an appeal shall have expired.

          (c)  If any payment of principal of, or Conversion of, any Eurodollar
Rate Advance is made by the Borrower to or for the account of a Lender other
than on the last day of the Interest Period for such Advance, as a result of a
payment or Conversion pursuant to Section 2.03, 2.05, 2.08(b)(i) or 2.09(d) or
as the result of acceleration of the maturity of the Notes pursuant to Section
6.01 or for any other reason, the Borrower shall, upon demand by such Lender
(with a copy of such demand to the Administrative Agent), pay to the
Administrative Agent for the account of such Lender any amounts required to
compensate such Lender for any additional losses, costs or expenses that it may
reasonably incur as a result of such payment, including, without limitation, any
loss (including loss of anticipated profits), cost or expense incurred by reason
of the liquidation or reemployment of deposits or other funds acquired by any
Lender to fund or maintain such Advance.

          (d)  If any Obligor fails to pay when due any costs, expenses or other
amounts payable by it under any Loan Document, including, without limitation,
reasonable and documented fees and expenses of counsel and indemnities, such
amount may be paid on behalf of such Obligor by the Administrative Agent or any
Lender, in its sole discretion.

          Section 9.05.  Right of Setoff. Upon (a) the occurrence and during the
                         ---------------
continuance of any Event of Default and (b) the making of the request or the
granting of the consent specified by Section 6.01 to authorize the
Administrative Agent to declare the Notes due and payable pursuant to the
provisions of Section 6.01, each Lender is hereby authorized at any time and
from time to time, to the fullest extent permitted by law, to set off and
otherwise apply any and all deposits (general or special, time or demand,
provisional or final) at any time held and other indebtedness at any time owing
by such Lender to or for the credit or the account of the Borrower against any
and all of the Obligations of the Borrower now or hereafter existing under this
Agreement and the Note held by such Lender, irrespective of whether such Lender
shall have made any demand under this Agreement or such Note and although such
obligations may be unmatured. Each Lender agrees promptly to notify the Borrower
after any such setoff and application; provided that the failure to give such
notice shall not affect the validity of such setoff and application. The rights
of each Lender under this Section are in addition to other rights and remedies
(including, without limitation, other rights of setoff) that such Lender may
have.

          Section 9.06.  Governing Law; Submission to Jurisdiction.  This
                         -----------------------------------------
Agreement and the Notes shall be governed by, and construed in accordance with,
the law of the State of New
<PAGE>

                                     -106-


York. Each Obligor hereby submits to the nonexclusive jurisdiction of the United
States District Court for the Southern District of New York and of any New York
state court sitting in New York City for the purposes of all legal proceedings
arising out of or relating to this Agreement or the transactions contemplated
hereby. Each Obligor irrevocably waives, to the fullest extent permitted by
applicable law, any objection that it may now or hereafter have to the laying of
the venue of any such proceeding brought in such a court and any claim that any
such proceeding brought in such a court has been brought in an inconvenient
forum.

          Section 9.07.  Assignments and Participations.
                         ------------------------------

          (a) Each Lender may assign to one or more banks or other
entities all or a portion of its rights and obligations under this Agreement
(including, without limitation, all or a portion of its Commitments, the
Advances owing to it and the Note held by it); provided that:
                                               --------

                 (i)    except in the case of an assignment to a Person that,
          immediately prior to such assignment, was a Lender or an affiliate of
          a Lender or an assignment of all of a Lender's rights and obligations
          under this Agreement, the amount of the Commitment of the assigning
          Lender being assigned pursuant to each such assignment (determined as
          of the date of the Assignment and Acceptance with respect to such
          assignment) shall in no event be less than the lesser of (x) such
          Lender's Commitment hereunder and (y) $5,000,000 or an integral
          multiple of $1,000,000 in excess thereof (except as otherwise agreed
          by the Borrower and the Administrative Agent),

                 (ii)   except in the case of an assignment to a Person that,
          immediately prior to such assignment, was a Lender or an affiliate of
          a Lender, each such assignment shall be made only upon the prior
          written approval of the Borrower, the Administrative Agent and each
          Issuing Bank, such approval not to be unreasonably withheld,

                 (iii)  each such assignment shall be to an Eligible Assignee,

                 (iv)   each such assignment by a Lender of its Advances,
          Commitment or Note hereunder shall be made in such manner so that the
          same portion of its Advances, Commitment and Note hereunder is
          assigned to the respective assignee,

                 (v)    the parties to each such assignment shall execute and
          deliver to the Administrative Agent, for its acceptance and recording
          in the Register, an Assignment and Acceptance, together with the Note
          subject to such assignment and a processing and recordation fee in the
          aggregate amount of $3,000, and

                 (vi)   the assignee, if it shall not be a Lender, shall deliver
          to the Administrative Agent an Administrative Questionnaire.
<PAGE>

                                     -107-

Upon such execution, delivery, acceptance and recording, from and after the
effective date specified in such Assignment and Acceptance, (x) the assignee
thereunder shall be a party hereto and, to the extent that rights and
obligations hereunder have been assigned to it pursuant to such Assignment and
Acceptance, have the rights and obligations of a Lender hereunder and (y) the
Lender assignor thereunder shall, to the extent that rights and obligations
hereunder have been assigned by it pursuant to such Assignment and Acceptance,
relinquish its rights and be released from its obligations under this Agreement
(and, in the case of an Assignment and Acceptance covering all or the remaining
portion of an assigning Lender's rights and obligations under this Agreement,
such Lender shall cease to be a party hereto).

          (b) By executing and delivering an Assignment and Acceptance, the
Lender assignor thereunder and the assignee thereunder confirm to and agree with
each other and the other parties hereto as follows: (i) other than as provided
in such Assignment and Acceptance, such assigning Lender makes no representation
or warranty and assumes no responsibility with respect to any statements,
warranties or representations made in or in connection with this Agreement or
the execution, legality, validity, enforceability, genuineness, sufficiency or
value of this Agreement or any other instrument or document furnished pursuant
hereto; (ii) such assigning Lender makes no representation or warranty and
assumes no responsibility with respect to the financial condition of any Obligor
or the performance or observance by the Obligors of any of their respective
obligations under this Agreement or any other instrument or document furnished
pursuant hereto; (iii) such assignee confirms that it has received a copy of
this Agreement, together with copies of the financial statements referred to in
Section 4.01 and such other documents and information as it has deemed
appropriate to make its own credit analysis and decision to enter into such
Assignment and Acceptance; (iv) such assignee will, independently and without
reliance upon the Administrative Agent, such assigning Lender or any other
Lender and based on such documents and information as it shall deem appropriate
at the time, continue to make its own credit decisions in taking or not taking
action under this Agreement; (v) such assignee confirms that it is an Eligible
Assignee; (vi) such assignee appoints and authorizes the Administrative Agent to
take such action as agent on its behalf and to exercise such powers and
discretion under this Agreement as are delegated to the Administrative Agent by
the terms hereof, together with such powers and discretion as are reasonably
incidental thereto; and (vii) such assignee agrees that it will perform in
accordance with their terms all of the obligations that by the terms of this
Agreement are required to be performed by it as a Lender.

          (c) The Administrative Agent, acting for this purpose as an agent of
the Borrower, shall maintain at its address referred to in Section 9.02 a copy
of each Assignment and Acceptance delivered to and accepted by it and a register
for the recordation of the names and addresses of the Lenders and the Commitment
of, and principal amount of the Advances owing to, each Lender from time to time
(the "Register"). The entries in the Register shall be conclusive and binding
      --------
for all purposes, absent manifest error, and the Borrower, the Administrative
Agent and the Lenders shall treat each Person whose name is recorded in the
Register as a Lender hereunder for all purposes of this Agreement. No assignment
shall be
<PAGE>

                                     -108-

effective until it is recorded in the Register pursuant to this Section 9.07(c).
The Register shall be available for inspection by the Borrower or any Lender at
any reasonable time and from time to time upon reasonable prior notice.

          (d) Upon its receipt of an Assignment and Acceptance executed by an
assigning Lender and an assignee, together with the Note subject to such
assignment, and the assignee's completed Administrative Questionnaire (unless
the assignee shall already be a Lender hereunder), the Administrative Agent
shall, if such Assignment and Acceptance has been completed and is in
substantially the form of Exhibit F hereto, (i) accept such Assignment and
Acceptance, (ii) record the information contained therein in the Register and
(iii) give prompt notice thereof to the Borrower. Within five Business Days
after its receipt of such notice, the Borrower, at its own expense, shall
execute and deliver to the Administrative Agent in exchange for the surrendered
Note a new Note to the order of such assignee in an amount equal to the portion
of the Advances assumed by it pursuant to such Assignment and Acceptance and, if
the assigning Lender has retained a portion of its Advances, a new Note to the
order of the assigning Lender in an amount equal to the portion so retained by
it hereunder. Such new Note shall be in an aggregate principal amount equal to
the aggregate principal amount of such surrendered Note, shall be dated the
effective date of such Assignment and Acceptance and shall otherwise be in
substantially the form of Exhibit A.

          (e) Each Lender may sell participations in or to all or a portion of
its rights and/or obligations under this Agreement (including, without
limitation, all or a portion of its Commitment or the Advances owing to it and
the Note held by it); provided that (i) such Lender's obligations under this
                      --------
Agreement (including, without limitation, its Commitment) shall remain
unchanged, (ii) such Lender shall remain solely responsible to the other parties
hereto for the performance of such obligations, (iii) such Lender shall remain
the holder of such Note for all purposes of this Agreement, (iv) the Obligors,
the Administrative Agent, the Issuing Banks and the other Lenders shall continue
to deal solely and directly with such Lender in connection with such Lender's
rights and obligations under this Agreement and (v) no participant under any
such participation shall have any right to approve any amendment or waiver of
any provision of any Basic Document, or any consent to any departure by any
Obligor therefrom, except to the extent that such amendment, waiver or consent
would reduce the principal of, or interest on, the Notes or any fees or other
amounts payable hereunder, in each case to the extent subject to such
participation, postpone any date fixed for any payment of principal of, or
interest on, the Notes or any fees or other amounts payable hereunder, in each
case to the extent subject to such participation, or release all or
substantially all of the Collateral.

          (f) Any Issuing Bank may (subject to the prior written consent of
Terra, such consent not to be unreasonably withheld) assign all or any portion
of its rights and obligations under this Agreement to one or more successor
Issuing Banks that is a commercial bank organized under the laws of the United
States, or any state thereof, and having total assets in excess of
$1,000,000,000 and, upon the acceptance of such assignment, the respective
successor Issuing Banks shall succeed to such portion of such rights and
obligations and such assigning
<PAGE>

                                     -109-

Issuing Bank shall be discharged from its duties and obligations under this
Agreement to such extent, including, without limitation, such portion of its
Letter of Credit Commitment.

          (g) Any Issuing Bank and any Lender may, in connection with any
assignment or participation or proposed assignment or participation pursuant to
this Section 9.07, disclose to the assignee or participant or proposed assignee
or participant, any information relating to the Borrower furnished to such
Lender by or on behalf of the Borrower; provided that, prior to any such
                                        --------
disclosure, the assignee or participant or proposed assignee or participant
shall agree in writing to preserve the confidentiality of any Confidential
Information received by it from such Issuing Bank or Lender.

          (h) Notwithstanding any other provision set forth in this Agreement,
any Lender may at any time create a security interest in all or any portion of
its rights under this Agreement (including, without limitation, the Advances
owing to it and the Note held by it) in favor of any Federal Reserve Bank in
accordance with Regulation A of the Board of Governors of the Federal Reserve
System.

          (i) Anything in this Section 9.07 to the contrary notwithstanding,
each Lender shall be permitted to pledge all or any part of its right, title and
interest in, to and under the Advances and Note held by it to any trustee for
the benefit of the holders of such Lender's securities.

          (j) Anything in this Section 9.07 to the contrary notwithstanding,
neither Terra nor any of its Subsidiaries or Affiliates may acquire (whether by
assignment, participation or otherwise), and no Lender or Issuing Bank shall
assign or participate to Terra or any of its Subsidiaries or Affiliates, any
interest in any Commitment, Advance or other amount owing hereunder without the
prior consent of each Lender; provided that the Lenders and the Issuing Banks
                              --------
may assign all of their interests in the Commitments, Advances and such other
amounts pursuant to the Loan Purchase Agreement.

          Section 9.08.  Execution in Counterparts. This Agreement may be
                         -------------------------
executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed shall be deemed to be an
original and all of which taken together shall constitute one and the same
agreement. Delivery of an executed counterpart of a signature page to this
Agreement by telecopier shall be effective as delivery of a manually executed
counterpart of this Agreement.

          Section 9.09.  No Liability of the Issuing Banks. The Borrower assumes
                         ---------------------------------
all risks of the acts or omissions of any beneficiary or transferee of any
Letter of Credit with respect to its use of such Letter of Credit. Neither the
relevant Issuing Bank nor any of its officers or directors shall be liable or
responsible for: (a) the use that may be made of any Letter of Credit or any
acts or omissions of any beneficiary or transferee in connection therewith; (b)
the validity, sufficiency or genuineness of documents, or of any endorsement
thereon, even if such documents should prove to be in any or all respects
invalid, insufficient, fraudulent or forged; (c) payment by such
<PAGE>

                                     -110-

Issuing Bank against presentation of documents that do not comply with the terms
of a Letter of Credit, including failure of any documents to bear any reference
or adequate reference to the Letter of Credit; or (d) any other circumstances
whatsoever in making or failing to make payment under any Letter of Credit,
except that the Borrower shall have a claim against such Issuing Bank, and such
- ------
Issuing Bank shall be liable to the Borrower, to the extent of any direct, but
not consequential, damages suffered by the Borrower that the Borrower proves
were caused by (i) such Issuing Bank's willful misconduct or gross negligence in
determining whether documents presented under any Letter of Credit comply with
the terms of the Letter of Credit or (ii) such Issuing Bank's willful failure to
make lawful payment under a Letter of Credit after the presentation to it of a
draft and certificates strictly complying with the terms and conditions of the
Letter of Credit. In furtherance and not in limitation of the foregoing, such
Issuing Bank may accept documents that appear on their face to be in order,
without responsibility for further investigation, regardless of any notice or
information to the contrary.

          Section 9.10.  Confidentiality. Neither the Administrative Agent, any
                         ---------------
Issuing Bank nor any Lender shall disclose any Confidential Information to any
Person without the prior consent of the Company, other than (a) to the
Administrative Agent's, such Issuing Bank's or such Lender's Affiliates and
their officers, directors, employees, agents and advisors (including independent
auditors and counsel) and to actual or prospective assignees and participants,
and then only on a confidential basis, (b) as required by any law, rule or
regulation or judicial process, (c) as requested or required by any state,
federal or foreign authority or examiner regulating or having authority over
Lenders or the Lenders' respective activities and (d) in connection with credit
inquiries from suppliers of the Borrower and/or their Subsidiaries and other
Persons who, from time to time, inquire as to the creditworthiness of the
Borrower.

          Section 9.11.  WAIVER OF JURY TRIAL. EACH OF THE OBLIGORS, THE
                         --------------------
ADMINISTRATIVE AGENT, THE LENDERS AND THE ISSUING BANKS HEREBY IRREVOCABLY
WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM
(WHETHER BASED ON CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR RELATING TO ANY
OF THE BASIC DOCUMENTS, THE ADVANCES, THE LETTERS OF CREDIT OR THE ACTIONS OF
THE ADMINISTRATIVE AGENT, ANY LENDER OR ANY ISSUING BANK IN THE NEGOTIATION,
ADMINISTRATION, PERFORMANCE OR ENFORCEMENT THEREOF.

          Section 9.12.  Survival. The obligations of the Borrower under
                         --------
Sections 2.09, 2.11 and 9.04, the obligations of each Guarantor under Section
8.03, and the obligations of the Lenders under Section 7.05, shall survive the
repayment of the Advances and the termination of the Commitments. In addition,
each representation and warranty made, or deemed to be made by a notice of any
extension of credit (whether by means of an Advance or a Letter of Credit),
herein or pursuant hereto shall survive the making of such representation and
warranty, and no Lender or Issuing Bank shall be deemed to have waived, by
reason of making any extension of credit hereunder (whether by means of an
Advance or a Letter of Credit), any Default or Event of Default that may arise
by reason of such representation or warranty proving to have been false or
misleading, notwithstanding that such Lender, such Issuing Bank or the
Administrative Agent
<PAGE>

                                     -111-

may have had notice or knowledge or reason to believe that such representation
or warranty was false or misleading at the time such extension of credit was
made.

          Section 9.13.  Captions. The table of contents and captions and
                         --------
section headings appearing herein are included solely for convenience of
reference and are not intended to affect the interpretation of any provision of
this Agreement.

          Section 9.14.  Successors and Assigns. This Agreement shall be binding
                         ----------------------
upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns, provided that no Obligor may assign any of its
                                  --------
rights or obligations hereunder or under the other Basic Documents without the
prior consent of all of the Lenders, the Issuing Banks and the Administrative
Agent.
<PAGE>

                                     -112-

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                             THE BORROWER
                                             ------------

                                             TERRA CAPITAL, INC.



                                             By /s/ William D. Conner
                                               ---------------------------------
                                              Title: Vice President



                                             GUARANTORS
                                             ----------

                                             TERRA INDUSTRIES INC.



                                             By /s/ Francis G. Meyer
                                               ---------------------------------
                                              Title:  S.V.P. and C.F.O.



                                             TERRA CAPITAL HOLDINGS, INC.



                                             By /s/ William D. Conner
                                               ---------------------------------
                                              Title: Vice President



                                             TERRA NITROGEN CORPORATION



                                             By /s/ George Valentine
                                               ---------------------------------
                                              Title: Vice President
<PAGE>

                                     -113-

                                             TERRA METHANOL CORPORATION



                                             By /s/ William D. Conner
                                               ---------------------------------
                                              Title: Vice President



                                             BMC HOLDINGS, INC.



                                             By /s/ William D. Conner
                                               ---------------------------------
                                              Title: Vice President



                                             BEAUMONT HOLDINGS CORPORATION



                                             By /s/ William D. Conner
                                               ---------------------------------
                                              Title: Vice President



                                             TERRA INTERNATIONAL, INC.



                                             By /s/ William D. Conner
                                               ---------------------------------
                                              Title: Vice President



                                             TERRA NITROGEN, LIMITED PARTNERSHIP

                                             By: Terra Nitrogen Corporation,
                                                 its General Partner



                                                 By /s/George Valentine
                                                   -----------------------------
                                                  Title:  Vice President
<PAGE>

                                     -114-

                                        BEAUMONT METHANOL, LIMITED
                                        PARTNERSHIP

                                        By: TERRA METHANOL CORPORATION, as
                                            the General Partner


                                            By /s/ William D. Conner
                                              ----------------------------------
                                             Name:  William D. Conner
                                             Title:  Vice President



                                        BEAUMONT AMMONIA, INC.


                                        By /s/ George Valentine
                                          --------------------------------------
                                         Title: Vice President



                                        PORT NEAL CORPORATION


                                        By /s/ William D. Conner
                                          --------------------------------------
                                         Title: Vice President



                                        TERRA INTERNATIONAL (OKLAHOMA) INC.



                                        By /s/ William D. Conner
                                          --------------------------------------
                                         Title:  Treasurer



                                        TERRA (U.K.) HOLDINGS, INC.


                                        By /s/ George Valentine
                                          --------------------------------------
                                         Title: Vice President
<PAGE>

                                     -115-

                                        THE ADMINISTRATIVE AGENT
                                        ------------------------

                                        CITIBANK, N.A.



                                        By /s/ James N. Simpson
                                          --------------------------------------
                                         Title: Attorney-in-Fact


                                        THE LENDERS
                                        -----------

                                        CITIBANK, N.A.



                                        By /s/ James N. Simpson
                                          --------------------------------------
                                         Title: Attorney-in-Fact


                                        BANK OF AMERICA NATIONAL TRUST AND
                                         SAVINGS ASSOCIATION



                                        By /s/ Tom F. Scharfenberg
                                          --------------------------------------
                                         Title: Managing Director


                                        NATIONSBANK, N.A.



                                        By /s/ Tom F. Scharfenberg
                                          --------------------------------------
                                         Title: Managing Director


                                        THE BANK OF NOVA SCOTIA



                                        By /s/ F.C.H. Ashby
                                          --------------------------------------
                                         Title:  Senior Manager Loan Operations
<PAGE>

                                     -116-

                                        U.S. BANK NATIONAL ASSOCIATION



                                        By /s/ David A. Draxler
                                          --------------------------------------
                                         Title: Vice President


                                        THE CHASE MANHATTAN BANK



                                        By /s/ Gary L. Spevack
                                          --------------------------------------
                                         Title: Vice President


                                        THE FUJI BANK, LIMITED



                                        By /s/ Peter L. Chinnici
                                          --------------------------------------
                                         Title:  Senior Vice President &
                                                 Group Head


                                        CREDIT LYONNAIS CHICAGO BRANCH



                                        By /s/ Julie T. Kanak
                                          --------------------------------------
                                         Title: Vice President


                                        DRESDNER BANK AG, NEW YORK AND
                                         GRAND CAYMAN BRANCHES


                                        By /s/ Deborah Slusarczyk
                                          --------------------------------------
                                         Title: Vice President


                                        By /s/ Ken Hamilton
                                          --------------------------------------
                                         Title: Senior Vice President
<PAGE>

                                     -117-


                                        HARRIS TRUST & SAVINGS BANK



                                        By /s/ Robert A. Wolohan
                                          --------------------------------------
                                         Title: Vice President


                                        SUNTRUST BANK, ATLANTA



                                        By /s/ Michel Odermatt
                                          --------------------------------------
                                         Title: Vice President


                                        CREDIT AGRICOLE INDOSUEZ



                                        By /s/ Katherine L. Abbott
                                          --------------------------------------
                                         Title: First Vice President
                                                Managing Director


                                        By /s/ Bradley C. Peterson
                                          --------------------------------------
                                         Title:  Vice President, Manager


                                        BANQUE NATIONALE DE PARIS



                                        By /s/ Arnaud Collin du Bocage
                                          --------------------------------------
                                         Title:  Executive Vice President
                                                 and General Manager


                                        By Not Required
                                          --------------------------------------
                                         Title:
<PAGE>

                                     -118-


                                        THE BANK OF NEW YORK



                                        By /s/ John-Paul Marotta
                                          --------------------------------------
                                         Title: Vice President


                                        NORWEST BANK IOWA, NATIONAL
                                         ASSOCIATION



                                        By /s/ John Wagner
                                          --------------------------------------
                                         Title: Vice President


                                        COOPERATIEVE CENTRALE RAIFFEISEN-
                                         BOERENLEENBANK, B.A.,
                                         "RABOBANK NEDERLAND", NEW YORK
                                         BRANCH



                                        By /s/ Hans F. Breukhoven
                                          --------------------------------------
                                         Title: Vice President


                                        By /s/ Ian Reece
                                          --------------------------------------
                                         Title: Senior Credit Officer
<PAGE>

                                     -119-

                                        THE SUMITOMO BANK, LIMITED



                                        By /s/ John A. Kemper
                                          --------------------------------------
                                         Title: Senior Vice President



                                        THE FIRST NATIONAL BANK OF CHICAGO



                                        By /s/ Nathan L. Bloch
                                          --------------------------------------
                                         Title: First Vice President
<PAGE>

                                     -120-

                                        THE ISSUING BANKS
                                        -----------------

                                        CITIBANK, N.A.



                                        By /s/ James N. Simpson
                                          --------------------------------------
                                         Title: Attorney-in-Fact



                                        NATIONSBANK, N.A.



                                        By /s/ Tom F. Scharfenberg
                                          --------------------------------------
                                         Title: Managing Director


                                        THE SYNDICATION AGENT
                                        ---------------------

                                        NATIONSBANK, N.A.



                                        By /s/ Tom F. Scharfenberg
                                          --------------------------------------
                                         Title: Managing Director


                                        THE DOCUMENTATION AGENT
                                        -----------------------

                                        THE CHASE MANHATTAN BANK



                                        By /s/ Gary L. Spevack
                                          --------------------------------------
                                         Title: Vice President
<PAGE>

                                                                         ANNEX A

                Applicable Commitment Fee Rate; Applicable Margin
                -------------------------------------------------

          "Applicable Commitment Fee Rate" means 0.875% per annum; provided
           ------------------------------                          --------
that:

          (1)  The Applicable Commitment Fee Rate shall, from the Restatement
     Date until the Quarterly Date falling in September, 1999, be 0.625% per
     annum.

          (2)  Subject to clause (1) above, if for any Rolling Period ending on
     or after June 30, 1999 the Debt to Cash Flow Ratio for such Rolling Period
     shall be within any of the ranges specified in the schedule below, then,
     subject to the delivery to the Administrative Agent of a certificate of the
     Senior Financial Officer demonstrating the same prior to the first
     Quarterly Date (the "relevant Quarterly Date") occurring after the end of
                          -----------------------
     such Rolling Period, the "Applicable Commitment Fee Rate" shall be changed
     to the percentage per annum set forth opposite the reference to such range
     in such schedule during the period commencing on the relevant Quarterly
     Date until the next succeeding Quarterly Date thereafter:

             Range of Debt                        Applicable Commitment
          to Cash Flow Ratio                           Fee Rate
          ------------------                        --------------

          Greater than 8.00 to 1                        0.875%

          Less than or equal to
           8.00 to 1 and greater
           than 7.50 to 1                               0.750%

          Less than or equal to
           7.50 to 1 and greater
           than 7.00 to 1                               0.625%

          Less than or equal to
           7.00 to 1                                    0.500%

          "Applicable Margin" means, (a) with respect to all Base Rate Advances,
           -----------------
3.50% per annum and (b) with respect to all Eurodollar Rate Advances, 5.00% per
annum; provided that:
       --------

          (1)  The Applicable Margin shall, from the Restatement Date until the
     Quarterly Date falling in September, 1999, be (a) with respect to all Base
     Rate Advances, 2.50% per annum and (b) with respect to all Eurodollar Rate
     Advances, 4.00% per annum.

<PAGE>

                                      -2-

          (2)  Subject to clause (1) above, if for any Rolling Period ending on
     or after June 30, 1999 the Debt to Cash Flow Ratio for such Rolling Period
     shall be within any of the ranges specified in the schedule below, then,
     subject to the delivery to the Administrative Agent of a certificate of the
     Senior Financial Officer demonstrating the same prior to the first
     Quarterly Date (the "relevant Quarterly Date") occurring after the end of
                          -----------------------
     such Rolling Period, the "Applicable Margin" shall be changed to the
     percentage per annum for the respective Type of Advance set forth opposite
     the reference to such range in such schedule during the period commencing
     on the relevant Quarterly Date until the next succeeding Quarterly Date
     thereafter:


                                                 Applicable Margin (% p.a.)
                                                 --------------------------

            Range of Debt                     Base Rate         Eurodollar Rate
          to Cash Flow Ratio                  Advances              Advances
          ------------------                  --------          ---------------

          Greater than 8.00 to 1                3.50%                5.00%

          Less than or equal to
            8.00 to 1 and greater
            than 7.50 to 1                      3.00%                4.50%

          Less than or equal to
            7.50 to 1 and greater
            than 7.00 to 1                      2.50%                4.00%

          Less than or equal to
            7.00 to 1 and greater
            than 6.50 to 1                      2.25%                3.75%

          Less than or equal to
            6.50 to 1 and greater
            than 6.00 to 1                      2.00%                3.50%

          Less than or equal to
            6.00 to 1                           1.75%                3.25%

<PAGE>

                                                                   SCHEDULE 2.01

                                  Commitments
                                  -----------

<TABLE>
<CAPTION>
                                                                                Letter of Credit
Lender                                               Commitment                 Commitment
- ------                                               ----------                 ----------
<S>                                                  <C>                        <C>
Citibank, N.A.                                       $7,924,715.55              $20,000,000.00
Bank of America National Trust and                   $4,841,946.43              $            0
  Savings Association
The Bank of Nova Scotia                              $4,841,946.42              $            0
U.S. Bank National Association                       $4,630,178.57              $            0
NationsBank, N.A.                                    $4,551,630.47              $ 4,644,132.00
The Chase Manhattan Bank                             $4,551,630.46              $            0
The Fuji Bank, Limited                               $3,305,921.12              $            0
Credit Agricole Indosuez                             $3,186,141.27              $            0
Credit Lyonnais Chicago Branch                       $3,186,141.27              $            0
Dresdner Bank AG, New York and                       $3,186,141.27              $            0
  Grand Cayman Branches
Harris Trust & Savings Bank                          $3,186,141.27              $            0
Suntrust Bank, Atlanta                               $3,186,141.27              $            0
Banque Nationale de Paris                            $3,173,684.30              $            0
The Bank of New York                                 $2,275,815.14              $            0
Cooperatieve Centrale Raiffeisen-                    $1,820,652.26              $            0
  Boerenleenbank, B.A., "Rabobank
  Nederland", New York Branch
Norwest Bank Iowa, National Association              $1,820,652.26              $            0
The Sumitomo Bank, Limited                           $1,820,652.26              $            0
The First National Bank of Chicago                   $1,322,368.41              $            0
</TABLE>

<PAGE>

                                                                       EXHIBIT H

                  [Form of Liquid Asset Coverage Certificate]

                       LIQUID ASSET COVERAGE CERTIFICATE

             Quarterly accounting period ended ____________, ____


          Reference is made to the Amended and Restated Credit Agreement dated
as of June 25, 1999 (as modified and supplemented and in effect from time to
time, the "Credit Agreement"), between Terra Capital Inc. (the "Company"),
           ----------------                                     -------
certain Subsidiary Guarantors therein, the lenders party thereto and Citibank,
N.A, as Administrative Agent. Terms defined in the Credit Agreement are used
herein as defined therein.

          Pursuant to Section 5.03(b) of the Credit Agreement, the undersigned,
the Senior Financial Officer, hereby certifies that, to the best of [his/her]
knowledge, attached hereto as Annex 1 is a true and accurate calculation of the
Liquid Asset Coverage Amount as at the end of the quarterly accounting period
ended ____________, ____ determined in accordance with the requirements of the
Credit Agreement.

          All inventory covered by this Certificate has been produced in
compliance with all applicable laws, including, without limitation, the minimum
wage and overtime requirements of the Fair Labor Standards Act of 1938, as
amended.

          IN WITNESS WHEREOF, the undersigned has caused this certificate to be
duly executed as of the __________ day of ____________, ____.


                                         ____________________________
                                         Title:

<PAGE>

                                                                         Annex 1

                              TERRA CAPITAL INC.
                       Liquid Asset Coverage Certificate
                                (000's omitted)

================================================================================


Receivables -- beginning balance period ended

         ____________, ____                 ______

Receivables -- ending balance period ended

         ____________, ____                 ______

Minus:  ineligible Receivables at period end (determined without duplication):
- -----

Receivables not payable in Dollars
         or convertible currency                     ______

Total ineligible Receivables                         ______

Total Eligible Receivables                                      ______

================================================================================


Beginning period inventory balance

         ____________, ____                 ______

Ending period inventory balance

         ____________, ____                 ______

Minus:  ineligible inventory at period end (determined without duplication):
- -----

Inventory not located in U.S., Canada or U.K.        ______


Total Eligible Inventory                                        ______
<PAGE>

                                      -2-

================================================================================


Liquid Asset Coverage Amount:

Eligible Receivables                                    ______

Plus:  Eligible Inventory                               ______
- ----

Subtotal                                                ______

Liquid Asset Coverage Amount:                                        ______

================================================================================


Loan Balance Period begin

         ____________, ____                             ______

Loan Balance Period end

         ____________, ____                             ______

Letter of Credit Liabilities                            ______


Total outstandings                                                   ______

================================================================================


Availability (overadvance)                                           ______

================================================================================

<PAGE>

                                                                     EXHIBIT 4.7

                                                                [CONFORMED COPY]

================================================================================


                               CREDIT AGREEMENT

                         dated as of December 31, 1997
                                      and
                   Amended and Restated as of June 25, 1999

                                     among


                      TERRA INTERNATIONAL (CANADA) INC.,
                                  as Borrower


                              CERTAIN GUARANTORS


                                CERTAIN LENDERS



                          SALOMON SMITH BARNEY INC.,
                                  as Arranger


                                      and


                                CITIBANK, N.A.,
                            as Administrative Agent


===============================================================================

     [Exhibits D-1, D-2, D-3 and D-4 are copies of Opinions as Delivered]
<PAGE>

                               TABLE OF CONTENTS

          This Table of Contents is not part of the Agreement to which it is
attached but is inserted for convenience of reference only.

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
<S>                                                                        <C>
                                   ARTICLE I
                       DEFINITIONS AND ACCOUNTING TERMS

Section 1.01.  Certain Defined Terms.......................................   2
Section 1.02.  Computation of Time Periods.................................  30
Section 1.03.  Accounting Terms............................................  30

                                   ARTICLE II
                       AMOUNTS AND TERMS OF THE ADVANCES

Section 2.01.  The Advances................................................  31
Section 2.02.  Effecting the Assignments of the Advances...................  32
Section 2.03.  Repayment...................................................  33
Section 2.04.  Termination of the Commitments..............................  33
Section 2.05.  Prepayments.................................................  33
Section 2.06.  Interest....................................................  34
Section 2.07.  Conversion and Continuation of Advances.....................  35
Section 2.08.  Increased Costs, Illegality, Etc............................  36
Section 2.09.  Payments and Computations...................................  38
Section 2.10.  Taxes.......................................................  40
Section 2.11.  Sharing of Payments, Etc....................................  41
Section 2.12.  Criminal Rate of Interest...................................  42
Section 2.13.  Replacement of Lenders......................................  42

                                  ARTICLE III
                           CONDITIONS TO RESTATEMENT

Section 3.01.  Conditions Precedent........................................  43
Section 3.02.  Conditions Precedent to Section 2.01(a) Assignments.........  47
Section 3.03.  Determinations Under Section 3.01...........................  48

                                  ARTICLE IV
                        REPRESENTATIONS AND WARRANTIES

Section 4.01.  Representations and Warranties of the Borrower..............  48
Section 4.02.  Representations and Warranties of each Lender...............  56

                                   ARTICLE V
                              COVENANTS OF TERRA

Section 5.01.  Affirmative Covenants.......................................  56
</TABLE>

                                      (i)
<PAGE>

<TABLE>
<S>                                                                         <C>
Section 5.02.  Negative Covenants..........................................  63
Section 5.03.  Reporting Requirements......................................  77

                                  ARTICLE VI
                               EVENTS OF DEFAULT

Section 6.01.  Events of Default...........................................  82

                                  ARTICLE VII
                           THE ADMINISTRATIVE AGENT

Section 7.01.  Authorization and Action....................................  85
Section 7.02.  Administrative Agent's Reliance, Etc........................  86
Section 7.05.  Indemnification.............................................  87
Section 7.06.  Collateral Duties...........................................  87
Section 7.07.  Successor Administrative Agent..............................  88

                                 ARTICLE VIII
                                 THE GUARANTEE

Section 8.01.  The Guarantee...............................................  89
Section 8.02.  Obligations Unconditional...................................  89
Section 8.03.  Reinstatement...............................................  90
Section 8.04.  Subrogation.................................................  90
Section 8.05.  Remedies....................................................  91
Section 8.06.  Instrument for the Payment of Money.........................  91
Section 8.07.  Continuing Guarantee........................................  91
Section 8.08.  Rights of Contribution......................................  91
Section 8.09.  General Limitation on Guarantee Obligations.................  92

                                  ARTICLE IX
                                 MISCELLANEOUS

Section 9.01.  Amendments, Consents, Etc...................................  92
Section 9.02.  Notices, Etc................................................  94
Section 9.03.  No Waiver; Remedies.........................................  94
Section 9.04.  Costs, Expenses and Indemnification.........................  95
Section 9.05.  Right of Setoff.............................................  96
Section 9.06.  Jurisdiction, Service of Process and Venue..................  97
Section 9.07.  Assignments and Participations..............................  98
Section 9.08.  Execution in Counterparts................................... 101
Section 9.09.  Confidentiality............................................. 101
Section 9.10.  WAIVER OF JURY TRIAL........................................ 101
Section 9.11.  Survival.................................................... 101
Section 9.12.  Captions.................................................... 102
Section 9.13.  Successors and Assigns...................................... 102
</TABLE>

                                     (ii)
<PAGE>

<TABLE>
<S>                                                                         <C>
Section 9.14.  No Immunity................................................. 102
Section 9.15.  Judgment Currency........................................... 102
</TABLE>

ANNEX A                Applicable Margin

SCHEDULE 2.01          List of Outstanding Advances
SCHEDULE 4.01(b)       Subsidiaries
SCHEDULE 4.01(c)       List of Conflicts with Credit Instruments
SCHEDULE 4.01(d)       List of Required Authorizations, Consents
SCHEDULE 4.01(j)       Plans and Multiemployer Plans
SCHEDULE 4.01(q)       Environmental Compliance Schedule
SCHEDULE 4.01(u)       Open Tax Years
SCHEDULE 4.01(y)       Existing Debt
SCHEDULE 5.02(a)(iii)  Existing Liens
SCHEDULE 5.02(c)       Existing Hedge Agreements
SCHEDULE 5.02(f)       Investments

                                   EXHIBITS

EXHIBIT A              Form of Note
EXHIBIT B-1            Form of Amended and Restated Holdings Pledge Agreement
EXHIBIT B-2            Form of Amended and Restated Terra Capital Pledge and
                       Security Agreement
EXHIBIT B-3            Form of Amended and Restated Subsidiary Pledge and
                       Security Agreement
EXHIBIT B-4            Form of Amended and Restated TNLP Pledge and Security
                       Agreement
EXHIBIT B-5            Terra Canada Security Agreement
EXHIBIT B-6            Terra Canada Mortgage
EXHIBIT B-7            Form of Mortgage
EXHIBIT C              Form of Restatement Date Notice
EXHIBIT D-1            Form of Opinion of Special U.S. Counsel to the Obligors
EXHIBIT D-2            Form of Opinion of Special Canadian Counsel to Terra
                       Canada
EXHIBIT D-3            Form of Opinion of Special New York Counsel to Citibank
EXHIBIT D-4            Form of Opinion of Special Canadian Counsel to Citibank
EXHIBIT E              Form of Confirmation of Loan Purchase Agreement
EXHIBIT E-1            Loan Purchase Agreement
EXHIBIT F              Form of Assignment and Acceptance
EXHIBIT G              Intercreditor Agreement
EXHIBIT H              Form of New York Process Agent Acceptance

                                     (iii)
<PAGE>

                               CREDIT AGREEMENT

          CREDIT AGREEMENT dated as of December 31, 1997 and amended and
restated as of June 25, 1999 among:

     (1)  TERRA INTERNATIONAL (CANADA) INC., an Ontario corporation (the

          "Borrower");
          ---------

     (2)  each of the corporations and limited partnerships listed on the
          signature pages hereof under the caption "GUARANTORS";

     (3)  each of the lenders (the "Initial Lenders") listed on the signature
                                    ---------------
          pages hereof; and

     (4)  CITIBANK, N.A., as agent (together with its successor in such capacity
          appointed pursuant to Article VII, the "Administrative Agent") for the
                                                  --------------------
          Lenders hereunder.


                            PRELIMINARY STATEMENTS:

          Capitalized terms used in these Preliminary Statements and not
otherwise defined have the meanings assigned to them in Section 1.01.

          (a)  The Borrower, the Guarantors, the Initial Lenders (or certain of
their Affiliates) and the Administrative Agent are parties to a Credit Agreement
dated as of December 31, 1997 and amended and restated as of March 31, 1998 (as
in effect on the Restatement Date, the "Existing Credit Agreement") pursuant to
                                        -------------------------
which such Lenders made term loans to the Borrower on December 31, 1997 in an
aggregate principal amount equal to $125,000,000.

          (b)  Terra has entered into an Asset Sale and Purchase Agreement dated
May 3, 1999 (as from time to time amended, the "Distribution Business Sale
                                                --------------------------
Agreement") between Terra and Cenex/Land O'Lakes Agronomy Company, a Minnesota
- ---------
corporation ("Cenex"), pursuant to which Terra has agreed to sell all of its
              -----
right, title, and interest in and to the properties, assets, and rights of every
kind relating to the Distribution Business.

          (c)  The Borrower has requested that the Initial Lenders consent to
the sale by Terra of the Distribution Business as contemplated in the
Distribution Business Sale Agreement, all on the terms and conditions set forth
herein.

          (d)  The Borrower has also requested that the Initial Lenders amend
the Existing Credit Agreement, among other things to (i) reflect that portions
of the "Advances" outstanding under and as defined in the Existing Credit
Agreement are being assigned by the Lenders thereunder to the Initial Lenders
pursuant hereto, (ii) to modify certain covenants thereof and (ii) to make
certain other changes to the Existing Credit Agreement and the other Loan
Documents, all on the terms and conditions set forth herein, it being the
intention of the parties

<PAGE>

                                      -2-



hereto that (i) the advances outstanding under the Existing Credit Agreement on
the Restatement Date shall continue and remain outstanding and not be repaid on
the Restatement Date and (ii) the amendment and restatement evidenced hereby
shall not establish a new debt obligation in substitution for, or a novation of,
such outstanding advances.

          NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements contained herein, the parties hereto hereby agree that
the Existing Credit Agreement shall (subject to the satisfaction of the
conditions precedent specified in Article III) be amended and restated to read
as set forth herein.

                                   ARTICLE I

                       DEFINITIONS AND ACCOUNTING TERMS

          Section 1.01. Certain Defined Terms. As used in this Agreement, the
                        ---------------------
following terms shall have the following meanings (such meanings to be equally
applicable to both the singular and plural forms of the terms defined):

          "Acquired Debt" means, without duplication:
           -------------

               (a)  Debt of Subsidiaries of Terra acquired by Terra or any of
          its Subsidiaries after the Restatement Date;

               (b)  Debt assumed by Terra (whether by operation of law or
          contract or otherwise) in connection with mergers by Terra after the
          Restatement Date consummated in accordance with Section
          5.02(d)(ii)(y); and

               (c)  assumptions or Guarantees of other Acquired Debt by Terra or
          one of its Subsidiaries.

          "Administrative Agent" has the meaning specified in the recital of
           --------------------
     parties to this Agreement.

          "Administrative Agent's Account" means the account of the
           ------------------------------
     Administrative Agent maintained by the Administrative Agent at its office
     at 2 Penns Way, Suite 200, New Castle, Delaware, 19720, Account No. 368-
     52248, Attention:  Jacqueline Roman (or her successor), or such other
     account maintained by the Administrative Agent as may be designated by the
     Administrative Agent in a written notice to the Lenders and the Borrower.

          "Administrative Questionnaire" means an Administrative Questionnaire
           ----------------------------
     in a form supplied by the Administrative Agent.

          "Advances" has the meaning assigned to such term in Section 2.01.
           --------

<PAGE>

                                      -3-

          "Affiliate" means, as to any Person, any other Person that, directly
           ---------
     or indirectly, controls, is controlled by or is under common control with
     such Person or is a director or officer of such Person.  For purposes of
     this definition, the term "control" (including the terms "controlling",
                                -------                        -----------
     "controlled by" and "under common control with") of a Person means the
     --------------       -------------------------
     possession, direct or indirect, of the power to vote 10% or more of the
     voting stock of such Person or to direct or cause the direction of the
     management and policies of such Person, whether through the ownership of
     voting stock, by contract or otherwise.

          "AMCI Senior Note Indenture" means the Indenture dated as of October
           --------------------------
     15, 1993 between Terra and Society National Bank, as Trustee, providing for
     the issuance of the AMCI Senior Notes, as from time to time amended.

          "AMCI Senior Notes" means the 10-3/4% senior notes of Terra due 2003
           -----------------
     issued pursuant to the AMCI Senior Note Indenture.

          "Ammonia Loop" means the ammonia loop facility to be constructed as an
           ------------
     extension of BMLP's methanol plant pursuant to the Engineering, Procurement
     and Construction Agreement dated as of October 20, 1997 between TNC and
     Foster Wheeler USA Corporation, as from time to time amended.

          "Ammonium Nitrate Hedging Agreement" means an agreement between the
           ----------------------------------
     Borrower and ICI pursuant to which the Borrower agrees to pay certain
     amounts to ICI in the event that the annual average price of ammonium
     nitrate exceeds (Pounds)100 per tonne, as from time to time amended
     (without prejudice to Section 5.02(l)).

          "Applicable Lending Office" means, with respect to each Lender, such
           -------------------------
     Lender's Domestic Lending Office in the case of a Base Rate Advance and
     such Lender's Eurodollar Lending Office in the case of a Eurodollar Rate
     Advance.

          "Applicable Margin" has the meaning specified in Annex A.
           -----------------

          "Assignment and Acceptance" means an assignment and acceptance entered
           -------------------------
     into by a Lender and an Eligible Assignee, and accepted by the
     Administrative Agent, in accordance with Section 9.07 and in substantially
     the form of Exhibit F.

          "BAI" means Beaumont Ammonia, Inc., a Delaware corporation and
           ---
     Subsidiary of Terra U.K. Holdings.

          "Base Rate" means a fluctuating interest rate per annum in effect from
           ---------
     time to time, which rate per annum shall at all times be equal to the
     highest of:

               (a)  the rate of interest announced publicly by Citibank in New
          York, New York, from time to time, as Citibank's base rate;
<PAGE>

                                      -4-

               (b)  0.50% per annum above the Federal Funds Rate; and

               (c)  the sum (adjusted to the nearest 0.25% or, if there is no
          nearest 0.25%, to the next higher 0.25%) of (i) 0.50% per annum plus
          (ii) the rate obtained by dividing (x) the latest three-week moving
          average of secondary market morning offering rates in the United
          States for three-month certificates of deposit of major United States
          money center banks, such three-week moving average (adjusted to the
          bases of a year of 360 days) being determined weekly on each Monday
          (or, if such date is not a Business Day, on the next succeeding
          Business Day) for the three-week period ending on the previous Friday
          by Citibank on the basis of such rates reported by certificate of
          deposit dealers to and published by the Federal Reserve Bank of New
          York or, if such publication shall be suspended or terminated, on the
          basis of quotations for such rates received by Citibank from three New
          York certificate of deposit dealers of recognized standing selected by
          Citibank by (y) a percentage equal to 100% minus the average of the
          daily percentages specified during such three-week period by the Board
          of Governors of the Federal Reserve System (or any successor) for
          determining the maximum reserve requirement (including, but not
          limited to, any emergency, supplemental or other marginal reserve
          requirement) for Citibank with respect to liabilities consisting of or
          including (among other liabilities) three-month U.S. Dollar non-
          personal time deposits in the United States plus (iii) the average
          during such three-week period of the annual assessment rates estimated
          by Citibank for determining the then current annual assessment rate
          payable by Citibank to the Federal Deposit Insurance Corporation (or
          any successor) for insuring U.S. Dollar deposits of Citibank in the
          United States.

     Each change in any interest rate provided for herein based upon the Base
     Rate resulting from a change in the Base Rate shall take effect at the time
     of such change in the Base Rate.

          "Base Rate Advance" means an Advance that bears interest as provided
           -----------------
     in Section 2.06(a)(i).

          "Basic Documents" means the Loan Documents and the Intercreditor
           ---------------
     Agreement.

          "Beaumont Holdings" means Beaumont Holdings Corporation, a Delaware
           -----------------
     corporation and wholly owned Subsidiary of BMCH.

          "BMCH" means BMC Holdings, Inc., a Delaware corporation.
           ----

          "BMLP" means Beaumont Methanol, Limited Partnership, a Delaware
           ----
     limited partnership.
<PAGE>

                                      -5-

          "BMLP Class A Limited Partner" means the holder from time to time of
           ----------------------------
     the BMLP Class A Limited Partnership Interest.

          "BMLP Class A Limited Partnership Interest" means the Class A limited
           -----------------------------------------
     partnership interest in BMLP.

          "BMLP Mortgage" means a Deed of Trust, Assignment of Rents, Security
           -------------
     Agreement and Fixture Filing in substantially the form attached hereto as
     Exhibit B-7 among BMLP, BAI and the Collateral Agent, as amended from time
     to time.

          "BMLP Partnership Agreement" means the Second Amended and Restated
           --------------------------
     Agreement of Limited Partnership of BMLP dated as of March 31, 1998 among
     TMC, as general partner, BMCH, as Class B Limited Partner, and Nova
     Products LLC, as BMLP Class A Limited Partner, or their successors and
     assigns, as amended pursuant to the documentation delivered under Section
     3.01(q) and as amended from time to time (without prejudice to Section
     5.02(j)).

          "BMLP Support and Option Agreement" means the Amended and Restated
           ---------------------------------
     Support and Option Agreement dated as of March 31, 1998 among the Company,
     the BMLP Class A Limited Partner and the beneficial owners of equity
     interests in the BMLP Class A Limited Partner, as from time to time
     amended.

          "Borrower" has the meaning specified in the recital of parties to this
           --------
     Agreement.

          "Business Day" means a day on which banks are not required or
           ------------
     authorized to close in New York City and Toronto, Ontario, Canada and, if
     such Business Day relates to a Eurodollar Rate Advance, on which dealings
     are carried on in the London interbank market.

          "Canada" means the federal government of Canada and any agency,
           ------
     ministry or board thereof.

          "Canadian Employee Benefit Plan" means any employee benefit, pension,
           ------------------------------
     retirement or other equivalent or analogous plan or program established or
     maintained by the Borrower or any of its Canadian Subsidiaries.

          "Capital Expenditures" means, for any period with respect to any
           --------------------
     Person, the sum of all expenditures during such period (whether paid in
     cash or accrued as liabilities during such period) that, in conformity with
     GAAP, are required to be included in or reflected on the balance sheet of
     such Person in respect of equipment, fixed assets, real property or
     improvements, or for replacements or substitutions therefor or additions
     thereto, plus (without duplication) the amount of expenditures deemed to be
              ----
     made in connection with equipment that is purchased simultaneously with the
     trade-in of existing equipment owned by such Person to the extent the gross
     amount of the purchase price of
<PAGE>

                                      -6-

     such purchased equipment exceeds the fair market value (as determined in
     good faith by such Person) of the equipment then being traded in, but
     excluding expenditures made in connection with the replacement or
     restoration of assets to the extent such replacement or restoration is
     financed from insurance proceeds paid on account of loss or damage to the
     assets so replaced or restored.

          "Capital Lease Obligations" means, for any Person, all obligations of
           -------------------------
     such Person to pay rent or other amounts under a lease of (or other
     agreement conveying the right to use) property to the extent such
     obligations are required to be classified and accounted for as a capital
     lease on a balance sheet of such Person under GAAP, and, for purposes of
     this Agreement, the amount of such obligations shall be the capitalized
     amount thereof, determined in accordance with GAAP.

          "Cash Interest Expense" means, for any Person for any period (without
           ---------------------
     duplication), interest expense net of interest income, whether paid or
     accrued (including the interest component of Capital Lease Obligations), on
     all Debt of such Person for such period, including, without limitation, (a)
     interest expense in respect of the Advances, (b) commissions, discounts and
     other fees and charges payable in connection with letters of credit and (c)
     the net payment, if any, payable in connection with any Hedge Agreement;
     excluding, in each case, interest not payable in cash (including, without
     ---------
     limitation, amortization of original issue discount and the interest
     portion of any deferred payment obligation); all as determined in
     accordance with GAAP for such period.

          "Casualty Event" means, with respect to any property of any Person,
           --------------
     any loss of or damage to, or any condemnation or other taking of, such
     property for which such Person or any of its Subsidiaries receives
     insurance proceeds, or proceeds of a condemnation award or other
     compensation.

          "CERCLA" means the Comprehensive Environmental Response, Compensation
           ------
     and Liability Act of 1980, as amended.

          "Citibank" means Citibank, N.A., a national banking association.
           --------

          "Closing Date" means December 31, 1997.
           ------------

          "Collateral" means all "Collateral" referred to in the Security
           ----------
     Documents and all other property that is subject to any Lien created by any
     Terra Canada Security Document in favor of the Administrative Agent or any
     Lien created by any Terra Capital Security Document in favor of the
     Collateral  Agent.

          "Collateral Agent" means Citibank, in its capacity as Collateral Agent
           ----------------
     for the Secured Parties under and as defined in the Terra Capital Security
     Documents and the Intercreditor Agreement, together with its successors in
     such capacity.
<PAGE>

                                      -7-

          "Company" means Terra Capital, Inc., a Delaware corporation and the
           -------
     indirect parent of the Borrower.

          "Confidential Information" means information identified as such that
           ------------------------
     Terra or any of its Subsidiaries furnishes to the Administrative Agent or
     any Lender, but does not include any such information once such information
     has become generally available to the public or once such information has
     become available to the Administrative Agent or any Lender from a source
     other than Terra and its Subsidiaries (unless, in either case, such
     information becomes so available as a result of the breach by the
     Administrative Agent or a Lender of its duty of confidentiality set forth
     in Section 9.09).

          "Consolidated" refers to the consolidation of accounts in accordance
           ------------
     with GAAP.

          "Consolidated Group" means, collectively, Terra and its Consolidated
           ------------------
     Subsidiaries, and a "member" of the Consolidated Group means Terra or any
     such Subsidiary.

          "Continuation", "Continue" and "Continued" each refers to a
           ------------    --------       ---------
     continuation of Eurodollar Rate Advances from one Interest Period to the
     next Interest Period pursuant to Section 2.07.

          "Conversion", "Convert" and "Converted" each refers to a conversion of
           ----------    -------       ---------
     Advances of one Type into Advances of the other Type pursuant to Section
     2.07 or 2.08.

          "Cumulative Adjusted Net Income" means, for any period, the sum, for
           ------------------------------
     each complete fiscal year of Terra (beginning with the fiscal year ending
     December 31, 1995) during such period, of the Adjusted Net Income Amounts
     for all such fiscal years.  For purposes of this definition, "Adjusted Net
                                                                   ------------
     Income Amount" means, for any fiscal year of Terra, the greater of (x) 33-
     -------------
     1/3% of the net income of Terra and its Subsidiaries on a Consolidated
     basis during such fiscal year and (y) $20,000,000.

          "Debt" of any Person means (without duplication):  (a) all
           ----
     indebtedness of such Person for borrowed money, (b) all Obligations of such
     Person for the deferred purchase price of property or services (other than
     any trade payable having a tenor of not more than 365 days, or any like
     item arising from the purchase of equipment or services having a tenor of
     not more than 90 days, in each case incurred in the ordinary course of
     business and on normal business terms and in each case not overdue by more
     than 30 days, and other than any Obligations in respect of letters of
     credit supporting any such trade payable or like item), (c) all Obligations
     of such Person evidenced by notes, bonds, debentures or other similar
     instruments, (d) all indebtedness created or arising under any conditional
     sale or other title retention agreement with respect to property acquired
     by such Person (even though the rights and remedies of the seller or lender
     under such agreement in the event of default are limited to repossession or
     sale of such property), (e) all Capital Lease Obligations and Major
     Operating Lease Obligations of such Person,
<PAGE>

                                      -8-

     (f) all Obligations, contingent or otherwise, of such Person under
     acceptance, letter of credit or similar facilities (other than Obligations
     in respect of letters of credit referred to in clause (b) of this
     definition), (g) all Obligations of such Person to purchase, redeem,
     retire, defease or otherwise make any payment in respect of any Redeemable
     capital stock, which Obligations shall be valued at the greater of its
     voluntary or involuntary liquidation preference plus accrued and unpaid
     dividends, (h) all Obligations of such Person in respect of Hedge
     Agreements, (i) all Debt of others referred to in clauses (a) through (h)
     above guaranteed directly or indirectly in any manner by such Person, or in
     effect guaranteed directly or indirectly by such Person through an
     agreement (i) to pay or purchase such Debt or to advance or supply funds
     for the payment or purchase of such Debt, (ii) to purchase, sell or lease
     (as lessee or lessor) property, or to purchase or sell services, primarily
     for the purpose of enabling the debtor to make payment of such Debt or to
     assure the holder of such Debt against loss, (iii) to supply funds to or in
     any other manner invest in the debtor (including any agreement to pay for
     property or services irrespective of whether such property is received or
     such services are rendered) or (iv) otherwise to assure a creditor against
     loss, and (j) all Debt referred to in clauses (a) through (i) above secured
     by (or for which the holder of such Debt has an existing right, contingent
     or otherwise, to be secured by) any Lien on property (including, without
     limitation, accounts and contract rights) owned by such Person, even though
     such Person has not assumed or become liable for the payment of such Debt.

          "Debt to Cash Flow Ratio" means, for any period, the ratio of:
           -----------------------

               (1)  Funded Debt of Terra and its Subsidiaries on a Consolidated
          basis as of the last day of such period to

               (2)  (x) EBITDA of Terra and its Subsidiaries on a Consolidated
          basis for such period multiplied by (y) the Ramp Up Period Multiplier
          for such period.

          In addition, solely for purposes of Section 5.04, in determining the
     Debt to Cash Flow Ratio on any date or for any period when any Special
     Refinancing Debt is outstanding, Funded Debt and EBITDA shall be determined
     as follows during the period from the date on which such Special
     Refinancing Debt is incurred until the Refinanceable Debt is refinanced or
     replaced in accordance with Section 5.02(b)(1)(xix)(I):

               (1)  the Funded Debt component shall be determined excluding
          either such Special Refinancing Debt or the related Refinanceable
          Debt, whichever is lower in aggregate outstanding principal amount
          (the "Excluded Debt"); and
                -------------

               (2)  the EBITDA component shall be determined excluding interest
          expense on such Excluded Debt.

          "Default" means any event that would constitute an Event of Default
           -------
     but for the requirement that notice be given or time elapse or both.
<PAGE>

                                      -9-

          "Disposition" means any sale, assignment, transfer or other
           -----------
     disposition of any property (whether now owned or hereafter acquired) by
     Terra or any of its Subsidiaries, but excluding any sale, assignment,
     transfer or other disposition of any property (i) sold or disposed of in
     the ordinary course of business and on ordinary business terms, or (ii) by
     any Obligor or a wholly owned Subsidiary of an Obligor to another Obligor
     or to a wholly owned Subsidiary of an Obligor, or (iii) that consists of
     outmoded or obsolete items, provided that the aggregate value of all such
                                 --------
     excluded outmoded or obsolete items with a value of $1,000,000 or more each
     shall not exceed $10,000,000, or (iv) that consists of items no longer
     necessary in the business of Terra or any such Subsidiary, provided that
                                                                --------
     the aggregate value of all such unnecessary items in any fiscal year of
     Terra shall not exceed $250,000.

          "Distribution Business" means the "Business" as defined in the
           ---------------------
     Distribution Business Sale Agreement.

          "Distribution Business Sale Agreement" has the meaning specified in
           ------------------------------------
     the Preliminary Statements to this Agreement.

          "Dividend Payments" means dividends (in cash, property or obligations)
           -----------------
     on, or other payments or distributions on account of, or the setting apart
     of money for a sinking or other analogous fund for, or the purchase,
     redemption, retirement or other acquisition of, any shares of any class of
     stock of the Company or of any warrants, options or other rights to acquire
     the same (or to make any payment to any Person, such as "phantom stock"
     payments, where the amount thereof is calculated with reference to the fair
     market or equity value of Terra, the Company or any of their Subsidiaries,
     other than any such payment made in the ordinary course of business of such
     Person in connection with an executive compensation plan approved by the
     Board of Directors of such Person), but excluding dividends payable solely
     in shares of common stock of the Company.

          "Domestic Lending Office" means, with respect to any Lender, the
           -----------------------
     office of such Lender specified as its "Domestic Lending Office" in its
     Administrative Questionnaire, or such other office of such Lender as such
     Lender may from time to time specify to the Administrative Agent.

          "EBITDA" of any Person for any period means the following, determined
           ------
     in accordance with GAAP:  net income (or net loss) plus the sum of (a)
                                                        ----
     interest expense, (b) income tax expense and (c) depreciation expense,
     amortization expense and other non-cash charges deducted in arriving at
     such net income (or loss).

          "Eligible Assignee" means (a) any other Lender or any affiliate of any
           -----------------
     Lender; (b) a commercial bank organized under the laws of the United
     States, or any State thereof, and having total assets in excess of
     $1,000,000,000; (c) a savings and loan association or savings bank
     organized under the laws of the United States, or any State
<PAGE>

                                      -10-

     thereof, and having a net worth in excess of $100,000,000; (d) a commercial
     bank organized under the laws of any other country that is a member of the
     OECD or has concluded special lending arrangements with the International
     Monetary Fund associated with its General Arrangements to Borrow, or a
     political subdivision of any such country, and having total assets in
     excess of $1,000,000,000, so long as such bank is acting through a branch
     or agency located in the country in which it is organized or another
     country that is described in this clause (d); (e) the central bank of any
     country that is a member of the OECD; (f) a finance company, insurance
     company or other financial institution or fund (whether a corporation,
     partnership, trust or other entity) that is engaged in making, purchasing
     or otherwise investing in commercial loans in the ordinary course of its
     business and having total assets in excess of $100,000,000; and (g) any
     other Person (other than an Affiliate of the Company) approved by the
     Administrative Agent and the Company, such approval of the Company not to
     be unreasonably withheld or delayed.

          "Environmental Action" means any administrative, regulatory or
           --------------------
     judicial suit, demand, demand letter, claim, notice of non-compliance or
     violation, consent order or consent agreement relating in any way to any
     violation of or liability under any Environmental Law or any Environmental
     Permit, including without limitation (a) any claim by any governmental or
     regulatory authority for enforcement, cleanup, removal, response, remedial
     or other actions or damages pursuant to any Environmental Law, (b) any
     claim by any third party seeking damages, contribution, indemnification,
     cost recovery, compensation or injunctive relief resulting from Hazardous
     Materials or arising from alleged injury or threat of injury to the
     environment and (c) any notice by any governmental or regulatory authority
     alleging that Terra or any of its Subsidiaries is or may be responsible
     for, or is a potentially responsible party with respect to, any cleanup,
     removal, response, remedial or other actions or damages pursuant to any
     Environmental Law.

          "Environmental Law" means any federal, state, provincial or local
           -----------------
     governmental law, rule, regulation, order, writ, judgment, injunction or
     decree relating to pollution or protection of the environment or the
     treatment, storage, disposal, release, threatened release or handling of
     Hazardous Materials, including, without limitation, CERCLA, the Resource
     Conservation and Recovery Act, the Hazardous Materials Transportation Act,
     the Clean Water Act, the Toxic Substances Control Act, the Clean Air Act,
     the Safe Drinking Water Act, the Atomic Energy Act and the Federal
     Insecticide, Fungicide and Rodenticide Act, in each case, as amended from
     time to time.

          "Environmental Permit" means any permit, approval, identification
           --------------------
     number, license or other authorization required under any Environmental
     Law.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
           -----
     amended from time to time, and the regulations promulgated and rulings
     issued thereunder.
<PAGE>

                                      -11-

          "ERISA Affiliate" of any Person means any other Person that for
           ---------------
     purposes of Title IV of ERISA is a member of such Person's controlled
     group, or under common control with such Person, within the meaning of
     Sections 414(b), (c), (m) and (o) of the Internal Revenue Code.

          "ERISA Event" with respect to any Person means (a) the occurrence of a
           -----------
     reportable event, within the meaning of Section 4043 of ERISA, with respect
     to any Plan of such Person or any of its ERISA Affiliates unless the 30-day
     notice requirement with respect to such event has been waived pursuant to
     regulations under Section 4043 of ERISA and excluding a reportable event
     under Section 4043(c)(7) of ERISA; (b) the provision by the administrator
     of any Plan of such Person or any of its ERISA Affiliates of a notice of
     intent to terminate such Plan, pursuant to Section 4041(c) of ERISA as a
     distress termination; (c) the cessation of operations at a facility of such
     Person or any of its ERISA Affiliates in the circumstances described in
     Section 4062(e) of ERISA; (d) the withdrawal by such Person or any of its
     ERISA Affiliates from a Multiple Employer Plan during a plan year for which
     it was a substantial employer, as defined in Section 4001(a)(2) of ERISA;
     (e) the satisfaction of the conditions set forth in Sections 302(f)(1)(A)
     and (B) of ERISA to the creation of a lien upon property or rights to
     property of such Person or any ERISA Affiliate for failure to make a
     required payment to a Plan; (f) the adoption of an amendment to a Plan of
     such Person or any of its ERISA Affiliates requiring the provision of
     security to such Plan, pursuant to Section 307 of ERISA; or (g) the
     institution by the PBGC of proceedings to terminate a Plan of such Person
     or any of its ERISA Affiliates, pursuant to Section 4042 of ERISA, or the
     occurrence of any event or condition described in Section 4042 of ERISA
     that constitutes grounds for the termination of, or the appointment of a
     trustee to administer, such Plan.

          "Eurocurrency Liabilities" has the meaning specified in Regulation D
           ------------------------
     of the Board of Governors of the Federal Reserve System, as in effect from
     time to time.

          "Eurodollar Lending Office" means, with respect to any Lender, the
           -------------------------
     office of such Lender specified as its "Eurodollar Lending Office" in its
     Administrative Questionnaire (or, if no such office is specified, its
     Domestic Lending Office), or such other office of such Lender as such
     Lender may from time to time specify to the Administrative Agent.

          "Eurodollar Rate" means, for any Interest Period for each Eurodollar
           ---------------
     Rate Advance, an interest rate per annum equal to the rate per annum
     obtained by dividing (a) the average (rounded upward to the nearest whole
     multiple of 1/16 of 1% per annum, if such average is not such a multiple)
     of the rates per annum at which deposits in U.S. dollars are offered by the
     principal office of each of the Reference Banks in London, England to prime
     banks in the London interbank market at approximately 5:00 P.M. (London
     time) two Business Days before the first day of such Interest Period in an
     amount substantially equal to such Reference Bank's Eurodollar Rate Advance
     for such Interest Period (determined without giving effect to any
     assignments or participations by
<PAGE>

                                      -12-

     such Reference Bank) and for a period equal to such Interest Period by (b)
     a percentage equal to 100% minus the Eurodollar Rate Reserve Percentage for
                                -----
     such Interest Period. The Eurodollar Rate for each Interest Period for each
     Eurodollar Rate Advance shall be determined by the Administrative Agent on
     the basis of applicable rates furnished to and received by the
     Administrative Agent from the Reference Banks two Business Days before the
     first day of such Interest Period, subject, however, to the provisions of
                                        -------  -------
     Section 2.08.

          "Eurodollar Rate Advance" means an Advance that bears interest as
           -----------------------
     provided in Section 2.06(a)(ii).

          "Eurodollar Rate Reserve Percentage" for any Interest Period for each
           ----------------------------------
     Eurodollar Rate Advance means the reserve percentage (if any) applicable
     two Business Days before the first day of such Interest Period under
     regulations issued from time to time by the Board of Governors of the
     Federal Reserve System (or any successor) for determining the maximum
     reserve requirement (including, without limitation, any emergency,
     supplemental or other marginal reserve requirement) for a member bank of
     the Federal Reserve System in New York City with deposits exceeding
     $1,000,000,000 with respect to liabilities or assets consisting of or
     including Eurocurrency Liabilities (or with respect to any other category
     of liabilities that includes deposits by reference to which the interest
     rate on Eurodollar Rate Advances is determined) having a term equal to such
     Interest Period.

          "Events of Default" has the meaning specified in Section 6.01.
           -----------------

          "Excluded Period" means, with respect to any additional amount payable
           ---------------
     under Section 2.08, the period ending 120 days prior to the applicable
     Lender's delivery of a certificate referenced in Section 2.08(a) or
     2.08(b), as applicable, with respect to such additional amount.

          "Excluded Transactions" means, collectively:
           ---------------------

               (1)  the purchase, redemption or other acquisition of Senior
          Preference Units pursuant to the SPU Redemption;

               (2)  capital contributions to Subsidiaries of Terra;

               (3)  the purchase of the BMLP Class A Limited Partnership
          Interest as required under Section 3.01(q); and

               (4)  Investments permitted under Sections 5.02(f)(vi) and (xi).

          "Existing Advances" means the "Advances" under, and as defined in, the
           -----------------
     Existing Credit Agreement outstanding as of the Restatement Date.
<PAGE>

                                      -13-

          "Existing Credit Agreement" has the meaning assigned to such term in
           -------------------------
     the Preliminary Statements.

          "Existing Lender" means each Initial Lender that is a "Lender" party
           ---------------
     to the Existing Credit Agreement as of the Restatement Date.

          "Existing Notes" means the "Notes" under, and as defined in, the
           --------------
     Existing Credit Agreement outstanding as of the Restatement Date.

          "Federal Funds Rate" means, for any period, a fluctuating interest
           ------------------
     rate per annum equal for each day during such period to the weighted
     average of the rates on overnight Federal funds transactions with members
     of the Federal Reserve System arranged by Federal funds brokers, as
     published for such day (or, if such day is not a Business Day, for the next
     preceding Business Day) by the Federal Reserve Bank of New York, or, if
     such rate is not so published for any day that is a Business Day, the
     average of the quotations for such day for such transactions received by
     the Administrative Agent from three Federal funds brokers of recognized
     standing selected by it.

          "Foreign Subsidiary" means a Subsidiary not organized under the laws
           ------------------
     of the United States of America or any State thereof.

          "Funded Debt" of any Person means, on any date, the sum (determined
           -----------
     without duplication) of:  (a) all Debt of such Person that would be listed
     as long-term debt (including Capital Lease Obligations and Major Operating
     Lease Obligations) of such Person on a balance sheet of such Person
     prepared in accordance with GAAP (including, without limitation, the
     current portion of such Debt), plus (b) the aggregate principal amount of
                                    ----
     all outstanding Advances; provided that:
                               --------

               (1)  the term "Funded Debt" shall include letters of credit
          issued in connection with the insurance program of Terra and its
          Subsidiaries only to the extent of unreimbursed drawings thereunder;
          and

               (2)  the term "Funded Debt" shall not include Obligations under
          Hedge Agreements.

     For all purposes of this Agreement, "Funded Debt" shall not include
     Guarantees by Terra U.K. of Terra U.K. Customer Debt and Guarantees by TI
     of Terra Customer Debt.

          "GAAP" means generally accepted accounting principles in the United
           ----
     States of America as in effect as of the date of, and used in, the
     preparation of the audited financial statements referred to in Section
     4.01(f).
<PAGE>

                                      -14-

          "Governmental Authority" means any nation or government, any central
           ----------------------
     bank of any nation, any state, province, territory or other political
     subdivision thereof and any other agency, body, department, bureau,
     authority or other entity exercising executive, legislative, judicial,
     regulatory, monetary, taxing or administrative functions of or pertaining
     to government.

          "Guarantee" by any Person means any arrangement by which such Person
           ---------
     incurs Debt of the types referred to in clauses (i) and (j) of the
     definition of "Debt" in respect of such Person.

          "Guaranteed Obligations" has the meaning assigned to such term in
           ----------------------
     Section 8.01.

          "Guarantors" means, collectively, (x) Terra, Terra Capital Holdings,
           ----------
     the Company, TNC, TI, BMCH, Beaumont Holdings, TMC, Terra U.K., BMLP, Port
     Neal Corporation, Terra Oklahoma, Terra U.K. Holdings and BAI and (y) from
     and after the SPU Redemption Time, TNLP and its successors.

          "Hazardous Materials" means (a) petroleum or petroleum products,
           -------------------
     natural or synthetic gas, asbestos in any form that is or could become
     friable, and radon gas, (b) any substances defined as or included in the
     definition of "hazardous substances", "hazardous wastes", "hazardous
     materials", "extremely hazardous wastes", "restricted hazardous wastes",
     "toxic substances", "toxic pollutants", "contaminants" or "pollutants", or
     words of similar meaning and regulatory effect, under any Environmental Law
     and (c) any other substance exposure to which is regulated under any
     Environmental Law.

          "Hedge Agreements" means interest rate swap, cap or collar agreements,
           ----------------
     interest rate future or option contracts, currency swap agreements,
     currency future or option contracts, commodity future or option agreements
     and other similar agreements designed to hedge against fluctuations in
     interest rates, foreign exchange rates or commodity prices, including,
     without limitation, the Ammonium Nitrate Hedging Agreement.

          "Holdings Pledge Agreement" means an Amended and Restated Pledge
           -------------------------
     Agreement in substantially the form attached hereto as Exhibit B-1 between
     Terra Capital Holdings and the Collateral Agent, as amended from time to
     time.

          "ICI" means, collectively, ICI Chemicals & Polymers Limited and
           ---
     Imperial Chemical Industries Plc.

          "Immaterial Subsidiary" means, as of any date of determination, any
           ---------------------
     Subsidiary of Terra with not more than $500,000 of assets on such date nor
     more than $100,000 of gross income for the fiscal year of Terra ended on or
     most recently ended prior to such date.

          "Indemnified Party" has the meaning specified in Section 9.04(b).
           -----------------
<PAGE>

                                      -15-

          "Initial Lenders" has the meaning specified in the recital of the
           ---------------
     parties to this Agreement.

          "Insufficiency" means, with respect to any Plan at any time, the
           -------------
     amount, if any, by which the "accumulated benefit obligation" (as defined
     in Statement of Financial Accounting Standards 87) exceeds the fair market
     value of the assets of such Plan as of the date of the most recent
     actuarial valuation for such Plan, calculated using the actuarial methods,
     factors and assumptions used in such valuation.

          "Intercompany Debt" means Debt owed by Terra or one of its
           -----------------
     Subsidiaries to Terra or one of its Subsidiaries.

          "Intercompany Receivables Facility" means a facility entered into by
           ---------------------------------
     the Company and/or any of its Subsidiaries, as sellers, and one or more
     Receivables Subsidiaries, as purchasers, providing for the sale of
     Receivables by said sellers to said purchasers.

          "Intercreditor Agreement" means the Collateral Agency and
           -----------------------
     Intercreditor Agreement attached as Exhibit G among the Borrower, certain
     of the other Obligors, the Collateral Agent, the Administrative Agent and
     the other Secured Parties referred to therein (or representatives on their
     behalf), as amended from time to time.

          "Interest Coverage Ratio" means, for any period, the ratio of:
           -----------------------

               (1) EBITDA of Terra and its Subsidiaries on a Consolidated basis
          for such period to

               (2) Cash Interest Expense of Terra and its Subsidiaries on a
          Consolidated basis for such period.

          In addition, solely for purposes of Section 5.04, in determining the
     Interest Coverage Ratio on any date or for any period when any Special
     Refinancing Debt is outstanding, EBITDA and Cash Interest Expense shall be
     determined as follows during the period from the date on which such Special
     Refinancing Debt is incurred until the Refinanceable Debt is refinanced or
     replaced in accordance with Section 5.02(b)(1)(xix)(I):

               (1) the EBITDA component shall be determined excluding interest
          expense on either such Special Refinancing Debt or the related
          Refinanceable Debt, whichever is lower in aggregate outstanding
          principal amount (the "Excluded Debt"); and
                                 -------------
<PAGE>

                                      -16-


               (2)  the Cash Interest Expense component shall be determined
          excluding interest expense on such Excluded Debt.

          "Interest Period" means, for each Eurodollar Rate Advance, the period
           ---------------
     commencing on the date of such Eurodollar Rate Advance or the date of the
     Conversion of any Base Rate Advance into such Eurodollar Rate Advance, and
     ending on the last day of the period selected by the Borrower pursuant to
     the provisions below and, thereafter, each subsequent period commencing on
     the last day of the immediately preceding Interest Period and ending on the
     last day of the period selected by the Borrower pursuant to the provisions
     below.  The duration of each such Interest Period shall be one, two, three
     or six months, as the Borrower may, upon notice received by the
     Administrative Agent not later than 10:00 A.M. (New York City time) on the
     second Business Day prior to the first day of such Interest Period, select;
     provided that:
     --------

               (a)  the Borrower may not select any Interest Period that ends
          after any Principal Prepayment Date unless, after giving effect
          thereto, the aggregate principal amount of Advances having Interest
          Periods that end after such Principal Prepayment Date shall be equal
          to or less than the aggregate principal amount of Advances scheduled
          to be outstanding after giving effect to the payments of principal
          required to be made on such Principal Prepayment Date;

               (b)  no Interest Period for any Advance may end after the
          Maturity Date;

               (c)  whenever the last day of any Interest Period would otherwise
          occur on a day other than a Business Day, the last day of such
          Interest Period shall be extended to occur on the next succeeding
          Business Day, provided that, if such extension would cause the last
                        --------
          day of such Interest Period to occur in the next following calendar
          month, the last day of such Interest Period shall occur on the next
          preceding Business Day; and

               (d)  whenever the first day of any Interest Period occurs on the
          last day of a calendar month (or on any day for which there is no
          numerically corresponding day in the appropriate subsequent calendar
          month), such Interest Period shall end on the last Business Day of the
          appropriate subsequent calendar month.

          "Internal Revenue Code" means the Internal Revenue Code of 1986, as
           ---------------------
     amended from time to time, and the regulations promulgated and rulings
     issued thereunder.

          "Investment" in any Person means any loan or advance to such Person,
           ----------
     any purchase or other acquisition of any capital stock, warrants, rights,
     options, obligations or other securities of such Person, any capital
     contribution to such Person or any other investment in such Person,
     including, without limitation, (a) any arrangement pursuant to which the
     investor Guarantees Debt of another Person, (b) the acquisition of all or
     substantially all of the assets of such Person or of any division of such
     Person, and (c)
<PAGE>

                                      -17-

     any merger of or consolidation with such Person; provided that the purchase
                                                      --------
     of equipment, fixed assets, real property or improvements from such Person
     do not constitute Investments in such Person to the extent the same
     constitute Capital Expenditures.

          "Lenders" means the Initial Lenders listed on the signature pages
           -------
     hereof and each Eligible Assignee that shall become a party hereto pursuant
     to Section 9.07.

          "Lien" means any lien, security interest or other charge or
           ----
     encumbrance of any kind, contractual or statutory, or any other type of
     preferential arrangement, including, without limitation, the lien or
     retained security title of a conditional vendor and any easement, right of
     way or other encumbrance on title to real property.

          "Loan Documents" means, collectively, this Agreement, the Notes, the
           --------------
     Security Documents and the Loan Purchase Agreement.

          "Loan Purchase Agreement" means the Loan Purchase Agreement attached
           -----------------------
     as Exhibit E-1 between the Administrative Agent and Terra, as modified by
     the Confirmation of Loan Purchase Agreement in substantially the form of
     Exhibit E and as further amended from time to time.

          "Major Operating Lease Obligations" means, for any Person, all
           ---------------------------------
     obligations of such Person under an operating lease to pay required
     termination payments or like payments in an amount exceeding $7,000,000 and
     in an amount at least equal to 75% of the original acquisition cost of the
     leased property under such operating lease.

          "Management Agreements" means one or more management agreements
           ---------------------
     between Terra and/or certain of its Subsidiaries and other Persons
     providing for the performance by Terra or any of such Subsidiaries of
     certain treasury, purchasing, legal and/or other services for its
     Subsidiaries and such other Persons, as such agreements are in effect from
     time to time.

          "Margin Stock" has the meaning specified in Regulations U and X.
           ------------

          "Material Adverse Change" means, with respect to any Person, any
           -----------------------
     material adverse change in the business, assets, operations, properties or
     financial condition of such Person and its Subsidiaries taken as a whole,
     or any material adverse change in the contingent liabilities of such Person
     which could reasonably be expected to result in any of the foregoing, other
     than any of the foregoing resulting solely from (i) a general economic
     change in the industry of such Person and its Subsidiaries or (ii) the sale
     by Terra of the Distribution Business on the terms and conditions as set
     forth in the Distribution Business Sale Agreement.
<PAGE>

                                      -18-

          "Material Adverse Effect" means a material adverse effect on (a) the
           -----------------------
     business, assets, operations, properties or financial condition of Terra
     and its Subsidiaries taken as a whole, or a material adverse effect on the
     contingent liabilities of such Person which could reasonably be expected to
     result in any of the foregoing (other than any of the foregoing resulting
     solely from the sale by Terra of the Distribution Business on the terms and
     conditions as set forth in the Distribution Business Sale Agreement), (b)
     the rights and remedies of the Administrative Agent or any Lender under any
     Loan Document or (c) the ability of any Obligor to perform its Obligations
     under any Loan Document to which it is or is to be a party.

          "Material Contract" means:
           -----------------

               (A)  each Hedge Agreement;

               (B)  each contract to which Terra or any of its Subsidiaries is a
          party (a "Specified Party") that (a) provides for the provision of
                    ---------------
          goods or services by the Specified Party or the receipt of goods or
          services by the Specified Party, (b) has a term of more than one year
          (unless such contract may be cancelled at the sole option of another
          Person party to such contract), (c) involves the payment or receipt by
          the Specified Party of consideration having a fair market value in
          excess of $1,000,000 in any fiscal year of Terra and (d) provides for
          either: (i) the provision of goods or services to another Person that
          is obligated to purchase from the Specified Party a specified quantity
          of such goods or services (but only to the extent that, if such other
          Person did not purchase such quantity of such goods or services, the
          Specified Party would not be readily able to sell such goods or
          services at a price equal to or higher than the price set in such
          contract) or (ii) the receipt of goods or services from another Person
          that is obligated to supply to the Specified Party a specified
          quantity of such goods or services (but only to the extent that, if
          such other Person did not supply such quantity of such goods or
          services, the Specified Party would not be readily able to purchase
          such goods or services at a price less than or equal to the price set
          in such contract); and

               (C)  each contract to which Terra or any of its Subsidiaries is a
          party that, if such contract were to be terminated or the obligations
          of any other Person party to such contract were to fail to be in full
          force and effect, could reasonably be expected, either individually or
          in the aggregate with any other such event, to have a Material Adverse
          Effect.

          "Material Subsidiary" means any Subsidiary of Terra other than an
           -------------------
     Immaterial Subsidiary.

          "Maturity Date" means January 2, 2003 (or, if such date is not a
           -------------
     Business Day, the next succeeding Business Day).
<PAGE>

                                      -19-

          "Minorco" means Minorco, S.A., a Luxembourg societe anonyme, and its
           -------
     successors.

          "Moody's" means Moody's Investors Service, Inc. and its successors.
           -------

          "Mortgages" means, collectively, the Terra Oklahoma Mortgage, the BMLP
           ---------
     Mortgage and the Port Neal Corporation Mortgage and each other Mortgage
     covering real and other property of one or more of the Obligors as may be
     executed and delivered in accordance with the terms and conditions set
     forth herein.

          "Multiemployer Plan" of any Person means a multiemployer plan, as
           ------------------
     defined in Section 4001(a)(3) of ERISA, to which such Person or any of its
     ERISA Affiliates is making or accruing an obligation to make contributions,
     or has within any of the preceding five plan years made or accrued an
     obligation to make contributions.

          "Multiple Employer Plan" of any Person means a single employer plan,
           ----------------------
     as defined in Section 4001(a)(15) of ERISA, that (a) is maintained for
     employees of such Person or any of its ERISA Affiliates and at least one
     Person other than such Person and its ERISA Affiliates or (b) was so
     maintained and in respect of which such Person or any of its ERISA
     Affiliates has or would have liability under Section 4064 or 4069 of ERISA
     in the event such plan has been or were to be terminated.

          "New York Process Agent" has the meaning assigned to such term in
           ----------------------
     Section 9.06(b).

          "1995 Terra Capital Credit Agreement" means the Amended and Restated
           -----------------------------------
     Credit Agreement dated as of December 14, 1995 among the Company and TNLP,
     as Borrowers, certain guarantors, the lenders and issuing banks party
     thereto and Citibank, N.A., as Agent, as amended to but excluding the date
     hereof.

          "1995 Terra Debt" means Debt incurred by Terra under the 1995 Terra
           ---------------
     Debt Indenture.

          "1995 Terra Debt Indenture" means the Indenture dated as of June 22,
           -------------------------
     1995 between Terra and First Trust National Association, as Trustee,
     providing for the issuance of Terra's 10.50% Senior Notes, as from time to
     time amended.

          "Note" means a promissory note of the Borrower payable to the order of
           ----
     a Lender, in substantially the form of Exhibit A, as from time to time
     amended.

          "Obligation" means, with respect to any Person, any obligation of such
           ----------
     Person of any kind, including, without limitation, any liability of such
     Person on any claim, whether or not the right of any creditor to payment in
     respect of such claim is reduced to judgment, liquidated, unliquidated,
     fixed, contingent, matured, disputed, undisputed,
<PAGE>

                                      -20-

     legal, equitable, secured or unsecured, and whether or not such claim is
     discharged, stayed or otherwise affected by any proceeding referred to in
     Section 6.01(g). Without limiting the generality of the foregoing, the
     Obligations of the Obligors under the Loan Documents include (a) their
     respective obligations to pay principal, interest, charges, expenses, fees,
     attorneys' fees and disbursements, indemnities and other amounts payable
     under any Loan Document and (b) their respective obligations to reimburse
     any amount in respect of any of the foregoing that any Lender, in its sole
     discretion, may elect to pay or advance on behalf of such Obligor.

          "Obligors" means the Borrower and the Guarantors.
           --------

          "OECD" means the Organization for Economic Cooperation and
           ----
     Development.

          "Other Distribution" means a Dividend Payment made with respect to the
           ------------------
     capital stock of the Company except to the extent that the Company
     determines, reasonably and in good faith, that such Dividend Payment (1) is
     made to fund one or more of the items described in the definition of
     "Specified Payments" in this Section 1.01 or (2) is made out of the then-
     available amount of Cumulative Adjusted Net Income.

          "Other Taxes" has the meaning specified in Section 2.10(b).
           -----------

          "Outside Subsidiary" means any Subsidiary of Terra (other than Terra
           ------------------
     Capital Holdings or any of its Subsidiaries).

          "PBGC" means the Pension Benefit Guaranty Corporation.
           ----

          "Permitted Investments" means:
           ---------------------

               (a)  direct obligations of the United States of America, or of
          any agency thereof, or obligations guaranteed as to principal and
          interest by the United States of America, or by any agency thereof, in
          either case maturing not more than one year from the date of
          acquisition thereof;

               (b)  readily marketable direct obligations of the United States
          of America, or of any agency thereof, or readily marketable
          obligations guaranteed as to principal and interest by the United
          States of America, or by any agency thereof, in either case maturing
          not more than one year from the date of acquisition thereof;

               (c)  readily marketable direct obligations issued by any State of
          the United States of America or any political subdivision thereof or
          of the government of Canada or the United Kingdom or any agency
          thereof, in each case maturing not more than one year from the date of
          acquisition thereof and having the highest credit rating obtainable
          from either of Moody's or Standard & Poor's;
<PAGE>

                                      -21-

               (d)  money market mutual funds (including, without limitation,
          tax-free money market mutual funds) with assets consisting solely of
          U.S. Dollars and securities principally of the types described in
          paragraphs (a), (b) and (c) in this definition;

               (e)  certificates of deposit issued by, repurchase and reverse
          repurchase agreements with, banker's acceptances of, and eurodollar
          time deposits with, any Initial Lender or any bank or trust company
          organized under the laws of the United States of America or any state
          thereof, having capital, surplus and undivided profits of at least
          $500,000,000 (or any national or regional brokerage firm) and whose
          unsecured, unguaranteed long-term senior debt obligations are rated at
          least A by Standard & Poor's and at least A2 by Moody's, maturing not
          more than 270 days from the date of acquisition thereof;

               (f)  obligations of not more than $100,000 in the aggregate at
          any one time of any bank or bank holding company with a capital and
          surplus of less than $500,000,000 or whose unsecured, unguaranteed
          long-term senior debt obligations are rated less than A by Standard &
          Poor's or less than A2 by Moody's;

               (g)  commercial paper and variable rate demand notes, in each
          case rated at least A-1 by Standard & Poor's or at least P-1 by
          Moody's and maturing not more than 270 days from the date of
          acquisition thereof;

               (h)  tax-exempt auction rate preferred stock and taxable and tax-
          exempt auction rate securities, in each case rated at least AAA by
          Standard & Poor's and Aaa by Moody's and maturing not more than 60
          days from the date of acquisition thereof;

               (i)  "Liquidity Optimized Guaranteed Investment Contracts" with
          insurance companies having short-term debt ratings of at least A-1 by
          Standard & Poor's and P-1 by Moody's and maturing not more than 30
          days from the date of acquisition thereof;

               (j)  Canadian dollar-denominated banker's acceptances of Canadian
          banks rated at least R1-mid by Dominion Bond Rating Service
          ("Dominion") and maturing not more than one year from the date of
            --------
          acquisition thereof; and

               (k)  Canadian dollar-denominated commercial paper rated at least
          R1-mid by Dominion and maturing not more than one year from the date
          of acquisition thereof; and
<PAGE>

                                      -22-

               (l)  solely with respect to Terra U.K., (i) British government
          bonds maturing not more than one year from the date of acquisition
          thereof; (ii) money-market funds or composite funds with assets
          consisting solely of Pounds Sterling, high-quality short-term
          corporate securities and securities of the type described in clause
          (i) in this paragraph (l); and (iii) funds held in corporate accounts
          at banks organized under the laws of the United Kingdom having
          capital, surplus and undivided profits not less than $350,000,000 or
          at branches of U.S. banks located in the United Kingdom of the quality
          described in paragraph (e) above.

          "Permitted Liens" means such of the following as to which no
           ---------------
     enforcement, collection, execution, levy or foreclosure proceeding shall
     have been commenced (or, if such a proceeding has been commenced, such
     proceeding is being contested in good faith by appropriate proceedings and
     enforcement of any Lien has been and is stayed):

               (a) Liens for taxes, assessments and governmental charges or
          levies to the extent not required to be paid under Section 5.01(b),

               (b) Liens imposed by law, such as materialmen's, mechanics',
          carriers', workmen's and repairmen's Liens, statutory landlord's Liens
          and other similar Liens arising in the ordinary course of business
          securing obligations that are not overdue for a period of more than 30
          days or which are being contested in good faith and by appropriate
          proceedings,

               (c) pledges or deposits to secure obligations under workers'
          compensation laws or similar legislation or to secure public or
          statutory obligations,

               (d) deposits to secure the performance of bids, trade contracts
          (other than for borrowed money), leases (other than capital leases),
          surety and appeal bonds, and performance bonds and other obligations
          of a like nature incurred, in each case arising in the ordinary course
          of business,

               (e) as to any particular property at any time, such easements,
          encroachments, covenants, rights of way, minor defects, irregularities
          or encumbrances on title which do not materially impair the use of
          such property for the purpose for which it is held by the owner
          thereof,

               (f) municipal and zoning ordinances that are not violated in any
          material respect by the existing improvements and the present use made
          by the owner thereof, and

               (g) real estate taxes and assessments not yet delinquent.

          "Person" means an individual, partnership, corporation (including a
           ------
     business trust), joint stock company, limited liability company, trust,
     unincorporated association,
<PAGE>

                                      -23-

     joint venture or other entity, or a government or any political subdivision
     or agency thereof.

          "Plan" means a Single Employer Plan or a Multiple Employer Plan.
           ----

          "Port Neal Corporation" means Port Neal Corporation, a Delaware
           ---------------------
     corporation and a wholly owned Subsidiary of TI.

          "Port Neal Corporation Mortgage" means a Mortgage, Assignment of
           ------------------------------
     Rents, Security Agreement and Fixture Filing in substantially the form
     attached hereto as Exhibit B-7 between Port Neal Corporation and the
     Collateral Agent, as amended from time to time.

          "Post-Default Rate" means a rate per annum equal to 2% plus the
           -----------------                                     ----
     Applicable Margin plus the Base Rate as in effect from time to time.
                       ----

          "Pounds Sterling" and "(Pounds)" means lawful money of the United
           ---------------       --------
     Kingdom.

          "Preferred Stock" means, with respect to any corporation, capital
           ---------------
     stock issued by such corporation that is entitled to a preference or
     priority over any other capital stock issued by such corporation upon any
     distribution of such corporation's assets, whether by dividend or upon
     liquidation.

          "Principal Prepayment Date" means the Quarterly Date falling in
           -------------------------
     December of each year, commencing December 1999 through and including
     December 2001.

          "Pro Rata Share" of any amount means, with respect to any Lender at
           --------------
     any time, the product of (a) a fraction the numerator of which is the
     amount of such Lender's Advances and the denominator of which is the
     aggregate Advances at such time, multiplied by (b) such amount.
                                      -------------

          "Purchase Event" means that:
           --------------

               (1)  Liens on or with respect to any property of the Borrower or
          any of its Subsidiaries have been created in favor of Terra or any of
          its Subsidiaries, other than Liens permitted under any of clauses (i)
          through (xviii) of Section 5.02(a); or

               (2)  the Borrower or any of its Subsidiaries has any outstanding
          Debt owing to Terra or any of its Subsidiaries, other than Debt
          permitted to be outstanding under any of clauses (i) through (vii) of
          Section 5.02(b)(2); or

               (3)  the Borrower or any of its Subsidiaries has sold,
          transferred or otherwise disposed of any of its property to Terra or
          any of its Subsidiaries, other
<PAGE>

                                      -24-

          than sales, transfers or other dispositions permitted under any of
          clauses (i) through (ix) of Section 5.02(e); or

               (4)  the Borrower or any of its Subsidiaries has made any
          Investments in Terra or any of its Subsidiaries, other than
          Investments permitted under any of clauses (i) through (xv) of Section
          5.02(f); or

               (5)  Minorco ceases to own, directly or indirectly, at least 20%
          of the issued and outstanding shares of voting capital stock of Terra;
          or Minorco ceases to hold, directly or indirectly, a plurality of the
          issued and outstanding shares of capital stock of Terra.

          "Quarterly Dates" means March 31, June 30, September 30 and December
           ---------------
     31 in each year, the first of which shall be the first such day after the
     Closing Date, provided that, if any such day is not a Business Day, the
                   --------
     relevant Quarterly Date shall be the immediately preceding Business Day.

          "Ramp Up Period Multiplier" means, for any period, (x) four divided by
           -------------------------
     (y) the number of fiscal quarters of Terra that both begin and end during
     such period.

          "Receivables" means accounts and notes receivable and, in each case,
           -----------
     related reserves.

          "Receivables Facilities" means, collectively, (i) the August 1996
           ----------------------
     Receivables Purchase Agreement among Terra Funding Corporation, as Seller,
     the Company, as initial servicer, the financial institutions party thereto,
     as Purchasers, and Bank of America National Trust and Savings Association,
     as Agent and (ii) the Receivables Purchase Agreement dated as of March 31,
     1994 among TI, as Seller, the financial institutions party thereto, as
     Purchasers, and Bank of America National Trust and Savings Association,
     successor to Continental Bank N.A., as agent, as from time to time amended.

          "Receivables Subsidiary" means a Subsidiary of the Company that meets
           ----------------------
     both of the following criteria:

               (1)  such Subsidiary is formed solely for the purpose of, and is
          engaged solely in the business of, (x) purchasing Receivables of the
          Company and one or more of its Subsidiaries under an Intercompany
          Receivables Facility and/or (y) owning the capital stock of, or other
          ownership interests in, one or more Receivables Subsidiaries; and

               (2)  all of the capital stock of and/or other ownership interests
          in, such Subsidiary is owned beneficially and of record, directly or
          indirectly, by Terra
<PAGE>

                                      -25-

          Capital Holdings, the Company and/or one or more other Receivables
          Subsidiaries.

          "Redeemable" means any capital stock, Debt or other right or
           ----------
     Obligation that (a) the issuer thereof has undertaken to redeem at a fixed
     or determinable date or dates prior to the date on which the Advances are
     to mature, whether by operation of a sinking fund or otherwise, or upon the
     occurrence of a condition not solely within the control of the issuer or
     (b) is redeemable at the option of the holder thereof on any date prior to
     the date on which the Advances are to mature.  For purposes of this
     Agreement, the BMLP Class A Limited Partnership Interest shall not be
     deemed to be "Redeemable".

          "Reference Banks" means Citibank, NationsBank, N.A. and The Bank of
           ---------------
     Nova Scotia (or their respective Applicable Lending Offices, as the case
     may be).

          "Refinanceable Debt" has the meaning assigned to such term in Section
           ------------------
     5.02(b)(1)(xix)(I).

          "Register" has the meaning specified in Section 9.07(c).
           --------

          "Regulation U" and "Regulation X" mean Regulations U and X of the
           ------------       ------------
     Board of Governors of the Federal Reserve System, respectively, as in
     effect from time to time.

          "Required Lenders" means at any time Lenders owed or holding in the
           ----------------
     aggregate at least 51% of the sum of the then aggregate unpaid principal
     amount of the Advances.

          "Restatement Date" has the meaning assigned to such term in Section
           ----------------
     3.01.

          "Restricted Transactions" means, collectively, Capital Expenditures
           -----------------------
     and Specified Acquisitions.

          "Rolling Period" means (i) for the fiscal quarter of Terra ending in
           --------------
     June 1999, such fiscal quarter, (ii) for the fiscal quarter of Terra ending
     in September 1999, such fiscal quarter and the prior fiscal quarter of
     Terra, (iii) for the fiscal quarter of Terra ending in December 1999, such
     fiscal quarter and the prior two fiscal quarters of Terra and (iv)
     thereafter, any period of four consecutive fiscal quarters of Terra.

          "Security Documents" means, collectively, the Terra Capital Security
           ------------------
     Documents and the Terra Canada Security Documents.

          "Senior Financial Officer" means the Chief Financial Officer of Terra.
           ------------------------

          "Senior Preference Units" means, collectively, (a) the "Senior
           -----------------------
     Preference Units" issued and outstanding under, and as defined in, the
     Agreement of Limited Partnership dated as of December 4, 1991 of TNCLP, as
     such Agreement of Limited Partnership is in
<PAGE>

                                      -26-

     effect on the Closing Date, and (b) the "Common Units" into which such
     Senior Preference Units have been converted in accordance with Section 5.5
     of such Agreement of Limited Partnership.

          "Single Employer Plan" of any Person means a single employer plan, as
           --------------------
     defined in Section 4001(a)(15) of ERISA, that is subject to Title IV of
     ERISA and that (a) is maintained for employees or former employees of such
     Person or any of its ERISA Affiliates and no Person other than such Person
     and its ERISA Affiliates or (b) was so maintained and in respect of which
     such Person or any of its ERISA Affiliates has or would have liability
     under Section 4069 of ERISA in the event such plan has been or were to be
     terminated.

          "Solvent" and "Solvency" mean, with respect to any Person on a
           -------       --------
     particular date, that on such date (a) the fair value of the property of
     such Person is greater than the total amount of liabilities, including,
     without limitation, contingent liabilities, of such Person, (b) the present
     fair salable value of the assets of such Person is not less than the amount
     that will be required to pay the probable liability of such Person on its
     debts as they become absolute and matured, (c) such Person does not intend
     to, and does not believe that it will, incur debts or liabilities beyond
     such Person's ability to pay as such debts and liabilities mature and (d)
     such Person is not engaged in business or a transaction, and is not about
     to engage in business or a transaction, for which such Person's property
     would constitute an unreasonably small capital.

          "Special Refinancing Debt" has the meaning assigned to such term in
           ------------------------
     Section 5.02(b)(1)(xix).

          "Specified Acquisitions" means Investments (including, without
           ----------------------
     limitation, Investments arising by reason of any merger or consolidation
     permitted under Sections 5.02(d)(i)(y) and 5.02(d)(ii)(y), but excluding
     the Excluded Transactions) consisting of acquisitions of ownership
     interests in one or more entities engaged in the same or allied line or
     lines of business as Terra and its Subsidiaries, taken as a whole.

          "Specified Group" has the meaning specified in Section 5.02(e)(iii).
           ---------------

          "Specified Payments" means, for any period, (a) all interest due and
           ------------------
     payable on the AMCI Senior Notes and on the 1995 Terra Debt during such
     period, (b) all scheduled dividends payable during such period on
     convertible Preferred Stock or other equity securities issued and the
     proceeds of which were applied to prepay the "Advances" under the Terra
     Capital Credit Facility (to the extent the "Commitments" thereunder are
     reduced simultaneously with such issuance), (c) ordinary and necessary
     expenses incurred by Terra as a result of its operations as a publicly-held
     holding company and (d) other payments in an aggregate amount up to
     $5,000,000 per year to the extent required under pre-existing obligations.
<PAGE>

                                      -27-

          "SPU Redemption" means the purchase, redemption or other acquisition
           --------------
     from time to time of all or a portion of the outstanding Senior Preference
     Units by Terra and its Subsidiaries (or any of them):

               (a)  on such terms and conditions as could not reasonably be
          expected to have a Material Adverse Effect; and

               (b)  in accordance in all material respects with the terms and
          conditions hereof.

          "SPU Redemption Time" means the time as of which all of the Senior
           -------------------
     Preference Units shall have been purchased or otherwise redeemed pursuant
     to the SPU Redemption.

          "Standard & Poor's" means Standard & Poor's Ratings Services, a
           -----------------
     division of The McGraw-Hill Companies, Inc., and its successors.

          "Subordinated Indebtedness" means Debt of Terra or any of its
           -------------------------
     Subsidiaries the payment of which is subordinated (on reasonably
     satisfactory terms and pursuant to documentation satisfactory to the
     Required Lenders) in right of payment to the prior payment in full of the
     Advances.

          "Subsidiary" of any Person means any corporation, partnership, joint
           ----------
     venture, limited liability company, trust or estate of which (or in which)
     more than 50% of (a) the issued and outstanding capital stock having
     ordinary voting power to elect a majority of the board of directors of such
     corporation (irrespective of whether at the time capital stock of any other
     class or classes of such corporation shall or might have voting power upon
     the occurrence of any contingency), (b) the interest in the capital or
     profits of such partnership, joint venture or limited liability company or
     (c) the beneficial interest in such trust or estate is at the time directly
     or indirectly owned or controlled by such Person, by such Person and one or
     more of its other Subsidiaries or by one or more of such Person's other
     Subsidiaries.  For all purposes of this Agreement and the other Loan
     Documents, BMLP and each of BMLP's Subsidiaries shall be deemed to be
     Subsidiaries of the Company so long as TMC or one of TMC's Subsidiaries is
     the sole general partner of BMLP.

          "Subsidiary Guarantor" means, collectively, (a) TNC, BMCH, Beaumont
           --------------------
     Holdings, TMC, Terra U.K., BMLP, Port Neal Corporation, Terra Oklahoma,
     Terra U.K. Holdings and BAI and (b) each of the Borrower's other
     Subsidiaries that from time to time Guarantees the Advances.

          "Subsidiary Pledge and Security Agreement" means an Amended and
           ----------------------------------------
     Restated Pledge and Security Agreement in substantially the form attached
     hereto as Exhibit B-3 between certain of the Guarantors and the Collateral
     Agent, as amended from time to time.
<PAGE>

                                      -28-

          "Terra" means Terra Industries Inc., a Maryland corporation and an
           -----
     indirect parent of the Company.

          "Terra Canada Group" means, collectively, the Borrower and its
           ------------------
     Subsidiaries, and a "member" of the Terra Canada Group means, individually,
     the Borrower and each such Subsidiary.

          "Terra Canada Mortgage" means the Collateral Charge in favor of the
           ---------------------
     Administrative Agent covering (inter alia) the Borrower's Courtright,
                                    ----- ----
     Ontario manufacturing facility, attached as Exhibit B-6, as from time to
     time amended.

          "Terra Canada Security Agreement" means the General Security Agreement
           -------------------------------
     between the Borrower and the Administrative Agent attached as Exhibit B-5,
     as from time to time amended.

          "Terra Canada Security Documents" means, collectively, the Terra
           -------------------------------
     Canada Security Agreement, the Terra Canada Mortgage and each security
     agreement or other grant of security now or hereafter made by the Borrower
     to secure any of the Obligations hereunder and under the other Loan
     Documents, and all recordings, registrations and other filings required by
     this Agreement or any of the foregoing to be filed with respect to the
     Liens created pursuant thereto.

          "Terra Capital Credit Facility" means the Amended and Restated Credit
           -----------------------------
     Agreement dated as of June 25, 1999 among the Company, as Borrower, the
     lenders and issuing banks party thereto and Citibank, as administrative
     agent for said lenders and issuing banks, as from time to time amended.

          "Terra Capital Holdings" means Terra Capital Holdings, Inc., a
           ----------------------
     Delaware corporation and the direct parent of the Company.

          "Terra Capital Pledge and Security Agreement" means an Amended and
           -------------------------------------------
     Restated Pledge and Security Agreement in substantially the form attached
     hereto as B-2 between the Company and the Collateral Agent, as amended from
     time to time.

          "Terra Capital Security Documents" means, collectively, the Holdings
           --------------------------------
     Pledge Agreement, the Terra Capital Pledge and Security Agreement, the
     Subsidiary Pledge and Security Agreement, the TNLP Pledge and Security
     Agreement, the Mortgages, each security agreement or other grant of
     security now or hereafter made by any Guarantor to secure any of the
     Obligations hereunder and under the other Loan Documents, and all Uniform
     Commercial Code financing statements required by this Agreement or any of
     the foregoing to be filed with respect to the security interests in real or
     personal property created pursuant thereto.
<PAGE>

                                      -29-

          "Terra Customer Debt" means Debt of a customer of Terra or any of its
           -------------------
     Subsidiaries owing to Deere and Company ("Deere") or any of Deere's
                                               -----
     Subsidiaries, provided that:
                   --------

               (1)  such customer is required to repay such Debt in full within
          15 months of the date on which such Debt is incurred;

               (2)  in the reasonable opinion of the TI, such customer is
          creditworthy; and

               (3)  it is a condition of the extension of credit by Deere or its
          Subsidiaries to such customer that TI Guarantees a portion of such
          Debt.

          "Terra Oklahoma" means Terra International (Oklahoma) Inc., a Delaware
           --------------
     corporation and a wholly owned Subsidiary of TI.

          "Terra Oklahoma Mortgage" means a Mortgage, Assignment of Rents,
           -----------------------
     Security Agreement and Fixture Filing in substantially the form attached
     hereto as Exhibit B-7 between Terra Oklahoma and the Collateral Agent, as
     amended from time to time.

          "Terra U.K." means Terra Nitrogen (U.K.) Limited, a corporation formed
           ----------
     under the laws of England and a wholly owned Subsidiary of the Borrower.

          "Terra U.K. Customer Debt" means Debt of a customer of Terra U.K.
           ------------------------
     owing to Capital Bank Plc or another financial institution in the United
     Kingdom, provided that:
              --------

               (1)  such customer uses the entire principal proceeds of such
          Debt to pay for goods and services purchased from Terra U.K.;

               (2)  such customer is required to repay such Debt in full within
          12 months of the date on which such Debt is incurred;

               (3)  in the reasonable opinion of Terra U.K., such customer is
          creditworthy; and

               (4)  it is a condition of the extension of credit by Capital Bank
          Plc (or such other financial institution) to such customer that Terra
          U.K. Guarantee a portion of such Debt.

          "Terra U.K. Holdings" means Terra (U.K.) Holdings, Inc., a Delaware
           -------------------
     corporation and a direct Subsidiary of BMLP.

          "Terra U.K. Offtake Agreement" means, collectively, one or more
           ----------------------------
     nitrogen products offtake agreements between the Company and Terra U.K.
     entered into in
<PAGE>

                                      -30-

     connection with the transactions contemplated by the BMLP Partnership
     Agreement and the BMLP Support and Option Agreement, as from time to time
     amended.

          "Terra U.K. Term Loan" has the meaning specified in Section
           --------------------
     5.02(b)(2)(vi).

          "Terra U.K. Term Loan Agreement" means the credit agreement dated as
           ------------------------------
     of December 31, 1997 providing for the Terra U.K. Term Loan, as from time
     to time amended.

          "TI" means Terra International, Inc., a Delaware corporation and a
           --
     wholly owned Subsidiary of the Company.

          "TMC" means Terra Methanol Corporation, a Delaware corporation.
           ---

          "TNC" means Terra Nitrogen Corporation, a Delaware corporation and a
           ---
     wholly owned Subsidiary of the Company.

          "TNCLP" means Terra Nitrogen Company, L.P., a Delaware limited
           -----
     partnership and a Subsidiary of the Company.

          "TNLP" means Terra Nitrogen, Limited Partnership, a Delaware limited
           ----
     partnership and a Subsidiary of the Company.

          "TNLP Notes" has the meaning assigned to such term in Section
           ----------
     5.02(b)(2)(ii).

          "TNLP Pledge and Security Agreement" means an Amended and Restated
           ----------------------------------
     Pledge and Security Agreement in substantially the form attached hereto as
     Exhibit B-4 between TNLP and the Collateral Agent, as amended from time to
     time.

          "Type" refers to the distinction between Advances bearing interest at
           ----
     the Base Rate and Advances bearing interest at the Eurodollar Rate.

          "U.K. Nitrogen Assets" means the "Assets", as defined in the Sale of
           --------------------
     Business Agreement relating to the ICI Fertilizer Business dated November
     20, 1997 between ICI, Terra U.K. and Terra.

          "U.S. Dollars" and "$" means lawful money of the United States of
           ------------       -
     America.

          Section 1.02.  Computation of Time Periods. In this Agreement in the
                         ---------------------------
computation of periods of time from a specified date to a later specified date,
the word "from" means "from and including" and the words "to" and "until" mean
"to but excluding".

          Section 1.03.  Accounting Terms. All accounting terms not specifically
                         ----------------
defined herein shall be construed in accordance with GAAP.

<PAGE>


                                      -31-

                                  ARTICLE II

                       AMOUNTS AND TERMS OF THE ADVANCES

          Section 2.01.  The Advances.
                         ------------

          (a)  Outstanding Advances; Assignments.
               ---------------------------------

          (i)  The parties hereto agree that, on and after the Restatement Date,
     all Existing Advances shall be advances of the Lenders ("Advances")
                                                              --------
     outstanding hereunder, it being the intention of the parties hereto that
     the Existing Advances shall continue and remain outstanding and not be
     repaid on the Restatement Date.

          (ii) In accordance with Section 9.07(a) of the Existing Credit
     Agreement, the Existing Lenders hereby sell and assign to the Initial
     Lenders, and the Initial Lenders hereby purchase and assume from the
     Existing Lenders, all of the right, title and interest of the Existing
     Lenders in and to the Existing Advances and Existing Notes and the other
     rights and obligations of the Existing Lenders under the Existing Credit
     Agreement as of the Restatement Date, in each case such that, after giving
     effect to such sale and assignment, the amounts of the Advances
     respectively owing to each Initial Lender hereunder as of the Restatement
     Date will be as set forth on Schedule 2.01 opposite the name of such
     Initial Lender under the caption "Outstanding Advances".

          Each Existing Lender represents and warrants that, on and as of the
Restatement Date, it is the legal and beneficial owner of the interest being
assigned by it under this Section 2.01(a) and that such interest is free and
clear of any adverse claim created by such Existing Lender.  No Existing Lender
makes any representation or warranty or assumes any responsibility with respect
to any statements, warranties or representations made in or in connection with
this Agreement or any other Loan Document or the execution, legality, validity,
enforceability, genuineness, sufficiency or value of this Agreement, any other
Loan Document or any other instrument or document furnished pursuant hereto or
thereto; and no Existing Lender makes any representation or warranty or assumes
any responsibility with respect to the financial condition of any Obligor or the
performance or observance by any Obligor of any of its obligations hereunder or
under any other Loan Document or any other instrument or document furnished
pursuant hereto or thereto.  Except as expressly set forth in this Section
2.01(a), the sales and assignments of Existing Advances is made without recourse
to or representation or warranty by the Existing Lenders.

          The Administrative Agent hereby waives payment of the processing and
recordation fees referred to in Section 9.07 of the Existing Credit Agreement
with respect to the assignments effected under this Section 2.01(a).
<PAGE>

                                      -32-

          (b)  No Responsibility to Third Parties.  Neither the Administrative
               ----------------------------------
Agent nor any Lender shall have any responsibility as to the application or use
of any of the proceeds of any Advance.

          Section 2.02.  Effecting the Assignments of the Advances.
                         -----------------------------------------

          (a) (i)  The assignment of the Advances provided for by Section
2.01(a) shall be made on notice, given not later than 11:00 A.M. (New York City
time) on the Business Day of (or, if the Advances to be assigned are Eurodollar
Rate Advances, 10:00 A.M. (New York City time) on the second Business Day prior
to the date of) the proposed Restatement Date, by the Borrower to the
Administrative Agent, which shall give to each Lender prompt notice thereof by
telex, telecopier or cable.  Such notice (the "Restatement Date Notice") shall
                                               -----------------------
be by telex, telecopier or cable, confirmed immediately in writing, in
substantially the form of Exhibit C, specifying therein (1) the requested
Restatement Date, (2) the requested Type of Advances to be Continued or
Converted on the Restatement Date and (3) if Eurodollar Rate Advances are to be
Continued or Converted on the Restatement Date, the requested Interest Period
therefor.

          (ii)   If Eurodollar Rate Advances are to be Continued or Converted on
     the Restatement Date, the Administrative Agent shall promptly notify each
     Lender of the applicable interest rate under Section 2.06(a)(ii).

          (iii)  Each Lender shall, before 1:00 P.M. (New York City time) on the
     Restatement Date, make available for the account of its Applicable Lending
     Office to the Administrative Agent at the Administrative Agent's Account,
     in same day funds, such Lender's ratable portion of the Advances to be
     acquired by it on such date pursuant to Section 2.01(a).  After the
     Administrative Agent's receipt of such funds and upon fulfillment of the
     applicable conditions set forth in Article III, the Administrative Agent
     will transfer same day funds to the Lenders entitled thereto.

          (b)    Anything in subsection (a) above to the contrary
notwithstanding, Eurodollar Rate Advances may not be outstanding under more than
8 separate Interest Periods at any one time.

          (c)    The Restatement Date Notice shall be irrevocable and binding on
the Borrower.  If the Advances to be assigned on the Restatement Date are to
constitute Eurodollar Rate Advances, the Borrower shall indemnify each Lender
against any loss, cost or expense incurred by such Lender as a result of any
failure to fulfill on or before the date specified in the Restatement Date
Notice the applicable conditions set forth in Article III, including, without
limitation, any loss (including loss of anticipated profits), cost or expense
incurred by reason of the liquidation or reemployment of deposits or other funds
acquired by such Lender to fund the Advance to be acquired by such Lender when
such Advance, as a result of such failure, is not assigned to it on such date.
<PAGE>

                                      -33-

          (d)  Unless the Administrative Agent shall have received notice from a
Lender (a "Non-Paying Lender") prior to 12:00 Noon (New York City time) on the
           -----------------
Restatement Date that such Non-Paying Lender will not make available to the
Administrative Agent such Non-Paying Lender's purchase price for the ratable
portion of the Advances to be acquired by it on such date, the Administrative
Agent may assume that such Non-Paying Lender has made such portion available to
the Administrative Agent on the Restatement Date in accordance with Section
2.02(a) and the Administrative Agent may, in reliance upon such assumption, make
available to the other Lenders (the "Recipients") on such date a corresponding
                                     ----------
amount.  If and to the extent that such Non-Paying Lender shall not have so made
such ratable portion available to the Administrative Agent and the
Administrative Agent shall have made available such corresponding amount to the
Recipients, such Non-Paying Lender and the Recipients severally agree to repay
to the Administrative Agent forthwith on demand such corresponding amount
together with interest thereon, for each day from the Restatement Date until the
date such amount is repaid to the Administrative Agent, at the Federal Funds
Rate.  If such Non-Paying Lender shall repay to the Administrative Agent such
corresponding amount, such amount so repaid shall constitute such Lender's
Advance for purposes of this Agreement.

          (e)  The failure of any Lender to pay to the Administrative Agent the
ratable portion of the Advances to be acquired by it on the Restatement Date
shall not relieve any other Lender of its obligation, if any, hereunder to pay
to the Administrative Agent the ratable portion of the Advances to be so
acquired by such Lender, but no Lender shall be responsible for the failure of
any other Lender to perform such other Lender's obligations hereunder.

          Section 2.03.  Repayment. The Borrower hereby promises to pay to the
                         ---------
Administrative Agent for the account of each Lender the full outstanding
principal amount of such Lender's Advances on the Maturity Date. All repayments
of principal under this Section 2.03 shall be made together with interest
accrued to the date of such repayment on the principal amount repaid. Advances
once prepaid may not be reborrowed.

          Section 2.04. Termination of the Commitments. The "Commitments" under
                        ------------------------------
the Existing Credit Agreement were automatically and permanently reduced to zero
on December 31, 1997. Such "Commitments" may not be reinstated .

          Section 2.05.  Prepayments.
                         -----------

          (a)  Optional.  The Borrower may, upon at least two Business Days'
               --------
notice (in the case of prepayment of Eurodollar Rate Advances) or upon notice
given on the date of prepayment (in the case of prepayments of Base Rate
Advances) to the Administrative Agent (which notice shall state the proposed
date and aggregate principal amount of the prepayment), and if such notice is
given the Borrower shall, prepay the outstanding principal amount of the
Advances in the aggregate amount and on the date specified in such notice,
together with accrued interest to the date of such prepayment on the principal
amount prepaid; provided that (x) each partial prepayment shall be in an
                --------
aggregate principal amount of $3,000,000 or an integral multiple of $1,000,000
in excess thereof, (y) any such prepayment of a Eurodollar Rate Advance
<PAGE>

                                      -34-

other than on the last day of the Interest Period therefor shall be accompanied
by, and subject to, the payment of any amount payable under Section 9.04(c) in
respect of such prepayment and (z) each such notice shall be made on the
relevant day not later than, in the case of prepayments of Eurodollar Rate
Advances, 10:00 A.M. (New York City time) and, in the case of prepayments of
Base Rate Advances, 12:00 Noon (New York City time). Optional prepayments
pursuant to this paragraph (a) shall be applied to the installments of the
Advances set forth in paragraph (b) below in the direct order of their
maturities.

          (b)  Mandatory.  The Borrower shall prepay the Advances on the
               ---------
Principal Prepayment Dates as follows:

<TABLE>
<CAPTION>
          Principal Prepayment Date          Amount of Prepayment
          -------------------------          --------------------
          <S>                                <C>
          Quarterly Date in
           December 1999                          $7,812,500.00

          Quarterly Date in
           December 2000                          $7,812,500.00

          Quarterly Date in
           December 2001                          $7,812,500.00
</TABLE>

Optional prepayments pursuant to paragraph (a) above shall be applied to the
installments of the Advances set forth in this paragraph (b) in the direct order
of their maturities.

          (c)  All Prepayments.  Each prepayment of Advances under Sections
               ---------------
2.05(a) and (b) shall be made for account of the Lenders according to their
respective Pro Rata Shares of the principal amount of the Advances then
outstanding.  Advances once prepaid may not be reborrowed.

          Section 2.06.  Interest.
                         --------


          (a)  Ordinary Interest.  The Borrower shall pay interest on the unpaid
               -----------------
principal amount of each Advance owing to each Lender from the date of such
Advance until such principal amount shall be paid in full at the following rates
per annum:

          (i)  Base Rate Advances.  While such Advance is a Base Rate Advance, a
               ------------------
     rate per annum equal at all times to the sum of (1) the Base Rate in effect
     from time to time plus (2) the Applicable Margin in effect from time to
                       ----
     time, payable in arrears quarterly on each Quarterly Date and on the date
     such Base Rate Advance shall be Converted (but only on the amount
     Converted) or paid in full.

          (ii) Eurodollar Rate Advances.  While such Advance is a Eurodollar
               ------------------------
     Rate Advance, a rate per annum equal at all times during each Interest
     Period for such
<PAGE>

                                      -35-

     Advance to the sum of (1) the Eurodollar Rate for such Interest Period for
     such Advance plus (2) the Applicable Margin in effect from time to time,
                  ----
     payable in arrears on the last day of such Interest Period and, if such
     Interest Period has a duration of more than three months, on each three-
     month anniversary of the first day of such Interest Period occurring during
     such Interest Period.

          (b)  Post-Default Interest.  If (a) any Obligor shall fail to pay when
               ---------------------
due (by acceleration or otherwise) any amount payable under any Loan Document
after any applicable grace period provided in Section 6.01(a), or (b) (i) an
Event of Default shall have occurred and be continuing during any period and
(ii) the Administrative Agent or the Required Lenders, through the
Administrative Agent, shall have notified the Borrower thereof, the Borrower
shall, notwithstanding anything else in this Agreement to the contrary, pay to
the Administrative Agent for account of each Lender interest, during such
period, at the applicable Post-Default Rate on the outstanding principal of each
Advance, and on any other amount whatsoever then due and payable by the Borrower
hereunder or under the Notes held by such Lender to or for account of such
Lender, such interest to be payable from time to time on demand.

          Section 2.07.  Conversion and Continuation of Advances.
                         ---------------------------------------

          (a)  Optional Conversion.  The Borrower may on any Business Day, upon
               -------------------
notice given to the Administrative Agent not later than 10:00 A.M. (New York
City time) on the second Business Day prior to the date of the proposed
Conversion and subject to the provisions of Sections 2.08 and 2.09, Convert all
or any portion of the Advances of one Type (and, in the case of Eurodollar Rate
Advances, having the same Interest Period); provided that any Conversion of
                                            --------
Eurodollar Rate Advances into Base Rate Advances shall be made only on the last
day of an Interest Period for such Eurodollar Rate Advances, any Conversion of
Base Rate Advances into Eurodollar Rate Advances shall be in an amount not less
than $3,000,000 or an integral multiple of $1,000,000 in excess thereof and no
Conversion of any Advances shall result in more than 8 separate Interest Periods
being outstanding.  Each such notice of Conversion shall, within the
restrictions specified above, specify (i) the date of such Conversion, (ii) the
aggregate amount and Type of the Advances (and, in the case of Eurodollar Rate
Advances, the Interest Period therefor) to be Converted and (iii) if such
Conversion is into Eurodollar Rate Advances, the duration of the initial
Interest Period for such Advances.  Each notice of Conversion shall be
irrevocable and binding on the Borrower.

          (b)  Certain Mandatory Conversions.
               -----------------------------

          (i)  On the date on which the aggregate unpaid principal amount of
     Eurodollar Rate Advances having the same Interest Period shall be reduced,
     by payment or prepayment or otherwise, to less than $3,000,000 such
     Advances shall automatically Convert into Base Rate Advances.

          (ii) If the Borrower shall fail to select the duration of any Interest
     Period for any outstanding Eurodollar Rate Advances in accordance with the
     provisions contained in the
<PAGE>

                                      -36-

     definition of "Interest Period" in Section 1.01 and in clause (a) or (c) of
     this Section 2.07, the Administrative Agent will forthwith so notify the
     Borrower and the Lenders, whereupon each such Eurodollar Rate Advance will
     automatically, on the last day of the then existing Interest Period
     therefor, Convert into a Base Rate Advance.

          (iii)  Upon the occurrence and during the continuance of any Event of
     Default and upon notice from the Administrative Agent to the Borrower at
     the request of the Required Lenders, (x) each Eurodollar Rate Advance will
     automatically, on the last day of the then existing Interest Period
     therefor, Convert into a Base Rate Advance and (y) the obligation of the
     Lenders to make, or to Convert Advances into, or to Continue, Eurodollar
     Rate Advances shall be suspended.

          (c)  Continuations.  The Borrower may, on any Business Day, upon
               -------------
notice given to the Administrative Agent not later than 10:00 A.M. (New York
City time) on the second Business Day prior to the date of the proposed
Continuation and subject to the provisions of Sections 2.08, Continue all or any
portion of the outstanding Eurodollar Rate Advances having the same Interest
Period as such Eurodollar Rate Advances; provided that any such Continuation
                                         --------
shall be made only on the last day of an Interest Period for such Eurodollar
Rate Advances, any Continuation of Eurodollar Rate Advances shall be in an
amount not less than $3,000,000 or an integral multiple of $1,000,000 in excess
thereof and no Continuation of any Advances shall result in more than 8 separate
Interest Periods being outstanding.  Each such notice of Continuation shall,
within the restrictions specified above, specify (i) the date of such
Continuation, (ii) the aggregate amount of, and the Interest Period for, the
Advances being Continued and (iii) the duration of the initial Interest Period
for the Eurodollar Rate Advances subject to such Continuation.  Each notice of
Continuation shall be irrevocable and binding on the Borrower.

          Section 2.08.  Increased Costs, Illegality, Etc.
                         ---------------------------------

          (a)  If, due to either (i) the introduction of or any change in or in
the interpretation of (to the extent any such introduction or change occurs
after the date hereof) any law or regulation or (ii) the compliance with any
guideline or request from any central bank or other governmental authority
adopted or made after the date hereof (whether or not having the force of law),
there shall be any increase in the cost to any Lender of agreeing to make or
making, funding or maintaining Eurodollar Rate Advances, then the Borrower shall
from time to time, upon demand by such Lender (with a copy of such demand to the
Administrative Agent), pay to the Administrative Agent for the account of such
Lender additional amounts sufficient to compensate such Lender for such
increased cost; provided that, before making any such demand, each Lender agrees
                --------
to use reasonable efforts (consistent with its internal policy and legal and
regulatory restrictions) to designate a different Applicable Lending Office if
the making of such a designation would avoid the need for, or reduce the amount
of, such increased cost and would not, in the reasonable judgment of such
Lender, be otherwise disadvantageous to such Lender.  A certificate as to the
amount of such increased cost, submitted to the Borrower by such Lender, shall
be conclusive and binding for all purposes, absent manifest error.
<PAGE>

                                      -37-

          (b)  If any Lender determines in good faith that compliance with any
law or regulation enacted or introduced after the date hereof or any guideline
or request from any central bank or other governmental authority adopted or made
after the date hereof (whether or not having the force of law) affects or would
affect the amount of capital required or expected to be maintained by such
Lender or any corporation controlling such Lender and that the amount of such
capital is increased by or based upon the existence of such Lender's commitment
to lend hereunder and other commitments of this type, then, upon demand by such
Lender (with a copy of such demand to the Administrative Agent), the Borrower
shall pay to the Administrative Agent for the account of such Lender, from time
to time as specified by such Lender, additional amounts sufficient to compensate
such Lender in the light of such circumstances, to the extent that such Lender
reasonably determines such increase in capital to be allocable to the existence
of such Lender's commitment to lend hereunder.  A certificate as to such amounts
submitted to the Borrower by such Lender, shall be conclusive and binding for
all purposes, absent manifest error.

          (c)  If, with respect to any Eurodollar Rate Advances, (i) the
Required Lenders reasonably determine and notify the Administrative Agent that
the Eurodollar Rate for any Interest Period for such Advances will not
adequately reflect the cost to such Required Lenders of making, funding or
maintaining their respective Eurodollar Rate Advances for such Interest Period,
or (ii) if fewer than two Reference Banks furnish timely information to the
Administrative Agent for determining the Eurodollar Rate for any Eurodollar Rate
Advances, the Administrative Agent shall forthwith so notify the Borrower and
the Lenders, whereupon (x) each Eurodollar Rate Advance will automatically, on
the last day of any then existing Interest Period therefor, Convert to a Base
Rate Advance, and (y) the obligation of the Lenders to make, or to Convert
Advances into, or to Continue, Eurodollar Rate Advances shall be suspended until
the Administrative Agent shall notify the Borrower and such Lenders that the
circumstances causing such suspension no longer exist.

          (d)  Notwithstanding any other provision of this Agreement, if the
introduction of or any change in or in the interpretation of (to the extent any
such introduction or change occurs after the date hereof) any law or regulation
shall make it unlawful, or any central bank or other governmental authority
having appropriate jurisdiction shall assert in writing that it is unlawful, for
any Lender or its Eurodollar Lending Office to perform its obligations hereunder
to make Eurodollar Rate Advances or to continue to fund or maintain Eurodollar
Rate Advances hereunder, then, on notice thereof and demand therefor by such
Lender to the Borrower through the Administrative Agent, (i) each Eurodollar
Rate Advance of such Lender will automatically, upon such demand, Convert to a
Base Rate Advance and (ii) the obligation of such Lender to make, or to Convert
Advances into, or to Continue, Eurodollar Rate Advances shall be suspended until
the Administrative Agent shall notify the Borrower that such Lender has
determined that the circumstances causing such suspension no longer exist;
provided that, before making any such demand, such Lender agrees to use
- --------
reasonable efforts (consistent with its internal policy and legal and regulatory
restrictions) to designate a different Eurodollar Lending Office if the making
of such a designation would allow such Lender or its Eurodollar Lending
<PAGE>

                                      -38-

Office to continue to perform its obligations to make Eurodollar Rate Advances
or to continue to fund or maintain Eurodollar Rate Advances and would not, in
the judgment of such Lender, be otherwise disadvantageous to such Lender.

          (e)  The Borrower shall not be obligated to pay any additional amounts
arising pursuant to clauses (a) and (b) of this Section 2.08 that are
attributable to the Excluded Period with respect to such additional amount;
provided that if an applicable law, rule, regulation, guideline or request shall
- --------
be adopted or made on any date and shall be applicable to the period (a
"Retroactive Period") prior to the date on which such law, rule, regulation,
 ------------------
guideline or request is adopted or made, the limitation on the Borrower's
obligations to pay such additional amounts hereunder shall not apply to the
additional amounts payable in respect of such Retroactive Period.

          Section 2.09.  Payments and Computations.
                         -------------------------

          (a)  The Borrower shall make each payment hereunder and under the
Notes not later than 12:00 Noon (New York City time) on the day when due in U.S.
Dollars to the Administrative Agent at the Administrative Agent's Account in
same day funds and, except as expressly set forth herein, without deduction,
set-off or counterclaim.  The Administrative Agent will promptly thereafter
cause to be distributed like funds relating to the payment of principal or
interest hereunder ratably (other than amounts payable pursuant to Section
2.08(a), 2.08(b), 2.10 or 9.04(c)) to the Lenders for the account of their
Applicable Lending Offices, and like funds relating to the payment of any other
amount payable to any Lender to such Lender for the account of its Applicable
Lending Office, in each case to be applied in accordance with the terms of this
Agreement.  Upon its acceptance of an Assignment and Acceptance and recording of
the information contained therein in the Register pursuant to Section 9.07(d),
from and after the effective date of such Assignment and Acceptance, the
Administrative Agent shall make all payments hereunder and under the Notes in
respect of the interest assigned thereby to the Lender assignee thereunder, and
the parties to such Assignment and Acceptance shall make all appropriate
adjustments in such payments for periods prior to such effective date directly
between themselves.

          (b)  If the Administrative Agent receives funds for application to the
Obligations under the Basic Documents under circumstances for which the Basic
Documents do not specify the Advances to which, or the manner in which, such
funds are to be applied, and the Borrower has not otherwise directed how such
funds are to be applied (which direction is consistent with the terms of the
Basic Documents), the Administrative Agent may, but shall not be obligated to,
elect to distribute such funds to each Lender ratably in accordance with such
Lender's proportionate share of the principal amount of all outstanding
Advances, in repayment or prepayment of such of the outstanding Advances or
other Obligations owed to such Lender, and for application to such principal
installments, as the Administrative Agent shall direct.

          (c)  The Borrower hereby authorizes each Lender, if and to the extent
payment owed to such Lender is not made when due hereunder or under any Note
held by such Lender, to
<PAGE>

                                      -39-

charge from time to time against any or all of the Borrower's accounts with such
Lender any amount so due (with notice to the Administrative Agent and the
Borrower promptly following such charge).

          (d)  Each Reference Bank party hereto agrees to furnish to the
Administrative Agent timely information for the purpose of determining each
Eurodollar Rate.  If any one or more of the Reference Banks shall not furnish
such timely information to the Administrative Agent for the purpose of
determining any such interest rate, the Administrative Agent shall determine
such interest rate on the basis of timely information furnished by the remaining
Reference Banks.

          (e)  All computations of interest shall be made by the Administrative
Agent on the basis of a year of 360 days, in each case for the actual number of
days (including the first day but excluding the last day) occurring in the
period for which such interest, fees or commissions are payable.  Each
determination by the Administrative Agent of an interest rate hereunder made in
accordance with the provisions of this Agreement shall be conclusive and binding
for all purposes, absent manifest error.

          For purposes of the Interest Act (Canada) and disclosure thereunder,
whenever interest or any fee to be paid hereunder or in connection herewith is
to be calculated on the basis of any period of time that is less than a calendar
year, the yearly rate of interest to which the rate determined pursuant to such
calculation is equivalent is the rate so determined multiplied by the actual
                                                    ---------- --
number of days in the calendar year in which the same is to be ascertained and
divided by the number of days in such period of time.  The rates of interest
- ------- --
under this Agreement are nominal rates, and not effective rates or yields.  The
principle of deemed reinvestment of interest does not apply to any interest
calculation under this Agreement.

          (f)  Whenever any payment hereunder or under the Notes shall be stated
to be due on a day other than a Business Day, such payment shall be made on the
next succeeding Business Day, and such extension of time shall in such case be
included in the computation of payment of interest; provided that, if such
                                                    --------
extension would cause payment of interest on or principal of Eurodollar Rate
Advances to be made in the next following calendar month, such payment shall be
made on the immediately preceding Business Day.

          (g)  Unless the Administrative Agent shall have received notice from
the Borrower prior to the date on which any payment is due to any Lender
hereunder that the Borrower will not make such payment in full, the
Administrative Agent may assume that the Borrower has made such payment in full
to the Administrative Agent on such date and the Administrative Agent may, in
reliance upon such assumption, cause to be distributed to each such Lender on
such due date an amount equal to the amount then due such Lender.  If and to the
extent the Borrower shall not have so made such payment in full to the
Administrative Agent, each such Lender shall repay to the Administrative Agent
forthwith on demand such amount distributed to such Lender together with
interest thereon, for each day from the date such amount
<PAGE>

                                      -40-

is distributed to such Lender until the date such Lender repays such amount to
the Administrative Agent, at the Federal Funds Rate.

          Section 2.10.  Taxes.
                         -----

          (a)  Any and all payments by the Obligors on or in respect of this
Agreement, the Advances, the Notes, the Security Documents, the recording,
registration, notarization or other formalization of any thereof, the
enforcement thereof or the introduction thereof in any judicial proceedings, or
on or in respect of any payments of principal, interest, premium, charges, fees
or other amounts made on, under or in respect of any thereof, shall be made, in
accordance with Section 2.09, free and clear of and without deduction or
withholding for any and all present and future income, stamp, registration and
other taxes and levies, imposts, deductions, charges, compulsory loans and
withholdings whatsoever, now or hereafter imposed, assessed, levied or collected
by any authority of or in any jurisdiction (including, without limitation,
Canada or any political subdivision or taxing authority thereof or therein, or
any federal or other association of or with which Canada may be a member or
associated and specifically including any withholding made pursuant to Part XIII
of the Income Tax Act (Canada) in respect of any interest payment hereunder),
excluding, in the case of each Lender, income or franchise taxes imposed on such
- ---------
Lender that are imposed on it by the state or foreign jurisdiction of such
Lender's Applicable Lending Office or any political subdivision thereof (all
such non-excluded taxes, levies, imposts, deductions, charges, withholdings and
liabilities being hereinafter referred to as "Taxes").  If any Obligor shall be
                                              -----
required by law to deduct or withhold any Taxes from or in respect of any sum
payable hereunder or under any Note to any  Lender or the Administrative Agent,
(i) the sum payable shall be increased as may be necessary so that after making
all required deductions or witholdings (including deductions applicable to
additional sums payable under this Section 2.10) such Lender or the
Administrative Agent (as the case may be) receives an amount equal to the sum it
would have received had no such deductions or witholdings been made, (ii) such
Obligor shall make such deductions or witholdings and (iii) such Obligor shall
pay the full amount deducted or withheld to the relevant taxation authority or
other authority in accordance with applicable law.

          (b)  In addition, each Obligor agrees to pay any present or future
stamp or documentary taxes or any other excise or property taxes, charges or
similar levies that arise from any payment made by it hereunder or under the
Notes or from the execution, delivery or registration of this Agreement or the
Notes (hereinafter referred to as "Other Taxes").
                                   -----------

          (c)  Each Obligor will indemnify each Lender and the Administrative
Agent for the full amount of Taxes or Other Taxes (including, without
limitation, any Taxes or Other Taxes imposed by any jurisdiction on amounts
payable under this Section 2.10) paid by such Lender or the Administrative Agent
(as the case may be) and any liability (including penalties, additions to tax,
interest and expenses) arising therefrom or with respect thereto.  This
indemnification shall be made within 30 days from such date such Lender or the
Administrative Agent (as the case may be) makes written demand therefor.
<PAGE>

                                      -41-

          (d)  Within 30 days after the date of any payment of Taxes, each
Obligor will furnish to the Administrative Agent, at its address referred to in
Section 9.02, appropriate evidence of payment thereof.  If such Obligor shall
make a payment hereunder or under the Notes through an account or branch outside
the United States, or a payment is made on behalf of such Obligor by a payor
that is not a United States Person, such Obligor will, if no taxes are payable
in respect of such payment, furnish, or will cause such payor to furnish, to the
Administrative Agent, at such address, a certificate from the appropriate taxing
authority or authorities, or an opinion of counsel acceptable to the
Administrative Agent, in either case stating that such payment is exempt from or
not subject to Taxes.  For purposes of this subsection (d), the terms "United
                                                                       ------
States" and "United States Person" shall have the meanings specified in Section
- ------       --------------------
7701 of the Internal Revenue Code.

          (e)  Any Lender claiming any additional amounts payable pursuant to
this Section 2.10 shall use reasonable efforts (consistent with its internal
policy and legal and regulatory restrictions) to change the jurisdiction of its
Applicable Lending Office(s) if the making of such a change would avoid the need
for, or reduce the amount of, any such additional amounts that may thereafter
accrue and would not, in the reasonable judgment of such Lender, be otherwise
disadvantageous to such Lender.

          (f)  Without prejudice to the survival of any other agreement of the
Borrower hereunder, the agreements and obligations of the Borrower contained in
this Section 2.10 shall survive the payment in full of principal and interest
hereunder and under the Notes.

          (g)  The Borrower represents and warrants that, as of the date hereof,
to the best of its knowledge after due inquiry, (i) neither this Agreement nor
the execution or delivery by the Borrower of this Agreement is subject to any
Taxes, and (ii) no payment to be made by the Borrower hereunder or under any
Note is subject to any Taxes.

          Section 2.11.  Sharing of Payments, Etc. If any Lender shall obtain
                         -------------------------
any payment (whether voluntary, involuntary, through the exercise of any right
of set-off, or otherwise) on account of the Advances owing to it (other than
pursuant to Section 2.08(a), 2.08(b), 2.10 or 9.04(c)) in excess of its ratable
share of payments on account of the Advances obtained by all the Lenders, such
Lender shall forthwith purchase from the other Lenders such participations in
the Advances owing to them as shall be necessary to cause such purchasing Lender
to share the excess payment ratably with each of them; provided that if all or
                                                       --------
any portion of such excess payment is thereafter recovered from such purchasing
Lender, such purchase from each Lender shall be rescinded and such Lender shall
repay to the purchasing Lender the purchase price to the extent of such recovery
together with an amount equal to such Lender's ratable share (according to the
proportion of (i) the amount of such Lender's required repayment to (ii) the
total amount so recovered from the purchasing Lender) of any interest or other
amount paid or payable by the purchasing Lender in respect of the total amount
so recovered. The Borrower agrees that any Lender so purchasing a participation
from another Lender pursuant to this Section 2.11 may, to the fullest extent
permitted by law, exercise all its rights of payment (including the right of
<PAGE>

                                      -42-

set-off) with respect to such participation as fully as if such Lender were the
direct creditor of the Borrower in the amount of such participation.

          Section 2.12.  Criminal Rate of Interest. Notwithstanding any other
                         -------------------------
provisions of this Agreement, in no event shall the aggregate "interest" (as
defined in Section 347 ("Section 347") of the Criminal Code, Revised Statutes of
                         -----------
Canada, 1985, C-46, as the same shall be amended, replaced or re-enacted from
time to time) payable to the Lenders under this Agreement exceed the effective
annual rate of interest on the "credit advances" (as defined in Section 347)
hereunder lawfully permitted under Section 347 and, if any payment, collection
or demand pursuant to this Agreement in respect of "interest" (as defined in
Section 347) is determined to be contrary to the provisions of Section 347, such
payment, collection or demand shall be deemed to have been made by mutual
mistake of the Lenders and the Borrower and the amount of such payment or
collection shall be refunded by the Lenders to the Borrowers. For the purposes
of this Agreement, the effective annual rate of interest shall be determined in
accordance with generally accepted actuarial practices and principles over the
term of the Advances on the basis of annual compounding for the lawfully
permitted rate of interest and, in the event of dispute, a certificate of a
Fellow of the Canadian Institute of Actuaries appointed by the Administrative
Agent for the account of the Borrower will be conclusive for the purpose of such
determination in the absence of evidence to the contrary.

          Section 2.13.  Replacement of Lenders.
                         ----------------------

          (a)  Subject to clause (b) below, in the event that any Lender
requests compensation pursuant to Section 2.08(a) or 2.08(b), or the obligation
of any Lender to make, or to Convert Base Rate Advances into, or to Continue,
Eurodollar Rate Advances shall be suspended pursuant to Section 2.08(c) or
2.08(d) (such Lender being herein called an "Affected Lender"), then, so long as
                                             ---------------
such condition exists, the Borrower may, after the date 30 days after the date
of such request or suspension, (x) designate an Eligible Assignee acceptable to
the Administrative Agent (which acceptance will not be unreasonably withheld)
that is not an Affiliate of the Borrower (such Eligible Assignee being herein
called a "Replacement Lender") to purchase the Affected Lender's Advances and
          ------------------
other rights under the Loan Documents (all without recourse to or representation
or warranty by, or expense to, the Affected Lender) for a purchase price equal
to the aggregate principal amount of the outstanding Advances held by the
Affected Lender plus all accrued but unpaid interest on such Advances owing to
                ----
the Affected Lender (and upon such purchase and substitution, and subject to the
execution and delivery to the Administrative Agent by the Replacement Lender of
documentation satisfactory to the Administrative Agent and compliance with the
requirements of Section 9.07(c), the Replacement Lender shall succeed to the
rights and obligations of the Affected Lender hereunder and the other Loan
Documents), and (y) pay to the Affected Lender all amounts payable to such
Affected Lender under Section 9.04(c), calculated as if the purchase by the
Replacement Lender constituted a mandatory prepayment of Advances by the
Borrower, and (z) pay to the Administrative Agent the processing and recordation
fee specified in Section 9.07(a)(vi) with respect to such assignment.
<PAGE>

                                      -43-

          In the event that the Borrower exercises its rights under the
preceding sentence, the Affected Lender shall no longer be a party hereto or
have any rights or obligations hereunder or under the other Loan Documents;
provided that the obligations of the Borrower to the Affected Lender under
- --------
Sections 2.08, 2.10 and 9.04 with respect to events occurring or obligations
arising before or as a result of such replacement shall survive such exercise.

          (b)  The Borrower may not exercise its rights under this Section 2.13:

          (i)  with respect to any Affected Lender unless the Borrower
     simultaneously exercises such rights with respect to all Affected Lenders,
     or

          (ii) if a Default or an Event of Default has occurred and is then
     continuing.


                                  ARTICLE III

                           CONDITIONS TO RESTATEMENT

          Section 3.01.  Conditions Precedent. The Existing Credit Agreement
                         --------------------
shall be amended and restated to read in full as set forth herein on the date
(the "Restatement Date") on which the Administrative Agent shall notify the
      ----------------
Borrower that the Administrative Agent shall have received the following in form
and substance satisfactory to it:

          (a)  This Agreement, duly executed and delivered by each Obligor, the
     Required Lenders and the Administrative Agent.

          (b)  The Notes, duly executed by the Borrower.

          (c)  The following documents, each dated the Restatement Date (unless
     otherwise specified), in form and substance satisfactory to the
     Administrative Agent (unless otherwise specified) and in sufficient copies
     for the Administrative Agent and each Lender:

               (i)  (1) for the Borrower, a copy of its charter (or equivalent
          documents), as amended and in effect, certified by the appropriate
          Canadian governmental authority, and a certificate from the Ontario
          Ministry of Consumer and Commercial Relations to the effect that the
          Borrower is a corporation incorporated under the Business Corporations
          Act (Ontario) and has not been dissolved; (2) for the Subsidiary
          Guarantor, a copy of its memorandum and articles of association, as
          amended and in effect, certified by a duly authorized officer of the
          Subsidiary Guarantor; and (3) for each other Obligor, a copy of the
          charter, as amended and in effect, of such Obligor certified (as of a
          date reasonably close to the Restatement Date) by the Secretary of
          State of the jurisdiction of its organization and a certificate from
          such Secretary of State dated
<PAGE>

                                      -44-

          as of a date reasonably close to the Restatement Date as to the good
          standing of and charter documents filed by such Obligor;

               (ii)  for each Obligor, a certificate of the Secretary or an
          Assistant Secretary of such Obligor, dated the Restatement Date and
          certifying (A) that attached thereto is a true and complete copy of
          the by-laws (or equivalent documents) of such Obligor as amended and
          in effect at all times from the date on which the resolutions referred
          to in clause (B) were adopted to and including the date of such
          certificate, (B) that attached thereto is a true and complete copy of
          resolutions duly adopted by the board of directors of such Obligor
          authorizing the execution, delivery and performance of such of the
          Loan Documents to which such Obligor is or is intended to be a party
          and the extensions of credit hereunder, and that such resolutions have
          not been modified, rescinded or amended and are in full force and
          effect, (C) that the charter of such Obligor has not been amended
          since the date of the certification thereto furnished pursuant to
          clause (i) above, and (D) as to the incumbency and specimen signature
          of each officer of such Obligor executing such of the Loan Documents
          to which such Obligor is intended to be a party and each other
          document to be delivered by such Obligor from time to time in
          connection therewith (and the Administrative Agent and each Lender may
          conclusively rely on such certificate until it receives notice in
          writing from such Obligor);

               (iii) for each Obligor, a certificate of another officer of such
          Obligor, dated the Restatement Date, as to the incumbency and specimen
          signature of the Secretary or Assistant Secretary, as the case may be,
          of such Obligor.

          (d) (X) The Holdings Pledge Agreement, the Terra Capital Pledge and
     Security Agreement, the Subsidiary Pledge and Security Agreement and the
     TNLP Pledge and Security Agreement, in substantially the forms of Exhibits
     B-1, B-2, B-3 and B-4, respectively, duly executed by each of the intended
     parties thereto, together with:

               (i)  such appropriately completed and duly executed copies of
          Uniform Commercial Code financing statements and financing statement
          amendments as the Collateral Agent or any Secured Party (as defined in
          the Intercreditor Agreement) shall have requested in order to continue
          the perfection and protection of the Liens created by the Terra
          Capital Security Documents and covering the Collateral described
          therein;

               (ii)  executed and delivered documents for recordation and filing
          of or with respect to such Security Documents that the Collateral
          Agent or any such Secured Party may deem necessary or desirable in
          order to continue the perfection and protection of the Liens created
          thereby; and
<PAGE>

                                      -45-

               (iii)  legal opinions, in form and substance, and given by
          counsel, satisfactory to the Administrative Agent, confirming that the
          Terra Capital Security Documents are legal, valid, binding and
          enforceable obligations of each Obligor party thereto and that the
          security interests created thereby are a valid first and prior
          perfected security interest in the Collateral.

          (Y) (i) legal opinions, in form and substance, and given by counsel,
     satisfactory to the Administrative Agent, confirming that the Terra Canada
     Security Documents are legal, valid, binding and enforceable obligations of
     each Obligor party thereto, that the security interests created thereby are
     a valid and perfected security interest in the Collateral, and addressing
     such other matters as the Administrative Agent or any Lender through the
     Administrative Agent may reasonably request and (ii) all relevant
     certificates evidencing the entitlement to the shares of common and
     preferred stock of Terra U.K. (together with executed stock transfer forms
     and undated stock powers duly executed in blank).

          (e)  such appropriately completed and duly executed copies of all
     registrations, recordings and other filings (or undertakings to register),
     together with any searches of filings related thereto, as the
     Administrative Agent or any Lender shall have requested in order to
     continue the perfection and protection of the Liens created by the Terra
     Canada Security Documents and covering the Collateral described therein;
     and such executed and delivered documents for recordation and filing of or
     with respect to such Terra Canada Security Documents that the
     Administrative Agent or any Lender (through the Administrative Agent) may
     deem necessary or desirable in order to continue the perfection and
     protection of the Liens created thereby.

          (f)  A Confirmation of Loan Purchase Agreement in substantially the
     form of Exhibit E, duly executed and delivered by Terra and the
     Administrative Agent.

          (g)  A favorable opinion of Kirkland & Ellis, special counsel for the
     Obligors, substantially in the form of Exhibit D-1, and a favorable opinion
     of Osler, Hoskin & Harcourt, special Canadian counsel for the Borrower,
     substantially in the form of Exhibit D-2, and each as to such other matters
     as the Administrative Agent or any Lender through the Administrative Agent
     may reasonably request.

          (h)  A favorable opinion of Milbank, Tweed, Hadley & McCloy LLP,
     special New York counsel for Citibank, substantially in the form of Exhibit
     D-3, and a favorable opinion of Blake, Cassels & Graydon, special Canadian
     counsel for Citibank, substantially in the form of Exhibit D-4.

          (i)  A certificate of the Senior Financial Officer to the effect that:

               (x)  the representations and warranties contained in each Loan
          Document are correct on and as of the Restatement Date, before and
          after giving effect to the
<PAGE>

                                      -46-


          amendment and restatement provided for hereby, as though made on and
          as of such date (or, if any such representation or warranty is
          expressly stated to have been made as of a specific date, as of such
          specific date); and

                (y)  no event has occurred and is continuing that constitutes a
          Default or an Event of Default.

          (j)  Evidence of payment of (1) all accrued fees and expenses of the
     Administrative Agent (including the reasonable and documented fees and
     expenses of counsel to Citibank in connection with this Agreement to the
     extent that statements for such fees and expenses have been delivered to
     the Borrower at least one Business Day prior to the Restatement Date); and
     (2) all interest accrued through the Restatement Date on the Existing
     Advances and all other expenses payable under the Existing Credit
     Agreement.

          (k)  Evidence of the existence of all insurance required to be
     maintained by Terra hereunder and the designation of the Borrower as the
     loss payee or named insured with respect to the Collateral under the Terra
     Canada Security Documents as its interest may appear.

          (l)  Evidence that, since December 31, 1998, there has been no
     Material Adverse Change.

          (m)  The New York Process Agent Acceptance, duly executed and
     delivered by the New York Process Agent.

          (n)  Evidence that the amendment and restatement provided for by the
     Terra Capital Credit Facility has occurred (or is occurring on the
     Restatement Date).

          (o)  Evidence that the transactions contemplated in the Distribution
     Business Sale Agreement to be consummated on the "Closing Date" (as defined
     therein) have been consummated or are being consummated on the Restatement
     Date, without waiver by Terra in any material respect unless such waiver is
     consented to by the Administrative Agent and the Required Lenders.

          (p)  Evidence that Terra or one or more of its Subsidiaries shall have
     purchased Receivables theretofore sold (by Terra and/or its Subsidiaries)
     under one or more of the Receivables Facilities for an aggregate amount not
     exceeding $150,000,000 and that the Receivables Facilities shall have been
     cancelled in a manner satisfactory to the Administrative Agent.

          (q)  Evidence that Terra or one or more of its Subsidiaries shall have
     purchased the BMLP Class A Limited Partnership Interest from the existing
     BMLP Class A Limited Partner for an amount estimated to be $227,000,000
     (such amount as determined in

<PAGE>

                                      -47-

     compliance with the BMLP Partnership Agreement, the BMLP Support and Option
     Agreement and related documents).

          (r)  Evidence that (i) the BMLP Support and Option Agreement and the
     Terra U.K. Offtake Agreement have been cancelled (in the case of the Terra
     U.K. Offtake Agreement with no amounts being paid by Terra and/or any of
     its Subsidiaries in connection therewith (including, without limitation,
     amounts paid subsequent to the Restatement Date)) and (ii) the outstanding
     principal amount of the "Terra Capital Note" as defined in the Existing
     Credit Agreement shall have been paid in full or otherwise cancelled.

          (s)  The following documents, each of which shall be executed (and,
     where appropriate, acknowledged) by Persons satisfactory to the
     Administrative Agent:

                 (i)  The Terra Oklahoma Mortgage, the BMLP Mortgage and the
          Port Neal Corporation Mortgage, each in substantially the forms of
          Exhibits B-7, duly executed by each of the intended parties thereto,
          covering the facilities of the Company and its Subsidiaries located in
          Woodward, Oklahoma, Port Neal, Iowa and Beaumont, Texas, in each case
          duly executed and delivered by the intended parties thereto in
          recordable form (in such number of copies as the Administrative Agent
          shall have requested) and, to the extent necessary with respect to any
          leasehold property to be subjected to a Mortgage, consents of the
          respective landlords with respect to such property; and

                 (ii) to the extent necessary under applicable law, for filing
          in the appropriate county land office, Uniform Commercial Code
          financing statements covering fixtures, appropriately completed and
          duly executed.

          (t)  Such other approvals, opinions and documents relating to this
     Agreement and the transactions contemplated hereby as any Lender may,
     through the Administrative Agent, reasonably request.

          Section 3.02.  Conditions Precedent to Section 2.01(a) Assignments.
                         ---------------------------------------------------
The obligation of each Lender to effect the assignments of the Advances referred
to in Section 2.01 on the Restatement Date shall be subject to the further
conditions precedent that on the Restatement Date the following statements shall
be true:

          (i)  the representations and warranties contained in each Loan
     Document are correct on and as of the Restatement Date, before and after
     giving effect to the amendment and restatement of the Existing Credit
     Agreement provided for hereby, as though made on and as of such date (or,
     if any such representation or warranty is expressly stated to have been
     made as of a specific date, as of such specific date); and
<PAGE>

                                      -48-

          (ii)  no event has occurred and is continuing, or would result from
     the transactions contemplated hereby to occur on the Restatement Date, that
     constitutes a Default or an Event of Default.

          Section 3.03.  Determinations Under Section 3.01. For purposes of
                         ---------------------------------
determining compliance with the conditions specified in Section 3.01, each
Lender shall be deemed to have consented to, approved or accepted or to be
satisfied with each document or other matter required thereunder to be consented
to or approved by or acceptable or satisfactory to the Lenders unless an officer
of the Administrative Agent responsible for the transactions contemplated by the
Loan Documents shall have received notice from such Lender prior to the
Restatement Date specifying its objection thereto and such Lender shall not have
made available to the Administrative Agent such Lender's purchase price of the
Advances to be acquired by it pursuant to Section 2.01(a).

          Section 3.04.  Consent to Sale; Acknowledgement. Effective as of the
                         --------------------------------
Restatement Date, the Initial Lenders hereby consent to the sale by Terra of the
Distribution Business on the terms and conditions as set forth in the
Distribution Business Sale Agreement.

          Section 3.05.  Terra Canada Consent. The Borrower hereby acknowledges
                         --------------------
that each of the Terra Canada Security Documents continues unchanged and remains
in full force and effect to secure (as "Liabilities" as defined therein) the
obligations of the Borrower hereunder.

                                  ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES

          Section 4.01.  Representations and Warranties of the Borrower. The
                         ----------------------------------------------
Borrower represents and warrants as follows:

          (a)  Each Obligor (i) is a corporation (or, in the cases of TNLP and
     BMLP, a limited partnership) duly organized, validly existing and in good
     standing under the laws of the jurisdiction of its organization, (ii) is
     duly qualified and in good standing as a foreign corporation (or limited
     partnership, as the case may be) in each other jurisdiction in which it
     owns or leases property or in which the conduct of its business requires it
     to so qualify or be licensed and where, in each case, failure so to qualify
     and be in good standing could reasonably be expected to have a Material
     Adverse Effect and (iii) has all requisite power (corporate or other) and
     authority to own or lease and operate its properties and to carry on its
     business as now conducted and as proposed to be conducted.

          (b)  Set forth on Schedule 4.01(b) is a complete and accurate list of
     all Material Subsidiaries of each Obligor as of the Restatement Date,
     showing as of such date (as to each such Subsidiary) the jurisdiction of
     its organization, the number of shares of each class of capital stock or
     partnership interests authorized, and the number outstanding and
<PAGE>

                                      -49-

     the percentage of the outstanding shares or interests of each such class
     owned (directly or indirectly) by such Obligor and the number of shares
     covered by all outstanding options, warrants, rights of conversion or
     purchase and similar rights. All of the outstanding capital stock or
     partnership interests of all of such Subsidiaries has been validly issued,
     is fully paid and non-assessable and is owned by such Obligor or one or
     more of its Subsidiaries free and clear of all Liens, except those created
     by the Security Documents. Each Material Subsidiary (i) is a corporation
     (or, in the cases of TNLP and BMLP, a limited partnership) duly organized,
     validly existing and in good standing under the laws of the jurisdiction of
     its organization, (ii) is duly qualified and in good standing as a foreign
     corporation or limited partnership, as the case may be, in each other
     jurisdiction in which it owns or leases property or in which the conduct of
     its business requires it to so qualify or be licensed and where, in each
     case, failure to so qualify and be in good standing could reasonably be
     expected to have a Material Adverse Effect and (iii) has all requisite
     power (corporate or other) and authority to own or lease and operate its
     properties and to carry on its business as now conducted and as proposed to
     be conducted.

          (c)  The execution, delivery and performance by each Obligor of this
     Agreement, the Notes and each other Loan Document to which it is or is
     intended to be a party, and the consummation of the credit transactions
     between the Borrower and Lenders contemplated hereby, are within such
     Obligor's powers (corporate or other), have been (or will, prior to the
     Restatement Date, be) duly authorized by all necessary corporate or other
     action, and do not (i) contravene such Obligor's charter, by-laws or, in
     the cases of TNLP and BMLP, its agreement of limited partnership, (ii)
     violate any applicable law (including, without limitation, the Securities
     Exchange Act of 1934 and the Racketeer Influenced and Corrupt Organizations
     Chapter of the Organized Crime Control Act of 1970), rule, regulation
     (including, without limitation, Regulation U and Regulation X), order,
     writ, judgment, injunction, decree, determination or award (except for any
     such violation, by action or inaction of any Obligor, that could not
     reasonably be expected to have a Material Adverse Effect and that could not
     result in any liability of any Lender), (iii) except as set forth on
     Schedule 4.01(c), conflict with or result in the breach of, or constitute a
     default under, any contract, loan agreement, indenture, mortgage, deed of
     trust, lease or other instrument binding on or affecting any Obligor, any
     of its Subsidiaries or any of their properties (except for any such
     conflict, breach or default, caused by action or inaction of any Obligor,
     that could not reasonably be expected to have a Material Adverse Effect and
     that could not result in any liability of any Lender) or (iv) except for
     the Liens created by the Security Documents, result in or require the
     creation or imposition of any Lien upon or with respect to any of the
     properties of any Obligor or any of its Subsidiaries. No Obligor or any of
     its Subsidiaries is in violation of any such law, rule, regulation, order,
     writ, judgment, injunction, decree, determination or award or in breach of
     any such contract, loan agreement, indenture, mortgage, deed of trust,
     lease or other instrument, the violation or breach of which could be
     reasonably expected to have a Material Adverse Effect.
<PAGE>

                                      -50-

          (d)  No authorization or approval or other action by, and no notice to
     or filing with, any governmental authority or regulatory body or any other
     third party is required for (i) the due execution, delivery, recordation,
     filing or performance by any Obligor of this Agreement, the Notes or any
     other Loan Document to which it is or is to be a party, or for the
     consummation of the credit transactions between Borrower and Lenders
     contemplated hereby, (ii) the grant by any Obligor of the Liens granted by
     it pursuant to the Security Documents, (iii) the perfection or maintenance
     of the Liens created by the Security Documents (except for the filings
     required to be made pursuant to Sections 3.01(c) and 3.01(e)) or (iv) the
     exercise by the Collateral Agent, the Administrative Agent or any Lender or
     any other Secured Party (as defined in the Security Documents) of its
     rights under the Loan Documents or the remedies in respect of the
     Collateral pursuant to the Security Documents, except for the
     authorizations, approvals, actions, notices and filings listed on Schedule
     4.01(d), all of which have been duly obtained, taken, given or made and are
     in full force and effect.

          (e)  This Agreement has been, and each of the Notes and each other
     Loan Document when delivered will have been, duly executed and delivered by
     each Obligor that is intended to be a party thereto. This Agreement is, and
     each of the Notes and each other Loan Document when delivered will be, the
     legal, valid and binding obligation of each Obligor that is intended to be
     a party thereto, enforceable against such Obligor in accordance with its
     terms.

          (f)  The balance sheet of Terra as at December 31, 1998 and the
     related statements of income and cash flows of Terra for the twelve months
     then ended, accompanied by an opinion of Deloitte & Touche, independent
     public accountants, and the balance sheet of Terra as at March 31, 1999 and
     the related statements of income and cash flows of Terra for the three
     months then ended, duly certified by the chief financial officer of Terra,
     copies of which have been furnished to each Lender, present fairly, in all
     material respects, subject, in the case of said balance sheet as at March
     31, 1999, and said statements of income and cash flows for the three months
     then ended, to year-end audit adjustments, the financial condition of Terra
     as at such dates and the results of the operations of Terra for the periods
     ended on such dates, all in accordance with generally accepted accounting
     principles applied on a consistent basis. The unaudited balance sheet of
     the Borrower as at December 31, 1998 and the related unaudited statements
     of income and cash flows of the Borrower for the twelve months then ended,
     and the unaudited balance sheet of the Borrower as at March 31, 1999 and
     the related unaudited statements of income and cash flows of the Borrower
     for the three months then ended, duly certified by the chief financial or
     accounting officer of the Borrower, copies of which have been furnished to
     each Lender, present fairly, in all material respects, subject, in the case
     of said balance sheet as at March 31, 1999, and said statements of income
     and cash flows for the three months then ended, to year-end audit
     adjustments, the financial condition of the Borrower as at such dates and
     the results of the operations of the Borrower for the periods ended on such
     dates, all in accordance with generally accepted
<PAGE>

                                      -51-

     accounting principles applied on a consistent basis. Since December 31,
     1998, there has been no Material Adverse Change with respect to Terra.

          (g)  (A) No written information, exhibit or report (as at the
     Restatement Date) furnished by any officer of Terra or the Borrower to the
     Administrative Agent or any Lender in connection with the negotiation of
     the Loan Documents (when taken together) contained any untrue statement of
     a material fact or omitted to state a material fact necessary to make the
     statements made therein not misleading and (B) none of the information,
     exhibits or reports furnished by any Obligor to the Administrative Agent or
     any Lender pursuant to Section 5.03 contained (on the date of delivery
     thereof) any untrue statement of a material fact or omitted to state a
     material fact necessary to make the statements made therein not misleading;
     provided that the representations made in this Section 4.01(g) with respect
     --------
     to the U.K. Nitrogen Assets with respect to any time prior to the Closing
     Date are made to the best of Terra's knowledge after due inquiry.

          (h)  There is no action, suit, litigation or proceeding against any
     Obligor or any of its Subsidiaries or any of their respective property,
     including any Environmental Action, pending before any court, governmental
     agency or arbitrator, or (to the knowledge of any Obligor) threatened, nor
     (to the knowledge of any Obligor) is there any investigation pending in
     respect of any Obligor, that:

                (1)  could reasonably be expected to have a Material Adverse
          Effect; or

                (2)  on the Restatement Date could reasonably be expected to
          affect the legality, validity or enforceability of this Agreement, any
          Note, any other Loan Document or the consummation of the transactions
          contemplated hereby.

          (i)  No Obligor is engaged in the business of extending credit for the
     purpose of purchasing or carrying Margin Stock, and no proceeds of any
     Advance will be used for any purpose which violates the provisions of the
     regulations of the Board of Governors of the Federal Reserve System. After
     applying the proceeds of each Advance, not more than 25% of the value of
     the assets of the Borrower and of the Borrower and its Subsidiaries taken
     as a whole (as determined in good faith by the Borrower) that are subject
     to Section 5.02(a) or Section 5.02(e) will consist of or be represented by
     Margin Stock. If requested by any Lender or the Administrative Agent, the
     Borrower will furnish to the Administrative Agent and each Lender a
     statement in conformity with the requirements of Federal Reserve Form U-1
     referred to in Regulation U, the statements made in which shall be such, in
     the opinion of each Lender, as to permit the transactions contemplated
     hereby in accordance with Regulation U.

          (j)  Set forth on Schedule 4.01(j) is a complete and accurate list, as
     of the Restatement Date, of (1) each Plan that is subject to Title IV of
     ERISA and each Multiemployer Plan with respect to any employees or former
     employees of any Obligor or any of its ERISA Affiliates and (2) each
     Canadian Employee Benefit Plan.
<PAGE>

                                      -52-

          (k)  No ERISA Event has occurred or is reasonably expected to occur
     with respect to any Plan of any Obligor or any of its ERISA Affiliates that
     could reasonably be expected to have a Material Adverse Effect.

          (l)  Since the date of the Schedule B (Actuarial Information) to the
     most recent annual report (Form 5500 Series) for each Plan of any Obligor
     or any of its ERISA Affiliates, there has been no change in the funding
     status of any such Plan except to the extent that such change is not
     reasonably expected to have a Material Adverse Effect.

          (m)  Neither any Obligor nor any of its ERISA Affiliates has incurred
     or is reasonably expected to incur any withdrawal liability to any
     Multiemployer Plan except to the extent such withdrawal liability is not
     reasonably expected to have a Material Adverse Effect.

          (n)  Neither any Obligor nor any of its ERISA Affiliates has been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that such Multiemployer Plan is in reorganization or
     has been terminated, within the meaning of Title IV of ERISA.

          (o)  As of the Restatement Date, the aggregate annualized cost on a
     pay-as-you-go basis (including, without limitation, the cost of insurance
     premiums) with respect to post-retirement benefits under welfare plans
     (other than post-retirement benefits required to be provided by Section
     4980B of the Code or applicable state law) for which Terra and its
     Subsidiaries is liable does not exceed $1,000,000.

          (p)  Neither the business nor the properties of any Obligor or any of
     its Subsidiaries are affected by any fire, explosion, accident, strike,
     lockout or other labor dispute, drought, storm, hail, earthquake, embargo,
     act of God or of the public enemy or other casualty (whether or not covered
     by insurance) that could reasonably be expected to have a Material Adverse
     Effect.

          (q)  Except as set forth on Part I of Schedule 4.01(q) and except to
     the extent any of the following could not reasonably be expected to have a
     Material Adverse Effect, the operations and properties of each Obligor and
     each of its Subsidiaries comply in all material respects with all
     Environmental Laws, all necessary Environmental Permits have been obtained
     and are in effect for the operations and properties of each Obligor and its
     Subsidiaries, each Obligor and its Subsidiaries are in compliance in all
     material respects with all such Environmental Permits, and no circumstances
     exist that could (i) form the basis of an Environmental Action against any
     Obligor or any of its Subsidiaries or (ii) cause any such property to be
     subject to any material restrictions on ownership, occupancy, use or
     transferability under any Environmental Law.
<PAGE>

                                      -53-

          (r)  Except as set forth on Part II of Schedule 4.01(q) and except to
     the extent any of the following could not reasonably be expected to have a
     Material Adverse Effect, as of the Restatement Date none of the properties
     of any Obligor or any of its Subsidiaries is listed or proposed for listing
     on the National Priorities List under CERCLA or on the Comprehensive
     Environmental Response, Compensation and Liability Information System
     maintained by the Environmental Protection Agency or any analogous state
     list of sites requiring investigation or cleanup, and no underground
     storage tanks, as such term is defined in 42 U.S.C. 6901, are located on
     any property of any Obligor or any of its Subsidiaries.

          (s)  Except as set forth on Part III of Schedule 4.01(q) and except to
     the extent any of the following could not reasonably be expected to have a
     Material Adverse Effect, as of the Restatement Date neither any Obligor nor
     any of its Subsidiaries has been notified in writing by any federal, state,
     provincial or local governmental agency or any other Person that any
     Obligor or any of its Subsidiaries is potentially liable for the remedial
     or other costs with respect to treatment, storage, disposal, release,
     arrangement for disposal or transportation of any Hazardous Materials
     generated by any Obligor or any of its Subsidiaries, and Hazardous
     Materials have not been generated, used, treated, handled, stored or
     disposed of on, or released or transported to or from, any property of such
     Obligor (or, to its knowledge, any adjoining property) except in compliance
     in all material respects with all Environmental Laws and Environmental
     Permits, and all other wastes generated at any such properties by any
     Obligor or any of its Subsidiaries (and their respective agents, employees
     and contractors) have been disposed of in compliance with all Environmental
     Laws and Environmental Permits.

          (t)  Each Obligor and each of its Subsidiaries has filed, has caused
     to be filed or has been included in, all federal and state income tax
     returns and all other material tax returns (federal, state, provincial,
     local and foreign) required to be filed and has paid (or is contesting in
     good faith by appropriate proceedings) all taxes shown thereon to be owing,
     together with applicable interest and penalties.

          (u)  Set forth on Schedule 4.01(u) is a complete and accurate list, as
     of the date hereof, of each taxable year of Terra for which federal income
     tax returns have been filed and for which the expiration of the applicable
     statute of limitations for assessment or collection has not occurred by
     reason of extension or otherwise (an "Open Year").
                                           ---------

          (v)  As of the Restatement Date, there are no adjustments to the
     federal income tax liability of Terra proposed by the Internal Revenue
     Service with respect to Open Years. No issues have been raised by the
     Internal Revenue Service in respect of Open Years that, in the aggregate,
     could reasonably be expected to have a Material Adverse Effect.

          (w)  Neither any Obligor nor any of its Subsidiaries is an "investment
     company," or an "affiliated person" of, or "promoter" or "principal
     underwriter" for, an "investment
<PAGE>

                                      -54-

     company," as such terms are defined in the Investment Company Act of 1940,
     as amended. Neither any Obligor nor any of its Subsidiaries is a "holding
     company", or an "affiliate" of a "holding company" or a "subsidiary
     company" of a "holding company", within the meaning of the Public Utility
     Holding Company Act of 1935, as amended. Neither the making of any Advances
     nor the application of the proceeds or repayment thereof by the Borrower,
     nor the consummation of the other transactions contemplated hereby, will
     violate any provision of such Act or any rule, regulation or order of the
     Securities and Exchange Commission thereunder.

          (x)  Each of Terra and the Borrower (both individually and
     collectively with their respective Subsidiaries) is Solvent.

          (y)  Set forth on Part I of Schedule 4.01(y) is a complete and
     accurate list, as of the Restatement Date, of all existing Debt of each
     Obligor, showing as of the Restatement Date (i) the principal amount
     outstanding thereunder, (ii) whether such Debt is secured by any Lien and
     (iii) the aggregate principal amount of such Debt scheduled to be paid
     during each fiscal year of Terra to and including the fiscal year of Terra
     in which the Advances are to mature.

          (z)  This Agreement and each of the other Loan Documents are in proper
     legal form under the laws of Canada for the enforcement thereof against the
     Borrower under such laws, and under the laws of the United Kingdom for the
     enforcement thereof against the Subsidiary Guarantor under such laws, and
     if each of the Loan Documents were stated to be governed by such law, they
     would constitute legal, valid and binding obligations of the Borrower or
     the Subsidiary Guarantor, as the case may be, thereunder, enforceable in
     accordance with their respective terms. All formalities (if any) required
     under the laws of Canada (or, with respect to the Guarantee by the
     Subsidiary Guarantor, the United Kingdom) for the validity and
     enforceability of each of the Loan Documents (including, without
     limitation, any necessary registration, recording or filing with any court
     or other authority therein) have been accomplished, and no Taxes are
     required to be paid and no notarization is required, for the validity and
     enforceability thereof.

          (aa)  This Agreement and the other Loan Documents and the obligations
     evidenced hereby and thereby are and will at all times be direct and
     unconditional general obligations of the Borrower, and rank and will at all
     times rank in right of payment and otherwise at least pari passu with all
                                                           ---- -----
     unsecured Debt of the Borrower, whether now existing or hereafter
     outstanding, subject to statutory priority and the effect of bankruptcy and
     insolvency law. The Obligations of the Subsidiary Guarantor under Article
     VIII are and will at all times be direct and unconditional general
     obligations of the Subsidiary Guarantor, and rank and will at all times
     rank in right of payment and otherwise at least pari passu with all
                                                     ---- -----
     unsecured Debt of the Subsidiary Guarantor, whether now existing or
     hereafter outstanding, subject to statutory priority and the effect of
     bankruptcy and insolvency law. There exists no Lien (including any Lien
     arising out of any attachment, judgment or execution), nor any segregation
     or other preferential arrangement of any
<PAGE>

                                      -55-

     kind, on, in or with respect to any of the property or revenues of the
     Borrower or any of its Subsidiaries, except as expressly permitted by
     Section 5.02(a).

          (bb)  Each of the Borrower and the Subsidiary Guarantor is subject to
     civil and commercial law with respect to its obligations under this
     Agreement and each of the other Loan Documents. The execution, delivery and
     performance by the Borrower and the Subsidiary Guarantor of this Agreement
     and each of the other Loan Documents constitute private and commercial acts
     rather than public or governmental acts. Neither the Borrower, the
     Subsidiary Guarantor nor any of their respective properties or revenues is
     entitled to any right of immunity in any jurisdiction from suit, court
     jurisdiction, judgment, attachment (whether before or after judgment), set-
     off or execution of a judgment or from any other legal process or remedy
     relating to the obligations of the Borrower or the Subsidiary Guarantor, as
     the case may be, under this Agreement or any of the other Loan Documents.

          (cc)  The Borrower (i) has good title, or valid and subsisting
     leasehold interests or licenses, to all of its material properties and
     assets; and (ii) does not hold any assets as trustee of any trust, except
     for employee benefit plans for which the Borrower may be trustee or other
     fiduciary.

          (dd)  Except as could not reasonably be expected to have a Material
     Adverse Effect, the Borrower and its Subsidiaries have complied in all
     material respects with all applicable laws regarding each Canadian Employee
     Benefits Plan (including, where applicable, the Pension Benefits Act
     (Ontario) and the Income Tax Act (Canada); and each Canadian Employee
     Benefits Plan is, and has been, maintained and administered in substantial
     compliance with its terms, applicable collective bargaining agreements and
     all applicable laws (including, where applicable, the Pension Benefits Act
     (Ontario) and the Income Tax Act (Canada)).

          (ee)  There exists no outstanding liability of the Borrower or any of
     its Subsidiaries with respect to any Canadian Employee Benefit Plan that
     has been terminated, which liability could reasonably be expected to have a
     Material Adverse Effect.

          (ff)  The Borrower and its Subsidiaries have paid when due all amounts
     which the Borrower and its Subsidiaries are required to have paid under the
     terms of each Canadian Employee Benefit Plan or applicable law as
     contributions to such Canadian Employee Benefit Plan (excluding any
     nonpayment that could not reasonably be expected to have a Material Adverse
     Effect); as of the date of the most recent audit performed with respect to
     the Borrower's Canadian Employee Benefit Plans, no accumulated funding
     deficiency, whether or not waived, resulting from the action or inaction of
     the Borrower or any of its Subsidiaries existed with respect to any
     Canadian Employee Benefit Plan; and, to the best knowledge of the Borrower,
     no accumulated funding deficiency, whether or not waived,
<PAGE>

                                      -56-

     resulting from the action or inaction of the Borrower or any of its
     Subsidiaries exists with respect to any Canadian Employee Benefit Plan; and

          (gg)  Each Plan is fully funded, on a going concern basis, in
     accordance with its terms and regulatory requirements as outlined by the
     Pension Benefits Act (Ontario), administrative requirements of the Pension
     Commission of Ontario and the most recent actuarial report filed with the
     Pension Commission of Ontario in respect of such Plan, as and to the extent
     applicable, except to the extent any failure to do so could not reasonably
     be expected to have a Material Adverse Effect.

          (hh)  Neither the Borrower nor any Subsidiary of the Borrower
     sponsors, maintains or contributes to, or has at any time in the preceding
     six-year period sponsored, maintained or contributed to any "multi-employer
     pension plan" (as defined in the Pension Benefits Act (Ontario)).

          (ii)  The Borrower has (i) initiated a review and assessment of all
     areas within its and each of its Subsidiaries' business and operations that
     could be adversely affected by the inability of the computer applications
     used by the Borrower or any of its Subsidiaries to recognize and perform
     properly date-sensitive functions involving certain dates prior to, on and
     on any date after December 31, 1999 (the "Year 2000 Problem"), (ii)
                                               -----------------
     developed a plan and timeline for addressing the Year 2000 Problem on a
     timely basis, and (iii) to date, implemented that plan substantially in
     accordance with the timetable. Based on the foregoing, the Borrower
     believes that all computer applications that are material to its or any of
     its Subsidiaries' business and operations are reasonably expected on a
     timely basis to be able to perform properly date-sensitive functions for
     all dates before, on and after January 1, 2000, except to the extent that a
     failure to do so could not reasonably be expected to have a Material
     Adverse Effect.

          Section 4.02.  Representations and Warranties of each Lender. Each
                         ---------------------------------------------
Lender hereby represents and warrants that such Lender, in good faith, has not
relied upon Margin Stock as collateral for the Obligations of the Obligors
hereunder and under the other Loan Documents.

                                   ARTICLE V

                              COVENANTS OF TERRA

          Section 5.01.  Affirmative Covenants. So long as any principal of or
                         ---------------------
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, Terra will, and will cause each of the Obligors to:

          (a)   Compliance with Laws, Etc. Comply, and cause each of its
                --------------------------
     Subsidiaries to comply, with all applicable laws, rules, regulations and
     orders, such compliance to include, without limitation, compliance with
     ERISA and the Racketeer Influenced and
<PAGE>

                                      -57-

     Corrupt Organizations Chapter of the Organized Crime Control Act of 1970
     (except to the extent that non-compliance with any thereof could not
     reasonably be expected to have a Material Adverse Effect).

          (b)  Payment of Taxes, Etc. Pay and discharge, and cause each of its
               ----------------------
     Subsidiaries to pay and discharge, before the same shall become delinquent,
     (i) all taxes, assessments and governmental charges or levies imposed upon
     it or upon its property and (ii) all lawful claims that, if unpaid, might
     by law become a Lien upon its property; provided that neither such Obligor
                                             --------
     nor any of its Subsidiaries shall be required to pay or discharge any such
     tax, assessment, charge or claim that is being contested in good faith and
     by proper proceedings and as to which appropriate reserves are being
     maintained to the extent required by GAAP, unless and until any Lien
     resulting therefrom attaches to its property and becomes enforceable
     against its other creditors.

          (c)  Compliance with Environmental Laws. Comply, and cause each of
               ----------------------------------
     its Subsidiaries and all lessees and other Persons occupying its properties
     to comply, with all Environmental Laws and Environmental Permits applicable
     to its operations and properties; obtain and renew, and cause each of its
     Subsidiaries to obtain and renew, all Environmental Permits necessary for
     its operations and properties; and conduct, and cause each of its
     Subsidiaries to conduct, any investigation, study, sampling and testing,
     and undertake any cleanup, removal, remedial or other action necessary to
     remove and clean up all Hazardous Materials from any of its properties, in
     accordance with the requirements of all Environmental Laws; provided that
                                                                 --------
     (i) neither such Obligor nor any of its Subsidiaries shall be required to
     undertake any such cleanup, removal, remedial or other action to the extent
     that its obligation to do so is being contested in good faith and by proper
     proceedings and appropriate reserves to the extent required by GAAP are
     being maintained with respect to such circumstances and (ii) no such
     compliance with laws and permits, obligation to obtain or renew permits or
     obligation to undertake any such investigation, study, sampling, testing,
     removal, remedial or other action shall be required hereunder to the extent
     no Material Adverse Effect could reasonably be expected to result from any
     failure to so comply, obtain, renew or undertake, either individually or in
     the aggregate.

          (d)  Maintenance of Insurance. Maintain, and cause each of its
               ------------------------
     Material Subsidiaries to maintain, with responsible and reputable insurance
     companies or associations, insurance, including business interruption
     insurance with respect to each manufacturing plant, in such amounts and
     covering such risks as is usually carried by companies engaged in similar
     businesses.

          (e)  Preservation of Corporate Existence, Etc. Subject to Section
               -----------------------------------------
     5.02(d) and (e), preserve and maintain, and cause each of its Material
     Subsidiaries to preserve and maintain, its corporate or partnership
     existence, rights (charter and statutory) and franchises; provided that:
                                                               --------
<PAGE>

                                      -58-

               (1)  BMLP may be dissolved; and

               (2)  neither any Obligor nor any of its Subsidiaries shall be
          required to preserve any right or franchise if the Board of Directors
          of such Obligor or such Subsidiary shall determine that the
          preservation thereof is no longer desirable in the conduct of the
          business of such Obligor or such Subsidiary, as the case may be, and
          that the loss thereof will not have a Material Adverse Effect.

          (f)  Visitation Rights. At any reasonable time and as may be
               -----------------
     reasonably requested from time to time, permit the Administrative Agent or
     any of the Lenders or any agents or representatives thereof to examine and
     make copies of and abstracts from the records and books of account of, and
     visit the properties of, such Obligor and any of its Subsidiaries (in the
     presence of an appropriate officer or representative of the relevant
     Obligor), and to discuss the affairs (including, but not limited to, the
     compliance by such Obligor and its Subsidiaries with all Environmental
     Laws), finances and accounts of such Obligor and any of its Subsidiaries
     with any of their officers or directors and with their independent
     certified public accountants.

          (g)  Preparation of Environmental Reports. Upon either (i) the
               ------------------------------------
     acquisition of any real property by such Obligor or any of its Subsidiaries
     the purchase price of which exceeds $1,000,000 or (ii) the occurrence and
     during the continuance of a Default or Event of Default arising under
     Section 5.01(c), and in each case at the written request of the
     Administrative Agent, such Obligor shall provide to the Administrative
     Agent within a reasonable time after such acquisition or request, as the
     case may be, at the expense of such Obligor, an environmental site
     assessment report for the acquired property (in the case of an acquisition
     as described in clause (i)) or for any properties of such Obligor which are
     the subject of any such Default or Event of Default (in the case of an
     event as described in clause (ii)) prepared by an environmental consulting
     firm reasonably acceptable to the Administrative Agent, indicating the
     presence or absence of Hazardous Materials and the estimated cost of any
     compliance, removal or remedial action in connection with any Hazardous
     Materials on such properties (provided that if such Obligor, in the
                                   --------
     exercise of its reasonable judgment, determines not to have such an
     environmental site assessment report prepared, such Obligor shall instead
     deliver to the Administrative Agent a copy of such Obligor's internal site
     assessment report relating to relevant property). Without limiting the
     generality of the foregoing, if the Administrative Agent determines at any
     time that a material risk exists that any such report will not be provided
     within a reasonable time following such request, the Administrative Agent
     may retain an environmental consulting firm to prepare such report at the
     expense of such Obligor, such Obligor and each of its Subsidiaries hereby
     granting to the Administrative Agent, such firm and any agents or
     representatives thereof an irrevocable non-exclusive license, subject to
     the rights of tenants, to enter onto its properties to undertake such an
     assessment.
<PAGE>

                                      -59-

          (h)  Keeping of Books. Keep, and cause each of its Material
               ----------------
     Subsidiaries to keep, proper books of record and account, in which full and
     correct entries shall be made of all financial transactions and the assets
     and business of such Obligor and each such Subsidiary in accordance with
     GAAP.

          (i)  Maintenance of Properties, Etc. Maintain and preserve, and cause
               -------------------------------
     each of its Material Subsidiaries to maintain and preserve, except to the
     extent the failure to do so could not reasonably be expected to have a
     Material Adverse Effect, all of its properties that are used or useful in
     the conduct of its business in good working order and condition, ordinary
     wear and tear excepted.

          (j)  Compliance with Terms of Leaseholds. Make all payments and
               -----------------------------------
     otherwise perform all obligations in respect of all leases of real
     property, keep such leases in full force and effect and not allow such
     leases to lapse or be terminated or any rights to renew such leases to be
     forfeited or canceled, except to the extent any such lease is no longer
     used or useful in the conduct of its business or which, in the exercise of
     the reasonable judgment of the relevant Obligor, is to be refinanced and
     except to the extent failure to comply with the foregoing would not have a
     Material Adverse Effect, and cause each of its Material Subsidiaries to do
     so.

          (k)  Performance and Compliance with Material Contracts. Perform and
               --------------------------------------------------
     observe, and cause each of its Subsidiaries to perform and observe, all the
     terms and provisions of each Material Contract to be performed or observed
     by it, maintain each such Material Contract in full force and effect and
     enforce each such Material Contract in accordance with its terms, except to
     the extent the failure to do any of the foregoing could not reasonably be
     expected to have a Material Adverse Effect.

          (l)  Transactions with Affiliates. Conduct, and cause each of its
               ----------------------------
     Subsidiaries to conduct, all transactions otherwise permitted under the
     Loan Documents with any of its Affiliates on terms that are fair and
     reasonable and no less favorable to such Obligor or such Subsidiary than
     would obtain in a comparable arm's-length transaction with a Person that is
     not an Affiliate; provided that this Section 5.01(l) shall not be
                       --------
     applicable to:

                (i)  transactions between such Obligor and wholly owned
          Subsidiaries of Terra or between wholly owned Subsidiaries of Terra
          unless otherwise prohibited by this Agreement;

                (ii) compensation paid for services rendered by any director or
          officer of such Obligor or any director or officer of a Subsidiary of
          such Obligor serving at the direction or request of such Obligor to
          the extent such compensation is determined in the good faith exercise
          of business judgment by the Board of Directors of such Obligor to be
          reasonable and appropriate to the functions of such office;
<PAGE>

                                      -60-

                (iii)  transactions under Intercompany Receivables Facilities;
          and

                (iv)   transactions under the Management Agreements.

          (m)  Further Assurances. (i) Promptly upon reasonable request by the
               ------------------
     Administrative Agent or any Lender through the Administrative Agent,
     correct, and cause each Subsidiary promptly to correct, any material defect
     or error that may be discovered in any Loan Document, which material defect
     or error is the result of any untrue statement of material fact under any
     Loan Document or the omission to state a material fact necessary to make
     the statements made therein not misleading, or in the execution,
     acknowledgment or recordation of any Loan Document, (ii) promptly upon
     reasonable request by the Collateral Agent, the Administrative Agent or any
     Lender through the Administrative Agent do, execute, acknowledge, deliver,
     record, re-record, file, re-file, register and re-register, and cause any
     such Subsidiary promptly to do, execute, acknowledge, deliver, record, re-
     record, file, re-file, register and re-register, any and all such further
     acts, deeds, conveyances, pledge agreements, assignments, financing
     statements and continuations thereof, termination statements, notices of
     assignment, transfers, certificates, assurances and other instruments as
     the Collateral Agent, the Administrative Agent or any Lender through the
     Administrative Agent may reasonably require from time to time in order to
     (A) subject to the Liens created by any of the Security Documents any of
     such Obligor's and its Subsidiaries' properties, rights or interests
     covered or now or hereafter intended to be covered by any of the Security
     Documents, (B) perfect and maintain the validity, effectiveness and
     priority of any of the Security Documents and the Liens intended to be
     created thereby and (C) assure, convey, grant, assign, transfer, preserve,
     protect and confirm more effectively unto the Collateral Agent the rights
     granted or now or hereafter intended to be granted to it under any Security
     Document or under any other instrument executed in connection with any
     Security Document to which such Obligor, any other Obligor or any of their
     respective Subsidiaries is or may become a party, (iii) (1) in the event
     that the Company or any of its Subsidiaries (other than a Foreign
     Subsidiary) shall form or acquire any new Subsidiary (other than a Foreign
     Subsidiary), Terra will cause such new Subsidiary to (x) become a
     "Subsidiary Guarantor" hereunder and a "Grantor" under the Subsidiary
     Pledge and Security Agreement pursuant to documentation in form and
     substance satisfactory to the Administrative Agent and the Collateral
     Agent, (y) cause such new Subsidiary to take such action (including,
     without limitation, delivering such shares of stock and executing and
     delivering such Uniform Commercial Code financing statements) as shall be
     necessary to create and perfect valid and enforceable first priority Liens
     on substantially all of the personal property and, upon the request of the
     Administrative Agent, any material real estate of such new Subsidiary as
     collateral security for the obligations of such new Subsidiary hereunder
     and (z) deliver such proof of corporate action, incumbency of officers,
     opinions of counsel and other documents as is consistent with those
     delivered by each Obligor pursuant to Section 3.01 on the Restatement Date
     or as the Administrative Agent shall have requested and (2) in the event
     that the Company or any of its Subsidiaries (other than any Foreign
     Subsidiary or any member of the Terra
<PAGE>

                                      -61-


     Canada Group shall form or acquire any new Subsidiary that shall constitute
     a Subsidiary hereunder Terra shall take such action as shall be necessary
     to ensure that all of the stock or other ownership interests of such new
     Subsidiary are pledged to the Collateral Agent pursuant to the relevant
     Terra Capital Security Document, provided that in no event shall more than
                                      --------
     65% of the stock or other ownership interests of any such Subsidiary that
     is a Foreign Subsidiary be required to be pledged pursuant to this clause
     (m) and (iv) (1) in the event that the Borrower or any of its Subsidiaries
     shall form or acquire any new Subsidiary, the Borrower will cause such new
     Subsidiary to (x) become a "Subsidiary Guarantor" hereunder and a grantor
     under the Terra Canada Security Agreement pursuant to documentation in form
     and substance satisfactory to the Administrative Agent and the Collateral
     Agent, (y) cause such new Subsidiary to take such action (including,
     without limitation, delivering such shares of stock and executing and
     delivering such Uniform Commercial Code financing statements or similar
     instruments) as shall be necessary to create and perfect valid and
     enforceable first priority Liens on substantially all of the personal
     property and, upon the request of the Administrative Agent, any material
     real estate of such new Subsidiary as collateral security for the
     obligations of such new Subsidiary hereunder and (z) deliver such proof of
     corporate action, incumbency of officers, opinions of counsel and other
     documents as is consistent with those delivered by each Obligor pursuant to
     Section 3.01 on the Restatement Date or as the Administrative Agent shall
     have requested and (2) in the event that the Borrower or any of its
     Subsidiaries shall form or acquire any new Subsidiary, hereunder the
     Borrower shall take such action as shall be necessary to ensure that all of
     the stock or other ownership interests of such new Subsidiary are pledged
     to the Collateral Agent pursuant to the Terra Canada Security Agreement.

          (n)  Ownership of the Obligors.  Take, and will cause each of its
               -------------------------
     Subsidiaries to take, such action from time to time as shall be necessary
     to ensure that:

               (i)  Terra will at all times own, beneficially and of record, all
          of the issued and outstanding capital stock (other than directors'
          qualifying shares) of Terra Capital Holdings;

               (ii)  Terra Capital Holdings will at all times own, beneficially
          and of record, all of the issued and outstanding capital stock (other
          than directors' qualifying shares) of the Company, and will own no
          other property (other than (x) cash, (y) other property incidental to
          its business as a holding company and (z) capital stock of, or other
          ownership interests in, Receivables Subsidiaries);

               (iii)  the Company will at all times own:

                         (1) beneficially and of record, all of the issued and
               outstanding capital stock (other than directors' qualifying
               shares) of TI, BMCH, TMC and TNC and
<PAGE>

                                      -62-

                         (2) no other property, other than:

                              (A)  cash and Permitted Investments,

                              (B)  Receivables of one or more of its
                         Subsidiaries transferred to it, and capital stock of,
                         or other ownership interests in, Receivables
                         Subsidiaries,

                              (C)  Senior Preference Units purchased pursuant to
                         the SPU Redemption, and capital stock of a wholly owned
                         Subsidiary of the Company organized for the purpose of
                         holding such Senior Preference Units,

                              (D)  other property incidental to its business as
                         a holding company,

                              (E)  other property used solely in connection with
                         its performance of services pursuant to the terms of
                         the Management Agreements,

                              (F)  the TNLP Notes and

                              (G)  other Investments permitted to be held by the
                         Company pursuant to Section 5.02(f) (to the extent such
                         Investments, in the case of those made under clauses
                         (iv), (v) and (vi) of said Section 5.02(f), are subject
                         to the Lien of the Security Documents); and

               (iv)  TNCLP will at all times own no property other than
          ownership interests of TNLP and its successors (other than cash,
          Senior Preference Units purchased pursuant to the SPU Redemption and
          other property incidental to its business as a holding company).

     In the event that any such additional shares of stock or other ownership
     interests shall be issued to an Obligor by any domestic Subsidiary or first
     tier Foreign Subsidiary thereof, the respective Obligor agrees forthwith to
     deliver to the Collateral Agent pursuant to the Security Documents the
     certificates (if any) evidencing such ownership interests accompanied by
     undated powers executed in blank and to take such other action as the
     Collateral Agent or the Administrative Agent shall request to perfect the
     security interest created therein pursuant to the Security Documents,
     provided that in no event shall such Obligor be required to pledge more
     --------
     than 65% of the stock or other ownership interests of any Foreign
     Subsidiary thereof.  Without limiting the foregoing, neither TNCLP nor TNLP
     shall convert to a corporate form except pursuant to the SPU Redemption.
<PAGE>

                                      -63-

          (o)  Delivery of Management Agreements.  On or prior to the date of
               ---------------------------------
     execution of each Management Agreement, notify the Administrative Agent
     thereof (and the Administrative Agent shall notify the Lenders thereof
     promptly) and shall deliver to the Administrative Agent a certified copy
     thereof (each such Management Agreement to be in form and substance
     reasonably satisfactory to the Administrative Agent). Promptly following
     each amendment, waiver and consent relating to a Management Agreement (but
     subject to Section 5.02(p)), Terra shall give the Administrative Agent
     notice thereof (and the Administrative Agent shall notify the Lenders
     thereof promptly), and shall deliver to the Administrative Agent a
     certified or conformed copy of each such amendment, waiver and consent.

          (p)  Net Available Proceeds of Casualty Events.  Cause the Borrower
               -----------------------------------------
     and its Subsidiaries to invest in the Borrower's business all proceeds of
     casualty insurance, condemnation awards and other compensation (in any
     event not including proceeds of business interruption insurance) received
     by it in respect of Casualty Events (net of (A) reasonable expenses
     incurred by the Borrower and its Subsidiaries in connection therewith, (B)
     contractually required repayments of Debt to the extent secured by a Lien
     on the property suffering such Casualty Event and any income and transfer
     taxes payable by the Borrower in respect of such Casualty Event).

          (q)  Post-Closing Covenants Relating to Registrations, Etc.  Cause the
               ------------------------------------------------------
     Borrower, within 30 days after the date hereof, to provide to the
     Administrative Agent such evidence of registrations, recordings and other
     filings as the Administrative Agent shall have requested in order to
     perfect the Liens created by the Terra Canada Security Documents and
     covering the Collateral described therein.

          (r)  Compliance with Canadian Plans, Etc.  Cause the Borrower and each
               ------------------------------------
     of the Borrower's Subsidiaries to comply with all laws relating or
     pertaining to Canadian Employee Benefit Plans (except to the extent that
     non-compliance with any thereof could not reasonably be expected to have a
     Material Adverse Effect).

          Section 5.02.  Negative Covenants. So long as any principal of or
                         ------------------
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, Terra will not, and will not permit any of its Material
Subsidiaries to:

          (a)  Liens, Etc.  Create, incur, assume or suffer to exist, or permit
               -----------
     any of its Material Subsidiaries to create, incur, assume or suffer to
     exist, any Lien on or with respect to any of its properties of any
     character (including, without limitation, accounts) whether now owned or
     hereafter acquired, or sign or file, or permit any of its Subsidiaries to
     sign or file, under the Uniform Commercial Code or other applicable
     personal property security legislation of any jurisdiction, a financing
     statement that names such Obligor or any of its Subsidiaries as debtor, or
     sign, or permit any of its Subsidiaries to sign, any security agreement
     authorizing any secured party thereunder to file such financing statement,
     or assign, or permit any of its Subsidiaries to assign, any accounts or
     other
<PAGE>

                                      -64-

     right to receive income, excluding from the operation of the foregoing
                              ---------
     restrictions the following:

               (i)   Liens created by the Terra Capital Security Documents to
          secure the "Secured Obligations" referred to therein;

               (ii)  Permitted Liens; Liens in favor of banks which arise under
          Article 4 of the Uniform Commercial Code on items in collection and
          documents relating thereto and proceeds thereof; and Liens in favor of
          customs and revenue authorities arising as a matter of law to secure
          customs duties in connection with the importation of goods;

               (iii) Liens existing on the Restatement Date and described on
          Part I of Schedule 5.02(a)(iii);

               (iv)  On or prior to September 25, 1999, Liens on cash (in an
          aggregate amount, for Terra and its Subsidiaries taken as a whole, not
          exceeding $15,000,000 at any time) to secure the Obligations in
          respect of letters of credit permitted under Section 5.02(b)(1)(iv)
          (provided that all such Liens permitted under this clause (iv) are
           --------
          released and discharged (to the satisfaction of the Administrative
          Agent) by not later than September 25, 1999);

               (v)   Purchase money Liens upon or in property acquired or held
          by Terra or such Subsidiary in the ordinary course of business to
          secure the purchase price of such property or to secure Debt
          (including, without limitation, commercial letters of credit) incurred
          solely for the purpose of financing the acquisition, construction or
          improvement of any such property to be subject to such Liens, or Liens
          existing on any such property at the time of acquisition (and not
          created in anticipation thereof), or extensions, renewals or
          replacements of any of the foregoing for the same or a lesser amount;
          provided that (x) no such Lien shall extend to or cover any property
          --------
          other than the property being acquired, constructed or improved, and
          no such extension, renewal or replacement shall extend to or cover any
          property not theretofore subject to the Lien being extended, renewed
          or replaced; and (y) the Debt secured by any such Lien shall at no
          time exceed 100% of the fair market value (as determined in good faith
          by the Senior Financial Officer) of such property at the time it was
          acquired;

               (vi)  Any Lien arising after the Restatement Date in favor of any
          state of the United States of America or any agency, political
          subdivision or instrumentality thereof, upon any pollution abatement
          or control facilities being financed in compliance with Section
          103(c)(4)(F) of the Internal Revenue Code of 1986, as in effect on the
          date of this Agreement (or any successor statute which is similar in
          all substantive respects), the interest payable in respect of which
          financing is excluded from gross income under said Section 103,
          provided that (x)
          --------
<PAGE>

                                      -65-

          the Debt secured by such Lien is not prohibited by clause (b)(1) of
          this Section 5.02, and (y) such Lien does not cover any other property
          at any time owned by Terra or any Material Subsidiary;

               (vii)  Liens on property that is the subject of a capital lease
          outstanding on the Restatement Date and set forth in Part II of
          Schedule 5.02(a)(iii) to secure the performance of the Capital Lease
          Obligations relating thereto;

               (viii) Liens upon property of a Person that becomes a Subsidiary
          of Terra after the Restatement Date, each of which Liens existed on
          such property before the time such Person became a Subsidiary of Terra
          and was not created in anticipation thereof; provided that no such
                                                       --------
          Lien shall extend to or cover any property of Terra or any of its
          Subsidiaries other than the property subject to such Liens at the time
          such Person became a Subsidiary of Terra and improvements thereon;

               (ix)   Leases or subleases, and licenses or sublicenses, granted
          to third Persons not interfering in any material respect with the
          business of Terra or such Subsidiary, and registrations or notices
          made in respect thereof;

               (x)    Easements, rights-of-way, restrictions, minor defects or
          irregularities in title and other similar charges or encumbrances not
          interfering in any material respect with the ordinary conduct of the
          business of Terra or such Subsidiary;

               (xi)   Liens arising from financing statements (whether under the
          Uniform Commercial Code, the Ontario Personal Property Security Act or
          similar legislation) regarding operating leases permitted by this
          Agreement;

               (xii)  Any interest or title of a lessor or sublessor or licensor
          under any lease or license permitted or not prohibited by this
          Agreement;

               (xiii) Additional Liens upon property created after March 31,
          1998, provided that the aggregate Debt secured thereby and incurred on
                --------
          and after the Restatement Date shall not exceed $5,000,000 in the
          aggregate at any one time outstanding;

               (xiv)  Liens on property constituting all or part of the Ammonia
          Loop incurred in connection with the construction thereof (which Liens
          shall be terminated upon the completion thereof or as soon thereafter
          as reasonably practicable);

               (xv)   The replacement, extension or renewal of any Lien
          permitted by clauses (iii), (viii), (xiii) and (xiv) above upon or in
          the same property theretofore subject thereto or the replacement,
          extension or renewal (without increase in the
<PAGE>

                                      -66-

          principal amount or change in any direct or contingent obligor) of the
          Debt secured thereby;

               (xvi)   Liens under the Terra Canada Security Documents to secure
          the obligations hereunder and under the other Loan Documents;

               (xvii)  Liens on property of Terra U.K. to secure the Terra U.K.
          Term Loan;

               (xviii) Liens securing obligations of the Company and its
          Subsidiaries under Hedge Agreements in respect of nitrogen and natural
          gas prices permitted by Section 5.02(c); and

               (xix)   Liens on property of Terra and its Subsidiaries (other
          than (1) property subject to the Liens under the Security Documents
          and (2) property subject to any Liens securing Debt of Terra or such
          Subsidiaries) in favor of Terra or any of its Subsidiaries to secure
          Debt owing to Terra or any of its Subsidiaries.

          (b)  Debt.
               ----

          (1)  Generally.  Create, incur, assume or suffer to exist, or permit
               ---------
     any of its Subsidiaries to create, incur, assume or suffer to exist, any
     Debt other than:

               (i)   Debt under the Loan Documents;

               (ii)  Debt in respect of Hedge Agreements permitted by Section
          5.02(c);

               (iii) Debt in respect of unsecured trade payables (and
          Obligations in respect of letters of credit supporting such trade
          payables);

               (iv)  Debt (including, without limitation, Obligations in respect
          of letters of credit) not secured by any Lien (other than Liens
          permitted by Section 5.02(a)(iv)), so long as, on the date of the
          incurrence thereof, the aggregate principal amount (or the U.S. Dollar
          equivalent of the aggregate principal amount) of all Debt of Terra and
          its Subsidiaries on a Consolidated basis (as reasonably determined by
          the Senior Financial Officer on and as of the date of such incurrence)
          then outstanding under this clause (iv) (including, without
          limitation, the Debt proposed to be incurred on such date) does not
          exceed $10,000,000;

               (v)   Obligations of the Company and its Subsidiaries under the
          Intercompany Receivables Facilities;
<PAGE>

                                      -67-

               (vi)   Debt securities of Terra issued in a public offering
          pursuant to an effective registration statement the terms of which
          (including, without limitation, as to interest rates, amortization
          (provided that in any event no payments of principal, redemptions,
          ---------
          sinking fund payments or the like shall be scheduled to be made before
          the date on which the Advances are to mature), redemption, average
          life to maturity, covenants, events of default and other terms) are
          reasonably satisfactory to the Required Lenders;

               (vii)  Debt outstanding (or committed to be made available) as at
          the Restatement Date and set forth on Schedule 4.01(y);

               (viii) endorsement of negotiable instruments for deposit or
          collection or similar transactions in the ordinary course of business;

               (ix)   Intercompany Debt permitted under Section 5.02(b)(2);

               (x)    Debt secured by Liens permitted under Section 5.02(a)(v);
          purchase money Debt secured by Liens permitted under 5.02(a)(viii);
          and Debt in an aggregate principal amount not exceeding $5,000,000 at
          any one time outstanding secured by Liens permitted under Section
          5.02(a)(xiii);

               (xi)   Acquired Debt in an aggregate principal amount not
          exceeding $10,000,000 at any one time outstanding;

               (xii)  1995 Terra Debt (and Debt of Terra evidenced by
          instruments issued in exchange for such Debt), and renewals,
          refinancings and replacements thereof  (without increase in the
          principal amount or change in any direct or contingent obligor, and on
          such other terms and conditions as shall be no less favorable to Terra
          and its Subsidiaries than the Debt being so renewed, refinanced or
          replaced);

               (xiii) renewals, refinancings and replacements of the Debt
          permitted under clauses (vi), (vii), (x) and (xi) above and clause
          (xv) below (without increase in the principal amount or change in any
          direct or contingent obligor and not including any Debt to be paid or
          prepaid with the proceeds of Advances);

               (xiv)  Debt of Terra to former shareholders of Huntting Elevator
          Company in an aggregate principal amount not exceeding $7,000,000;

               (xv)   Debt of the Company under the Terra Capital Credit
          Facility, and Guarantees thereof by Terra and one or more of its
          Subsidiaries;

               (xvi)  Guarantees by Terra U.K. of Terra U.K. Customer Debt;
          provided that:
          --------
<PAGE>

                                      -68-

                    (A)    the aggregate principal amount of such Debt so
               Guaranteed by Terra U.K. with respect to any customer at any time
               shall not exceed 50% of the aggregate principal amount of the
               Terra U.K. Customer Debt of such customer outstanding at such
               time; and

                    (B)    the aggregate principal amount of Terra U.K. Customer
               Debt Guaranteed by Terra U.K. at any time during any fiscal year
               of Terra U.K. shall not exceed (x) (Pounds)15,000,000 minus (y)
                                                                     -----
               the aggregate amount of payments made by Terra U.K. under all
               such Guarantees during such fiscal year;

               (xvii)  unsecured Debt of Terra U.K. in an aggregate principal
          amount not at any time exceeding (Pounds)2,000,000;

               (xviii) unsecured Debt of the Borrower in an aggregate principal
          amount not at any time exceeding $2,000,000 (or its equivalent in
          Canadian Dollars at the time of the borrowing thereof); and

               (xix)   Debt of Terra and its Subsidiaries ("Special Refinancing
                                                           -------------------
          Debt"), provided that:
          ----

                    (I)    such Special Refinancing Debt refinances or replaces
               Debt outstanding under clause (vi), (vii) or (xv) of this Section
               5.02(b)(1) ("Refinanceable Debt") within 45 days after the
               incurrence of such Special Refinancing Debt;

                    (II)   the proceeds of such Special Refinancing Debt are
               used, among other things, to refinance or replace Refinanceable
               Debt, to pay call premiums (if any) on the Refinanceable Debt so
               refinanced or replaced and reasonable fees and expenses incurred
               by Terra and its Subsidiaries in connection therewith;

                    (III)  the aggregate principal amount of outstanding Special
               Refinancing Debt does not exceed the aggregate principal amount
               of Refinanceable Debt so refinanced or replaced plus $16,500,000;
               and

                    (IV)   until the proceeds of such Special Refinancing Debt
               are applied to the outstanding principal amount of Refinanceable
               Debt, such proceeds are held in an account pursuant to escrow or
               similar arrangements in form and substance satisfactory to the
               Administrative Agent; and
<PAGE>

                                      -69-

               (xx)  Guarantees incurred by TI prior to the Restatement Date;
          provided that the aggregate outstanding principal amount of Terra
          --------
          Customer Debt Guaranteed by TI at any time during any fiscal year of
          TI shall not exceed $2,600,000 plus the Indemnified Amount then in
                                         ----
          effect.  For purposes of this Section 5.02(b)(1)(xx) "Indemnified
          Amount" at any time means the lesser of (A) the aggregate outstanding
          principal amount of Terra Customer Debt Guaranteed by TI as to which
          Cenex shall have agreed to indemnify TI and (B) $7,400,000.

          (2)  Intercompany Debt.  Create, incur, assume or suffer to exist, or
               -----------------
     permit any of its Subsidiaries to create, incur, assume or suffer to exist,
     any Intercompany Debt other than:

               (i)   Intercompany Debt outstanding on the Restatement Date
          (other than Debt of TNLP);

               (ii)  Intercompany Debt of TNLP to the Company evidenced by
          promissory notes payable to the Company (such notes collectively the
          "TNLP Notes"), provided that (i) such Debt is used solely to finance
          -----------    --------
          the ongoing working capital needs of TNLP, to finance Capital
          Expenditures by TNLP permitted to be made under 5.02(h) and to finance
          Investments by TNLP permitted to be made by Section 5.02(f)(xiv) and
          (ii) such Debt is secured by a first and prior perfected security
          interest in favor of the Company covering property of TNLP having an
          aggregate fair market value not at any time less than the aggregate
          principal amount of the TNLP Notes outstanding at such time;

               (iii) additional Intercompany Debt of any wholly owned
          Subsidiary of Terra (other than Debt of TNLP, Terra Canada and Terra
          U.K.);

               (iv)  additional Intercompany Debt of Terra Canada and Terra U.K.
          in an aggregate principal amount not at any time exceeding
          $75,000,000;

               (v)   additional Intercompany Debt of members of the Terra Canada
          Group the proceeds of which are used solely to repay the Advances
          (together with accrued interest and fees thereon) hereunder;

               (vi)  Debt of Terra U.K. to Terra U.K. Holdings in an aggregate
          principal amount not exceeding $175,000,000 and outstanding on the
          Restatement Date (the "Terra U.K. Term Loan"), provided that any
                                 --------------------    --------
          portion of the Terra U.K. Term Loan that is prepaid or repaid and
          subsequently reborrowed shall not be permitted by this clause (v);

               (vii) additional Intercompany Debt of any Subsidiary of TNLP to
          TNLP in an aggregate principal amount not exceeding $500,000; and
<PAGE>

                                      -70-

               (viii)  additional Intercompany Debt.

          (c)  Hedge Agreements.  Enter into or permit to be outstanding, or
               ----------------
     permit any of its Subsidiaries to enter into or permit to be outstanding,
     any Hedge Agreement other than:

               (1)  Hedge Agreements entered into prior to the Restatement Date
          in respect of interest rates, foreign exchange rates or natural gas
          prices and identified on Schedule 5.02(c);

               (2)  the Ammonium Nitrate Hedging Agreement; and

               (4)  other Hedge Agreements entered into in the ordinary course
          of business and in a reasonably prudent manner and not for speculative
          purposes, in each case in order to protect against the fluctuation in
          interest rates, foreign exchange rates, natural gas prices or nitrogen
          prices.

          (d)  Mergers, Etc.  Merge or consolidate with or into, or enter into
               -------------
     any transaction of amalgamation with, any Person, or permit any of its
     Material Subsidiaries to do so, except that:

               (i)   if no Default or Event of Default shall have occurred and
          be continuing or would result therefrom, (x) any Subsidiary of the
          Company may be merged or consolidated with or into the Company
          (provided that the Company shall be the continuing or surviving
          ---------
          corporation) or any other wholly owned Subsidiary of the Company and
          (y) the Company or any of its Subsidiaries may merge or consolidate
          with any other Person; provided that (1) in the case of a merger or
                                 --------
          consolidation of the Company, the Company is the continuing or
          surviving corporation, and (2) in any other case, the continuing or
          surviving corporation is a wholly owned Subsidiary of the Company; and

               (ii)  if no Default or Event of Default shall have occurred and
          be continuing or would result therefrom, (x) any Outside Subsidiary
          may be merged or consolidated with or into Terra (provided that Terra
                                                            --------
          shall be the continuing or surviving corporation) or any other wholly
          owned Outside Subsidiary of Terra and (y) Terra or any of its Outside
          Subsidiaries may merge or consolidate with any other Person (other
          than Terra Capital Holdings or any of its Subsidiaries); provided that
                                                                   --------
          (1) in the case of a merger or consolidation of Terra, Terra is the
          continuing or surviving corporation, and (2) in any other case, the
          continuing or surviving corporation is a wholly owned Outside
          Subsidiary of Terra.

     Notwithstanding anything in this Section 5.02(d) to the contrary, the
     Borrower shall not enter into any transaction of amalgamation with, or
     merge or consolidate with or into, any Person unless (x) (1) the Borrower
     shall be the continuing or surviving corporation or (2)
<PAGE>

                                      -71-

     the continuing or surviving corporation has assumed, pursuant to a written
     instrument in form and substance satisfactory to the Administrative Agent
     and each Lender and (y) after giving effect thereto, no Default or Event of
     Default shall have occurred and be continuing.

          (e)  Sales, Etc., of Assets.  Sell, lease, transfer or otherwise
               ----------------------
     dispose of (including, without limitation, in a sale-leaseback
     transaction), or permit any of its Subsidiaries to sell, lease, transfer or
     otherwise dispose of (including, without limitation, in a sale-leaseback
     transaction), any of its assets, including (without limitation) any
     manufacturing plant or substantially all assets constituting the business
     of a division, branch or other unit operation, except:

               (i)    sales of inventory and Permitted Investments in the
          ordinary course of its business;

               (ii)   sales or other dispositions of obsolete or worn-out
          equipment no longer used or useful in its business;

               (iii)  dispositions of assets by one member of the Specified
          Group to another member of the Specified Group (where "Specified
                                                                 ---------
          Group" means, collectively, the Company and each of its wholly owned
          -----
          Subsidiaries);

               (iv)   (W) to the extent not permitted pursuant to clause (iii)
          above, dispositions of assets by one Obligor to another and by an
          Obligor to one of its or any other Obligor's wholly owned
          Subsidiaries, (X) other Dispositions with the consent of the Required
          Lenders, (Y) other Dispositions (and other sales, assignments,
          transfers or other dispositions of property sold or disposed of in the
          ordinary course of business and on ordinary business terms and other
          sales, assignments, transfers or other dispositions of items no longer
          necessary in the business of Terra or any of its Subsidiaries) in an
          aggregate amount not to exceed $5,000,000 in any period of 12
          consecutive months (beginning after the Restatement Date) and (Z)
          dispositions of precious metals for recovery from spent catalysts and
          repurchases thereof for catalytic purposes; provided that, in the case
                                                      --------
          of all Dispositions under this clause (iv) (A) each such asset is sold
          for an amount not less than its fair market value and (B) no such
          asset may be sold to the extent that it is, individually or when
          considered with any other asset or assets sold or expected to be sold
          in such period (but taking into account property acquired in exchange
          for, or to be acquired substantially contemporaneously with the
          disposition of, the assets so sold or expected to be sold), material
          to the business, assets, operations, properties or financial condition
          of Terra and its Subsidiaries taken as a whole, and to the extent the
          assets subject to the Disposition constituted part of the Collateral,
          all other cash and non-cash proceeds of such Disposition become
          subject to the Lien created by the Security Documents in accordance
          with the terms thereof;
<PAGE>

                                      -72-

               (v)    nothing in this Section 5.02(e) shall prohibit the Company
          or any of its Subsidiaries from selling Receivables under any
          Intercompany Receivables Facility;

               (vi)   transfers of assets by Terra or one of the Outside
          Subsidiaries, directly or indirectly, to a wholly owned Subsidiary of
          Terra (a "Recipient") so long as the consideration paid by such
                    ---------
          Recipient (if any) for all such assets does not exceed the fair market
          value of such property;

               (vii)  (A) transfers of assets by Terra or one of its wholly
          owned Subsidiaries to TNCLP or a Subsidiary thereof so long as the
          consideration paid to Terra and its wholly owned Subsidiaries for all
          such assets is not less than the fair market value of such property;
          and (B) transfers of assets by TNCLP or a Subsidiary thereof to Terra
          or one of its wholly owned Subsidiaries so long as the consideration
          paid by Terra and its wholly owned Subsidiaries for all such assets
          does not exceed the fair market value of such property;

               (viii) dividends with respect to the capital stock of Terra U.K.
          for any fiscal year of the Borrower in an aggregate amount not
          exceeding the aggregate amount required to be paid by the Borrower to
          ICI pursuant to the terms of the Ammonium Nitrate Hedging Agreement
          for such fiscal year;

               (ix)   the sale of the Distribution Business by Terra pursuant to
          the Distribution Business Sale Agreement (including, without
          limitation, the sale, assignment, transfer or disposition to one or
          more third parties of any property excluded from the sale of the
          Distribution Business pursuant to Section 4.1.13.3 of the Distribution
          Business Sale Agreement) and the sale by BMLP of all or any portion of
          its ownership interests in its methanol plant located in Beaumont,
          Texas; and

               (x)    additional dividends, sales, leases, transfers and other
          dispositions of property by the Borrower and its Subsidiaries (other
          than (1) property subject to the Liens under the Security Documents
          and (2) property subject to any Liens securing Debt of the Borrower or
          such Subsidiary) to Terra or any of its Subsidiaries.

          (f)  Investments.  Make or hold, or permit any of its Subsidiaries to
               -----------
     make or hold, any Investment, other than:

               (i)    Investments by Terra and its Subsidiaries in cash and
          Permitted Investments;
<PAGE>

                                      -73-

               (ii)   Investments constituting (A) operating deposit accounts
          with banks and (B) Receivables arising in the ordinary course of
          business on ordinary business terms, in each case in accordance with,
          and subject to the terms of, the Security Documents;

               (iii)  Investments described in Schedule 5.02(f);

               (iv)   Investments arising solely by reason of any merger or
          consolidation expressly permitted by Section 5.02(d)(i)(x) or
          5.02(d)(ii)(x);

               (v)    Specified Acquisitions to the extent permitted to be made
          under Section 5.02(h);

               (vi)   Investments consisting of acquisitions of property
          (including, without limitation, ownership interests in any Person) by
          Terra or any of its Subsidiaries so long as (x) the aggregate fair
          market value of all such property acquired in any fiscal year of Terra
          shall not exceed $50,000,000, and (y) the consideration paid by Terra
          and its Subsidiaries for each such acquisition consists solely of
          equity securities issued by Terra;

               (vii)  Investments in respect of Hedge Agreements permitted by
          Section 5.02(c);

               (viii) Investments made pursuant to Terra's Supplemental
          Deferred Compensation Plan, and its Excess Benefit Plan, each as in
          effect from time to time;

               (ix)   Investments by Terra and its Subsidiaries consisting of
          the purchase, redemption or other acquisition of Senior Preference
          Units pursuant to the SPU Redemption, provided that the aggregate
                                                --------
          amount of all such Investments under this clause (ix) for any fiscal
          year of Terra plus the aggregate amount of Capital Expenditures and
                        ----
          Specified Acquisitions by Terra and its Subsidiaries during such
          fiscal year does not exceed (i) $80,000,000 for the fiscal year of
          Terra ending December 31, 1999 and (ii) $35,000,000 for each fiscal
          year of Terra ending thereafter;

               (x)    Debt (including Guarantees of Debt) constituting
          Investments, to the extent such Debt is permitted under Section
          5.02(b);

               (xi)   capital contributions to Receivables Subsidiaries;

               (xii)  Investments in respect of the purchase of the BMLP Class A
          Limited Partnership Interest as required under Section 3.01(p);

<PAGE>

                                      -74-

               (xiii)  Investments by one member of the Specified Group in
          another member of the Specified Group (other than members of the Terra
          Canada Group);

               (xiv)   Investments by TNLP in any Subsidiary or Affiliate of
          TNLP in an aggregate amount not exceeding at any one time $500,000;

               (xv)    Investments by Terra or Terra Capital Holdings in the
          Company; and

               (xvi)   additional Investments by the Borrower and its
          Subsidiaries in Terra or any of its Subsidiaries.

          (g)  Payments to Minority Interests.  Pay or cause to be paid, or
               ------------------------------
     permit any of its Subsidiaries to pay or cause to be paid, to any holder of
     a minority interest any amount with respect to such minority interest in
     excess of the amount to which such holder is legally entitled, unless Terra
     or such Subsidiary simultaneously receives payment in an amount equal to or
     greater than its ratable share of the amount of the related distribution
     (determined in accordance with the respective interests then held by Terra
     and such Subsidiary, on the one hand, and such holder, on the other),
     provided that the SPU Redemption and payments pursuant to the purchase of
     --------
     the BMLP Class A Limited Partnership Interest as required under Section
     3.01(p) (and any payments related thereto after the Restatement Date) will
     not constitute a breach of this Section 5.02(g).

          (h)  Restricted Transactions, Etc.  Make any Capital Expenditures or
               -----------------------------
     Specified Acquisitions, except for Capital Expenditures and Specified
     Acquisitions such that the aggregate amount of all Investments permitted
     under Section 5.02(f) (ix) for any fiscal year of Terra plus the aggregate
                                                             ----
     amount of Capital Expenditures and Specified Acquisitions by Terra and its
     Subsidiaries during such fiscal year does not exceed (i) $80,000,000 for
     the fiscal year of Terra ending December 31, 1999 and (ii) $35,000,000 for
     each fiscal year of Terra ending thereafter.

          (i)  Change in Nature of Business.  Make, or permit any of its
               ----------------------------
     Material Subsidiaries to make, any material change in the nature of the
     business of Terra and its Subsidiaries taken as a whole as carried on at
     the Restatement Date, provided that the sale by Terra of the Distribution
                           --------
     Business as contemplated in the Distribution Business Sale Agreement, the
     sale by Terra of all of its ownership interests in BMLP or the sale by BMLP
     of all of its ownership interests in its methanol plant located in
     Beaumont, Texas shall not constitute a breach of this Section 5.02(i).

          (j)  Charter Amendments.  Amend, or permit any of its Material
               ------------------
     Subsidiaries to amend, its articles of incorporation or bylaws, or amend
     any partnership agreement to which it or any of its Subsidiaries is a party
     (except for amendments to authorize the issuance of preferred or common
     stock), in each case to the extent any such amendment could reasonably be
     expected to have a Material Adverse Effect.
<PAGE>

                                      -75-

          (k)  Accounting Changes.  Make or permit, or permit any of its
               ------------------
     Subsidiaries to make or permit, any change in accounting policies or
     reporting practices, except as required or permitted by generally accepted
     accounting principles in effect in the United States; provided that in the
                                                           --------
     event of any change in generally accepted accounting principles from the
     date of the financial statements referred to in Section 4.01(f) and upon
     delivery of any financial statement and accompanying certificate of
     compliance required to be furnished under subsections (b) and (c) of
     Section 5.03, Terra shall deliver to the Lenders a statement of
     reconciliation conforming any information contained in such financial
     statement and a certificate of compliance required to be furnished pursuant
     to subsections (b) and (c) of Section 5.03 with GAAP (it being understood
     that compliance with financial covenants herein shall be measured and
     determined on the basis of GAAP).

          (l)  Amendment of Ammonium Nitrate Hedging Agreement.  Consent to or
               ------------------------------------------------
     accept any cancellation or termination of the Ammonium Nitrate Hedging
     Agreement, amend, modify or change in any manner any material term or
     condition thereof, waive any default under or any breach of any material
     term or condition thereof, agree in any manner to any other amendment,
     modification or change of any material term or condition thereof, in each
     case without the prior consent of the Lenders.

          (m)  Certain Obligations Respecting Subsidiaries.  Enter into, or
               -------------------------------------------
     permit any of its Subsidiaries (other than a Receivables Subsidiary) to
     enter into, after the Restatement Date, any indenture, agreement,
     instrument or other arrangement that, directly or indirectly, prohibits or
     restrains, or has the effect of prohibiting or restraining, or imposes
     materially adverse conditions upon, the declaration or payment of dividends
     or the making of loans or advances to or Investments in or the sale,
     assignment, transfer or other disposition of property to Terra or any
     Subsidiary thereof (other than a Receivable Subsidiary); provided that:
                                                              --------

                 (1)  the Terra U.K. Term Loan Agreement (or any agreement which
          refinances part or all of the Terra U.K. Term Loan Agreement) may
          restrict such actions by Terra U.K. and its Subsidiaries; and

                 (2)  this Agreement and the other Loan Documents may restrict
          such actions by the Borrower and its Subsidiaries.

          (n)  Subordinated Indebtedness.  Purchase, redeem, retire or otherwise
               -------------------------
     acquire for value, or set apart any money for a sinking, defeasance or
     other analogous fund for the purchase, redemption, retirement or other
     acquisition of, or make any voluntary payment or prepayment of the
     principal of or interest on, or any other amount owing in respect of, any
     Subordinated Indebtedness (other than Intercompany Debt) (and such Obligor
     will not permit any of its Subsidiaries to do any of the foregoing), in
     each case except for regularly scheduled payments of principal and interest
     in respect thereof required pursuant to the instruments evidencing such
     Subordinated Indebtedness, or amend the documentation creating or
     evidencing such Subordinated Indebtedness.
<PAGE>

                                      -76-


          (o)  Transactions with Affiliates. Except to the extent otherwise
               ----------------------------
     expressly permitted hereunder, enter into any transaction with any
     Affiliate on terms less favorable than would pertain in a transaction
     entered into with a third party on an arm's-length basis.

          (p)  Amendments to Management Agreements. Without the consent of the
               -----------------------------------
     Administrative Agent, amend, modify or change in any material respect the
     terms or conditions of any Management Agreement.

          (q)  Margin Stock. Permit more than 25%, after applying the proceeds
               ------------
     of each Advance, of the value of the assets of the Borrower and of the
     Borrower and its Subsidiaries taken as a whole (as determined in good faith
     by the Borrower) that are subject to Section 5.02(a) or Section 5.02(e) to
     consist of or be represented by Margin Stock.

          (r)  Dividend Payments. On any Restricted Payment Date, make or
               -----------------
     declare any dividend payment (in cash, property or obligations) on, or
     other payment or distribution on account of, or set apart money for a
     sinking or other analogous fund for, or purchase, redeem, retire or
     otherwise acquire, any shares of any class of stock of Terra or any
     warrants, options or other rights to acquire the same (or make any payment
     to any Person, such as "phantom stock" payments, where the amount thereof
     is calculated with reference to the fair market or equity value of Terra,
     other than any such payment made in the ordinary course of business of such
     Person in connection with an executive compensation plan approved by the
     Board of Directors of such Person), but excluding dividends payable solely
     in shares of common stock of Terra. For purposes of this Section 5.02(r)
     "Restricted Payment Date" means a date as of which the Debt to Cash Flow
     Ratio for the most recently concluded Rolling Period is greater than or
     equal to 5.50 to 1.00.

          (s)  Canadian Employee Benefit Plan Compliance. Permit the Borrower
               -----------------------------------------
     or any of the Borrower's Subsidiaries:

                (i)  to terminate any Canadian Employee Benefit Plan in a
          manner, or take any other action with respect to any Canadian Employee
          Benefit Plan, which could reasonably be expected to have a Material
          Adverse Effect;

                (ii) to fail to make full payment when due of all amounts which,
          under the provisions of any Canadian Employee Benefit Plan, any
          agreement relating thereto or any applicable law, the Borrower or a
          Subsidiary of the Borrower is required to pay as contributions
          thereto, except where the failure to make such payments could not
          reasonably be expected to have Material Adverse Effect;

<PAGE>

                                      -77-

                (iii)  to permit to exist any accumulated funding deficiency,
          whether or not waived, with respect to any Canadian Employee Benefit
          Plan in an amount which could reasonably be expected to have a
          Material Adverse Effect;

                (iv)   to allow the actuarial present value of the benefit
          liabilities (computed on an accumulated benefit obligation basis in
          accordance with generally accepted accounting principles in Canada and
          with Canadian actuarial standards) under all Canadian Employee Benefit
          Plans in the aggregate to exceed the current value of the assets of
          all such Canadian Employee Benefit Plans in the aggregate that are
          allocable to such benefit liabilities, in each case only to the extent
          such liabilities and assets relate to benefits to be paid to employees
          of the Borrower or its Subsidiaries, by an amount that could
          reasonably be expected to have a Material Adverse Effect.

          Section 5.03.  Reporting Requirements. So long as any principal of or
                         ----------------------
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid:

          (a)  Default Notice. Each Obligor will furnish to the Administrative
               --------------
     Agent, as soon as possible and in any event within five Business Days after
     such Obligor knows or has reason to believe that a Default or Event of
     Default has occurred (which Default or Event of Default is continuing on
     the date of the following statement), a statement of the Senior Financial
     Officer setting forth details of such Default or Event of Default and the
     action that such Obligor has taken and proposes to take with respect
     thereto.

          (b)  Quarterly Financials. As soon as available and in any event
               --------------------
     within 60 days after the end of each of the first three quarters of each
     fiscal year of Terra, Terra will furnish to the Administrative Agent, with
     sufficient copies for each Lender, a Consolidated balance sheet of Terra
     and its Subsidiaries as of the end of such quarter and Consolidated
     statements of income and cash flows of Terra and its Subsidiaries for the
     period commencing at the end of the previous fiscal year and ending with
     the end of such quarter, setting forth in each case in comparative form the
     corresponding figures for the corresponding period of the preceding fiscal
     year in reasonable detail and duly certified (subject to year-end audit
     adjustments) by the Senior Financial Officer as having been prepared in
     accordance with GAAP, together with (i) a certificate of said officer (A)
     stating that no Default or Event of Default has occurred and is continuing
     or, if a Default or Event of Default has occurred and is continuing, a
     statement as to the nature thereof and the action that Terra has taken and
     proposes to take with respect thereto, (B) stating that since December 31,
     1998, there has been no Material Adverse Change with respect to Terra and
     (C) providing a comparison between the financial position and results of
     operations set forth in such financial statements with the comparable
     information set forth in the financial projections and budget most recently
     delivered pursuant Section 5.03(l) of the 1995 Terra Capital Credit
     Agreement or Section 5.03(l) and (ii) a schedule in form satisfactory to
     the Administrative Agent of the computations used by Terra in determining
     compliance with the covenants contained in Section 5.04.
<PAGE>

                                      -78-

          As soon as available and in any event within 60 days after the end of
     each of the first three quarters of each fiscal year of the Borrower, the
     Borrower will furnish to the Administrative Agent, with sufficient copies
     for each Lender, a Consolidated balance sheet of the Borrower and its
     Subsidiaries as of the end of such quarter and Consolidated statements of
     income and cash flows of the Borrower and its Subsidiaries for the period
     commencing at the end of the previous fiscal year and ending with the end
     of such quarter, setting forth in each case in comparative form the
     corresponding figures for the corresponding period of the preceding fiscal
     year in reasonable detail and duly certified (subject to year-end audit
     adjustments) by the Senior Financial Officer as having been prepared in
     accordance with GAAP and attaching a schedule in form satisfactory to the
     Administrative Agent of the computations used by the Borrower in
     determining, as of the end of such fiscal quarter, compliance with the
     covenants contained in Section 5.04.

          (c)  Annual Financials. As soon as available and in any event within
               -----------------
     110 days after the end of each fiscal year of Terra, Terra will furnish to
     the Administrative Agent, with sufficient copies for each Lender, a copy of
     the annual audit report for such year for Terra and its Subsidiaries,
     including therein a Consolidated balance sheet of Terra and its
     Subsidiaries as of the end of such fiscal year and Consolidated statements
     of income and cash flows of Terra and its Subsidiaries for such fiscal
     year, setting forth in each case in comparative form the corresponding
     figures for the preceding fiscal year accompanied by an unqualified opinion
     of Deloitte & Touche or other independent public accountants of nationally
     recognized standing stating that, except as expressly disclosed therein,
     said Consolidated financial statements present fairly, in all material
     respects, the Consolidated financial position and results of operations of
     Terra and its Consolidated Subsidiaries as of the last day of, and for,
     such fiscal year, together with (i) a certificate of such accounting firm
     to the Lenders stating that in the course of the regular audit of the
     business of Terra and its Subsidiaries, which audit was conducted by such
     accounting firm in accordance with generally accepted auditing standards,
     such accounting firm has obtained no knowledge that a Default or Event of
     Default has occurred and is continuing, or if, in the opinion of such
     accounting firm, a Default or Event of Default has occurred and is
     continuing, a statement as to the nature thereof (it being understood that
     said accountants shall have no liability to the Administrative Agent, the
     Lenders for failure to obtain knowledge of any Default or Event of
     Default), (ii) a schedule in form satisfactory to the Administrative Agent
     of the computations used by such accountants in determining, as of the end
     of such fiscal year, compliance with the covenants contained in Section
     5.04 and (iii) a certificate of the Senior Financial Officer (A) stating
     that no Default or Event of Default has occurred and is continuing or, if a
     Default or Event of Default has occurred and is continuing, a statement as
     to the nature thereof and the action that Terra has taken and proposes to
     take with respect thereto, (B) stating that since December 31, 1998, there
     has been no Material Adverse Change with respect to Terra and (C) providing
     a comparison between the financial position and results of operations set
     forth in such financial statements with the comparable information set
     forth in the
<PAGE>

                                      -79-

     financial projections and budget most recently delivered pursuant to
     Section 5.03(l) of the 1995 Terra Capital Credit Agreement or Section
     5.03(l).

          As soon as available and in any event within 110 days after the end of
     each fiscal year of the Borrower, the Borrower will furnish to the
     Administrative Agent, with sufficient copies for each Lender, a copy of the
     Consolidated balance sheet of the Borrower and its Subsidiaries as of the
     end of such fiscal year and Consolidated statements of income and cash
     flows of the Borrower and its Subsidiaries for such fiscal year, setting
     forth in each case in comparative form the corresponding figures for the
     preceding fiscal year in reasonable detail and duly certified by the Senior
     Financial Officer as having been prepared in accordance with GAAP,
     accompanied by a schedule prepared by Deloitte & Touche or other
     independent public accountants of nationally recognized standing in form
     satisfactory to the Administrative Agent setting forth the computations
     used by such accountants in determining, as of the end of such fiscal year,
     compliance with the covenants contained in Section 5.04.

          (d)  ERISA Events. Promptly and in any event within 10 Business Days
               ------------
     after any Obligor knows or has reason to know that any ERISA Event
     (including, for this purpose, a reportable event listed in Section
     4043(c)(7) of ERISA) with respect to any Obligor or any of its ERISA
     Affiliates has occurred, Terra will furnish to the Administrative Agent a
     statement of the Senior Financial Officer describing such ERISA Event and
     the action, if any, that such Obligor or such ERISA Affiliate has taken and
     proposes to take with respect thereto.

          (e)  Plan Terminations. Promptly and in any event within 10 Business
               -----------------
     Days after receipt thereof by any Obligor or any of its ERISA Affiliates,
     such Obligor will furnish to the Administrative Agent copies of each notice
     from the PBGC stating its intention to terminate any Plan of any Obligor or
     any of its ERISA Affiliates or to have a trustee appointed to administer
     any such Plan.

          (f)  Plan Annual Reports. Promptly and in any event within 30 days
               -------------------
     after the filing thereof with the Internal Revenue Service, each Obligor
     will furnish to the Administrative Agent copies of such Schedule B
     (Actuarial Information) to the annual report (Form 5500 Series) with
     respect to each Plan of each Obligor or any of its ERISA Affiliates that is
     then being maintained for employees or former employees of such Person.

          (g)  Multiemployer Plan Notices. Promptly and in any event within
               --------------------------
     five Business Days after receipt thereof by any Obligor or any of its ERISA
     Affiliates from the sponsor of a Multiemployer Plan of any Obligor or any
     of its ERISA Affiliates, such Obligor will furnish to the Administrative
     Agent copies of each notice concerning (i) the imposition of withdrawal
     liability by any such Multiemployer Plan, (ii) the reorganization or
     termination, within the meaning of Title IV of ERISA, of any such
     Multiemployer Plan or (iii) the amount of liability incurred, or that is
     reasonably expected to be incurred, by
<PAGE>

                                      -80-

     such Obligor or any of its ERISA Affiliates in connection with any event
     described in clause (i) or (ii).

          (h)  Litigation. Promptly after the commencement thereof, Terra will
               ----------
     furnish to the Administrative Agent notice of all actions, suits,
     investigations, litigation and proceedings before any court or governmental
     department, commission, board, bureau, agency or instrumentality, domestic
     or foreign, affecting any Obligor or any of its Subsidiaries of the type
     described in Section 4.01(h).

          (i)  Environmental Conditions. Promptly after receiving notice
               ------------------------
     thereof, Terra will furnish to the Administrative Agent notice of any
     condition or occurrence on any property of any Obligor that results in a
     material noncompliance by any Obligor or any of its Subsidiaries with any
     Environmental Law or Environmental Permit which noncompliance could
     reasonably be expected to have a Material Adverse Effect, or could (i) form
     the basis of an Environmental Action against any Obligor or any of its
     Subsidiaries or such property that could reasonably be expected to have a
     Material Adverse Effect or (ii) cause any such property to be subject to
     any restrictions on ownership, occupancy, use or transferability under any
     Environmental Law that could reasonably be expected to have Material
     Adverse Effect.

          (j)  Public Filings. Terra shall, promptly upon their becoming
               --------------
     available, deliver to the Administrative Agent and each Lender copies of
     all registration statements and regular periodic reports, if any, that
     Terra, the Company or TNCLP shall have filed with the Securities and
     Exchange Commission (or any governmental agency substituted therefor) or
     any national securities exchange.

          (k)  Shareholder Reports, Etc. Terra shall deliver to the
               -------------------------
     Administrative Agent and each Lender promptly upon the mailing thereof to
     the shareholders of Terra or TNCLP generally or to holders of Subordinated
     Indebtedness or 1995 Terra Debt generally, copies of all financial
     statements and proxy statements so mailed.

          (l)  Financial Projections and Budget. As soon as available and in
               --------------------------------
     any event within 110 days after the first day of each fiscal year of Terra,
     Terra will furnish to the Administrative Agent, with sufficient copies for
     each Lender, financial projections and a budget for such fiscal year and
     each subsequent fiscal year of Terra to and including the fiscal year in
     which the Advances are to mature, in each case in form and detail similar
     to the financial projections and budget delivered under Section 5.03(l) of
     the 1995 Terra Capital Credit Agreement.

          (m)  Other Information. Each Obligor shall furnish to the Lenders
               -----------------
     through the Administrative Agent such other information respecting the
     business, condition (financial or otherwise), operations, performance,
     properties or prospects of any Obligor or any of its Subsidiaries as the
     Administrative Agent or any Lender may from time to time reasonably
     request.
<PAGE>

                                      -81-

          (n)  Canadian Employee Benefit Plans. The Borrower shall provide to
               -------------------------------
     the Administrative Agent (with sufficient copies for each Lender) copies of
     each material report (including applicable schedules) with respect to each
     Canadian Employee Benefit Plan or any trust created thereunder as the
     Administrative Agent (or any Lender, through the Administrative Agent) may
     reasonably request.

          Section 5.04.  Financial Covenants. So long as any principal of or
                         -------------------
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of Credit shall be outstanding or any Lender shall
have any Commitment hereunder, Terra will:

          (a)  Debt to Cash Flow Ratio. Maintain the Debt to Cash Flow Ratio at
               -----------------------
     not more than the ratio set forth below for each Rolling Period ending in
     the respective periods set forth below:

<TABLE>
<CAPTION>
                         Each
                    Rolling Period
                       Ending In                  Ratio
                    --------------                -----
                    <S>                       <C>
                    June, 1999                6.30 to 1.00
                    September, 1999           8.80 to 1.00
                    December, 1999            9.20 to 1.00
                    March, 2000               9.50 to 1.00
                    June, 2000                7.50 to 1.00
                    September, 2000           7.00 to 1.00
                    December, 2000            6.50 to 1.00
                    March, June, September
                     and December of
                     fiscal year 2001         6.00 to 1.00
                    March, June, September
                     and December of
                     fiscal year 2002         4.50 to 1.00
</TABLE>

          (b)  Interest Coverage Ratio. Maintain the Interest Coverage Ratio at
               -----------------------
     not less than the ratio set forth below for each Rolling Period ending in
     the respective periods set forth below:

<TABLE>
<CAPTION>
                         Each
                    Rolling Period
                       Ending In                  Ratio
                    --------------                -----
                    <S>                           <C>
</TABLE>
<PAGE>

                                      -82-

<TABLE>
                    <S>                       <C>
                    June, 1999                1.00 to 1.00
                    September, 1999           1.00 to 1.00
                    December, 1999            1.10 to 1.00
                    March, 2000               1.10 to 1.00
                    June, 2000                1.40 to 1.00
                    September, 2000           1.40 to 1.00
                    December, 2000            1.40 to 1.00
                    March, 2001               1.40 to 1.00
                    June, 2001                2.00 to 1.00
                    September, 2001           2.00 to 1.00
                    December, 2001            2.00 to 1.00
                    March, June, September
                     and December of
                     fiscal year 2002         2.50 to 1.00
</TABLE>

                                  ARTICLE VI

                               EVENTS OF DEFAULT

          Section 6.01.  Events of Default. If any of the following events
                         -----------------
("Events of Default") shall occur and be continuing:
  -----------------

          (a)  the Borrower (i) shall fail to pay when due any principal of any
     Advance made to it or (ii) shall fail for three Business Days to pay when
     due any interest on any Advance made to it or any other amount payable by
     it under any Loan Document; or

          (b)  any representation or warranty made by any Obligor (or any of its
     officers) under or in connection with any Loan Document shall prove to have
     been incorrect in any material respect when made; or

          (c)  any Obligor shall fail to perform or observe any term, covenant
     or agreement contained in clause (n) of Section 5.01, or clause (a), (b),
     (c), (d), (e), (g), (i), (q) or (r) of Section 5.02, or clause (a), (e) or
     (i) of Section 5.03, or Section 5.04; or

          (d)  Terra shall fail to pay and perform its obligations under the
     Loan Purchase Agreement; or

          (e)  any Obligor shall fail to perform any other term, covenant or
     agreement contained in any Loan Document on its part to be performed or
     observed if such failure shall remain unremedied for a period of 30 days;
     or

          (f)  any Obligor or any of its Material Subsidiaries shall fail to pay
     any principal of, premium or interest on or any other amount payable in
     respect of any Debt that is outstanding in a principal or notional amount
     of at least $10,000,000 in the aggregate (but
<PAGE>

                                      -83-

     excluding Debt outstanding hereunder) of such Obligor or such Subsidiary
     (as the case may be), when the same becomes due and payable (whether by
     scheduled maturity, required prepayment, acceleration, demand or
     otherwise), and such failure shall continue after the applicable grace
     period, if any, specified in the agreement or instrument relating to such
     Debt; or any other event shall occur or condition shall exist under any
     agreement or instrument relating to any such Debt and shall continue after
     the applicable grace period, if any, specified in such agreement or
     instrument, if the effect of such event or condition is to accelerate, or
     to permit the acceleration of, the maturity of such Debt or otherwise to
     cause, or to permit the holder or holders (or an agent or trustee on its or
     their behalf) thereof to cause, such Debt to mature; or any such Debt shall
     be declared to be due and payable or required to be prepaid or redeemed
     (other than by a regularly scheduled required prepayment or redemption),
     purchased or defeased, or an offer to prepay, redeem, purchase or defease
     such Debt shall be required to be made, in each case prior to the stated
     maturity thereof; or

          (g)  any Obligor or any of its Material Subsidiaries shall generally
     not pay its debts as such debts become due, or shall admit in writing its
     inability to pay its debts generally, or shall make a general assignment
     for the benefit of creditors; or any proceeding shall be instituted by or
     against any Obligor or any of its Material Subsidiaries seeking to
     adjudicate it a bankrupt or insolvent, or seeking liquidation, winding up,
     reorganization, arrangement, adjustment, protection, relief, or composition
     of it or its debts or any similar relief in under any law relating to
     bankruptcy, insolvency or reorganization or relief of debtors, or seeking
     the entry of an order for relief or the appointment of a receiver,
     administrative receiver, trustee, liquidator, provisional liquidator,
     administrator, custodian, or other similar official for it or for any
     substantial part of its property and, in the case of any such proceeding
     instituted against it (but not instituted by it) that is being diligently
     contested by it in good faith, either such proceeding shall remain
     undismissed or unstayed for a period of 60 days or any of the actions
     sought in such proceeding (including, without limitation, the entry of an
     order for relief against, or the appointment of a receiver, trustee,
     custodian or other similar official for, it or any substantial part of its
     property) shall occur; or any Obligor or any of its Material Subsidiaries
     shall take any corporate or partnership action to authorize any of the
     actions set forth above in this subsection (g); or

          (h)  any judgment or order for the payment of money in excess of
     $10,000,000 shall be rendered against any Obligor or any of its Material
     Subsidiaries and either (i) enforcement proceedings shall have been
     commenced by any creditor upon such judgment or order or (ii) there shall
     be any period of 30 consecutive days during which a stay of enforcement of
     such judgment or order, by reason of a pending appeal or otherwise, shall
     not be in effect, unless such judgment or order shall have been vacated,
     satisfied or dismissed or bonded pending appeal; or

          (i)  any non-monetary judgment or order shall be rendered against any
     Obligor or any of its Subsidiaries that could be reasonably likely to have
     a Material Adverse Effect,
<PAGE>

                                      -84-

     and there shall be any period of 30 consecutive days during which a stay of
     enforcement of such judgment or order, by reason of a pending appeal or
     otherwise, shall not be in effect unless such judgment or order shall have
     been vacated, satisfied, discharged or bonded pending appeal; or

          (j)  any Security Document shall for any reason (other than pursuant
     to the terms hereof and thereof) cease to create a valid and perfected
     first priority Lien (subject only to Permitted Liens) on the Collateral
     purported to be covered thereby; or

          (k)  any ERISA Event shall have occurred with respect to a Plan of any
     Obligor or any of its ERISA Affiliates and the amount (determined as of the
     date of occurrence of such ERISA Event) of the Insufficiency of such Plan
     and the Insufficiency of any and all other Plans of the Obligors and their
     ERISA Affiliates with respect to which an ERISA Event shall have occurred
     and then exist (or the liability of the Obligors and their ERISA Affiliates
     related to such ERISA Event) could reasonably be expected to have a
     Material Adverse Effect; provided that with respect to any Multiple
                              --------
     Employer Plan, such Insufficiency shall include only the portion thereof
     attributable to such Obligor or its ERISA Affiliates; or

          (l)  any Obligor or any of its ERISA Affiliates shall have been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that it has incurred withdrawal liability to such
     Multiemployer Plan in an amount that, when aggregated with all other
     amounts required to be paid to Multiemployer Plans by the Obligors and
     their ERISA Affiliates as withdrawal liability (determined as of the date
     of such notification), could reasonably be expected to have a Material
     Adverse Effect; or

          (m)  any Obligor or any of its ERISA Affiliates shall have been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that such Multiemployer Plan is in reorganization or
     is being terminated, within the meaning of Title IV of ERISA, and as a
     result of such reorganization or termination the aggregate annual
     contributions of the Obligors and their ERISA Affiliates to all
     Multiemployer Plans that are then in reorganization or being terminated
     have been or will be increased over the amounts contributed to such
     Multiemployer Plans for the plan years of such Multiemployer Plans
     immediately preceding the plan year in which such reorganization or
     termination occurs by an amount that could reasonably be expected to have a
     Material Adverse Effect; or

          (n)  there shall have been asserted against Terra or any of its
     Subsidiaries an Environmental Claim that, in the judgment of the Required
     Lenders, is reasonably likely to be determined adversely to Terra or any of
     its Subsidiaries, and the amount thereof (either individually or in the
     aggregate) is reasonably likely to have a Material Adverse Effect (insofar
     as such amount is payable by Terra or any of its Subsidiaries but after
     deducting any portion thereof that is reasonably expected to be paid by
     other creditworthy Persons); or
<PAGE>

                                      -85-

          (o)  TI ceases to own directly all of the issued and outstanding
     shares of voting capital stock of the Borrower; or

          (p)  any license, consent, authorization, registration or approval at
     any time necessary to enable the Borrower or any of its Subsidiaries to
     comply with any of its obligations under this Agreement or any other Loan
     Document shall be revoked, withdrawn or withheld or shall be modified or
     amended in a manner prejudicial, in the opinion of the Required Lenders
     (acting reasonably), to the interests of the Lenders hereunder; or the
     Government of Canada, or any agency or political subdivision thereof, shall
     promulgate or declare effective any law, rule or regulation that, in the
     opinion of the Required Lenders, could have a Material Adverse Effect; or

          (q)  there shall have been asserted against the Borrower or any of its
     Subsidiaries any claims or liabilities in respect of any Canadian Employee
     Benefit Plans that, in the reasonable good faith judgment of the Required
     Lenders, could reasonably be likely to have a Material Adverse Effect;

then, and in any such event, the Administrative Agent shall at the request, or
may with the consent, of the Required Lenders, by notice to the Borrower,
declare the Advances and the Notes, all interest thereon and all other amounts
payable under this Agreement and the other Loan Documents to be forthwith due
and payable, whereupon the Advances and the Notes, all such interest and all
such amounts shall become and be forthwith due and payable, without presentment,
demand, protest or further notice of any kind, all of which are hereby expressly
waived by the Borrower; provided that in the event of an actual or deemed entry
                        --------
of an order for relief with respect to any Obligor or any of its Subsidiaries
under the Federal Bankruptcy Code, or any Event of Default under paragraph (f)
above with respect to the Borrower shall occur, the Advances and the Notes, all
such interest and all such amounts shall automatically become and be due and
payable, without presentment, demand, protest or any notice of any kind, all of
which are hereby expressly waived by the Borrower.

                                  ARTICLE VII

                           THE ADMINISTRATIVE AGENT

          Section 7.01.  Authorization and Action. Each Lender hereby appoints
                         ------------------------
and authorizes the Administrative Agent to take such action as agent on its
behalf and to exercise such powers and discretion under this Agreement and the
other Basic Documents as are delegated to the Administrative Agent by the terms
hereof and thereof, together with such powers and discretion as are reasonably
incidental thereto. As to any matters not expressly provided for by the Basic
Documents, including, without limitation, enforcement or collection of the
Notes, the Administrative Agent shall not be required to exercise any discretion
or take any action, and shall not be required to act or to refrain from acting
(and shall be fully protected in so acting or refraining from acting) except
upon the instructions of the Required Lenders, and such
<PAGE>

                                      -86-

instructions shall be binding upon all Lenders and all holders of the Notes;
provided that the Administrative Agent shall not be required to take any action
- --------
that exposes it to personal liability or that is contrary to this Agreement or
applicable law. The Administrative Agent agrees to give to each Lender prompt
notice of each notice given to it by the Borrower or Terra pursuant to the terms
of this Agreement. The parties hereto acknowledge and agree that neither Bank of
America National Trust and Savings Association nor The Bank of Nova Scotia shall
have any rights or obligations in their respective capacities as Syndication
Agents hereunder. No party designated on the signature pages hereof as a
"Syndication Agent" shall have any liability or responsibility whatsoever
hereunder in such capacity.

          Each Lender:

          (1)  hereby authorizes the Administrative Agent to execute and deliver
     the documents referred to in clauses (d) and (s) of Section 3.01, and each
     Lender agrees that it is bound by the Security Documents as if such Lender
     were a signatory thereto;

          (2)  hereby authorizes the Administrative Agent to execute and deliver
     a Confirmation of Loan Purchase Agreement in substantially the form of
     Exhibit E, and each Lender agrees that it is bound by the Loan Purchase
     Agreement as if such Lender were a signatory thereto; and

          (3)  hereby authorizes the Collateral Agent to execute and deliver the
     documents referred to in clauses (d) and (s) of Section 3.01.

          Section 7.02.  Administrative Agent's Reliance, Etc. Neither the
                         -------------------------------------
Administrative Agent nor any of its respective directors, officers, agents or
employees shall be liable for any action taken or omitted to be taken by it or
them under or in connection with the Basic Documents, except for its or their
own gross negligence or willful misconduct. Without limitation of the generality
of the foregoing, the Administrative Agent (i) may treat the payee of any Note
as the holder thereof until the Administrative Agent receives and accepts an
Assignment and Acceptance entered into by the Lender that is the payee of such
Note, as assignor, and an Eligible Assignee, as assignee, as provided in Section
9.07; (ii) may consult with legal counsel (including counsel for any Obligor),
independent public accountants and other experts selected by it and shall not be
liable for any action taken or omitted to be taken in good faith by them in
accordance with the advice of such counsel, accountants or experts; (iii) makes
no warranty or representation to any Lender and shall not be responsible to any
of them for any statements, warranties or representations made in or in
connection with the Loan Documents; (iv) shall not have any duty to ascertain or
to inquire as to the performance or observance of any of the terms, covenants or
conditions of any Loan Document on the part of any Obligor or to inspect the
property (including the books and records) of any Obligor; (v) shall not be
responsible to any Lender for the due execution, legality, validity,
enforceability, genuineness, sufficiency or value of any Basic Document or any
other instrument or document furnished pursuant hereto; and (vi) shall incur no
liability under or in respect of any Basic Document by acting upon any notice,
consent, certificate or other instrument or writing (which may be by
<PAGE>

                                      -87-

telegram, telecopy, cable or telex) believed by it to be genuine and signed or
sent by the proper party or parties.

          Section 7.03.  Citibank and Affiliates. With respect to the Advances
                         -----------------------
made by it and the Note issued to it, Citibank shall have the same rights and
powers under the Basic Documents as any other Lender and may exercise the same
as though it were not the Administrative Agent or the Collateral Agent; and the
term "Lender" or "Lenders" shall, unless otherwise expressly indicated, include
Citibank in its individual capacity. Citibank and its Affiliates may accept
deposits from, lend money to, act as trustee under indentures for, accept
investment banking engagements from and generally engage in any kind of business
with, any Obligor, any of its Subsidiaries, any of its Affiliates and any Person
who may do business with or own securities of any Obligor or any such Subsidiary
or Affiliate, all as if Citibank were not the Administrative Agent and without
any duty to account therefor to the Lenders.

          Section 7.04.  Lender Credit Decision. Each Lender acknowledges that
          -------        ----------------------
it has, independently and without reliance upon the Administrative Agent or any
other Lender and based on the financial statements referred to in Section 4.01
and such other documents and information as it has deemed appropriate, made its
own credit analysis and decision to enter into this Agreement. Each Lender also
acknowledges that it will, independently and without reliance upon the
Administrative Agent or any other Lender and based on such documents and
information as it shall deem appropriate at the time, continue to make its own
credit decisions in taking or not taking action under this Agreement.

          Section 7.05.  Indemnification. The Lenders agree to indemnify the
                         ---------------
Administrative Agent (to the extent not promptly reimbursed by the Borrower),
ratably according to the principal amounts of the Notes then held by each of
them, from and against any and all liabilities, obligations, losses, damages,
penalties, actions, judgments, suits, costs, expenses or disbursements of any
kind or nature whatsoever that may be imposed on, incurred by, or asserted
against any of them in any way relating to or arising out of the Basic Documents
or any action taken or omitted by any of them under the Basic Documents;
provided that no Lender shall be liable for any portion of such liabilities,
- --------
obligations, losses, damages, penalties, actions, judgments, suits, costs,
expenses or disbursements resulting from the gross negligence or willful
misconduct of the Administrative Agent. Without limitation of the foregoing,
each Lender agrees to reimburse (x) the Administrative Agent promptly upon
demand for its ratable share of any costs and expenses payable by the Borrower
under Section 9.04 of this Agreement and (y) the Collateral Agent under the
Terra Capital Security Documents, in each case to the extent that the
Administrative Agent or the Collateral Agent, as the case may be, is not
promptly reimbursed for such costs and expenses by the Borrower.

          Section 7.06.  Collateral Duties.
                         -----------------

          (a)  Except for action expressly required of the Administrative Agent
hereunder and under the other Basic Documents, the Administrative Agent shall in
all cases be fully justified in refusing to act hereunder and thereunder unless
it shall be further indemnified to its
<PAGE>

                                      -88-

satisfaction by the Lenders proportionately in accordance with the Obligations
then due and payable to each of them against any and all liability and expense
that may be incurred by it by reason of taking or continuing to take any such
action.

          (b)  Except as expressly provided herein, the Administrative Agent
shall have no duty to take any affirmative steps with respect to the collection
of amounts payable in respect of the Collateral. The Administrative Agent shall
incur no liability as a result of any private sale of the Collateral.

          (c)  The Lenders hereby consent, and agree upon written request by the
Collateral Agent or the Administrative Agent to execute and deliver such
instruments and other documents as the Collateral Agent or Administrative Agent
may deem desirable to confirm such consent, to the release of the Liens on any
of the Collateral, including any release in connection with any sale, transfer
or other disposition of the Collateral or any part thereof in accordance with
the Basic Documents.

          (d)  The parties hereto acknowledge that each of the Collateral Agent
and the Administrative Agent shall be deemed to have exercised reasonable care
in the custody and preservation of the Collateral in its possession if the
Collateral is accorded treatment substantially equal to that which the
Collateral Agent or the Administrative Agent, as the case may be, accords its
own property, it being understood that none of the Collateral Agent, the
Administrative Agent or any Lender shall have responsibility for (a)
ascertaining or taking action with respect to calls, conversions, exchanges,
maturities, tenders or other matters relative to any Collateral, whether or not
the Collateral Agent, Administrative Agent or any Lender has or is deemed to
have knowledge of such matters, or (b) taking any necessary steps to preserve
rights against any parties with respect to any Collateral.

          Section 7.07.  Successor Administrative Agent. The Administrative
                         ------------------------------
Agent may resign at any time by giving written notice thereof the Lenders and
the Borrower and may be removed at any time with or without cause by the
Required Lenders. Upon any such resignation or removal, the Required Lenders
shall have the right to appoint (subject, so long as no Default or Event of
Default has occurred and is continuing, to the consent of the Borrower, which
consent shall not be unreasonably withheld) a successor Administrative Agent. If
no successor Administrative Agent shall have been so appointed by the Required
Lenders, and shall have accepted such appointment, within 30 days after the
retiring Administrative Agent's giving of notice of resignation or the Required
Lenders' removal of the Administrative Agent, as the case may be, then the
retiring Administrative Agent may, on behalf of the Lenders, appoint (subject,
so long as no Default or Event of Default has occurred and is continuing, to the
consent of the Borrower, which consent shall not be unreasonably withheld) a
successor Administrative Agent, which shall be an Initial Lender or a commercial
bank organized under the laws of the United States or of any State thereof and
having a combined capital and surplus of at least $500,000,000. Upon the
acceptance of any appointment as Administrative Agent hereunder by a successor
Administrative Agent such successor Administrative Agent shall succeed to and
become vested with all the rights, powers, discretion, privileges and duties of
the retiring
<PAGE>

                                      -89-

Administrative Agent, as the case may be, and such retiring Administrative Agent
shall be discharged from its duties and obligations under the Basic Documents.
After any retiring Administrative Agent's resignation or removal hereunder as
Administrative Agent, the provisions of this Article VII shall inure to the
benefit of the Administrative Agent as to any actions taken or omitted to be
taken by it while it was Administrative Agent under this Agreement and under the
Security Documents.

                                 ARTICLE VIII

                                 THE GUARANTEE

          Section 8.01.  The Guarantee. The Guarantors hereby jointly and
                         -------------
severally guarantee to each Lender and the Administrative Agent and their
respective successors and assigns the prompt payment in full when due (whether
at stated maturity, by acceleration or otherwise) of the principal of and
interest on the Advances made by the Lenders to, and the Notes held by each
Lender of, the Borrower and all other amounts from time to time owing to the
Lenders or the Administrative Agent by the Borrower under this Agreement and
under the Notes and by any Obligor under any of the other Loan Documents, in
each case strictly in accordance with the terms thereof (such obligations being
herein collectively called the "Guaranteed Obligations"). The Guarantors hereby
                                ----------------------
further jointly and severally agree that if the Borrower shall fail to pay in
full when due (whether at stated maturity, by acceleration or otherwise) any of
the Guaranteed Obligations, the Guarantors will promptly pay the same, without
any demand or notice whatsoever, and that in the case of any extension of time
of payment or renewal of any of the Guaranteed Obligations, the same will be
promptly paid in full when due (whether at extended maturity, by acceleration or
otherwise) in accordance with the terms of such extension or renewal.

          Section 8.02.  Obligations Unconditional.
                         -------------------------

          (a)  The obligations of the Guarantors under Section 8.01 are absolute
and unconditional, joint and several, irrespective of the value, genuineness,
validity, regularity or enforceability of the obligations of the Borrower under
this Agreement, the Notes or any other agreement or instrument referred to
herein or therein, or any substitution, release or exchange of any other
guarantee of or security for any of the Guaranteed Obligations, and, to the
fullest extent permitted by applicable law, irrespective of any other
circumstance whatsoever that might otherwise constitute a legal or equitable
discharge or defense of a surety or guarantor, it being the intent of this
Section 8.02 that the obligations of the Guarantors hereunder shall be absolute
and unconditional, joint and several, under any and all circumstances.

          (b)  Without limiting the generality of the foregoing clause (a), it
is agreed that the occurrence of any one or more of the following shall not
alter or impair the liability of the Guarantors hereunder which shall remain
absolute and unconditional as described above:
<PAGE>

                                      -90-

          (i)   at any time or from time to time, without notice to the
     Guarantors, the time for any performance of or compliance with any of the
     Guaranteed Obligations shall be extended, or such performance or compliance
     shall be waived;

          (ii)  any of the acts mentioned in any of the provisions of this
     Agreement or the Notes or any other agreement or instrument referred to
     herein or therein shall be done or omitted;

          (iii) the maturity of any of the Guaranteed Obligations shall be
     accelerated, or any of the Guaranteed Obligations shall be modified,
     supplemented or amended in any respect, or any right under this Agreement
     or the Notes or any other agreement or instrument referred to herein or
     therein shall be waived or any other guarantee of any of the Guaranteed
     Obligations or any security therefor shall be released or exchanged in
     whole or in part or otherwise dealt with; or

          (iv)  any lien or security interest granted to, or in favor of, the
     Administrative Agent or any Lender as security for any of the Guaranteed
     Obligations shall fail to be perfected.

The Guarantors hereby expressly waive diligence, presentment, demand of payment,
protest and all notices whatsoever, and any requirement that the Administrative
Agent or any Lender exhaust any right, power or remedy or proceed against the
Borrower under this Agreement or the Notes or any other agreement or instrument
referred to herein or therein, or against any other Person under any other
guarantee of, or security for, any of the Guaranteed Obligations.

          Section 8.03.  Reinstatement. The obligations of the Guarantors under
                         -------------
this Article VIII shall be automatically reinstated if and to the extent that
for any reason any payment by or on behalf of the Borrower in respect of the
Guaranteed Obligations is rescinded or must be otherwise restored by any holder
of any of the Guaranteed Obligations, whether as a result of any proceedings in
bankruptcy or reorganization or otherwise, and the Guarantors jointly and
severally agree that they will indemnify the Administrative Agent and each
Lender on demand for all reasonable costs and expenses (including, without
limitation, fees of counsel) incurred by the Administrative Agent or such Lender
in connection with such rescission or restoration, including any such costs and
expenses incurred in defending against any claim alleging that such payment
constituted a preference, fraudulent transfer or similar payment under any
bankruptcy, insolvency or similar law.

          Section 8.04.  Subrogation. To the extent that, as a result of this
                         -----------
Article VIII, any Lender would be subject to an extended preference period under
Section 547 of the Bankruptcy Code (or any similar provisions under any other
applicable law), each Guarantor hereby waives all rights of subrogation, whether
arising by contract or operation of law (including, without limitation, any such
right arising under the Bankruptcy Code) or otherwise, by reason of any payment
by it pursuant to the provisions of this Article VIII and agrees with the
Borrower for the benefit of each of its creditors (including, without
limitation, each Lender and the Administrative
<PAGE>

                                      -91-

Agent) that any such payment by it shall constitute a contribution of capital by
such Guarantor to the Borrower (or an investment in the equity capital of the
Borrower by such Guarantor).

          Section 8.05.  Remedies. The Guarantors jointly and severally agree
                         --------
that, as between the Guarantors and the Lenders, the obligations of the Borrower
under this Agreement and the Notes may be declared to be forthwith due and
payable as provided in Article VI (and shall be deemed to have become
automatically due and payable in the circumstances provided in said Article VI)
for purposes of Section 8.01 notwithstanding any stay, injunction or other
prohibition preventing such declaration (or such obligations from becoming
automatically due and payable) as against the Borrower and that, in the event of
such declaration (or such obligations being deemed to have become automatically
due and payable), such obligations (whether or not due and payable by the
Borrower) shall forthwith become due and payable by the Guarantors for purposes
of said Section 8.01.

          Section 8.06.  Instrument for the Payment of Money. Each Guarantor
                         -----------------------------------
hereby acknowledges that the guarantee in this Article VIII constitutes an
instrument for the payment of money, and consents and agrees that any Lender or
the Administrative Agent, at its sole option, in the event of a dispute by such
Guarantor in the payment of any moneys due hereunder, shall have the right to
bring motion-action under New York CPLR Section 3213.

          Section 8.07.  Continuing Guarantee. The guarantee in this Article
                         --------------------
VIII is a continuing guarantee, and shall apply to all Guaranteed Obligations
whenever arising.

          Section 8.08.  Rights of Contribution. The Guarantors hereby agree, as
                         ----------------------
between themselves, that if any Subsidiary Guarantor shall become an Excess
Funding Guarantor (as defined below) by reason of the payment by such Subsidiary
Guarantor of any Guaranteed Obligations, each other Subsidiary Guarantor shall,
on demand of such Excess Funding Guarantor (but subject to the next sentence),
pay to such Excess Funding Guarantor an amount equal to such Subsidiary
Guarantor's Pro Rata Portion (as defined below and determined, for this purpose,
without reference to the properties, debts and liabilities of such Excess
Funding Guarantor) of the Excess Payment (as defined below) in respect of such
Guaranteed Obligations. The payment obligation of a Subsidiary Guarantor to any
Excess Funding Guarantor under this Section 8.08 shall be subordinate and
subject in right of payment to the prior payment in full of the obligations of
such Subsidiary Guarantor under the other provisions of this Article VIII and
such Excess Funding Guarantor shall not exercise any right or remedy with
respect to such excess until payment and satisfaction in full of all of such
obligations.

          For purposes of this Section 8.08, (i) "Excess Funding Guarantor"
                                                  ------------------------
shall mean, in respect of any Guaranteed Obligations, a Subsidiary Guarantor
that has paid an amount in excess of its Pro Rata Portion of such Guaranteed
Obligations, (ii) "Excess Payment" shall mean, in respect of any Guaranteed
                   --------------
Obligations, the amount paid by an Excess Funding Guarantor in excess of its Pro
Rata Portion of such Guaranteed Obligations and (iii) "Pro Rata Portion" shall
                                                       ----------------
mean, for any Subsidiary Guarantor, the ratio (expressed as a percentage) of (x)
the amount by which the aggregate present fair saleable value of all properties
of such Subsidiary Guarantor
<PAGE>

                                      -92-

(excluding any shares of stock of any other Subsidiary Guarantor) exceeds the
amount of all the debts and liabilities of such Subsidiary Guarantor (including
contingent, subordinated, unmatured and unliquidated liabilities, but excluding
the obligations of such Subsidiary Guarantor hereunder and any obligations of
any other Subsidiary Guarantor that have been Guaranteed by such Subsidiary
Guarantor) to (y) the amount by which the aggregate fair saleable value of all
properties of the Company and all of the Subsidiary Guarantors exceeds the
amount of all the debts and liabilities (including contingent, subordinated,
unmatured and unliquidated liabilities, but excluding the obligations of the
Company and the Subsidiary Guarantors hereunder) of the Company and all of the
Subsidiary Guarantors, all as of the Restatement Date. If any Subsidiary becomes
a Subsidiary Guarantor hereunder subsequent to the Restatement Date, then for
purposes of this Section 8.08 such subsequent Subsidiary Guarantor shall be
deemed to have been a Subsidiary Guarantor as of the Restatement Date and the
aggregate present fair saleable value of the properties, and the amount of the
debts and liabilities, of such Subsidiary Guarantor as of the Restatement Date
shall be deemed to be equal to such value and amount on the date such Subsidiary
Guarantor becomes a Subsidiary Guarantor hereunder.

          Section 8.09.  General Limitation on Guarantee Obligations. In any
                         -------------------------------------------
action or proceeding involving any state corporate law, or any state or Federal
bankruptcy, insolvency, reorganization or other law affecting the rights of
creditors generally, if the obligations of any Guarantor under Section 8.01
would otherwise, taking into account the provisions of Section 8.08, be held or
determined to be void, invalid or unenforceable, or subordinated to the claims
of any other creditors, on account of the amount of its liability under said
Section 8.01, then, notwithstanding any other provision hereof to the contrary,
the amount of such liability shall, without any further action by such
Guarantor, any Lender, the Administrative Agent or any other Person, be
automatically limited and reduced to the highest amount that is valid and
enforceable and not subordinated to the claims of other creditors as determined
in such action or proceeding.

                                  ARTICLE IX

                                 MISCELLANEOUS

          Section 9.01.  Amendments, Consents, Etc.
                         --------------------------

          (a)  No amendment or waiver of any provision of this Agreement, the
Notes or the other Basic Documents, nor any consent to any departure by any
Obligor from any provision of this Agreement, the Notes or the other Basic
Documents, shall in any event be effective unless the same shall be in writing
and signed by the Required Lenders, and then such waiver or consent shall be
effective only in the specific instance and for the specific purpose for which
given; provided that:
       --------

           (i)  no amendment, waiver or consent shall, unless in writing and
     signed by all the Lenders, do any of the following:
<PAGE>

                                      -93-

                    (1)  waive any of the conditions specified in Section 3.01;

                    (2)  change the percentage of the aggregate unpaid principal
          amount of the Advances, or the number or percentage of Lenders, that
          shall be required for the Lenders or any of them to take any action
          hereunder;

                    (3)  amend this Section 9.01;

                    (4)  reduce the principal of, or interest on, the Notes or
          any fees or other amounts payable hereunder;

                    (5)  postpone any date fixed for any payment of principal
          of, or interest on, the Notes or any fees or other amounts payable
          hereunder or amend Section 2.03 or 2.05;

                    (6)  release any Guarantor from its obligations under
          Article VIII; or

                    (7)  amend, modify or supplement the Intercreditor
          Agreement;

          (ii)  no amendment, waiver or consent shall, unless in writing and
     signed by the Required Lenders and each Lender that would be adversely
     affected by such amendment, waiver or consent:

                    (1)  subject such Lender to any additional obligations;

                    (2)  reduce the principal of, or interest on, the Notes held
          by such Lender or any fees or other amounts payable hereunder to such
          Lender;

                    (3)  postpone any date fixed for any payment of principal
          of, or interest on, the Notes held by such Lender or any fees or other
          amounts payable hereunder to such Lender; or

                    (4)  change the order of application of any prepayment set
          forth in Section 2.05 in any manner that materially affects such
          Lender; and

          (iii) no amendment, waiver or consent shall, unless in writing and
     signed by the Administrative Agent in addition to the Lenders required
     above to take such action, affect the rights or duties of the
     Administrative Agent under this Agreement, any Note or any other Basic
     Document.

          (b)   Except as otherwise provided in the Security Documents or the
Intercreditor Agreement, the Administrative Agent shall not consent to release
any Collateral or terminate any Lien under any Security Document unless such
release or termination shall be consented to in
<PAGE>

                                      -94-

writing by Lenders owed or holding in the aggregate at least 75% of the then
aggregate unpaid principal amount of the Advances; provided that:
                                                   --------

          (1)  the consent of all Lenders shall be required to release all or
     substantially all of the Collateral, except upon the termination of the
     Liens created by each of the Security Documents in accordance with the
     terms thereof; and

          (2)  no such consent shall be required to release any Lien covering
     property that is the subject of a disposition of property permitted
     hereunder and, upon such a permitted disposition, such property shall be
     deemed to be transferred free and clear of the Lien of the Security
     Documents without any action on the part of any party (and the
     Administrative Agent is hereby authorized to execute such releases and
     other documents, and to take such other action, as the Company may
     reasonably request to give effect thereto).

          Section 9.02.  Notices, Etc. All notices and other communications
                         -------------
provided for hereunder shall be in writing (including telecopy communication)
and mailed, telecopied or delivered:

          (a)  if to any Obligor, care of Terra Industries Inc., 600 Fourth
     Street, Sioux City, Iowa 51102, Attention: Francis G. Meyer, Senior Vice
     President and Chief Financial Officer, telephone number (712) 279-8790;
     telecopier number (712) 279-8703;

          (b)  if to any Lender, to it at its address (or telecopy number) set
     forth in its Administrative Questionnaire;

          (c)  if to the Administrative Agent, at its address at 2 Penns Way,
     Suite 200, New Castle, Delaware, 19720, Attention: Jacqueline Roman (or her
     successor), telephone number (302) 894-6007, telecopier number (302) 894-
     6120, with a copy to Citibank, N.A., 399 Park Avenue, New York, New York
     10043, Attention: Jim Simpson, telephone number 212-559-7773, telecopier
     number 212-826-2371;

or, as to each party, at such other address as shall be designated by such party
in a written notice to the other parties. All such notices and communications
shall, when mailed or telecopied, be effective when deposited in the mails or
transmitted by telecopier, respectively, except that notices and communications
to the Administrative Agent pursuant to Article II, III or VII shall not be
effective until received by the Administrative Agent.

          Section 9.03.  No Waiver; Remedies. No failure on the part of any
                         -------------------
Lender or the Administrative Agent to exercise, and no delay in exercising, any
right hereunder or under any Note shall operate as a waiver thereof; nor shall
any single or partial exercise of any such right preclude any other or further
exercise thereof or the exercise of any other right. The remedies herein
provided are cumulative and not exclusive of any remedies provided by law.
<PAGE>

                                      -95-

          Each Obligor irrevocably waives, to the fullest extent permitted by
applicable law, any claim that any action or proceeding commenced by the
Administrative Agent or any Lender relating in any way to this Agreement should
be dismissed or stayed by reason, or pending the resolution, of any action or
proceeding commenced by any Obligor relating in any way to this Agreement
whether or not commenced earlier. To the fullest extent permitted by applicable
law, the Obligors shall take all measures necessary for any such action or
proceeding commenced by the Administrative Agent or any Lender to proceed to
judgment prior to the entry of judgment in any such action or proceeding
commenced by any Obligor.

          Section 9.04.  Costs, Expenses and Indemnification.
                         -----------------------------------

          (a)  The Borrower agrees to pay on demand (i) all costs and expenses
of the Administrative Agent and the Lenders in connection with the preparation,
execution, delivery, administration, modification and amendment of the Basic
Documents including, without limitation, (A) all due diligence, syndication
(including printing, distribution and bank meetings), transportation, computer,
duplication, appraisal, insurance, consultant, search, filing and recording fees
and expenses, ongoing audit expenses and all other reasonable out-of-pocket
expenses incurred by the Administrative Agent (including the reasonable and
documented fees and expenses of Milbank, Tweed, Hadley & McCloy LLP, special New
York counsel to Citibank, and Blake, Cassels & Graydon, special Canadian counsel
to the Administrative Agent, but not, under this clause (A) or clause (B) below,
of any other counsel) whether or not any of the transactions contemplated by
this Agreement are consummated, (B) the reasonable and documented fees and
expenses of counsel for the Administrative Agent with respect thereto, with
respect to advising the Administrative Agent as to its rights and
responsibilities, or the perfection, protection or preservation of rights or
interests, under the Basic Documents, and (C) with respect to negotiations with
any Obligor or with other creditors of any Obligor or any of its Subsidiaries
arising out of any Default or Event of Default or any events or circumstances
that may reasonably be expected to give rise to a Default or Event of Default
and with respect to presenting claims in or otherwise participating in or
monitoring any bankruptcy, insolvency or other similar proceeding involving
creditors' rights generally and any proceeding ancillary thereto) and (ii) all
costs and expenses of the Administrative Agent and the Lenders in connection
with the enforcement of the Basic Documents, whether in any action, suit or
litigation, any bankruptcy, insolvency or other similar proceeding affecting
creditors' rights generally or otherwise (including, without limitation, the
reasonable and documented fees and expenses of counsel for the Administrative
Agent and each Lender with respect thereto).

          (b)  The Borrower agrees to indemnify and hold harmless the
Administrative Agent and each Lender and each of their Affiliates and their
officers, directors, employees, agents and advisors (each, an "Indemnified
                                                               -----------
Party") from and against any and all claims, damages, losses, liabilities and
- -----
expenses (including, without limitation, reasonable fees and expenses of
counsel) that may be incurred by or asserted or awarded against any Indemnified
Party, in each case arising out of or in connection with or by reason of, or in
connection with the preparation for a defense of, any investigation, litigation
or proceeding arising out of, related to or in connection with the U.K. Nitrogen
Acquisition or the actual or alleged presence of
<PAGE>

                                      -96-

Hazardous Materials on any property owned by an Obligor or any Environmental
Action relating in any way to any Obligor or any of its Subsidiaries, in each
case whether or not such investigation, litigation or proceeding is brought by
any Obligor, its directors, shareholders or creditors or an Indemnified Party or
any Indemnified Party is otherwise a party thereto and whether or not the U.K.
Nitrogen Acquisition or the other transactions contemplated hereby are
consummated, except to the extent such claim, damage, loss, liability or expense
is found in a final, non-appealable judgment by a court of competent
jurisdiction to have resulted from such Indemnified Party's gross negligence or
willful misconduct. The Borrower also agrees not to assert any claim against the
Administrative Agent any Lender, any of their Affiliates, or any of their
respective directors, officers, employees, attorneys and agents, on any theory
of liability, for special, indirect, consequential or punitive damages arising
out of or otherwise relating to the U.K. Nitrogen Acquisition or any part
thereof or the other transactions contemplated herein or in any other Basic
Document or the actual or proposed use of the proceeds of the Advances. For
purposes of this Section 9.04(b), the term "non-appealable" includes any
judgment as to which all appeals have been taken or as to which the time for
taking an appeal shall have expired.

          (c)  If any payment of principal of, or Conversion of, any Eurodollar
Rate Advance is made by the Borrower to or for the account of a Lender other
than on the last day of the Interest Period for such Advance, as a result of a
payment or Conversion pursuant to Section 2.03, 2.05, 2.07(b)(i) or 2.08(d) or
as the result of acceleration of the maturity of the Notes pursuant to Section
6.01 or for any other reason, the Borrower shall, upon demand by such Lender
(with a copy of such demand to the Administrative Agent), pay to the
Administrative Agent for the account of such Lender any amounts required to
compensate such Lender for any additional losses, costs or expenses that it may
reasonably incur as a result of such payment, including, without limitation, any
loss (including loss of anticipated profits), cost or expense incurred by reason
of the liquidation or reemployment of deposits or other funds acquired by any
Lender to fund or maintain such Advance.

          (d)  If any Obligor fails to pay when due any costs, expenses or other
amounts payable by it under any Loan Document, including, without limitation,
reasonable and documented fees and expenses of counsel and indemnities, such
amount may be paid on behalf of such Obligor by the Administrative Agent or any
Lender, in its sole discretion.

          Section 9.05.  Right of Setoff. Upon (a) the occurrence and during the
                         ---------------
continuance of any Event of Default and (b) the making of the request or the
granting of the consent specified by Section 6.01 to authorize the
Administrative Agent to declare the Notes due and payable pursuant to the
provisions of Section 6.01, each Lender is hereby authorized at any time and
from time to time, to the fullest extent permitted by law, to set off and
otherwise apply any and all deposits (general or special, time or demand,
provisional or final) at any time held and other indebtedness at any time owing
by such Lender to or for the credit or the account of the Borrower against any
and all of the Obligations of the Borrower now or hereafter existing under this
Agreement and the Note held by such Lender, irrespective of whether such Lender
shall have made any demand under this Agreement or such Note and although such
obligations may be unmatured. Each Lender agrees promptly to notify the Borrower
after any such setoff
<PAGE>

                                      -97-

and application; provided that the failure to give such notice shall not affect
                 --------
the validity of such setoff and application. The rights of each Lender under
this Section are in addition to other rights and remedies (including, without
limitation, other rights of setoff) that such Lender may have.

          Section 9.06.  Jurisdiction, Service of Process and Venue.
                         ------------------------------------------

          (a)  This Agreement and the Notes shall be governed by, and construed
in accordance with, the law of the State of New York. Each party hereto hereby
agrees that any suit, action or proceeding with respect to this Agreement, the
Notes the other Loan Documents or any judgment entered by any court in respect
thereof may be brought in the United States District Court for the Southern
District of New York, in the Supreme Court of the State of New York sitting in
New York County (including its Appellate Division), or in any other appellate
court in the State of New York, as the party commencing such suit, action or
proceeding may elect in its sole discretion; and each party hereto hereby
irrevocably submits to the jurisdiction of such courts for the purpose of any
such suit, action, proceeding or judgment. Each party hereto further submits,
for the purpose of any such suit, action, proceeding or judgment brought or
rendered against it, to the appropriate courts of the jurisdiction of its
domicile.

          (b)  Each of the Borrower and the Subsidiary Guarantors hereby agrees
that service of all writs, process and summonses in any such suit, action or
proceeding brought in the State of New York may be made upon Corporation Service
Company, presently located at 80 State Street, Albany, New York 12207, U.S.A.
(the "New York Process Agent"), and each of the Borrower and the Subsidiary
      ----------------------
Guarantor hereby confirms and agrees that the New York Process Agent has been
duly and irrevocably appointed as its agent and true and lawful attorney-in-fact
in its name, place and stead to accept such service of any and all such writs,
process and summonses, and agrees that the failure of the New York Process Agent
to give any notice of any such service of process to the Borrower and the
Subsidiary Guarantor, as the case may be, shall not impair or affect the
validity of such service or of any judgment based thereon. Each of the Borrower
and the Subsidiary Guarantor hereby further irrevocably consents to the service
of process in any suit, action or proceeding in said courts by the mailing
thereof by the Administrative Agent or any Lender by registered or certified
mail, postage prepaid, at its address specified in Section set forth beneath its
signature hereto.

          (c)  Nothing herein shall in any way be deemed to limit the ability of
the Administrative Agent or the Lenders to serve any such writs, process or
summonses in any other manner permitted by applicable law or to obtain
jurisdiction over the Borrower or the Subsidiary Guarantor in such other
jurisdictions, and in such manner, as may be permitted by applicable law.

          (d)  Each of the Obligors hereby irrevocably waives any objection that
it may now or hereafter have to the laying of the venue of any suit, action or
proceeding arising out of or relating to this Agreement or any other Loan
Document brought in the Supreme Court of the State of New York, County of New
York or in the United States District Court for the Southern
<PAGE>

                                      -98-

District of New York, and hereby further irrevocably waives any claim that any
such suit, action or proceeding brought in any such court has been brought in an
inconvenient forum.

          Section 9.07.  Assignments and Participations.
                         ------------------------------

          (a)   Each Lender may assign to one or more banks or other entities
all or a portion of its rights and obligations under this Agreement (including,
without limitation, all or a portion of the Advances owing to it and the Note or
Notes held by it); provided that:
                   --------

          (i)   except in the case of an assignment to a Person that,
     immediately prior to such assignment, was a Lender or an affiliate of a
     Lender or an assignment of all of a Lender's rights and obligations under
     this Agreement, the amount of the Advances of the assigning Lender being
     assigned pursuant to each such assignment (determined as of the date of the
     Assignment and Acceptance with respect to such assignment) shall in no
     event be less than the lesser of (x) such Lender's Advances hereunder and
     (y) $5,000,000 or an integral multiple of $1,000,000 in excess thereof
     (except as otherwise agreed by the Borrower and the Administrative Agent),

          (ii)  except in the case of an assignment to a Person that,
     immediately prior to such assignment, was a Lender or an affiliate of a
     Lender, each such assignment shall be made only upon the prior written
     approval of the Borrower and the Administrative Agent, such approval not to
     be unreasonably withheld,

          (iii) each such assignment shall be to an Eligible Assignee,

          (iv)  each such assignment by a Lender of its Advances or Note shall
     be made in such manner so that the same portion of its Advances and Note is
     assigned to the respective assignee,

          (v)   the parties to each such assignment shall execute and deliver to
     the Administrative Agent, for its acceptance and recording in the Register,
     an Assignment and Acceptance, together with any Note or Notes subject to
     such assignment and a processing and recordation fee in the aggregate
     amount of $3,000, and

          (vi)  the assignee, if it shall not be a Lender, shall deliver to the
     Administrative Agent an Administrative Questionnaire.

Upon such execution, delivery, acceptance and recording, from and after the
effective date specified in such Assignment and Acceptance, (x) the assignee
thereunder shall be a party hereto and, to the extent that rights and
obligations hereunder have been assigned to it pursuant to such Assignment and
Acceptance, have the rights and obligations of a Lender hereunder and (y) the
Lender assignor thereunder shall, to the extent that rights and obligations
hereunder have been assigned by it pursuant to such Assignment and Acceptance,
relinquish its rights and be released from its obligations under this Agreement
(and, in the case of an Assignment and Acceptance
<PAGE>

                                      -99-

covering all or the remaining portion of an assigning Lender's rights and
obligations under this Agreement, such Lender shall cease to be a party hereto).

          (b)  By executing and delivering an Assignment and Acceptance, the
Lender assignor thereunder and the assignee thereunder confirm to and agree with
each other and the other parties hereto as follows: (i) other than as provided
in such Assignment and Acceptance, such assigning Lender makes no representation
or warranty and assumes no responsibility with respect to any statements,
warranties or representations made in or in connection with this Agreement or
the execution, legality, validity, enforceability, genuineness, sufficiency or
value of this Agreement or any other instrument or document furnished pursuant
hereto; (ii) such assigning Lender makes no representation or warranty and
assumes no responsibility with respect to the financial condition of any Obligor
or the performance or observance by the Obligors of any of their respective
obligations under this Agreement or any other instrument or document furnished
pursuant hereto; (iii) such assignee confirms that it has received a copy of
this Agreement, together with copies of the financial statements referred to in
Section 4.01 and such other documents and information as it has deemed
appropriate to make its own credit analysis and decision to enter into such
Assignment and Acceptance; (iv) such assignee will, independently and without
reliance upon the Administrative Agent, such assigning Lender or any other
Lender and based on such documents and information as it shall deem appropriate
at the time, continue to make its own credit decisions in taking or not taking
action under this Agreement; (v) such assignee confirms that it is an Eligible
Assignee; (vi) such assignee appoints and authorizes the Administrative Agent to
take such action as agent on its behalf and to exercise such powers and
discretion under this Agreement as are delegated to the Administrative Agent by
the terms hereof, together with such powers and discretion as are reasonably
incidental thereto; and (vii) such assignee agrees that it will perform in
accordance with their terms all of the obligations that by the terms of this
Agreement are required to be performed by it as a Lender.

          (c)  The Administrative Agent, acting for this purpose as an agent of
the Borrower, shall maintain at its address referred to in Section 9.02 a copy
of each Assignment and Acceptance delivered to and accepted by it and a register
for the recordation of the names and addresses of the Lenders, and principal
amount of the Advances owing to, each Lender from time to time (the "Register").
                                                                     --------
The entries in the Register shall be conclusive and binding for all purposes,
absent manifest error, and the Borrower, the Administrative Agent and the
Lenders shall treat each Person whose name is recorded in the Register as a
Lender hereunder for all purposes of this Agreement. No assignment shall be
effective until it is recorded in the Register pursuant to this Section 9.07(c).
The Register shall be available for inspection by the Borrower or any Lender at
any reasonable time and from time to time upon reasonable prior notice.

          (d)  Upon its receipt of an Assignment and Acceptance executed by an
assigning Lender and an assignee, together with any Note or Notes subject to
such assignment, and the assignee's completed Administrative Questionnaire
(unless the assignee shall already be a Lender hereunder), the Administrative
Agent shall, if such Assignment and Acceptance has been completed and is in
substantially the form of Exhibit F hereto, (i) accept such Assignment and
<PAGE>

                                     -100-

Acceptance, (ii) record the information contained therein in the Register and
(iii) give prompt notice thereof to the Borrower. Within five Business Days
after its receipt of such notice, the Borrower, at its own expense, shall
execute and deliver to the Administrative Agent in exchange for the surrendered
Note or Notes a new Note or Notes to the order of such assignee in an amount
equal to the principal amount of Advances assigned to it pursuant to such
Assignment and Acceptance and, if the assigning Lender has retained a portion of
such Facilities, a new Note or Notes to the order of the assigning Lender in an
amount equal to the Advances so retained by it hereunder. Such new Note or Notes
shall be dated the effective date of such Assignment and Acceptance and shall
otherwise be in substantially the form of Exhibit A.

          (e)  Each Lender may sell participations in or to all or a portion of
its rights and/or obligations under this Agreement (including, without
limitation, all or a portion of the Advances owing to it and the Note or Notes
held by it); provided that (i) such Lender's obligations under this Agreement
             --------
shall remain unchanged, (ii) such Lender shall remain solely responsible to the
other parties hereto for the performance of such obligations, (iii) such Lender
shall remain the holder of any such Note for all purposes of this Agreement,
(iv) the Obligors, the Administrative Agent and the other Lenders shall continue
to deal solely and directly with such Lender in connection with such Lender's
rights and obligations under this Agreement and (v) no participant under any
such participation shall have any right to approve any amendment or waiver of
any provision of any Basic Document, or any consent to any departure by any
Obligor therefrom, except to the extent that such amendment, waiver or consent
would reduce the principal of, or interest on, the Notes or any fees or other
amounts payable hereunder, in each case to the extent subject to such
participation, postpone any date fixed for any payment of principal of, or
interest on, the Notes or any fees or other amounts payable hereunder, in each
case to the extent subject to such participation, or release all or
substantially all of the Collateral.

          (f)  Any Lender may, in connection with any assignment or
participation or proposed assignment or participation pursuant to this Section
9.07, disclose to the assignee or participant or proposed assignee or
participant, any information relating to the Borrower furnished to such Lender
by or on behalf of the Borrower; provided that, prior to any such disclosure,
                                 --------
the assignee or participant or proposed assignee or participant shall agree in
writing to preserve the confidentiality of any Confidential Information received
by it from such Lender.

          (g)  Notwithstanding any other provision set forth in this Agreement,
any Lender may at any time create a security interest in all or any portion of
its rights under this Agreement (including, without limitation, the Advances
owing to it and the Note or Notes held by it) in favor of any Federal Reserve
Bank in accordance with Regulation A of the Board of Governors of the Federal
Reserve System.

          (h)  Anything in this Section 9.07 to the contrary notwithstanding,
each Lender shall be permitted to pledge all or any part of its right, title and
interest in, to and under the Advances and Notes held by it to any trustee for
the benefit of the holders of such Lender's securities.
<PAGE>

                                     -101-


          (i)  Anything in this Section 9.07 to the contrary notwithstanding,
neither Terra nor any of its Subsidiaries or Affiliates may acquire (whether by
assignment, participation or otherwise), and no Lender shall assign or
participate to Terra or any of its Subsidiaries or Affiliates, any interest in
any Advance or other amount owing hereunder without the prior consent of each
Lender; provided that the Lenders may assign all of their interests in the
        --------
Advances and such other amounts pursuant to the Loan Purchase Agreement.

          Section 9.08.  Execution in Counterparts. This Agreement may be
                         -------------------------
executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed shall be deemed to be an
original and all of which taken together shall constitute one and the same
agreement. Delivery of an executed counterpart of a signature page to this
Agreement by telecopier shall be effective as delivery of a manually executed
counterpart of this Agreement.

          Section 9.09.  Confidentiality. Neither the Administrative Agent nor
                         ---------------
any Lender shall disclose any Confidential Information to any Person without the
prior consent of the Company, other than (a) to the Administrative Agent's or
such Lender's Affiliates and their officers, directors, employees, agents and
advisors (including independent auditors and counsel) and to actual or
prospective assignees and participants, and then only on a confidential basis,
(b) as required by any law, rule or regulation or judicial process, (c) as
requested or required by any state, federal or foreign authority or examiner
regulating or having authority over Lenders or the Lenders' respective
activities and (d) in connection with credit inquiries from suppliers of the
Borrower and/or its Subsidiaries and other Persons who, from time to time,
inquire as to the creditworthiness of the Borrower.

          Section 9.10.  WAIVER OF JURY TRIAL. EACH OF THE OBLIGORS, THE
                         --------------------
ADMINISTRATIVE AGENT AND THE LENDERS HEREBY IRREVOCABLY WAIVES ALL RIGHT TO
TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED ON
CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR RELATING TO ANY OF THE BASIC
DOCUMENTS, THE ADVANCES OR THE ACTIONS OF THE ADMINISTRATIVE AGENT OR ANY LENDER
IN THE NEGOTIATION, ADMINISTRATION, PERFORMANCE OR ENFORCEMENT THEREOF.

          Section 9.11.  Survival. The obligations of the Borrower under
                         --------
Sections 2.08, 2.10 and 9.04, the obligations of each Guarantor under Section
8.03, and the obligations of the Lenders under Section 7.05, shall survive the
repayment of the Advances. In addition, each representation and warranty made,
or deemed to be made by a notice of any extension of credit, herein or pursuant
hereto shall survive the making of such representation and warranty, and no
Lender shall be deemed to have waived, by reason of making any extension of
credit hereunder, any Default or Event of Default that may arise by reason of
such representation or warranty proving to have been false or misleading,
notwithstanding that such Lender or the Administrative Agent may have had notice
or knowledge or reason to believe that such representation or warranty was false
or misleading at the time such extension of credit was made.
<PAGE>

                                     -102-

          Section 9.12.  Captions. The table of contents and captions and
                         --------
section headings appearing herein are included solely for convenience of
reference and are not intended to affect the interpretation of any provision of
this Agreement.

          Section 9.13.  Successors and Assigns. This Agreement shall be
                         ----------------------
binding upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns, provided that no Obligor may assign any of its
                                  --------
rights or obligations hereunder or under the other Basic Documents without the
prior consent of all of the Lenders and the Administrative Agent.

          Section 9.14.  No Immunity. To the extent that the Borrower or the
                         -----------
Subsidiary Guarantor may be or become entitled, in any jurisdiction in which
judicial proceedings may at any time be commenced with respect to this
Agreement, the Notes or any other Loan Document, to claim for itself or its
properties or revenues any immunity from suit, court jurisdiction, attachment
prior to judgment, attachment in aid of execution of a judgment, execution of a
judgment or from any other legal process or remedy relating to its respective
obligations under this Agreement, the Notes or any other Loan Document, and to
the extent that in any such jurisdiction there may be attributed such an
immunity (whether or not claimed), the Borrower and the Subsidiary Guarantor
each hereby irrevocably agrees not to claim and hereby irrevocably waives such
immunity to the fullest extent permitted by the laws of such jurisdiction.

          Section 9.15.  Judgment Currency. This is an international loan
                         -----------------
transaction in which the specification of U.S. Dollars is of the essence, and
U.S. Dollars shall in each instance be the currency of account and payment in
all instances. A payment obligation in U.S. Dollars hereunder shall not be
discharged by an amount paid in another currency (the "Other Currency"), whether
                                                       --------------
pursuant to any judgment expressed in or converted into any Other Currency or in
another place except to the extent that such tender or recovery results in the
effective receipt by the Lender of the full amount of U.S. Dollars payable to
the Administrative Agent and the Lenders under this Agreement. If for the
purpose of obtaining judgment in any court it is necessary to convert a sum due
hereunder in U.S. Dollars into the Other Currency, the rate of exchange that
shall be applied shall be that at which in accordance with normal banking
procedures the Administrative Agent could purchase U.S. Dollars in New York, New
York with the Other Currency on the Business Day next preceding the day on which
such judgment is rendered. The obligation of the Borrower in respect of any such
sum due from it to the Administrative Agent and the Lenders hereunder or under
any other Loan Document shall, notwithstanding the rate of exchange actually
applied in rendering such judgment, be discharged only to the extent that on the
Business Day following receipt by the Administrative Agent or any Lender of any
sum adjudged to be due hereunder in the Other Currency the Administrative Agent
may in accordance with normal banking procedures purchase U.S. Dollars with the
amount of the judgment currency so adjudged to be due; and the Borrower hereby,
as a separate obligation and notwithstanding any such judgment, agrees to
indemnify the Administrative Agent and the Lenders against, and to pay the
Administrative Agent and Lenders on demand, in U.S. Dollars, the amount (if any)
by which the sum originally due to the Administrative Agent
<PAGE>

                                     -103-

and the Lenders in U.S. Dollars hereunder exceeds the amount of the Other
Currency so purchased.
<PAGE>

                                     -104-

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                              THE BORROWER
                              ------------

                              TERRA INTERNATIONAL (CANADA) INC.



                              By /s/ William D. Conner
                                ------------------------------------------
                               Title: Vice President


                              GUARANTORS
                              ----------

                              TERRA INDUSTRIES INC.



                              By /s/ Francis G. Meyer
                                ------------------------------------------
                               Title: S.V.P. and C.F.O.


                              TERRA CAPITAL HOLDINGS, INC.



                              By /s/ William D. Conner
                                ------------------------------------------
                               Title: Vice President


                              TERRA CAPITAL, INC.



                              By /s/ William D. Conner
                                ------------------------------------------
                               Title: Vice President


                              TERRA NITROGEN CORPORATION


                              By /s/ George Valentine
                                ------------------------------------------
                               Title: Vice President
<PAGE>

                                     -105-

                              TERRA INTERNATIONAL, INC.


                              By /s/ William D. Conner
                                ------------------------------------------
                               Title: Vice President


                              TERRA METHANOL CORPORATION


                              By /s/ William D. Conner
                                ------------------------------------------
                               Title: Vice President


                              BMC HOLDINGS, INC.


                              By /s/ William D. Conner
                                ------------------------------------------
                               Title: Vice President


                              BEAUMONT HOLDINGS CORPORATION


                              By /s/ William D. Conner
                                ------------------------------------------
                               Title: Vice President


                              TERRA NITROGEN (U.K.) LIMITED


                              By /s/ Francis G. Meyer
                                ------------------------------------------
                               Title: Director


                              TERRA NITROGEN, LIMITED PARTNERSHIP

                               By: Terra Nitrogen Corporation, its General
                                   Partner


                                   By /s/ George Valentine
                                     ------------------------------------
                                    Title: Vice President
<PAGE>

                                     -106-


                              BEAUMONT METHANOL, LIMITED
                              PARTNERSHIP

                                 By: TERRA METHANOL CORPORATION, as
                                     the General Partner


                                     By /s/William D. Conner
                                       -----------------------------------------
                                      Name: William D. Conner
                                      Title: Vice President


                              BEAUMONT AMMONIA, INC.


                              By /s/ George Valentine
                                ------------------------------------------------
                               Title: Vice President



                              PORT NEAL CORPORATION


                              By /s/ William D. Conner
                                ------------------------------------------------
                               Title: Vice President



                              TERRA INTERNATIONAL (OKLAHOMA) INC.



                              By /s/ William D. Conner
                                ------------------------------------------------
                               Title: Treasurer



                              TERRA (U.K.) HOLDINGS, INC.


                              By /s/ George Valentine
                                ------------------------------------------------
                               Title: Vice President
<PAGE>

                                     -107-

                              THE ADMINISTRATIVE AGENT
                              ------------------------

                              CITIBANK, N.A.



                              By /s/ James N. Simpson
                                -----------------------------------------
                               Title: Attorney-in-Fact


                              THE LENDERS
                              -----------

                              CITIBANK, N.A.



                              By /s/ James N. Simpson
                                -----------------------------------------
                               Title: Attorney-in-Fact


                              BANK OF AMERICA NATIONAL TRUST AND
                                SAVINGS ASSOCIATION



                              By /s/ Tom F. Scharfenberg
                                -----------------------------------------
                               Title: Managing Director


                              NATIONSBANK, N.A.



                              By /s/ Tom F. Scharfenberg
                                -----------------------------------------
                               Title: Managing Director


                              THE BANK OF NOVA SCOTIA



                              By /s/ F.C.H. Ashby
                                -----------------------------------------
                               Title: Senior Manager Loan Operations
<PAGE>

                                     -108-

                              U.S. BANK NATIONAL ASSOCIATION



                              By /s/ David A. Draxler
                                -----------------------------------------
                                Title: Vice President


                              THE CHASE MANHATTAN BANK



                              By /s/ Gary L. Spevack
                                -----------------------------------------
                                Title: Vice President


                              THE FUJI BANK, LIMITED



                              By /s/ Peter L. Chinnici
                                -----------------------------------------
                                Title: Senior Vice President & Group Head


                              CREDIT LYONNAIS CHICAGO BRANCH



                              By /s/ Julie T. Kanak
                                -----------------------------------------
                                Title: Vice President


                              DRESDNER BANK AG, NEW YORK AND
                                GRAND CAYMAN BRANCHES



                              By /s/ Deborah Slusarczyk
                                -----------------------------------------
                                Title: Vice President



                              By /s/ Ken Hamilton
                                -----------------------------------------
                                Title: Senior Vice President
<PAGE>

                                     -109-



                              HARRIS TRUST & SAVINGS BANK



                              By /s/ Robert A. Wolohan
                                ------------------------------------------
                               Title: Vice President


                              SUNTRUST BANK, ATLANTA



                              By /s/ Michel A. Odermatt
                                ------------------------------------------
                               Title: Vice President


                              CREDIT AGRICOLE INDOSUEZ



                              By /s/ Katherine L. Abbott
                                ------------------------------------------
                               Title: First Vice President
                                      Managing Director


                              By /s/ Bradley C. Peterson
                                ------------------------------------------
                               Title: Vice President, Manager


                              BANQUE NATIONALE DE PARIS



                              By /s/ Arnaud Collin du Bocage
                                ------------------------------------------
                               Title: Executive Vice President
                                      And General Manager



                              By Not Required
                                ------------------------------------------
                               Title:
<PAGE>

                                     -110-

                              THE BANK OF NEW YORK



                              By /s/ John-Paul Marotta
                                ------------------------------------------
                               Title: Vice President


                              NORWEST BANK IOWA, NATIONAL
                                ASSOCIATION



                              By /s/ John Wagner
                                ------------------------------------------
                               Title: Vice President


                              COOPERATIEVE CENTRALE RAIFFEISEN-
                                BOERENLEENBANK, B.A.,
                                "RABOBANK NEDERLAND", NEW YORK
                                BRANCH


                              By /s/ Hans F. Breukhoven
                                ------------------------------------------
                               Title: Vice President


                              By /s/ Ian Reece
                                ------------------------------------------
                               Title: Senior Credit Officer
<PAGE>

                                     -111-

                              THE SUMITOMO BANK, LIMITED



                              By /s/ John Kemper
                                ------------------------------------
                               Title: Senior Vice President


                              THE FIRST NATIONAL BANK OF CHICAGO



                              By /s/ Nathan L. Bloch
                                ------------------------------------
                               Title: First Vice President
<PAGE>

                                     -112-

                              THE SYNDICATION AGENTS
                              ----------------------

                              BANK OF AMERICA NATIONAL TRUST AND
                                SAVINGS ASSOCIATION



                              By /s/ Tom F. Scharfenberg
                                --------------------------------------------
                               Title: Managing Director


                              THE BANK OF NOVA SCOTIA



                              By /s/ M.D. Smith
                                --------------------------------------------
                               Title: Agent Operations


                              By Not Required
                                --------------------------------------------
                               Title:

<PAGE>

                                                                         ANNEX A
                               Applicable Margin
                               -----------------

          "Applicable Margin" means, (a) with respect to all Base Rate Advances,
           -----------------
3.50% per annum and (b) with respect to all Eurodollar Rate Advances, 5.00% per
annum; provided that:
       --------

          (1)  The Applicable Margin shall, from the Restatement Date until the
     Quarterly Date falling in September, 1999, be (a) with respect to all Base
     Rate Advances, 2.50% per annum and (b) with respect to all Eurodollar Rate
     Advances, 4.00% per annum.

          (2)  Subject to clause (1) above, if for any Rolling Period ending on
     or after the June 30, 1999 the Debt to Cash Flow Ratio for such Rolling
     Period shall be within any of the ranges specified in the schedule below,
     then, subject to the delivery to the Administrative Agent of a certificate
     of the Senior Financial Officer demonstrating the same prior to the first
     Quarterly Date (the "relevant Quarterly Date") occurring after the end of
                          -----------------------
     such Rolling Period, the "Applicable Margin" shall be changed to the
     percentage per annum for the respective Type of Advance set forth opposite
     the reference to such range in such schedule during the period commencing
     on the relevant Quarterly Date until the next succeeding Quarterly Date
     thereafter:

                                       Applicable Margin (% p.a.)
                                       --------------------------

           Range of Debt              Base Rate    Eurodollar Rate
          to Cash Flow Ratio          Advances       Advances
          ------------------          --------       --------

          Greater than 8.00 to 1        3.50%           5.00%

          Less than or equal to
           8.00 to 1 and greater
           than 7.50 to 1               3.00%           4.50%

          Less than or equal to
           7.50 to 1 and greater
           than 7.00 to 1               2.50%           4.00%

          Less than or equal to
           7.00 to 1 and greater
           than 6.50 to 1               2.25%           3.75%

          Less than or equal to
           6.50 to 1 and greater
           than 6.00 to 1               2.00%           3.50%

<PAGE>

                                      -2-

          Less than or equal to
           6.00 to 1                    1.75%           3.25%


<PAGE>

                                                                   SCHEDULE 2.01

                             Outstanding Advances
                             --------------------
<TABLE>
<CAPTION>

Lender                                     Outstanding Advances
- ------                                     --------------------
<S>                                        <C>
Citibank, N.A.                                   $13,140,274.70
Banque Nationale de Paris                        $10,608,552.19
Bank of America National Trust and               $ 9,862,500.00
  Savings Association
The Bank of Nova Scotia                          $ 9,862,500.00
U.S. Bank National Association                   $ 8,625,000.00
The Chase Manhattan Bank                         $ 8,491,847.81
NationsBank, N.A.                                $ 8,491,847.81
The Fuji Bank, Limited                           $ 6,167,762.81
Credit Lyonnais Chicago Branch                   $ 5,944,293.75
Dresdner Bank AG, New York and                   $ 5,944,293.75
  Grand Cayman Branches
Harris Trust & Savings Bank                      $ 5,944,293.75
Suntrust Bank, Atlanta                           $ 5,944,293.75
The Bank of New York                             $ 4,245,924.37
Cooperatieve Centrale Raiffeisen-                $ 3,396,738.75
  Boerenleenbank, B.A., "Rabobank
  Nederland", New York Branch
Norwest Bank Iowa, National Association          $ 3,396,738.75
The Sumitomo Bank, Limited                       $ 3,396,738.75
First National Bank of Chicago                   $ 2,467,105.31
Credit Agricole Indosuez                         $ 1,256,793.75
</TABLE>


<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from
Terra Industries Inc., and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                         DEC-31-1999
<PERIOD-START>                            JAN-01-1999
<PERIOD-END>                              JUN-30-1999
<CASH>                                         30,845
<SECURITIES>                                    5,422
<RECEIVABLES>                                 197,980
<ALLOWANCES>                                 (15,414)
<INVENTORY>                                   131,321
<CURRENT-ASSETS>                              417,854
<PP&E>                                      1,290,040
<DEPRECIATION>                              (283,477)
<TOTAL-ASSETS>                              1,749,877
<CURRENT-LIABILITIES>                         219,489
<BONDS>                                       477,608
                               0
                                         0
<COMMON>                                      127,890
<OTHER-SE>                                    550,743
<TOTAL-LIABILITY-AND-EQUITY>                1,749,877
<SALES>                                       403,400
<TOTAL-REVENUES>                              411,924
<CGS>                                         413,648
<TOTAL-COSTS>                                 413,648
<OTHER-EXPENSES>                                    0
<LOSS-PROVISION>                                  280
<INTEREST-EXPENSE>                             25,575
<INCOME-PRETAX>                              (54,337)
<INCOME-TAX>                                 (21,800)
<INCOME-CONTINUING>                          (32,537)
<DISCONTINUED>                               (10,523)
<EXTRAORDINARY>                               (7,295)
<CHANGES>                                           0
<NET-INCOME>                                 (50,355)
<EPS-BASIC>                                    (0.68)
<EPS-DILUTED>                                  (0.68)



</TABLE>


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