TERRA INDUSTRIES INC
SC 13D/A, 1997-04-07
MISCELLANEOUS NONDURABLE GOODS
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<PAGE>
 

                                                              Page 1 of 43 Pages


                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 Schedule 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 2)*


                         TERRA NITROGEN COMPANY, L.P.
                         ----------------------------
                               (Name of Issuer)

           Senior Preference Units of Limited Partnership Interests
           --------------------------------------------------------
                        (Title of Class of Securities)

                                  881005 102
                              ------------------
                                (CUSIP Number)



                                                   N. Jordan
                                                   Secretary
                George H. Valentine                 Minorco
                Corporate Secretary        Taurus International S.A.
               Terra Industries Inc.        Taurus Investments S.A.
                   Terra Centre               9 Rue Sainte Zithe
                 600 Fourth Street             Luxembourg City,
            Sioux City, Iowa 51102-6000           Luxembourg
                  (712) 277-1340                (352) 404-1101
            --------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                                March 31, 1997
                     ------------------------------------
                     (Date of Event which Requires Filing
                              of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement [_]. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

*The remainder of this cover page shall be filed out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                       (Continued on following page(s))
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 881005 102                                     PAGE 2 OF 43 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      Terra Nitrogen Corporation
      EIN:  72-1159610                   
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          -0-
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             -0- (See Item 5)
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          -0- 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          -0- (See Item 5)  
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      -0- (See Item 5)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      0.0% (See Item 5)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 881005 102                                     PAGE 3 OF 43 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      Terra Captial, Inc. 
      EIN:  42-1431650                   
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
 5    TO ITEMS 2(d) or 2(e)                                         [_]
     
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          -0-
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             -0- (See Item 5)
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          -0-
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          -0- (See Item 5)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      -0- (See Item 5)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      0.0% (See Item 5)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------

<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 881005 102                                     PAGE 4 OF 43 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      Terra Capital Holdings, Inc.
      EIN: 42-1431905                    
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          -0-
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             -0- (See Item 5)
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          -0-
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          -0- (See Item 5)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      -0- (See Item 5)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      0.0% (See Item 5)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 881005 102                                     PAGE 5 OF 43 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      Terra Industries Inc.
      EIN: 52-1145429                    
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      OO      
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
 5    TO ITEMS 2(d) or 2(e)                                         [_]
     
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      Maryland
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          -0-
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             -0- (See Item 5)
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          -0-
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          -0- (See Item 5)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      -0- (See Item 5)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      0.0% (See Item 5)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 881005 102                                     PAGE 6 OF 43 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Taurus Investments S.A.
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
 5    TO ITEMS 2(d) or 2(e)                                         [_]
     
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      Luxembourg
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          -0-
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             -0- (See Item 5)
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          -0-
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          -0- (See Item 5)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      -0- (See Item 5)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      0.0% (See Item 5)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------

<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 881005 102                                     PAGE 7 OF 43 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Taurus International S.A.
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
 5    TO ITEMS 2(d) or 2(e)                                         [_]
     
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      Luxembourg
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          -0-
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             -0- (See Item 5)
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          -0-
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          -0- (See Item 5)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      -0- (See Item 5)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      0.0% (See Item 5)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------

<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 881005 102                                     PAGE 8 OF 43 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Minorco
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
     
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
 5    TO ITEMS 2(d) or 2(e)                                         [_]
     
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      Luxembourg
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            
                          -0-
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             -0- (See Item 5)
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             
                          -0-
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                          -0- (See Item 5)
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      
      -0- (See Item 5)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      0.0% (See Item 5)
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------

<PAGE>
 
                                                              Page 9 of 43 Pages


Item 1.  Security and Issuer.

     This statement relates to Senior Preference Units of limited partnership
interests (the "Senior Units") of Terra Nitrogen Company, L.P., a Delaware
limited partnership ("TNCLP"), which has its principal executive offices at 5100
East Skelly Drive, Suite 800, Tulsa, Oklahoma  74135.

Item 2.  Identity and Background.

     (a) This Statement is being jointly filed by each of the following persons
pursuant to Rule 13d-(1)(f) promulgated by the Securities and Exchange
Commission pursuant to Section 13 of the Securities Exchange Act of 1934, as
amended (the "Act"): (i) Terra Nitrogen Corporation, a Delaware corporation
("TNC"), by virtue of its direct beneficial ownership of Senior Units; (ii)
Terra Capital, Inc., a Delaware corporation ("Terra Capital"), by virtue of its
direct beneficial ownership of Senior Units and by virtue of its ownership of
all the outstanding common stock of TNC; (iii) Terra Capital Holdings, Inc., a
Delaware corporation ("Terra Holdings"), by virtue of its ownership of all the
outstanding common stock of Terra Capital; (iv) Terra Industries Inc., a
Maryland corporation ("Terra"), by virtue of its ownership of all the
outstanding common stock of Terra Holdings; (v) Taurus Investments S.A., a
company incorporated under the laws of Luxembourg ("Taurus Investments"), by
virtue of its ownership of 7.2% of the outstanding common stock of Terra; (vi)
Taurus International S.A., a company incorporated under the laws of Luxembourg
("Taurus International"), by virtue of its direct ownership of 49.8% of the
outstanding common stock of Terra; and (vii) Minorco, a company incorporated
under the laws of Luxembourg ("Minorco"), by virtue of its direct or indirect
ownership of all the outstanding common stock of each of Taurus International
and Taurus Investments (TNC, Terra Capital, Terra Holdings, Terra, Taurus
International, Taurus Investments and Minorco are collectively referred to
herein as the "Reporting Persons"). Certain information required by this Item 2
concerning the directors and executive officers of the Reporting Persons, each
person in control of each Reporting Person and the directors and executive
officers of the person ultimately in control of the Reporting Persons is set
forth on Annex A attached hereto, which is incorporated herein by reference. 

     The Reporting Persons may be deemed to constitute a "group" for purposes of
Section 13(d)(3) of the Act. The Reporting Persons expressly disclaim that they
have agreed to act as a group other than as described in this Statement.

     (b) The address of the principal business and principal office of TNC is
5100 East Skelly Drive, Suite 800, Tulsa, Oklahoma  74135.  The address of the
principal business and principal office of each of Terra Capital, Terra Holdings
and Terra is Terra Centre, 600 Fourth Street, P.O. Box 6000, Sioux City, Iowa
51102-6000.  The address of the principal business and principal office of each
of Taurus International, Taurus Investments and Minorco is 9 rue Sainte Zithe,
L-2763 Luxembourg City, Grand Duchy of Luxembourg.
 
     (c) TNC is the General Partner of TNCLP.  Terra Capital is primarily a
holding company which holds the stock of significant operating subsidiaries of
Terra.  Terra Holdings is a holding company which holds the stock of Terra
Capital.  Terra is a holding company which holds the stock of Terra Holdings and
certain other subsidiaries.  Taurus International and Taurus Investments are
holding companies which hold the stock of certain subsidiaries of Minorco.
Minorco is an international natural resources company with operations in gold,
base metals, industrial minerals, paper and packaging and agribusiness.
 
     (d) During the last five years, none of the Reporting Persons nor, to the
best knowledge of the Reporting Persons, any of the persons named in Annex A to
this Statement, has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors).

     (e) During the last five years, none of the Reporting Persons nor, to the
best knowledge of the Reporting Persons, any of the persons named in Annex A to
this Statement, was a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction as a result of which any such
person
<PAGE>
 
                                                             Page 10 of 43 Pages

was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, federal or
state securities laws or finding any violation with respect to such laws.

     (f) Except as otherwise indicated on Annex A, all persons named in Annex A
to this Statement are citizens of the United States.

Item 3.  Source and Amount of Funds or Other Consideration.

     Pursuant to TNCLP's Agreement of Limited Partnership, on December 31, 1996,
TNC, as general partner of TNCLP (TNC is sometimes hereinafter referred to as
the "General Partner"), mailed notice to the holders of the Senior Units that on
December 31, 1996 the Senior Conversion Date (as defined in the Agreement of
Limited Partnership) had occurred and that such holders had the right to elect
to convert their Senior Units into common units of TNCLP limited partnership
interests (the "Common Units").  Prior to the March 31, 1997 conversion
expiration date, TNC and Terra Capital elected to convert all Senior Units held
by such entities into Common Units.  Pursuant to TNCLP's Agreement of Limited
Partnership, such conversion occurred on March 31, 1997.

Item 4.  Purpose of Transaction.

     TNC and Terra Capital elected to convert the Senior Units into Common Units
pursuant to the Agreement of Limited Partnership (see Item 3).  Depending on
market conditions and other factors, including availability of funds,
alternative uses of funds and general economic conditions, Terra and its
subsidiaries may from time to time purchase additional securities of TNCLP
pursuant to open market purchases, merger, tender offer or otherwise or dispose
of all or a portion of its investment in TNCLP.

     Pursuant to the terms of TNCLP's Agreement of Limited Partnership, TNC, as
the General Partner, has notified the holders of the Senior Units of record on
April 1, 1997 that TNCLP has elected to redeem all outstanding Senior Units on
May 27, 1997 on which date the Senior Units will be deemed to be no longer
outstanding.

     Under the terms of TNCLP's Agreement of Limited Partnership, TNC, as the
General Partner, has exclusive authority to manage the business and operations
of TNCLP.  As sole stockholder of TNC, Terra has the power to elect the TNC
board of directors and therefore may be deemed to effectively control the
management of TNC.  Although Terra may change the directors and management of
TNC in the future, it does not have any present intention or plan of doing so.

     Except as described in Item 3 or this Item 4, none of the Reporting
Persons, nor, to the best knowledge of the Reporting Persons, any of the persons
named in Annex A to this Statement, has formulated any plans or proposals which
relate to or would result in:  (a) the acquisition by any person of additional
securities of TNCLP, or the disposition of securities of TNCLP; (b) an
extraordinary corporate transaction, such as a merger, reorganization or
liquidation, involving TNCLP or any of its subsidiaries; (c) a sale or transfer
of a material amount of assets of TNCLP or any of its subsidiaries; (d)  any
change in the present Board of Directors or management of the General Partner,
including any plans or proposals to change the number or term of directors or to
fill any existing vacancies on the Board; (e) any material change in the present
capitalization or distribution policy of TNCLP; (f) any other material change in
TNCLP's business or corporate structure; (g) any changes in TNCLP's Certificate
of Limited Partnership or Agreement of Limited Partnership or other actions
which may impede the acquisition of control of TNCLP by any person; (h) causing
a class of securities of TNCLP to be delisted from a national securities
exchange or to cease to be authorized to be quoted in an interdealer quotation
system of a registered national securities association; (i) causing a class of
equity securities of TNCLP to become eligible for termination of registration
pursuant to Section 12(g)(4) of the Act; or (j) any action similar to those
enumerated above.
<PAGE>
 
                                                             Page 11 of 43 Pages

Item 5.  Interest in Securities of the Issuer.

     (a)  None of TNC, Terra Capital, Terra Holdings, Terra, Taurus
International, Taurus Investments or Minorco possess direct or may be deemed to
possess indirect beneficial ownership of Senior Units.

     Neither the Reporting Persons nor, to the best knowledge of the Reporting
Persons, any of the persons named in Annex A to this Statement owns
beneficially, or has any right to acquire, directly or indirectly, any Senior
Units.

     (b)  None of TNC, Terra Capital, Terra Holdings, Terra, Taurus
International, Taurus Investments or Minorco has or may be deemed to have the
power to vote or direct the vote and the power to dispose of or direct the
disposition of Senior Units.
 
     (c)  Except as indicated below or in Item 3 above, neither the Reporting
Persons nor, to the best knowledge of the Reporting Persons, any of the persons
named in Annex A to this Statement, has effected a transaction in Senior Units
during the past 60 days.  Pursuant to TNCLP's Agreement of Limited Partnership,
Steven A. Savage, Erik L. Slockers and Charles J. Pero, officers of TNC,
converted 4,000, 1,800 and 750 Senior Units, respectively, into Common Units on
March 31, 1997.

     (d)  Not applicable.

     (e)  The Reporting Persons ceased to be the beneficial owner of more than
five percent of the outstanding Senior Units on March 31, 1997. (See Item 3).

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

     Except as otherwise set forth in this Statement, to the best knowledge of
the Reporting Persons, no contracts, arrangements, understandings or
relationships (legal or otherwise) exist among the persons named in Item 2 or
between such persons and any other person with respect to any securities of
TNCLP, including but not limited to transfer or voting of any of the securities,
finder's fees, joint ventures, loan or option arrangements, puts or calls,
guarantees of profits, division of profits or loss, or the giving or withholding
of proxies.

Item 7.  Material to be Filed as Exhibits.

     Exhibit A -- Agreement Re Joint Filing of Schedule 13D
<PAGE>
 
                                                             Page 12 of 43 Pages

                                   SIGNATURE

          After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 7, 1997


                                       TERRA NITROGEN CORPORATION

                                       By   /s/ George H. Valentine

                                       Its    Vice President and General Counsel
<PAGE>
 
                                                             Page 13 of 43 Pages


                                   SIGNATURE

          After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 7, 1997


                                     TERRA CAPITAL, INC.

                                     By   /s/ George H. Valentine

                                     Its Vice President and Corporate Secretary
<PAGE>
 
                                                             Page 14 of 43 Pages

                                   SIGNATURE

          After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 7, 1997


                                      TERRA CAPITAL HOLDINGS, INC.

                                      By   /s/ George H. Valentine

                                      Its Vice President and Corporate Secretary
<PAGE>
 
                                                             Page 15 of 43 Pages


                                   SIGNATURE

          After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 7, 1997


                                     TERRA INDUSTRIES INC.

                                     By   /s/ George H. Valentine

                                     Its Senior Vice President, General Counsel
                                         and Corporate Secretary
<PAGE>
 
                                                             Page 16 of 43 Pages

                                   SIGNATURE

          After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 7, 1997


                                         TAURUS INVESTMENTS S.A.

                                         By  /s/ Nick Jordan

                                         Its Secretary
<PAGE>
 
                                                             Page 17 of 43 Pages

                                   SIGNATURE

          After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 7, 1997


                                         TAURUS INTERNATIONAL S.A.

                                         By  /s/ Nick Jordan

                                         Its   Secretary
<PAGE>
 
                                                             Page 18 of 43 Pages

                                   SIGNATURE

          After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 7, 1997


                                         MINORCO

                                         By  /s/ Nick Jordan

                                         Its   Secretary
<PAGE>

                                                             Page 19 of 43 Pages

ANNEX A

I.   The following table sets forth certain information concerning each of the
Directors and Officers of TNC.
<TABLE>
<CAPTION>

<S>                      <C> 
Name:                    Lawrence S. Hlobik (Director, President)
Citizenship:             United States of America
Business Address:        5100 E. Skelly Drive, Suite 800
                         Tulsa, Oklahoma  74135-6565
Principal Occupation:    Director, Chairman of the Board of Directors, President
                         TNC

Name:                    Francis G. Meyer (Director, Vice President)
Citizenship:             United States of America
Business Address:        Terra Centre, 600 Fourth Street, P.O. Box 6000
                         Sioux City, Iowa  51102-6000
Principal Occupation:    Senior Vice President and Chief Financial Officer, Terra

Name:                    George H. Valentine (Vice President and
                         General Counsel)
Citizenship:             United States of America
Business Address:        Terra Centre, 600 Fourth Street, P.O. Box 6000
                         Sioux City, Iowa  51102-6000
Principal Occupation:    Senior Vice President, General Counsel and Corporate
                         Secretary, Terra

Name:                    Robert E. Thompson (Vice President)
Citizenship:             United States of America
Business Address:        Terra Centre, 600 Fourth Street, P.O. Box 6000
                         Sioux City, Iowa  51102-6000
Principal Occupation:    Vice President, Controller, Terra

Name:                    W. Mark Rosenbury (Director)
Citizenship:             United States of America
Business Address:        Terra Centre, 600 Fourth Street, P.O. Box 6000
                         Sioux City, Iowa  51102-6000
Principal Occupation:    Vice President, Business Development and Strategic
                         Planning, Terra

Name:                    Michael L. Bennett (Director)
Citizenship:             United States of America
Business Address:        Terra Centre, 600 Fourth Street, P.O. Box 6000
                         Sioux City, Iowa  51102-6000
Principal Occupation:    Executive Vice President and Chief Operating Officer,
                         Terra

</TABLE>

<PAGE>
 
                                                             Page 20 of 43 Pages

Name:                    Thomas Buck (Director)
Citizenship:             United States of America
Business Address:        55500 Country Club
                         South Bend, Indiana  46619
Principal Occupation:    Partner (retired) Price Waterhouse LLP

Name:                    Robert W. Todd (Director)
Citizenship:             United States of America
Business Address:        1013 A Buckingham Drive
                         Lakehurst, New Jersey  08733
Principal Occupation:    Vice President, Chemical Industry Services (retired)
                         Citibank N.A.

Name:                    Steven A. Savage (Senior Vice President, Manufacturing)
Citizenship:             United States of America
Business Address:        5100 E. Skelly Drive, Suite 800
                         Tulsa, Oklahoma  74135-6565
Principal Occupation:    Senior Vice President, Manufacturing, TNC

Name:                    Bryan D. Evans (Vice President, Marketing)
Citizenship:             United States of America
Business Address:        5100 E. Skelly Drive, Suite 800
                         Tulsa, Oklahoma  74135-6565
Principal Occupation:    Vice President, Marketing, TNC
 
Name:                    Erik L. Slockers (Vice President, Controller & 
                         Assistant Secretary)
Citizenship:             United States of America
Business Address:        5100 E. Skelly Drive, Suite 800
                         Tulsa, Oklahoma  74135-6565
Principal Occupation:    Vice President, Controller & Assistant Secretary,
                         TNC
 
Name:                    Charles J. Pero (Vice President, Human Resources)
Citizenship:             United States of America
Business Address:        5100 E. Skelly Drive, Suite 800
                         Tulsa, Oklahoma  74135-6565
Principal Occupation:    Vice President, Human Resources, TNC

Name:                    Scott C. Shelton (Vice President, Energy)
Citizenship:             United States of America
Business Address:        5100 E. Skelly Drive, Suite 800
                         Tulsa, Oklahoma  74135-6565
Principal Occupation:    Vice President, Energy, TNC

<PAGE>

                                                             Page 21 of 43 Pages

II.  The following table sets forth certain information concerning each of the
Directors and Officers of Terra Capital.

     The following list sets forth the names of certain Directors and Officers
of Terra Capital and the sections of this Annex A in which other information
concerning them is set out, to which sections reference is hereby made:


Francis G. Meyer       (Director, Vice President        SECTION I
                       and Treasurer)
George H. Valentine    (Director, Vice President        SECTION I
                       and Corporate Secretary)
Robert E. Thompson     (Vice President)                 SECTION I

Name:                  Burton M. Joyce (Director, President)
Citizenship:           United States of America
Business Address:      Terra Centre, 600 Fourth Street, P.O. Box 6000
                       Sioux City, Iowa  51102-6000

Principal Occupation:  Director, President, Chief Executive Officer, Terra
<PAGE>
 
                                                             Page 22 of 43 Pages

III.      The following table sets forth certain information concerning each of
the Directors and Officers of Terra Holdings.

          The following list sets forth the names of certain Directors and
Officers of Terra Holdings and the sections of this Annex A in which other
information concerning them is set out, to which sections reference is hereby 
made:

 
Burton M. Joyce        (Director, President)       SECTION II
Francis G. Meyer       (Director, Vice President   SECTION I
                        and Treasurer)
George H. Valentine    (Director, Vice President   SECTION I
                        and Corporate Secretary)

<PAGE>
 
                                                             Page 23 of 43 Pages

IV.  The following table sets forth certain information concerning each of the
Directors and Officers of Terra.

     The following list sets forth the names of certain Directors and Officers
of Terra and the sections of this Annex A in which other information concerning
them is set out, to which sections reference is hereby made:

Michael L. Bennett       (Executive Vice President and          SECTION I
                         Chief Operating Officer)
Lawrence S. Hlobik       (Senior Vice President)                SECTION I
Burton M. Joyce          (Director, President and               SECTION II
                         Chief Executive Officer)
Francis G. Meyer         (Senior Vice President and             SECTION I
                         Chief Financial Officer)
W. Mark Rosenbury        (Vice President, Business              SECTION I
                         Development and Strategic Planning)
Robert E. Thompson       (Vice President, Controller)           SECTION I
George H. Valentine      (Senior Vice President, General        SECTION I
                         Counsel and Corporate Secretary)

Name:                    William R. Loomis, Jr. (Chairman and Director)
Citizenship:             United States of America
Business Address:        Four Embarcadero Center
                         Suite 650
                         San Francisco, CA 94111
Principal Occupation:    Managing Director, Lazard Freres & Co. LLC

Name:                    Edward G. Beimfohr (Director)
Citizenship:             United States of America
Business Address:        320 Park Avenue
                         New York, New York  10022-6815
Principal Occupation:    Partner, Lane & Mittendorf (Law Firm)
                         Director, Minorco

Name:                    Carol L. Brookins (Director)
Citizenship:             United States of America
Business Address:        1150 18th Street, N.W., Suite 275
                         Washington, D.C.  20036
Principal Occupation:    Founder, Chairman and Chief Executive Officer,
                         World Perspectives, Incorporated
<PAGE>
 
                                                             Page 24 of 43 Pages

Name:                    Edward M. Carson (Director)
Citizenship:             United States of America
Business Address:        707 Wilshire Boulevard, 7th Floor, MAC 2818-078
                         Los Angeles, CA  90071
Principal Occupation:    Retired Chairman and Chief Executive Officer, First
                         Interstate Bancorp

Name:                    David E. Fisher (Director)
Citizenship:             British
Business Address:        9 rue Sainte Zithe
                         L-2763 Luxembourg City, Luxembourg
Principal Occupation:    Finance Director, Minorco

Name:                    Basil T.A. Hone (Director)
Citizenship:             British
Business Address:        18 King Street
                         Oldwick, New Jersey  08858
Principal Occupation:    Retired Vice President, Metal Division of Union Carbide
                         Corporation

Name:                    Anthony W. Lea (Director)
Citizenship:             South African
Business Address:        40 Holborn Viaduct
                         London, England EC1N 2PQ
Principal Occupation:    Executive Director, Minorco

Name:                    Henry R. Slack (Director)
Citizenship:             United States of America
Business Address:        40 Holborn Viaduct
                         London, England EC1N 2PQ
Principal Occupation:    President and Chief Executive, Minorco

Name:                    John R. Norton III (Director)
Citizenship:             United States of America
Business Address:        3200 East Camelback Road, Suite 389
                         Phoenix, Arizona  85018-2328
Principal Occupation:    Chairman and Chief Executive Officer, J. R. Norton
                         Company
<PAGE>

                                                             Page 25 of 43 Pages


Name:                    John S. Burchfield (Vice President, Human Resources)
Citizenship:             United States of America
Business Address:        Terra Centre, 600 Fourth Street, P.O. Box 6000
                         Sioux City, Iowa  51102-6000
Principal Occupation:    Vice President, Human Resources, Terra


Name:                    Paula C. Norton (Vice President, Corporate and Investor
                         Relations)
Citizenship:             United States of America
Business Address:        Terra Centre, 600 Fourth Street, P.O. Box 6000
                         Sioux City, Iowa  51102-6000
Principal Occupation:    Vice President, Corporate and Investor Relations



<PAGE>

                                                             Page 26 of 43 Pages


V.  Information with Respect to Persons in Control of Reporting Persons

         The capital stock of Minorco is owned in part as follows: approximately
45.8%, directly or through subsidiaries, by Anglo American Corporation of South
Africa Limited ("AAC" or "Anglo American") which is a publicly held mining and
finance company and approximately 22.6%, directly or through subsidiaries, by De
Beers Centenary AG ("Centenary"), a publicly held Swiss diamond mining and
investment company. Approximately 38.5% of the capital stock of Anglo American
is owned, directly or through subsidiaries, by De Beers Consolidated Mines
Limited ("De Beers"), a publicly held diamond mining and investment company.
Approximately 29.4% of the capital stock of Centenary and approximately 32.5% of
the capital stock of De Beers is owned, directly or through subsidiaries, by
Anglo American. De Beers owns approximately 9.5% of Centenary. The address of
the principal business and principal office of AAC is 44 Main Street,
Johannesburg, South Africa. The address of the principal business and principal
office of Centenary is Langensandstrasse, CH 6000, Lucerne, Switzerland. The
address of the principal business and principal office of De Beers is 36
Stockdale Street, Kimberley 8301, South Africa.

        Mr. Nicholas F. Oppenheimer, Deputy Chairman and a director of Anglo
American, Centenary and De Beers and a director of Minorco, and Mr. Henry R.
Slack, a director of Terra, Chief Executive, President and a director of Minorco
and a director of Anglo American, have indirect partial interests in
approximately 7% of the outstanding shares of Minorco and approximately 8% of
the outstanding shares of Anglo American. Also, Mr. Basil T.A. Hone beneficially
owns 3,000 Minorco Ordinary Shares and 1,000 Anglo American Ordinary Shares,
each constituting less than one percent of the outstanding shares of the
respective issuers.



<PAGE>
 

                                                             Page 27 of 43 Pages


VI.  The following table sets forth certain information concerning each of the
Directors and other Officers of Minorco.

The following list sets forth the names of certain Directors and Executive
Officers of Minorco and the sections of this Annex "A" in which other
information concerning them is set out, to which sections reference is hereby
made:
 
E. G. BEIMFOHR          (Director)                         SECTION IV
D. E. FISHER            (Finance Director)                 SECTION IV
A. W. LEA               (Executive Director)               SECTION IV
W. R. LOOMIS            (Executive Director)               SECTION IV
H. R SLACK              (Director, President and
                        Chief Executive Officer)           SECTION IV
 
Name:                   J. Ogilvie Thompson (Director and Chairman)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Chairman, Minorco, De Beers, Centenary,
                        Executive Director and Chairman, AAC, Director,
                        Anglo American Gold Investment Company Limited
                        ("Amgold") (gold investment company)

Name:                   J. R. de Aragao Bozano (Director)
Citizenship:            Brazilian
Business Address:       Banco Bozano Simonsen S. A., 138
                        Avenida Rio Branco, Rio de Janeiro, Brazil
Principal Occupation:   Chairman of the Board, Banco Bozano Simonsen de
                        Investimento S. A. (Merchant bank) and Chairman of the
                        Board,Cia. Bozano Simonsen Comercio e Industria S. A.
                        (Commercial Bank)
 
Name:                   P. C. D. Burnell (Director)
Citizenship:            British
Business Address:       40 Holborn Viaduct
                        London, England EC1N 2PQ
Principal Occupation:   Executive Director, Minorco
 
Name:                   C. A. Crocker (Director)
Citizenship:            United States of America
Business Address:       Georgetown University
                        School of Foreign Service
                        Intercultural Centre
                        Room 813
                        Washington D.C. 20057
Principal Occupation:   Research Professor of Diplomacy

Name:                   Viscount Etienne Davignon (Director)
Citizenship:            Belgian
Business Address:       30 Rue Royale, B-1000
                        Brussels, Belgium
Principal Occupation:   Chairman, Societe Generale de Belgique (Bank)
<PAGE>
                                                                                

                                                             Page 28 of 43 Pages


Name:                   E. P. Gush (Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001
                        Republic of South Africa
Principal Occupation:   Executive Director and Deputy Chairman, AAC, Director,
                        De Beers and Centenary
 
Name:                   M. W. King (Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001
                        Republic of South Africa
Principal Occupation:   Executive Director and Finance Division Head, AAC
                        
Name:                   J. E. Oppenheimer (Director)
Citizenship:            German & Brazilian
Business Address:       Av Pedro de Valdivia 295
                        Santiago, Chile
Principal Occupation:   President, Minorco Argentina and Director of
                        Empresa Minera de Mantos Blancos S.A. (Producer of
                        copper & silver)
 
Name:                   N. F. Oppenheimer (Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001
                        Republic of South Africa
Principal Occupation:   Director and Deputy Chairman, De Beers, Centenary,
                        Deputy Chairman and Executive Director, AAC, Chairman,
                        Amgold

Name:                   G. W. H. Rellv (Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Executive Director, AAC; Director, De Beers & Centenary

Name:                   R. F. Richards (Director)
Citizenship:            United States of America
Business Address:       250 Park Avenue
                        New York, NY 10177
                        U.S.A.
Principal Occupation:   Retired, Chairman, Minorco (U.S.A.) Inc.

Name:                   C. E. Ritchie (Director)
Citizenship:            Canadian
Business Address:       44 King Street West
                        Toronto, Ontario M5H 1E2
Principal Occupation:   Corporate Director, Bank of Nova Scotia (Commercial 
                        bank)
<PAGE>
 

                                                             Page 29 of 43 Pages


Name:                   H-J. Schreiber (Director)
Citizenship:            German
Business Address:       Bestor Investers Ltd.
                        10, Collyer Quay
                        11-01, Ocean Bldg.
                        Singapore 0104
Principal Occupation:   Chairman, Bestor Investers Pte. Ltd. (Consulting firm)
 
Name:                   O. R. Smith (Director)
Citizenship:            United States of America
Business Address:       101 Wood Avenue
                        Iselin, New Jersey 08830-0770, U.S.A.
Principal Occupation:   Chairman and Chief Executive Officer of Engelhard
                        Corporation

Name:                   T C. A. Wadeson (Director)
Citizenship:            British
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Group Technical Director, AAC
 
Name:                   P. S. Wilmot-Sitwell (Director)
Citizenship:            British
Business Address:       40 Holborn Viaduct
                        London, England EC1N 2PQ
Principal Occupation:   Chairman, Mercury World Mining Trust
 
Name:                   G. S. Young (Executive Director)
Citizenship:            South African
Business Address:       Praca de Republica, 497-8 andar,
                        01045 - San Paulo - SP, Brazil
Principal Occupation:   Executive Director, Minorco
<PAGE>
 

                                                             Page 30 of 43 Pages


VII. The following table sets forth certain information concerning each of the
Directors and Officers of Taurus Investments.

The following list sets forth the names of certain Directors and Officers of
Taurus Investments and the sections of this Annex "A" in which other information
concerning them is set out, to which sections reference is hereby made:
 
D.E. FISHER             (Director)                         SECTION IV
A.W. LEA                (Director)                         SECTION IV


Name:                   N. Jordan (Director and Secretary)
Citizenship:            British
Business Address:       9 rue Sainte Zithe
                        L-2763 Luxembourg City, Luxembourg
Principal Occupation:   Secretary, Minorco
 
Name:                   D.A. Turner (Director)
Citizenship:            British
Business Address:       9 rue Sainte Zithe
                        L-2763 Luxembourg City, Luxembourg
Principal Occupation:   Senior Vice President, Finance, Minorco
<PAGE>
                                                                                

                                                             Page 31 of 43 Pages


VIII. The following table sets forth certain information concerning each of the
Directors and Officers of Taurus International.

The following list sets forth the names of certain Directors and Officers of
Taurus International and the sections of this Annex "A" in which other
information concerning them is set out, to which sections reference is hereby
made:

D. E. FISHER            (Director)                         SECTION IV
N. JORDAN               (Director and Secretary)           SECTION VII
D. A. TURNER            (Director)                         SECTION VII
<PAGE>
 
                                                             Page 32 of 43 Pages


IX. The following table sets forth certain information concerning each of the
Executive Directors, Directors, Alternate Directors and other Officers of AAC.

The following list sets forth the names of certain Executive Directors,
Directors, Alternate Directors and Officers of AAC and the sections of this
Annex "A" in which other information concerning them is set out, to which
sections reference is hereby made:
<TABLE>
<CAPTION>
 
<S>                          <C>                                <C>   
P. C. D. BURNELL             (Director)                         SECTION VI
E. P. GUSH                   (Executive Director and     
                             Deputy Chairman)                   SECTION VI
M. W. KING                   (Executive Director)               SECTION VI
A. W. LEA                    (Director)                         SECTION IV
N. F. OPPENHEIMER            (Deputy Chairman and        
                             Executive Director)                SECTION VI
G. W. H. RELLY               (Executive Director)               SECTION VI
H. R. SLACK                  (Director)                         SECTION IV
J. OGILVIE THOMPSON          (Chairman and Executive     
                             Director)                          SECTION VI
T. C. A. WADESON             (Group Technical Director)         SECTION VI
G. S. YOUNG                  (Executive Director)               SECTION VI
 
</TABLE>
Name:                        B. Ainsley (Alternate Director)
Citizenship:                 British
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Alternate Director and Manager - Operations,
                             Diamond Services Division, AAC

Name:                        P. M. Baum (Alternate Director)
Citizenship:                 South African
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Alternate Director, AAC and Chief Executive,
                             Anglo American Corporation Services Limited 
                             (Services Company)

Name:                        W. G. Boustred (Executive Director and Deputy 
                             Chairman)
Citizenship:                 South African
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Executive Director and Deputy Chairman, AAC,
                             Director and Chairman, Anglo American Industrial
                             Corporation Limited (Industrial holding company)
                             ("Amic") and Director Anglo American Coal
                             Corporation Limited (Coal mining, treatment and
                             marketing company) ("Amcoal")

Name:                        L. Boyd (Executive Director)
Citizenship:                 South African
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Executive Director and Deputy Chairman, AAC
                             and Director and Chairman, Amic
<PAGE>
 
                                                             Page 33 of 43 Pages

Name:                        H. M. Brown (Alternate Director)
Citizenship:                 South African
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Alternate Director and Consulting Engineer,
                             AAC

Name:                        A. H. Calver (Alternate Director and Deputy
                             Technical Director)
Citizenship:                 British
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Deputy Technical Director, Engineering, AAC

Name:                        J. W. Campbell (Executive Director)
Citizenship:                 British
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Managing Director, De Beers
                             Industrial Diamond Division (Pty) Limited (Diamond
                             trading company), Director and Deputy Chairman, 
                             Amcoal

Name:                        G. A. Chalmers (Group Accountant)
Citizenship:                 South African
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Group Accountant, AAC

Name:                        T. N. Chapman (Director)
Citizenship:                 South African
Business Address:            Great Westerford, Rondebosch, 7700,
                             Republic of South Africa
Principal Occupation:        Director, Chief Executive and Chairman of
                             The Southern Life Association Limited (Life 
                             insurance company)

Name:                        R. M. Crawford (Alternate Director and Manager)
Citizenship:                 South African
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Alternate Director and Manager, Diamond
                             Services Division, AAC and Director of De Beers and
                             Centenary

Name:                        B.E. Davison (Director)
Citizenship:                 South African
Business Address:            28 Harrison Street, Johannesburg, 2001,
                             Republic of South Africa
Principal Occupation:        Director, AAC and Managing Director, Anglo
                             American Platinum Corporation Limited (Platinum 
                             investment company)

Name:                        A. D. Deuchar (Executive Director and Group 
                             Deputy Technical Director - Metallurgy)
Citizenship:                 Australian
Business Address:            44 Main Street, Johannesburg, 2001,
                             Republic of South Africa
<PAGE>
 
                                                             Page 34 of 43 Pages

Principal Occupation:    Executive Director and Group Deputy Technical Director
                         Metallurgy, AAC

Name:                    J. F. Drysdale (Alternate Director)
Citizenship:             British
Business Address:        44 Main Street, Johannesburg, 2001,
                         Republic of South Africa
Principal Occupation:    Alternate Director

Name:                    R. Edwards (Alternate Director)
Citizenship:             British
Business Address:        44 Main Street, Johannesburg, 2001,
                         Republic of South Africa
Principal Occupation:    Alternate Director and Manager - Geology,
                         Diamond Services Division, AAC

Name:                    C. T. Elphick (Director)
Citizenship:             South African
Business Address:        44 Main Street, Johannesburg, 2001,
                         Republic of South Africa
Principal Occupation:    Director, AAC and Director, E. Oppenheimer & Son 
                         (Pty) Ltd (Investment holding company)

Name:                    D. M. L. Farrv (Assistant Secretary)
Citizenship:             South African
Business Address:        44 Main Street, Johannesburg, 2001,
                         Republic of South Africa
Principal Occupation:    Assistant Secretary, AAC

Name:                    R. M. Godsell (Executive Director)
Citizenship:             South African
Business Address:        44 Main Street, Johannesburg, 2001,
                         Republic of South Africa
Principal Occupation:    Executive Director, AAC, Chairman and Chief
                         Executive, Gold and Uranium Division AAC and Director,
                         Amgold

Name:                    R. A. A. Gower (Alternate Director)
Citizenship:             South African
Business Address:        CDM Centre, 10 Bulow Street
                         Windhoek, 9000 Namibia
Principal Occupation:    Alternate Director, AAC

Name:                    R. A. Hambro (Alternate Director)
Citizenship:             British
Business Address:        J O Hambro & Company, Ltd.
                         30 Queen Anne's Gate
                         London SW1H 9AL, England
Principal Occupation:    Investment Bankers Director, J O Hambro & Company,
                         Limited (Investment banking firm)
<PAGE>
 
                                                             Page 35 of 43 Pages

Name:                   R. N. Hambro (Director)
Citizenship:            British
Business Address:       30 Queen Anne's Gate                             
                        J O Hambro & Company, Ltd            
                        London SW1H 9AL, England    
Principal Occupation:   Investment Bankers Director, J O Hambro & Company,
                        Limited (Investment banking firm)

Name:                   J. B. Hawthorne (Alternate Director and Deputy Technical
                        Director, Geology)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Deputy Technical Director - Geology, AAC

Name:                   M. J. Henrey (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Director of E. Oppenheimer and Son (Pty) Limited
                        (Investment holding firm)

Name:                   G. M. Holford (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Finance Manager, Financial Management and Consulting
                        Services, AAC

Name:                   J. A . Holmes (Director)
Citizenship:            British
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Director, AAC

Name:                   K. M. Hosking (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Managing Director, Anglo American Farms Limited
                        (Farming company).

Name:                   J. C. L. Keswick (Director)
Citizenship:            United Kingdom
Business Address:       41 Tower Hill
                        London EC3N 4HA, England
Principal Occupation:   Director and Chairman Hambros Bank Limited, Director
                        De Beers Consolidated, Director, De Beers and Centenary
<PAGE>
 
                                                             Page 36 of 43 Pages

Name:                   N. J. Keys (Alternate Director)
Citizenship:            Australian
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Projects Director, New Mining Business Division, AAC

Name:                   R. P. Lander (Executive Director)
Citizenship:            Zimbabwean
Business Address:       70 Samora Machel Avenue
                        Harare C.4, Zimbabwe
Principal Occupation:   Executive Director

Name:                   G. G. L. Leissner (Alternate Director)
Citizenship:            South African
Business Address:       First Floor, 11 Diagonal Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Managing Director, Anglo American Property Services
                        (Proprietary) Limited (Property development and
                        administration company); Director and Chairman of Anglo
                        American Properties Limited (Property investment
                        company)

Name:                   C. L. Maltby (Secretary)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa 
Principal Occupation:   Secretary, AAC

Name:                   N. Mayer (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001, Republic of South
                        Africa 
Principal Occupation:   Group Deputy Technical Director, AAC

Name:                   R.G. Mills (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Alternate Director and Group Deputy Technical 
                        Director - Mining, AAC

Name:                   A. E. Oppenheimer (Director)
Citizenship:            British
Business Address:       17 Charterhouse Street
                        London EC 1N 6RA, England
Principal Occupation:   Director and Deputy Chairman, The Diamond Trading
                        Company (Pty) Limited (Diamond trading company),
                        Director, De Beers and Centenary

Name:                   G. R Pardoe (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
<PAGE>
 
                                                             Page 37 of 43 Pages

                        Republic of South Africa
Principal Occupation:   Alternate Director and Financial Director,
                        Amic (industrial holding company)

Name:                   G. M. Ralfe (Director)
Citizenship:            South African
Business Address:       17 Charterhouse Street
                        London EC 1N 6RA England
Principal Occupation:   Director, The Diamond Trading Co. (Pty) Limited
                        (Diamond trading company); Director, De Beers and
                        Centenary

Name:                   D. Rankin (Executive Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Chairman, Amcoal

Name:                   R.S. Robertson (Alternate Director)
Citizenship:            British
Business Address:       40 Holborn Viaduct
                        London, England EC1N 2PQ
Principal Occupation:   Senior Vice President, Minorco and Alternate
                        Director AAC

Name:                   C. J. Saunders (Director)
Citizenship:            South African
Business Address:       The Tongaat-Hulett Group Ltd., Main Avenue, Maidstone,
                        4380, Republic of South Africa
Principal Occupation:   Executive Chairman, The Tongaat-Hulett Group Limited
                        (Industrial processing company), Director, Amic

Name:                   M. W. Spicer (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Public Affairs Consultant, AAC

Name:                   C. L. Sunter (Executive Director)
Citizenship:            British
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Chairman, Corporate Affairs, AAC and Director, 
                        Amgold

Name:                   A. J. Trahar (Executive Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Director and Deputy Chairman, Amic;
                        Executive Chairman, 
                        Mondi Limited (Paper manufacturer)

Name:                   D. J. van Jaarsveld (Alternate Director)
Citizenship:            South African
<PAGE>
 
                                                             Page 38 of 43 Pages
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Manager - International, Diamond Services Division, AAC

Name:                   K. H. Williams (Alternate Director)
Citizenship:            South African
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Director-Marketing, Gold and Uranium
                        Division, AAC and
                        Director, Amgold

Name:                   C. W. P. Yates (Alternate Director)
Citizenship:            British
Business Address:       44 Main Street, Johannesburg, 2001,
                        Republic of South Africa
Principal Occupation:   Alternate Director and Finance Manager, Corporate and
                        International Finance Department, AAC
<PAGE>
 
                                                             Page 39 of 43 Pages

X. The following table sets forth certain information concerning each of the
Directors and other Officers of Centenary.

The following list sets forth the names of the Chairman and certain Directors of
Centenary and the sections of this Annex "A" in which other information
concerning them is set out, to which sections reference is hereby made:

J. OGILVIE THOMPSON     (Director and Chairman)   SECTION VI
N. F. OPPPENHEIMER      (Director and Deputy
                         Chairman)                SECTION VI
J. W. CAMPBELL          (Director)                SECTION IX
R M. CRAWFORD           (Director)                SECTION IX
E. P. GUSH              (Director)                SECTION VI
J.C.L. KESWICK          (Director)                SECTION IX
A. E. OPPENHEIMER       (Director and President)  SECTION IX
G. W. H. RELLY          (Director)                SECTION VI
G. M. RALFE             (Director)                SECTION IX

Name:                   G. F. H. Burne (Director)
Citizenship:            British
Business Address:       17 Charterhouse Street
                        London, England EC 1N 6RA
Principal Occupation:   Member of the Executive Committee, The
                        Central Selling Organization

Name:                   T. W. H. Capon (Director)
Citizenship:            British
Business Address:       17 Charterhouse Street
                        London EC 1N 6RA, England
Principal Occupation:   Member of the Executive Committee, The Central Selling
                        Organization

Name:                   L. A. Lincoln (Director)
Citizenship:            South African
Business Address:       Langensandstrasse 27
                        CH 6000 Lucerne 14
                        Switzerland
Principal Occupation:   Director, De Beers and Centenary

Name:                   B. Marole (Director)
Citizenship:            Motswana
Business Address:       Private Bag 0018, Gaborone,
                        Botswana
Principal Occupation:   Permanent Secretary, Ministry of Mineral Resources and
                        Water Affairs, Botswana

Name:                   O. K. Matambo (Director)
Citizenship:            Motswana
Business Address:       Private Bag 008, Gaborone, Botswana
Principal Occupation:   Permanent Secretary, Ministry of Finance and
                        Development Planning, Botswana
<PAGE>
 
                                                             Page 40 of 43 Pages


Name:                   J. P. Pudnev (Director)
Citizenship:            British
Business Address:       17 Charterhouse Street, London, England EC1N 6RA
Principal Occupation:   Member of Executive Committee, The Central Selling
                        Organization
<PAGE>
 
                                                             Page 41 of 43 Pages

XI. The following table sets forth certain information concerning each of the
Directors and other Officers of De Beers.

The following list sets forth the names of the Chairman and certain Directors of
De Beers and the sections of this Annex A, to which sections reference is hereby
made:
 
J. OGILVIE THOMPSON    (Director and Chairman)   SECTION VI
N. F. OPPENHEIMER      (Director and Deputy
                        Chairman)                SECTION VI
G. F. H. BURNE         (Director)                SECTION X
J. W. CAMPBELL         (Director)                SECTION IX
T. W. H. CAPON         (Director)                SECTION X
R M. CRAWFORD          (Director)                SECTION IX
E. P. GUSH             (Director)                SECTION VI
J. C. L. KESWICK       (Director)                SECTION IX
L. A. LINCOLN          (Director)                SECTION X
B. MAROLE              (Director)                SECTION X
O. K. MATAMBO          (Director)                SECTION X
A. E. OPPENHEIMER      (Director)                SECTION IX
J. P. PUDNEY           (Director)                SECTION X
G. M. RALFE            (Director)                SECTION IX
G. W. H. RELLY         (Director)                SECTION VI
<PAGE>
 
                                                             Page 42 of 43 Pages

                       AGREEMENT CONCERNING JOINT FILING
                                OF SCHEDULE 13D


The undersigned agree as follows:

          (i) each of them is individually eligible to use the Schedule 13D to
which this Exhibit is attached, and such Schedule 13D is filed on behalf of each
of them; and

          (ii)  each of them is responsible for the timely filing of such
Schedule 13D and any amendments thereto, and for the completeness and accuracy
of the information concerning such person contained therein; but none of them is
responsible for the completeness or accuracy of the information concerning the
other persons making the filing, unless such person knows or has reason to
believe that such information is inaccurate.

This Agreement may be executed in any number of counterparts, each of which
shall be deemed to be an original, but all of which, taken together, shall
constitute one and the same instrument.

Dated: April 7, 1997
                               TERRA NITROGEN CORPORATION

                               By  /s/ George H. Valentine

                               Its  Vice President and General Counsel


                               TERRA CAPITAL, INC.

                               By  /s/ George H. Valentine

                               Its  Vice President and Corporate Secretary


                               TERRA CAPITAL HOLDINGS, INC.

                               By  /s/ George H. Valentine

                               Its  Vice President and Corporate Secretary


                               TERRA INDUSTRIES INC.

                               By  /s/ George H. Valentine

                               Its Senior Vice President, General Counsel and
                                     Corporate Secretary


 
<PAGE>
 
                                                             Page 43 of 43 Pages

                               TAURUS INTERNATIONAL S.A.

                               By /s/ Nick Jordan

                               Its Secretary


                               TAURUS INVESTMENTS S.A.

                               By /s/ Nick Jordan

                               Its Secretary


                               MINORCO

                               By /s/ Nick Jordan

                               Its Secretary


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