POTASH CORPORATION OF SASKATCHEWAN INC
DEF 14A, 1999-03-29
MINING & QUARRYING OF NONMETALLIC MINERALS (NO FUELS)
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<PAGE>   1
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                      ------------------------------------
                                  SCHEDULE 14A
                                 (RULE 14a-101)
 
                    INFORMATION REQUIRED IN PROXY STATEMENT
 
                            SCHEDULE 14A INFORMATION
                PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
                             (AMENDMENT NO.      )
 
  Filed by the Registrant                                                    [X]
 
  Filed by a Party other than the Registrant                                 [ ]
 
Check the appropriate box:
 
  [ ] Preliminary Proxy Statement
 
  [ ] Confidential, for Use of the Commission Only
     (as permitted by Rule 14a-6(e)(2))
 
  [X] Definitive Proxy Statement
 
  [ ] Definitive Additional Materials
 
  [ ] Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12
 
                      ------------------------------------
 
                    POTASH CORPORATION OF SASKATCHEWAN INC.
                (Name of Registrant as specified in its Charter)
 
         --------------------------------------------------------------
    (Name of Person(s) filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
[X] No fee required.
 
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
 
(1)  Title of each class of securities to which transaction applies:
 
(2)  Aggregate number of securities to which transaction applies:
 
(3)  Per unit price or other underlying value of transaction computed pursuant
     to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is
     calculated and state how it was determined):
 
(4)  Proposed maximum aggregate value of transaction:
 
(5)  Total fee paid:
 
     [ ] Fee paid previously with preliminary materials:
 
     [ ] Check box if any part of the fee is offset as provided by Exchange Act
        Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
        paid previously. Identify the previous filing by registration statement
        number, or the form or schedule and the date of its filing.
 
        (1)  Amount previously paid:
 
        (2)  Form, Schedule or Registration Statement No.:
 
        (3)  Filing Party:
 
        (4)  Date Filed:
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
<TABLE>
<S>                                 <C>                          <C>
C. E. CHILDERS                                                    POTASH CORPORATION OF SASKATCHEWAN
CHAIRMAN & CHIEF EXECUTIVE OFFICER              LOGO                                            INC.
</TABLE>
 
March 26, 1999
 
Dear Shareholder:
 
     You are invited to attend the Annual Meeting of shareholders of Potash
Corporation of Saskatchewan Inc. which will be held on Thursday, May 6, 1999 at
10:30 a.m. (local time) at the Ramada Hotel, 1st Avenue and 22nd Street,
Saskatoon, Saskatchewan, Canada.
 
     The Notice of Annual Meeting and Board of Directors Proxy Circular
describing the formal business of the meeting and related proxy are enclosed.
 
     If you are unable to attend this year's meeting, please carefully consider
the enclosed material and then complete and return your proxy in the envelope
provided.
 
                                          Sincerely,

                                          /s/ C. E. CHILDERS
                                          C. E. CHILDERS
 
                   PCS TOWER,   SUITE 500,   122 - 1ST AVENUE
                  SOUTH,   SASKATOON,   SASKATCHEWAN   S7K 7G3
<PAGE>   3
 
                                      LOGO
 
                    POTASH CORPORATION OF SASKATCHEWAN INC.
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
 
     NOTICE IS HEREBY GIVEN that the Annual Meeting of shareholders of Potash
Corporation of Saskatchewan Inc. (the "Corporation"), a Saskatchewan
corporation, will be held on Thursday, May 6, 1999 at 10:30 a.m. (local time) at
the Ramada Hotel, 1st Avenue and 22nd Street, Saskatoon, Saskatchewan, Canada
for the following purposes:
 
1.   to receive the financial statements of the Corporation for the year ended
     December 31, 1998 and the report of the auditors thereon;
 
2.   to elect directors;
 
3.   to appoint auditors for the Corporation; and
 
4.   to transact such other business as may properly come before the meeting or
     any adjournments thereof.
 
     DATED at Saskatoon, Saskatchewan this 26th day of March, 1999.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS

                                          /s/ JOHN L.M. HAMPTON
                                          JOHN L.M. HAMPTON
                                          Secretary
 
Shareholders who are unable to attend in person are requested to date, sign and
return, as soon as possible and in the envelope enclosed for that purpose, the
enclosed form of proxy.
<PAGE>   4
 
                                      LOGO
 
                    POTASH CORPORATION OF SASKATCHEWAN INC.
                       BOARD OF DIRECTORS PROXY CIRCULAR
                         ANNUAL MEETING OF SHAREHOLDERS
 
                            SOLICITATION OF PROXIES
 
     THIS PROXY CIRCULAR IS FURNISHED IN CONNECTION WITH THE SOLICITATION OF
PROXIES BY THE BOARD OF DIRECTORS (THE "BOARD") OF POTASH CORPORATION OF
SASKATCHEWAN INC. (THE "CORPORATION"), A SASKATCHEWAN CORPORATION, AND
CONSTITUTES A SOLICITATION BY OR ON BEHALF OF THE MANAGEMENT OF THE CORPORATION
UNDER THE BUSINESS CORPORATIONS ACT (SASKATCHEWAN), FOR USE AT THE ANNUAL
MEETING OF SHAREHOLDERS OF THE CORPORATION (THE "MEETING") TO BE HELD ON MAY 6,
1999 AND ANY ADJOURNMENTS THEREOF. All costs of solicitation will be borne by
the Corporation. In addition to the mail, proxies may be solicited by telephone
or in person by employees of the Corporation who will receive no additional
compensation for such services. The Corporation has retained Kissel-Blake, a
division of Shareholder Communications Corporation, to assist in the
solicitation of proxies in Canada and the United States for total estimated fees
of $17,500. In addition, the Corporation will reimburse brokers, nominees and
fiduciaries for reasonable expenses incurred by them in sending proxy material
to the beneficial owners of common shares of the Corporation (the "Shares") held
by such persons.
 
     A shareholder who has given a proxy may revoke it at any time before it is
exercised by attending the Meeting and voting in person or by replacing it with
a duly executed proxy bearing a later date. In addition to revocation in either
such manner, a shareholder giving a proxy may revoke the proxy by instrument in
writing executed by the shareholder or by his attorney authorized in writing and
deposited either at the registered and principal executive office of the
Corporation, Suite 500, 122 -- 1st Avenue South, Saskatoon, Saskatchewan,
Canada, S7K 7G3, at any time up to and including the last business day preceding
the day of the Meeting, or any adjournment thereof, or with the chairman of the
Meeting on the day of the Meeting or any adjournment thereof.
 
     This proxy circular and the accompanying Notice of Annual Meeting of
Shareholders and proxy will first be sent or given to shareholders on or about
March 26, 1999.
 
     Except as otherwise stated, the information contained herein is given as of
February 28, 1999.
 
     Unless otherwise specified, all dollar amounts are expressed in United
States dollars.
 
                                        3
<PAGE>   5
 
                                 VOTING SHARES
 
     There were 54,253,103 Shares of the Corporation outstanding as of February
28, 1999, each Share carrying the right to one vote.
 
     Each shareholder of record at the close of business on March 18, 1999 is
entitled to vote at the Meeting the Shares registered in his or her name on that
date except to the extent that he or she has transferred any of those Shares and
the transferee has both established the transferee's ownership of the
transferred Shares and demanded, not later than 10 days prior to the Meeting,
that the Corporation recognize the transferee as the person entitled to vote the
transferred Shares at the Meeting.
 
     The quorum for any meeting of shareholders is one or more persons present
and holding or representing by proxy not less than 5% of the total number of
outstanding Shares.
 
                              OWNERSHIP OF SHARES
 
     The following table sets forth information as of February 28, 1999, with
respect to the beneficial ownership of Shares held by the executive officers of
the Corporation named in the Summary Compensation Table herein and by all
directors and executive officers of the Corporation.
 
<TABLE>
<CAPTION>
                                                                     AMOUNT AND NATURE OF
                                                                     BENEFICIAL OWNERSHIP
NAME                                                                       (1)(2)(3)
- ----                                                             ------------------------
<S>                                                             <C>                            
  Charles E. Childers                                                       231,070

  William J. Doyle                                                          148,782

  Thomas J. Wright                                                           35,000

  Gary E. Carlson                                                            21,608

  James F. Dietz                                                             13,090

  All directors and executive officers as a group, including
     the above-named persons (26 persons)                                   982,079
</TABLE>
 
(1) The number of Shares beneficially owned is reported on the basis of
    regulations of the Securities and Exchange Commission, and includes Shares
    that the individual has the right to acquire at any time within 60 days
    after February 28, 1999 and Shares directly or indirectly held by the
    individual or by certain family members over which the individual has sole
    or shared voting or investment power.
(2) Each of the directors and executive officers of the Corporation owned less
    than 1% of the Shares issued and outstanding as at February 28, 1999. The
    directors and executive officers of the Corporation as a group beneficially
    owned approximately 1.8% of the Shares issued and outstanding as at February
    28, 1999.
(3) Includes Shares purchasable within 60 days after February 28, 1999 through
    the exercise of options granted by the Corporation, as follows: Mr. Childers
    230,000 Shares; Mr. Doyle 138,500 Shares; Mr. Wright 35,000 Shares; Mr.
    Carlson 18,750 Shares; Mr. Dietz 7,500 Shares and directors and executive
    officers as a group, including the foregoing, 938,450 Shares.
 
                                        4
<PAGE>   6
 
     Listed below is the name and other information concerning the only person
known to the Corporation (from Corporation records and reports filed with the
U.S. Securities and Exchange Commission on Schedule 13G) which owned, as of
February 28, 1999, more than 5% of any class of the Corporation's voting
securities:
 
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------
                                 NAME AND ADDRESS OF          AMOUNT AND NATURE OF
TITLE OF CLASS                     BENEFICIAL OWNER           BENEFICIAL OWNERSHIP    PERCENT OF CLASS(1)
- ----------------------------------------------------------------------------------------------------------
<S>                         <C>                               <C>                     <C>
  Common Shares             Philips, Hager & North              3,214,750(2)(3)               5.9%
                            Investment Management Ltd.
                            200 Burrard Street
                            Vancouver, B.C. V6C 3N5
- ----------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Represents percent of Shares outstanding as of February 28, 1999.
(2) Such person has sole voting and dispositive power as to all 3,214,750
    Shares.
(3) As set forth in a Schedule 13G dated January 12, 1999.
 
                             ELECTION OF DIRECTORS
 
     The articles of the Corporation provide that the Board shall consist of a
minimum of 6 directors and a maximum of 20, with the actual number to be
determined from time to time by the Board. The Board has determined that at the
present time there will be 15 directors.
 
     Proxies solicited hereby will be voted for the following proposed nominees
(or for substitute nominees in the event of contingencies not known at present)
who will, subject to the bylaws of the Corporation and applicable corporate law,
serve to hold office until the next annual meeting of shareholders or until
their successors are elected or appointed in accordance with the bylaws or
applicable corporate law. The affirmative vote of a plurality of the Shares
present in person or by proxy at the Meeting and voted in respect of the
election of directors is required to elect directors.
 
     The following table states the names and ages of all the persons to be
nominated for election as directors, all other positions and offices with the
Corporation now held by them, their present principal occupation or employment,
the period during which present directors of the Corporation have served as
directors, and the number of Shares beneficially owned, directly or indirectly,
or over which control or direction is exercised, by each of them.
 
<TABLE>
<CAPTION>
                                                                                     NUMBER OF SHARES
NAME AND PRINCIPAL OCCUPATION                              AGE   DIRECTOR SINCE   BENEFICIALLY OWNED(12)
- -----------------------------                              ---   --------------   ----------------------
<S>                                                        <C>   <C>              <C>
 
ISABEL ANDERSON(1).......................................  59         1989                19,903
President and Chief Executive Officer,
A&L Information Brokers (consulting company)
 
DOUGLAS J. BOURNE(4)(5)..................................  75         1990                 6,914
Retired, former Chairman and Chief Executive Officer,
Battle Mountain Gold Company (gold mining company)
 
CHARLES E. CHILDERS(1)(6)................................  66         1989               231,070
Chairman and Chief Executive Officer
of the Corporation
 
DENIS J. COTE(1)(3)(7)...................................  67         1989                17,785
Retired, former Chairman and Chief Executive Officer
of the UMA Group Limited (consulting engineers)
 
WILLIAM J. DOYLE.........................................  48         1989               148,782
President and Chief Operating Officer
of the Corporation
</TABLE>
 
                                        5
<PAGE>   7
 
<TABLE>
<CAPTION>
                                                                                     NUMBER OF SHARES
NAME AND PRINCIPAL OCCUPATION                              AGE   DIRECTOR SINCE   BENEFICIALLY OWNED(12)
- -----------------------------                              ---   --------------   ----------------------
<S>                                                        <C>   <C>              <C>
HONOURABLE WILLARD Z. ESTEY, Q.C.(2)(8)..................  79         1990                22,200
Retired, former Justice of the Supreme Court of Canada
 
DALLAS HOWE(2)...........................................  54         1991                 9,500
President and Chief Executive Officer,
Advanced Data Systems Ltd. and
BDM Information Systems Group of Companies
(international computer systems suppliers)
 
DONALD E. PHILLIPS(3)(9).................................  66         1991                 7,500
Retired, former President and Chief Executive Officer,
Pitman-Moore, Inc. (animal feed and health products
producer and marketer)
 
PAUL J. SCHOENHALS(4)....................................  57         1992                 6,600
President, Petroleum Industry Training Service
 
DARYL K. SEAMAN(3)(10)...................................  76         1989                 4,000
Chairman and President, Dox Investments Inc. (private
holding company); former Chairman and Chief Executive
Officer, Bow Valley Industries Ltd. (oil company)
 
E. ROBERT STROMBERG, Q.C.(1).............................  57         1991                12,189
Partner, Robertson Stromberg (law firm)
 
JACK G. VICQ(2)..........................................  59         1989                10,793
Professor of Accounting,
College of Commerce, University of Saskatchewan
 
BARRIE A. WIGMORE(3)(11).................................  57         1989                 9,500
Limited Partner, The Goldman Sachs Group, L.P.
(investment banking firm)
 
PAUL S. WISE(4)..........................................  78         1989                15,550
Retired, former President and Chief Executive Officer,
Alliance of American Insurers
 
THOMAS J. WRIGHT.........................................  66           --                35,000
President, PCS Phosphate Company, Inc. (PCS Phosphate),
a subsidiary of the Corporation
</TABLE>
 
- ---------------
(1)  Member of the Executive Committee.
(2)  Member of the Audit Committee.
(3)  Member of the Compensation Committee.
(4)  Member of the Environmental Affairs Committee.
(5)  Douglas J. Bourne is also a director of Battle Mountain Gold Company.
(6)  Charles E. Childers is also a director of Battle Mountain Gold Company.
(7)  Denis J. Cote is also a director of Startech Energy Inc.
(8)  Willard Z. Estey is also a director of CanWest Global Communications Corp.
     and Fundy Cable Ltd.
(9)  Donald E. Phillips is also a director of Synbiotics Inc. and Great Lakes
     REIT Inc.
(10) Daryl K. Seaman is also a director of Abacan Resource Corporation, Bow
     Valley Energy Ltd., Encal Energy Ltd. and Renaissance Energy Ltd.
(11) Barrie A. Wigmore is also a director of National Service Industries, Inc.
(12) Includes Shares purchasable within 60 days of February 28, 1999 through the
     exercise of options granted by the Corporation, as follows: Isabel Anderson
     16,000 Shares; Douglas J. Bourne 6,500 Shares;
 
                                        6
<PAGE>   8
 
     Charles E. Childers 230,000 Shares; Denis J. Cote 13,500 Shares; William J.
     Doyle 138,500 Shares; Willard Z. Estey 18,500 Shares; Dallas Howe 8,500
     Shares; Donald E. Phillips 6,500 Shares; Paul J. Schoenhals 6,500 Shares;
     Daryl K. Seaman 3,000 Shares; E. Robert Stromberg 10,500 Shares; Jack G.
     Vicq 10,200 Shares; Barrie A. Wigmore 8,500 Shares; Paul S. Wise 12,500
     Shares; and Thomas J. Wright 35,000 Shares.
 
     All of the above directors have had the principal occupation indicated for
the previous five years except as follows: Mr. Estey was Counsel to McCarthy
Tetrault (law firm) from 1988 to 1996; Mr. Stromberg was Counsel to Robertson
Stromberg from June 1993 to November 1994; Mr. Doyle was President of Potash
Corporation of Saskatchewan Sales Limited (and located in Chicago, Illinois)
prior to 1995, Executive Vice President, Potash and Sales, of the Corporation
from 1995 to March 1997, and President of PCS Sales from March 1997 to July
1998; from July 1993 to June 1998, Mr. Vicq was also Associate Dean of the
College of Commerce; Mr. Wright was President and Chief Executive Officer of
Texasgulf Inc. from 1993 to 1995 and Executive Vice President of PCS Phosphate
from 1995 to March 1997. Mr. Wright is expected to retire as President of PCS
Phosphate on June 30, 1999.
 
     The law firm of Robertson Stromberg has provided and continues to provide
legal services to the Corporation. E. Robert Stromberg is a partner of Robertson
Stromberg.
 
     During 1998, there were 7 meetings of the Board and the number of meetings
held by committees of the Board were: (i) Executive Committee -- 5; (ii) Audit
Committee -- 6; (iii) Compensation Committee -- 5; and (iv) Environmental
Affairs Committee -- 4. Each of the Corporation's directors attended at least
75% of the total of the meetings of the committees on which the director served
and the meetings of the Board.
 
                                        7
<PAGE>   9
 
                             EXECUTIVE COMPENSATION
 
SUMMARY COMPENSATION TABLE
 
     The following table sets forth compensation in respect of the individuals
who were, as at December 31, 1998, the Chief Executive Officer and the other
four most highly compensated executive officers of the Corporation (the "Named
Executive Officers").
 
                         SUMMARY COMPENSATION TABLE(1)
 
<TABLE>
<CAPTION>
                                                                                       LONG-TERM
                                                                                      COMPENSATION
                                                                                  AWARDS       PAYOUTS
                                               ANNUAL COMPENSATION              SECURITIES
                                                                   OTHER        UNDERLYING
                                                                   ANNUAL         OPTIONS        LTIP         ALL OTHER
                                       SALARY       BONUS       COMPENSATION    GRANTED(3)     PAYOUTS       COMPENSATION
NAME AND PRINCIPAL POSITION  YEAR        $           $(2)            $               #            $               $
<S>                         <C>     <C>          <C>          <C>              <C>           <C>          <C>                <C>
  Charles E. Childers        1998    1,200,000    2,100,000     1,044,155(4)      80,000        265,104         5,624(5)
  Chairman and               1997    1,100,000    2,100,000     1,009,660(4)      80,000      1,677,671        10,961(5)
  Chief Executive Officer    1996    1,000,000    1,000,000       659,582(4)      80,000      1,274,431        11,000(5)

  William J. Doyle,          1998      475,000      450,000            --(7)      50,000         63,625         8,157(8)
  President and Chief        1997      374,083      280,000       147,392(7)      40,000         81,938         8,072(8)
  Operating Officer(6)       1996      356,500      500,000       273,011(7)      40,000        770,715         7,857(8)

  Thomas J. Wright,          1998      450,000      325,000               --      35,000         63,625        8,933(10)
  President,                 1997      433,200      325,000               --      35,000         81,938        8,840(10)
  PCS Phosphate(9)           1996      418,200      300,000               --      35,000        303,056        8,437(10)

  Gary E. Carlson            1998      325,000      235,000               --      25,000         47,718        8,476(13)
  President, PCS             1997      246,800      225,000               --      37,500         61,453        7,553(13)
  Sales(11)(12)

  James F. Dietz,            1998      277,500      200,000               --      25,000         29,692        9,290(16)
  President, PCS Nitrogen,   1997      207,333      140,000               --      15,000         38,238        8,852(16)
  Inc.(14)(15)
</TABLE>
 
(1)  Those amounts which were denominated in Canadian dollars have been
     converted to United States dollars using the average exchange rate for the
     month prior to the date of payment.
(2)  Reports amounts awarded pursuant to the Corporation's Short-Term Incentive
     Plan and, where applicable, contractual bonuses. See "Compensation
     Committee -- Short-Term Incentive Compensation".
(3)  Options granted pursuant to the Corporation's Stock Option Plan -- Officers
     and Key Employees.
(4)  Mr. Childers' employment contract provides for reimbursement to him in
     respect of the differential between Canadian and U.S. income taxes. See
     "Employment Contracts and Termination of Employment". The amount for 1998
     is not presently calculable and will be determined following the filing of
     Mr. Childers' Canadian and U.S. income tax returns; however, an advance of
     $245,259 was paid during 1998. Of the other annual compensation amount
     indicated for 1998, $546,186 reflects a 1998 payment made by the
     Corporation to Revenue Canada in settlement of a benefits audit for the
     years 1994 through 1996. Of the other annual compensation indicated for
     1997, $122,018 related to personal travel benefits.
(5)  The reported amounts for 1998, 1997 and 1996 consist, respectively, of:
     (i)   $0, $4,957 and $4,930 which represents the Corporation's contribution
           to the Corporation's defined contribution pension plan (see "Pension
           Plans"); and
     (ii)  $5,624, $6,004 and $6,070 which represents the value of the benefit
           for group term life insurance premiums paid by the Corporation.
(6)  Prior to July 1, 1998, Mr. Doyle's principal position was President, PCS
     Sales, and prior to March 6, 1997, Executive Vice President, Potash and
     Sales of the Corporation.
 
                                        8
<PAGE>   10
 
(7)  Mr. Doyle is entitled to a reimbursement in respect of the differential
     between Canadian and U.S. income taxes. The amount for 1998 is not
     presently calculable and will be determined following the filing of Mr.
     Doyle's Canadian and U.S. income tax returns.
(8)  The reported amounts for 1998, 1997 and 1996 consist, respectively, of:
     (i)   $4,708, $4,981 and $4,926 which represents the Corporation's
           contribution to the Corporation's defined contribution pension plan
           (see "Pension Plans"); and
     (ii)  $3,449 $3,091 and $2,931 which represents the value of the benefit
           for group term life insurance premiums paid by the Corporation.
(9)  Prior to March 6, 1997, Mr. Wright's principal position was Executive Vice
     President, PCS Phosphate.
(10) The reported amounts for 1998, 1997 and 1996 consist, respectively, of:
     (i)   $8,000, $8,000 and $7,500 which represents the Corporation's
           contribution to the 401(k) Plan of PCS Phosphate; and
     (ii)  $933, $840, and $937 which represents the value of the benefit for
           group term life insurance premiums paid by PCS Phosphate.
(11) Prior to July 1, 1998, Mr. Carlson's principal position was President, PCS
     Nitrogen, Inc. ("PCS Nitrogen").
(12) On March 6, 1997, the Corporation acquired Arcadian Corporation (now PCS
     Nitrogen). The compensation reported for Mr. Carlson for 1997 is for the
     period from March 1, 1997 to December 31, 1997.
(13) The reported amounts for 1998 and 1997 consist, respectively, of:
     (i)   $6,400 and $6,651 which represents amounts paid or payable under the
           terms of the 401(k) Plan of PCS Nitrogen; and
     (ii)  $2,076 and $902 which represents the value of the benefit for group
           term life insurance premiums paid by PCS Nitrogen.
(14) Prior to July 1, 1998, Mr. Dietz's principal position was Executive Vice
     President, PCS Nitrogen.
(15) On March 6, 1997, the Corporation acquired Arcadian Corporation (now PCS
     Nitrogen). The compensation for Mr. Dietz for 1997 is for the period from
     March 1, 1997 to December 31, 1997.
(16) The reported amounts for 1998 and 1997 consist, respectively, of:
     (i)   $6,400 and $6,709 which represents the amounts paid or payable under
           the terms of PCS Nitrogen's 401(k) Plan (see "Pension Plans"); and
     (ii)  $2,890 and $2,143 which represents the value of the benefit for group
           term life insurance premiums paid by PCS Nitrogen.
 
                                        9
<PAGE>   11
 
OPTIONS
 
     The following table sets forth the grants of stock options to the Named
Executive Officers pursuant to the Corporation's Stock Option Plan -- Officers
and Key Employees for the year ended December 31, 1998.
 
                            OPTION GRANTS DURING THE
                      MOST RECENTLY COMPLETED FISCAL YEAR
 
<TABLE>
<CAPTION>
 
- ---------------------------------------------------------------------------------------------------------------------------------
                                                        INDIVIDUAL GRANTS
                                NUMBER OF
                                SECURITIES
                                UNDERLYING       % OF TOTAL OPTIONS     EXERCISE OR                            GRANT DATE
                                 OPTIONS        GRANTED TO EMPLOYEES    BASE PRICE                            PRESENT VALUE
  NAME                          GRANTED(1)#        IN FISCAL YEAR         $/SHARE        EXPIRATION DATE          (2)$
<S>                             <C>             <C>                    <C>             <C>                   <C>             <C>
  Charles E. Childers              80,000              10.19              67.875          Nov. 5, 2008          1,691,200

  William J. Doyle                 50,000               6.37              67.875          Nov. 5, 2008          1,057,000

  Thomas J. Wright                 35,000               4.46              67.875          Nov. 5, 2008            739,900

  Gary E. Carlson                  25,000               3.18              67.875          Nov. 5, 2008            528,500

  James F. Dietz                   25,000               3.18              67.875          Nov. 5, 2008            528,500
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Options granted on November 5, 1998. Each option is exercisable with respect
    to one-half of the indicated number on or after November 5, 1999 and with
    respect to the balance of the indicated number on or after November 5, 2000
    (or earlier in the event of a "change of control" of the Corporation as
    defined in the Corporation's Stock Option Plan -- Officers and Key
    Employees). All options are transferable (without consideration) to the
    spouse, children and grandchildren of the original optionee (or to a trust,
    partnership or limited liability company, the entire beneficial interest of
    which is held by one or more of the foregoing persons), in accordance with
    the terms and conditions of the Stock Option Plan -- Officers and Key
    Employees.
(2) The Modified Black-Scholes Option Pricing Model was used to determine the
    grant date present value of the stock options granted in November, 1998 by
    the Corporation to the Named Executive Officers. Under the Modified
    Black-Scholes Option Pricing Model, the grant date present value of the
    stock options referred to in the table was $21.14 per Share. The material
    assumptions and adjustments incorporated in the Modified Black-Scholes
    Option Pricing Model in estimating the value of options reflected in the
    above table include the following:
     (i)   an interest rate of 4.83% (representing the interest rate on a U.S.
           Treasury security with a maturity date corresponding to that of the
           option term);
     (ii)  volatility of 29.99% (calculated using daily stock prices on the New
           York Stock Exchange for the one-year period prior to the grant date);
     (iii) dividends at the rate of $0.92 per Share (representing the annualized
           dividends paid with respect to a Share at the date of grant); and
     (iv)  a reduction of approximately 26% to reflect the probability of
           forfeiture due to termination prior to vesting and the probability of
           a shortened option term due to termination of employment prior to the
           option expiration date.
 
    The ultimate values of the options will depend on the future market price of
    the Shares, which cannot be forecast with reasonable accuracy. The actual
    value, if any, an optionee will realize upon exercise of an option will
    depend on the excess of the market value of the Shares over the exercise
    price on the date the option is exercised.
 
                                       10
<PAGE>   12
 
     The following table sets forth the options exercised during the year ended
December 31, 1998 by the Named Executive Officers and the year-end value of
unexercised in-the-money options held by such individuals at December 31, 1998.
 
         AGGREGATED OPTION EXERCISES DURING THE MOST RECENTLY COMPLETED
                 FISCAL YEAR AND FISCAL YEAR-END OPTION VALUES
<TABLE>
<CAPTION>
                                                                              NUMBER OF                 VALUE OF UNEXERCISED
                                                                        SECURITIES UNDERLYING           IN-THE-MONEY OPTIONS
                                                                          OPTIONS AT FY-END                 AT FY-END(1)

                                 SECURITIES                        
                                 ACQUIRED ON     AGGREGATE VALUE                          #                               $
                                  EXERCISE          REALIZED              #              NOT              $              NOT
     NAME                             #                 $            EXERCISABLE     EXERCISABLE     EXERCISABLE     EXERCISABLE
<C>  <S>                       <C>             <C>                 <C>             <C>             <C>             <C>
     Charles E. Childers               --                  --          230,000         120,000        1,760,354              --

     William J. Doyle              21,300           1,509,100          138,500          70,000        1,306,813              --

     Thomas J. Wright              47,500             933,563           35,000          52,500               --              --

     Gary E. Carlson                   --                  --           18,750          43,750               --              --

     James F. Dietz                    --                  --            7,500          32,500               --              --
 
</TABLE>
 
(1) Values are calculated by determining the amount by which the market value of
    the Shares underlying the options on December 31, 1998 exceeded the exercise
    prices of the options and converting Canadian dollar amounts to United
    States dollars using the December 31, 1998 exchange rate of $0.6534
 
PENSION PLANS
 
     The Potash Corporation of Saskatchewan Inc. Pension Plan (the "PCS Plan")
generally requires all participating employees to contribute 5.5% of their
earnings (or such lesser amount as is deductible for Canadian Income Tax
purposes) to the PCS Plan and the Corporation to contribute an equal amount.
When an individual retires, the full amount in the individual's account is used
to produce the pension.
 
     PCS Sales, prior to and during 1998, maintained a pension plan for U.S.
employees organized under Section 401(k) of the U.S. Internal Revenue Code (the
"Code") (the "PCS Sales Plan"). The PCS Sales Plan allows PCS Sales to match
employee contributions, typically up to 5.5% of the employees' earnings, to the
maximum amount allowable under U.S. law. The PCS Plan and the PCS Sales Plan are
generally available, as applicable, to all salaried employees of those
corporations and a portion of unionized employees.
 
     The Corporation has a Supplemental Retirement Income Plan (the
"Supplemental Plan") which is unfunded and non-contributory and which provides a
supplementary pension benefit for the Corporation's officers and certain other
key managers. Under the basic terms of the Supplemental Plan a pension benefit
is provided in an amount equal to 2% of the participant's average three highest
years' earnings multiplied by the participant's years of pensionable service (to
a maximum of 35 years), minus any annual retirement benefit payable under the
PCS Plan or the PCS Sales Plan. Benefits under the Supplemental Plan are paid in
the currency in which the participant's earnings are denominated. For a
designated group of senior officers of the Corporation, including Messrs.
Childers and Doyle, the benefit payable is an amount equal to: (i) 5% of the
senior officer's average three highest years' earnings multiplied by the senior
officer's years of pensionable service (to a maximum of 10 years), plus (ii) 2%
of the senior officer's average three highest years of earnings multiplied by
the senior officer's years of pensionable service in excess of 25 years to a
maximum of 10 additional years, minus (iii) any annual retirement benefit
payable under the PCS Plan or the PCS Sales Plan. Benefits payable to employees
who have reached the minimum age (55) for retirement pursuant to the
Supplemental Plan are secured by letters of credit provided by the Corporation.
 
                                       11
<PAGE>   13
 
     The following table shows the estimated annual benefits payable upon
retirement to Mr. Childers and Mr. Doyle pursuant to the Supplemental Plan.
Estimated benefits payable pursuant to the Supplemental Plan will be reduced by
any benefits payable pursuant to the PCS Plan or the PCS Sales Plan.
 
                   SUPPLEMENTAL RETIREMENT INCOME PLAN TABLE
 
<TABLE>
<S>                        <C>               <C>               <C>               <C>               <C>
    REMUNERATION                                             YEARS OF SERVICE
          $                     15                20                25                30                35
      $ 250,000             $ 125,000         $ 125,000         $ 125,000         $ 150,000         $ 175,000
        500,000               250,000           250,000           250,000           300,000           350,000
      1,000,000               500,000           500,000           500,000           600,000           700,000
      1,500,000               750,000           750,000           750,000           900,000         1,050,000
      2,000,000             1,000,000         1,000,000         1,000,000         1,200,000         1,400,000
      3,000,000             1,500,000         1,500,000         1,500,000         1,800,000         2,100,000
      4,000,000             2,000,000         2,000,000         2,000,000         2,400,000         2,800,000
</TABLE>
 
     For the purposes of the Supplemental Plan, earnings are defined as the
executive's "annual base pay plus 100% of all bonuses paid or payable to the
executive in a calendar year" (see, however, "Employment Contracts and
Termination of Employment -- Chief Executive Officer"). The normal retirement
age pursuant to the Supplemental Plan is 65, with a reduction in benefits for
early retirement prior to age 62. No benefits pursuant to the Supplemental Plan
are payable if termination occurs prior to age 55.
 
     As of December 31, 1998, the three highest year average earnings for
purposes of the Supplemental Plan for each Named Executive Officer participating
in the Supplemental Plan were as follows: $3,205,735 for Mr. Childers and
$1,128,676 for Mr. Doyle. The estimated credited years of service at assumed
retirement age of 65 for each of the Named Executive Officers participating in
the Supplemental Plan (age 67 for Mr. Childers) are as follows: 12.33 years for
Mr. Childers and 28 years for Mr. Doyle.
 
     PCS Phosphate, prior to and during 1998, maintained a defined benefit
pension plan (the "PCS Phosphate Plan") for all eligible U.S. employees,
including Mr. Wright. Under the PCS Phosphate Plan, employees were required to
contribute 1% of their base salary to the plan each year. PCS Phosphate
contributions are required whenever plan assets are not sufficient to meet
applicable funding standards. For employees age 60 (62 for those who became plan
participants on or after January 1, 1997) or older with at least 20 years of
service, the PCS Phosphate Plan provided for a retirement benefit of 2% of the
employee's final average compensation (as defined below) multiplied by the
employee's years of service (maximum 35 years) in the form of a life annuity
with 120 monthly payments guaranteed. Employees who did not meet the minimum age
or years of service requirement receive a reduced benefit.
 
     PCS Phosphate also maintains a Supplemental Benefit Plan (the "Phosphate
Supplemental Plan") which is unfunded and non-qualified. The purpose of the
Supplemental Benefit Plan is to enable PCS Phosphate to continue to provide the
same net benefits to employees whose benefits under the PCS Phosphate Plan are
limited by the Code, including Mr. Wright.
 
                                       12
<PAGE>   14
 
     The following table represents an estimate of the combined retirement
income of Mr. Wright from the PCS Phosphate Plan and Phosphate Supplemental Plan
at the levels of average compensation and the years of service shown.
 
                        PCS PHOSPHATE PENSION PLAN TABLE
 
<TABLE>
<S>                        <C>               <C>               <C>               <C>               <C>
    REMUNERATION                                             YEARS OF SERVICE
          $                     15                20                25                30                35
      $250,000              $ 75,000          $100,000          $125,000          $150,000          $175,000
       300,000                90,000           120,000           150,000           180,000           210,000
       400,000               120,000           160,000           200,000           240,000           280,000
       500,000               150,000           200,000           250,000           300,000           350,000
       600,000               180,000           240,000           300,000           360,000           420,000
</TABLE>
 
     Pursuant to the PCS Phosphate Plan and Phosphate Supplemental Plan, final
average compensation is defined as compensation for the highest paid 60
consecutive months of service out of the last 120 consecutive months of service.
Compensation is defined as a participant's base pay. The benefits available
under the PCS Phosphate Plan and Phosphate Supplemental Plan are not subject to
offset for other retirement benefits. As of December 31, 1998, the final average
compensation for purposes of the PCS Phosphate Plan and the Phosphate
Supplemental Plan for Mr. Wright was $419,280. The estimated credited years of
service at a retirement age of 67 for Mr. Wright is 33 years.
 
     PCS Nitrogen, prior to and during 1998, maintained a defined benefit
pension plan (the "Nitrogen Pension Plan") for all employees, except the
employees covered by collective bargaining agreements. Mr. Carlson and Mr. Dietz
are participants in the PCS Nitrogen Plan. The normal retirement benefit under
the Nitrogen Pension Plan, which is payable monthly beginning the first day of
the month after participants reach the normal retirement age of 65, is a life
annuity. The normal monthly retirement benefit is generally the sum of (i) 1.1%
of the participant's average monthly pay during the highest paid 60 consecutive
calendar months of the last 120 calendar months of employment multiplied by the
participant's credited service and (ii) 0.4% of (a) the excess of such average
monthly pay over the participant's Social Security earnings limit multiplied by
(b) the participant's credited service (up to a maximum of 35 years). Employees
who do not meet the age or years of service requirements for a normal retirement
benefit receive a reduced benefit.
 
     The following table represents an estimate of the retirement income of Mr.
Carlson and Mr. Dietz from the Nitrogen Pension Plan.
 
                        PCS NITROGEN PENSION PLAN TABLE
 
<TABLE>
<S>                        <C>               <C>               <C>               <C>               <C>
    REMUNERATION                                             YEARS OF SERVICE
          $                     15                20                25                30                35
      $200,000               $41,000           $55,000           $69,000           $83,000           $97,000
       300,000                64,000            85,000           106,000           128,000           149,000
       400,000                86,000           115,000           144,000           173,000           202,000
       500,000               109,000           145,000           181,000           218,000           254,000
       600,000               131,000           175,000           219,000           263,000           307,000
       700,000               154,000           205,000           256,000           308,000           359,000
</TABLE>
 
     For the purposes of the Nitrogen Pension Plan, compensation includes the
participant's base pay plus bonus. The foregoing calculations use the applicable
social security earning limit based on Mr. Carlson's year
 
                                       13
<PAGE>   15
 
of birth, 1953, which limit does not differ materially from that applicable to
Mr. Dietz. The benefits under the Nitrogen Pension Plan are subject to the
applicable Code limitations. However, the Company is developing an appropriate
supplemental employment retirement plan to address such limitations. The
benefits available under the Nitrogen Pension Plan are not subject to offset for
other retirement benefits. As of December 31, 1998, the final average
compensation for the purposes of the Nitrogen Pension Plan for Mr. Carlson was
$550,000 and for Mr. Dietz was $417,500 (assuming implementation of the
supplemental plan). The estimated credited years of service at normal retirement
age of 65 for Mr. Carlson is 27.5 years and for Mr. Dietz is 17 years.
 
     Effective January 1, 1999, the Corporation consolidated its pension and
benefit plans for U.S. employees. Under the sponsorship of PCS Administration
(USA), Inc., a newly formed benefits subsidiary, a new U.S. 401(k) Plan and a
new U.S. Pension Plan are being provided to eligible U.S. employees. A portion
of the PCS Sales Plan has been combined with PCS Phosphate's existing 401(k)
Plan to form the new U.S. 401(k) Plan. Similarly, the Phosphate Pension Plan and
Nitrogen Pension Plan have now been combined to form the U.S. Pension Plan. The
calculation of benefits under the new U.S. Pension Plan will be made using a new
formula for service after December 31, 1998 which provides a retirement benefit
of 1.5% of the employee's final average compensation multiplied by the
employee's years of service (maximum 35 years). The calculation of benefits for
an employee's pre-1999 service will be based on the applicable pension plans
prior to the consolidation.
 
EMPLOYMENT CONTRACTS AND TERMINATION OF EMPLOYMENT
 
Chief Executive Officer
 
     The terms and conditions of Mr. Childers' employment with the Corporation
are governed by an employment agreement, the current term of which expires June
30, 2002 and pursuant to which Mr. Childers shall serve as Chairman of the Board
and Chief Executive Officer of the Corporation until June 30, 1999 and
thereafter as Chairman of the Board and as a special advisor to the Corporation
to June 30, 2002. Pursuant to the agreement, Mr. Childers' salary compensation
was $1,200,000 for the year ended December 31, 1998 and will be $650,000 for the
period January 1, 1999 to June 30, 1999 and, thereafter, the annual amount of
$300,000 (less any amount paid for his role as Chairman and as a director) until
June 30, 2002. In addition to amounts payable to Mr. Childers pursuant to the
agreement or any other benefit plan or program, Mr. Childers is entitled, while
he holds the position of Chairman and Chief Executive Officer, to additional
compensation equal to any amount paid to him pursuant to the Corporation's Short
Term Incentive Plan. Such additional compensation shall be excluded from the
definition of earnings pursuant to the Supplemental Plan. Mr. Childers'
agreement provides for reimbursement to him on an annual basis of the amount by
which income taxes payable in Canada exceed those which otherwise would have
been payable in the United States. The employment agreement authorizes the use
of the principal corporate aircraft for all business and personal travel.
 
     The employment agreement for Mr. Childers provides for payment, upon
termination without cause, of an amount equal to the amounts payable for the
remaining term of the agreement. In the event of termination, for any reason,
the Corporation will provide a comprehensive medical, vision and dental
insurance plan for Mr. Childers equivalent to the medical, vision and dental
plan currently in existence, which plan shall remain in effect for the lifetime
of Mr. Childers. The Corporation will also pay reasonable moving expenses of Mr.
Childers upon termination of the agreement for any reason, including expiry of
the term. Pursuant to the agreement, in the event that the Corporation is sold,
dissolved, merged or amalgamated, Mr. Childers shall retain his position on the
same terms as in the agreement or, in the alternative, the Corporation shall
compensate Mr. Childers in the same manner as provided for in the agreement.
 
Change in Control Agreements
 
     Effective December 30, 1994, the Corporation, and where applicable, PCS
Sales, entered into Change in Control Agreements with each of Mr. Childers and
Mr. Doyle. The initial term of each Change in Control Agreement was to December
31, 1997; however, the Change of Control Agreements were automatically
 
                                       14
<PAGE>   16
 
renewed to December 31, 1998 and continue to be subject to automatic renewal for
successive one year terms until the employee reaches age 65 or unless either
party gives notice of termination. A change in control of the Corporation will
be deemed to have occurred if:
 
     (a)  there is a significant (50 percent or more) change in the Board within
          any two year period, not including replacement directors approved for
          nomination by the Board;
 
     (b)  there occurs an amalgamation, merger, consolidation, or other
          transaction whereby the control of the existing shareholders of the
          Corporation is diluted to less than 50 percent control of the
          surviving or consolidated entity;
 
     (c)  there occurs a significant (50 percent or more based on book value)
          sale or other disposition of the fixed assets of the Corporation
          within any twelve month period; or
 
     (d)  any party acquires 20 percent or more of the voting securities of the
          Corporation.
 
     Benefits pursuant to the Change in Control Agreements will be payable upon
termination of the executive's employment within two years following a change in
control. Termination of the executive's employment is defined to include the
executive ceasing to be employed for any reason, including constructive
dismissal, except by reason of death, disability, resignation or voluntary
retirement, or dismissal for dishonest or wilful misconduct.
 
     The severance benefit entitlements upon termination of employment following
a change in control of the Corporation are:
 
     (a)  a lump sum payment of three times the executive's base salary and
          average bonus for the last three years;
 
     (b)  a lump sum payment of the pro-rata target bonus for the short year in
          which termination occurs;
 
     (c)  immediate vesting and cash out of all outstanding LTIP awards;
 
     Payments to be made pursuant to the foregoing and relating to the
employee's bonus may be deferred by the executive for up to three years or for
such other period as may be permitted by the Income Tax Act (Canada);
 
     (d)  a credit of three additional years of service under the Supplemental
          Plan;
 
     (e)  three year continuation of medical, disability, and group term life
          insurance. These terminate, however, upon obtaining similar coverage
          from a new employer or upon commencement of retiree benefits; and
 
     (f)  financial or outplacement counselling to a maximum of Cdn$10,000.
 
     All outstanding non-exercisable options granted to the executive pursuant
to the Corporation's stock option plan for officers and key employees will
become exercisable upon a change in control occurring. In the event no public
market for the shares exists, the Corporation (or PCS Sales as the case may be)
will compensate the executive for the value of his options on the basis of a
share value approved by the shareholders of the Corporation upon a change in
control, or, if no such value has been approved, then based upon the market
value of the Shares when last publicly traded. For Mr. Childers and Mr. Doyle,
there is provision for a "gross up" of payments to cover excise taxes if payable
in respect of such benefits.
 
     For Mr. Childers, the following additional provisions apply to his Change
in Control Agreement:
 
     (a)  termination of employment is defined to include, in addition to the
          matters set forth above, voluntary resignation in the thirteenth month
          following the month in which the change in control occurs;
 
     (b)  benefits are payable under the Change of Control Agreement only if the
          termination of employment occurs on or prior to June 30, 1999, in
          which case such benefits are in full satisfaction of any
 
                                       15
<PAGE>   17

          rights, whether at common law or under contract, which Mr. Childers 
          might otherwise have on termination of employment;
 
     (c)  in addition to severance benefits set forth above, benefits payable
          under the Change in Control Agreement include the provision of a
          comprehensive medical insurance plan which shall remain in force for
          the lifetime of Mr. Childers; and
 
     (d)  the agreement is subject to automatic renewal for one year terms until
          December 31, 1999 or unless either party gives notice of termination.
 
Other
 
     The current severance policy of the Corporation for termination without
cause, which is applicable to all salaried employees including the Named
Executive Officers, is notice of impending termination, or payment of salary in
lieu of notice, equivalent to one month for each complete year of service plus
an additional two months. Such policy is superseded by specific termination
provisions contained in a written agreement.
 
     Prior to 1996, Mr. Wright contributed to a Deferred Compensation Plan.
Pursuant to this plan, Texasgulf Inc. (now PCS Phosphate) and Mr. Wright entered
into a Deferred Compensation Agreement dated August 30, 1985, as amended, under
which a portion of the salary otherwise payable to Mr. Wright was irrevocably
deferred and credited to an unfunded account which is payable in ten annual
instalments beginning in the year following the year he retires or otherwise
ceases to be an employee of PCS Phosphate. The unfunded account balance,
$609,599 as at December 31, 1998, accumulates interest compounded quarterly at a
rate equal to the quoted rate for 90-day unsecured commercial paper.
 
                             COMPENSATION COMMITTEE
 
COMPOSITION OF THE COMPENSATION COMMITTEE
 
     The following individuals served as members of the Compensation Committee
during the fiscal year which ended on December 31, 1998.
 
Denis J. Cote (Chairman)
Donald E. Phillips
Daryl K. Seaman
Barrie A. Wigmore
 
COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION
 
     The Compensation Committee of the Board (the "Committee") is, at present,
composed of four directors who are neither officers nor former officers of the
Corporation. The Committee is charged with formulating and making
recommendations to the Board in respect of compensation issues relating to
directors and senior officers of the Corporation. The Committee also makes
recommendations regarding the Corporation's Stock Option Plans and administers
its Short and Long-Term Incentive Plans, each in accordance with its terms. In
addition, the Committee, in consultation with the Chief Executive Officer,
considers and reports to the Board regarding corporate succession matters.
 
     Executive compensation policies are designed with the objective of
attracting and retaining qualified executives by providing compensation packages
which are competitive within the marketplace and by compensating them in a
manner which encourages individual performance consistent with shareholder
expectations.
 
Salary
 
     The Corporation has adopted a "broad band" salary system for senior
executives (i.e. vice presidents and above, but not including the chief
executive officer or subsidiary presidents) of the Corporation. Under the broad
band system a salary range is established by the Compensation Committee for each
senior executive
 
                                       16
<PAGE>   18
 
level after consultation with independent compensation consultants. Each
individual's salary is then set within the applicable range taking into account
the individual's duties, performance and experience. Individual executive
salaries are subject to approval by the Chief Executive Officer and the
Compensation Committee of the Board.
 
Short-Term Incentive Compensation
 
     The Corporation's Short-Term Incentive Plan is intended to aid in
developing strong corporate management by providing financial incentives to key
employees to meet or achieve objectives which contribute materially to the
Corporation's success. The plan provides for incentive awards based on an
individual's performance, position with the Corporation and the financial
results of the Corporation. Ranges of incentive awards are established for each
position, which awards are expressed as a percentage of annual salary. The
actual percentage used in calculating the award is generally determined by the
Corporation's return on equity in relation to a pre-established target, subject
to adjustment based upon the individual's performance and such other factors as
the Committee deems appropriate. Under the terms of the plan, generally no
payments are made when the return on equity is less than 50% of the target set
by the Board for that year. For senior executives, which include the Named
Executive Officers, incentive awards range from 20% to 100% of salary depending
upon actual return on equity as compared to target return on equity once the
minimum threshold requirement has been met, all subject to adjustment based on
the Executive's performance and such other factors as the Committee deems
appropriate.
 
Long-Term Incentive Compensation
 
     The Corporation's Long-Term Incentive Plan, as amended, is designed to
retain high-potential, high-value employees, to recognize and reward their
significant contributions to the long-term success of the Corporation, and to
align their interests more closely with the shareholders of the Corporation. The
plan provides for the discretionary grant of units to eligible employees
effective January 1, 1994 and January 1 every three years thereafter and on such
other dates as circumstances warrant. A unit is a notional amount equal to the
market value of a common share of the Corporation. The units are divided equally
into "part one" and "part two" units upon their grant. The number of units
granted to an eligible employee is approximately three times the amount
determined by dividing the employee's target bonus by the closing price of the
shares on the New York Stock Exchange on the first day preceding the date of the
grant of the units in which a round lot of shares was traded on such Exchange.
 
     The units are redeemed for cash on the basis of their "market value" on a
redemption date. The "market value" of a unit is the closing price of the shares
on the New York Stock Exchange on the first day preceding the redemption date in
which a round lot of shares was traded on such Exchange. Cash amounts payable
under the plan to employees who receive salary in Canadian currency shall be
converted to Canadian currency on the redemption date, based on the published
exchange rate of the Bank of Canada in effect as of the close of business on the
business day immediately preceding the redemption date. Redemption dates are
determined by the Committee in accordance with the terms of the plan. The
redemption date for the part one units may not be later than the last day of the
second calendar year following the calendar year of the grant of the units.
One-third of the part two units must be redeemed on or before each of the first,
second, and third anniversary of the grant of the units. However, in no event
shall the redemption date for the part two units be later than the end of the
second calendar year following the calendar year of the grant of the units.
 
     The number of part one units eligible to be redeemed on a redemption date
is subject to adjustment based upon the performance of the Corporation and the
employee, in accordance with criteria established by the Committee from time to
time. The Committee may, on or before a redemption date for part one units,
reduce or increase an employee's part one units by a maximum of 50%.
 
     The interests of management are also tied to the interests of the
Corporation's shareholders through the annual grant of options to executives and
other key employees pursuant to the Corporation's Stock Option Plan -- Officers
and Key Employees. The options are granted at 100% of market value, become
exercisable over two years (or earlier in the event of a "change of control" as
defined in the plan) and expire after ten
 
                                       17
<PAGE>   19
 
years. Options are granted having regard to the position in and contribution
made to the Corporation by the individual involved. The aggregate number of
Shares issuable after February 3, 1998 pursuant to options granted under the
Corporation's Stock Option Plan -- Officers and Key Employees is 6,926,125. The
number of shares subject to options granted to an individual is a function of
the individual's position within the Corporation and his or her ability to
affect corporate performance.
 
     In considering whether to grant options and how many shares are to be
subject to options, the Committee considers the aggregate number of options
outstanding and is also guided in such matters by applicable regulatory
constraints.
 
     In relative terms, greater emphasis within the compensation package is
given to annual cash compensation (salary and short-term incentives) than to
long-term incentives and options. However, each element of the package is
designed to complement the others in enabling the Corporation to achieve the
objectives of its compensation policies.
 
Chief Executive Officer Compensation
 
     The terms and conditions of Mr. Childers' employment with the Corporation
are governed by an employment agreement. Among other things, the agreement
provides that, in addition to receiving an annual salary, Mr. Childers is
entitled to participate in other compensation programs of general applicability
to senior corporate management.
 
     The Committee reviews annually the CEO's salary, any awards under the Short
and Long-Term Incentive Plans and any grant of options under the Corporation's
Stock Option Plan -- Officers and Key Employees. The CEO's annual salary is
determined primarily on the basis of his individual performance and the
performance of the Corporation. While no mathematical weighting formula exists,
the Committee considers all factors which it deems relevant including the net
income of the Corporation, the Corporation's share price, the duties and
responsibilities of the CEO and current compensation levels. Awards pursuant to
the Short and Long-Term Incentive Plans and under the Corporation's Stock Option
Plan -- Officers and Key Employees are made in accordance with the plans as
outlined above.
 
     Reference is also made to the compensation of chief executive officers of
an appropriate comparable group of fertilizer producers and marketers selected
by the Corporation. The comparison of Mr. Childers' compensation to the
comparable group incorporates many factors including the relative size of the
companies, their profitability and share price, the duties of the chief
executive officer and any other extenuating or special circumstances.
 
     Mr. Childers' compensation for 1998 as set forth in the Summary
Compensation Table was determined in accordance with the foregoing.
 
     Submitted on behalf of the Compensation Committee: Denis J. Cote, Donald E.
Phillips, Daryl K. Seaman, and Barrie A. Wigmore.
 
                                       18
<PAGE>   20
 
                               PERFORMANCE GRAPHS
 
     The following graph illustrates the Corporation's cumulative shareholder
return, assuming reinvestment of dividends, by comparing a Cdn$100 investment in
the Corporation's Shares at December 31, 1993 to the return on the TSE 300 Total
Return Index.

                            CUMULATIVE TOTAL RETURN
          BASED ON REINVESTMENT OF CDN$100 BEGINNING DECEMBER 31, 1993

                           [CUMULATIVE RETURN GRAPH]
 

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------
                                          DEC-93    DEC-94    DEC-95    DEC-96    DEC-97    DEC-98
- --------------------------------------------------------------------------------------------------
<S>                                       <C>       <C>       <C>       <C>       <C>       <C>
  Potash Corporation of Saskatchewan
    Inc. - TSE Listing                     $100      $146      $303      $371      $383      $321
- --------------------------------------------------------------------------------------------------
  TSE 300                                  $100      $100      $114      $147      $169      $166
- --------------------------------------------------------------------------------------------------
</TABLE>




                                       19
<PAGE>   21
 
     The following graph illustrates the Corporation's cumulative shareholder
return, assuming reinvestment of dividends, by comparing a $100 investment in
the Corporation's Shares at December 31, 1993 to the return on the Standard &
Poor's 500 Index and the shareholder return of a peer group of fertilizer
producers and marketers selected by the Corporation.

                            CUMULATIVE TOTAL RETURN
           BASED ON REINVESTMENT OF $100 BEGINNING DECEMBER 31, 1993

                        [CUMULATIVE TOTAL RETURN GRAPH]
 

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------
                                          DEC-93    DEC-94    DEC-95    DEC-96    DEC-97    DEC-98
- --------------------------------------------------------------------------------------------------
<S>                                       <C>       <C>       <C>       <C>       <C>       <C>
  Potash Corporation of Saskatchewan
    Inc. - NYSE Listing                    $100      $136      $289      $352      $348      $271
- --------------------------------------------------------------------------------------------------
  Self-selected Peer Group                 $100      $103      $167      $168      $137      $ 99
- --------------------------------------------------------------------------------------------------
  S&P 500(R)                               $100      $101      $139      $171      $229      $294
- --------------------------------------------------------------------------------------------------
The Self-selected Peer Group consists of:
 
COMPANY                                         SYMBOL
- -------                                         ------
<S>                                             <C>
Agrium Inc.* (beg. 6/30/93)                      AGU
IMC Global Inc.                                  IGL
Mississippi Chemical Corp. (beg. 9/30/94)        GRO
Phosphate Resource Partners LP**                 PLP
Terra Industries Inc.                            TRA
</TABLE>
 
*   Toronto Stock Exchange listing.
**  formerly Freeport McMoran Resource Partners LP.
 
                                       20
<PAGE>   22
 
                           COMPENSATION OF DIRECTORS
 
     Each director who is not also an officer or employee of the Corporation (an
"outside director") receives from the Corporation an annual retainer of $25,000,
a per diem fee of $1,000 for meetings he or she attends and a travel fee of $500
per day where travel is required on a day or days on which a meeting does not
occur. Outside directors receive an additional $2,500 per year, if a chairman of
a Board committee. Each outside director who is a member of a Board committee
receives a per diem fee of $1,000 for meetings he or she attends, provided such
meetings are not held the same day as a Board meeting. Outside directors are
also reimbursed for expenses incurred in discharging their responsibilities.
 
     On November 5, 1998, the Board granted options with limited transferability
(pursuant to the Stock Option Plan -- Directors) to purchase 3,000 Shares to
each of the 13 outside directors of the Corporation. Such options have an
exercise price equal to the fair market value of the Shares at the time the
options were granted (Cdn$102.35 per Share for non-U.S. resident directors and
$67.875 for U.S. resident directors, respectively), become exercisable over two
years (or earlier in the event of a "change in control" of the Corporation as
defined in the Stock Option Plan -- Directors) and expire ten years after the
date on which they were granted.
 
                              CORPORATE GOVERNANCE
 
     This statement of corporate governance is made pursuant to the requirements
of The Toronto Stock Exchange and the Montreal Exchange relating to disclosure
of corporate governance practices. Reference is also made to the Guidelines for
Improved Corporate Governance in Canada (the "Guidelines") contained in the
December 1994 report of The Toronto Stock Exchange Committee on Corporate
Governance in Canada.
 
MANDATE OF THE BOARD
 
     The Board has the duty to direct the management of the business and affairs
of the Corporation pursuant to the powers vested in it by The Business
Corporations Act (Saskatchewan) and by the articles and bylaws of the
Corporation, and in accordance with obligations imposed by law.
 
     In furtherance of the discharge of such duties and obligations, the Board
holds six regularly scheduled meetings annually and additional meetings to
consider particular issues as required. In 1998 the Board held 7 meetings.
 
     The Board, either directly or through its committees, is called upon to:
 
     (i)   approve the Corporation's annual operating and capital budgets, all
           material acquisitions and divestitures and the scope of its business
           activities;
 
     (ii)  ensure that appropriate systems are in place to manage the
           Corporation's principal business risks, including financial,
           environmental, and regulatory risks;
 
     (iii) monitor and approve succession planning and appointment and
           remuneration of senior management;
 
     (iv)  monitor and assess the integrity of the Corporation's internal
           controls and management information systems; and
 
     (v)   establish and monitor a corporate disclosure policy.
 
BOARD COMPOSITION
 
     As of February 28, 1999 fifteen directors comprised the Board. Of that
number thirteen were non-management or outside directors (a director that is not
an officer or employee of the Corporation) and twelve were unrelated directors
(a director free from any relationship with the Corporation which could
materially interfere with the director's ability to act with a view to the best
interests of the Corporation, other than arising
 
                                       21
<PAGE>   23
 
from shareholding). In determining whether directors were related or unrelated
the Board applied the test set forth in the Guidelines.
 
     As of February 28, 1999 the Corporation did not have a significant
shareholder as defined in the Guidelines.
 
     The Board has considered its size and has concluded that it functions
effectively in discharging its obligations both through Board and committee
meetings.
 
INDEPENDENT BOARD ACTION
 
     At present the Chairman of the Board is also the Chief Executive Officer of
the Corporation.
 
     The Board, with thirteen outside directors, twelve of whom are unrelated
directors, can and does function independently of management. There are four
committees of the Board, each of which plays a significant role in the discharge
of the Board's duties and obligations. Each committee is composed wholly of
outside directors, except the Executive Committee which is chaired by the Chief
Executive Officer. Each Committee may, if and when considered appropriate by it
to do so, retain the services of outside advisers. The Board has implemented a
procedure for the Executive Committee to authorize a director to engage an
outside adviser at the Corporation's expense in appropriate circumstances. In
addition, the Board has met, and may meet in the future, without management
present, as circumstances require.
 
COMMITTEES
 
Executive Committee
 
     The Executive Committee is composed of five directors, one of whom is, in
accordance with the bylaws of the Corporation, the Chief Executive Officer. Of
the other four committee members, all are outside directors and three are
unrelated directors. Between meetings of the Board the Executive Committee has,
with certain exceptions, all the powers vested in the Board. In addition, the
Executive Committee makes recommendations regarding candidates for directorship
of the Corporation. It has responsibility for corporate governance issues.
 
Audit Committee
 
     The Audit Committee is composed of three unrelated directors. The committee
meets with the Corporation's financial management personnel, internal auditor
and external auditor at least once each quarter to review the Corporation's
financial reporting practices and procedures and authorize the release of
unaudited quarterly financial statements, and reviews the Corporation's annual
financial statements prior to their submission to the Board for approval. The
committee also recommends to the Board the external auditors to be proposed to
the shareholders for appointment at the annual meeting of shareholders.
 
Compensation Committee
 
     The Compensation Committee is composed of four unrelated directors. This
committee formulates and makes recommendations to the Board in respect of
compensation issues relating to directors and senior management of the
Corporation and in respect of corporate salary and benefits policy. It reviews
and approves, on an annual basis, the Corporation's salary administration
program. It is responsible for the annual report on executive compensation. The
committee, in consultation with the Chief Executive Officer, considers and
reports to the Board regarding corporate succession matters.
 
Environmental Affairs Committee
 
     The Environmental Affairs Committee is composed of three unrelated
directors. The committee works to ensure that the Corporation's commitment to
the protection of the environment is fulfilled. It routinely receives
environmental audit reports for review and discussion with senior management and
monitors environmental issues in other areas of corporate activity such as
off-site transportation, distribution and storage
 
                                       22
<PAGE>   24
 
of product. The committee reviews and discusses with management potential
changes to regulatory requirements and to corporate environmental policy.
 
DECISIONS REQUIRING BOARD APPROVAL
 
     The Board is responsible for all decisions relating to the Corporation
which, by law, cannot be delegated to Board committees or management.
 
     The Board reviews and approves, among other things, the Corporation's
annual budget, unbudgeted capital expenditures which exceed one million dollars
(Cdn), debt and equity financing, changes to capital structure, lease
commitments with a net present value in excess of $5 million, material
acquisitions and divestitures, appointment and remuneration of the Chief
Executive Officer, directors to be proposed for election at the Corporation's
annual meeting, and any other matter which is of material significance to the
Corporation.
 
DIRECTOR RECRUITMENT AND BOARD EFFECTIVENESS
 
     The Executive Committee acts as the nominating committee of the Board. When
vacancies occur, the chairman of the committee (who is, at present, the Chief
Executive Officer) discusses with and seeks advice from committee members
regarding potential candidates or other appropriate courses of action. Upon the
Executive Committee reaching a consensus, Board approval is sought. The
Corporation's nominating process recognizes the importance of input from the
Chief Executive Officer regarding nominations, while leaving the ultimate
decision to the Board acting on the advice of the Executive Committee.
 
     The Board has not established any formal measures for assessing Board,
committee and individual director effectiveness.
 
SHAREHOLDER COMMUNICATION
 
     The Corporation has adopted a corporate disclosure policy which calls for
the timely public dissemination of material information. Shareholder questions,
comments and concerns may be made to the Corporation's Senior Vice President,
Corporate Relations, who is responsible for implementing the disclosure policy,
to the Corporate Secretary, or to the Corporation's transfer agent.
 
BOARD'S EXPECTATIONS OF MANAGEMENT
 
     Management of the Corporation is expected to perform the following
functions:
 
     (i)   provide timely accurate reports to the Board on the business and
           affairs of the Corporation and on matters of material significance to
           the Corporation;
 
     (ii)  conduct an annual budgeting process and monitor the Corporation's
           performance as compared to the annual budget approved by the Board;
 
     (iii) make such decisions and take, on a timely basis, such actions as are
           necessary for the Corporation to discharge its obligations and meet
           applicable requirements, while seeking to enhance shareholder value;
           and
 
     (iv)  review on an ongoing basis the Corporation's strategies and their
           implementation in all key areas of the Corporation's activities.
 
                            APPOINTMENT OF AUDITORS
 
     Proxies solicited hereby will be voted to reappoint the firm of Deloitte &
Touche LLP, the present auditors, as auditors of the Corporation to hold office
until the next annual meeting of shareholders, unless the shareholder signing
such proxy specifies otherwise. The affirmative vote of a majority of Shares
voted on such matter is required to reappoint the firm of Deloitte & Touche LLP,
as auditors of the Corporation. A representative of Deloitte & Touche LLP is
expected to attend the Meeting. At that time the representative
                                       23
<PAGE>   25
 
will have the opportunity to make a statement if he or she desires and will be
available to respond to appropriate questions.
 
                            MANNER OF VOTING PROXIES
 
     PROXIES SOLICITED HEREBY WILL BE VOTED OR WITHHELD FROM VOTING ON THE
ELECTION OF DIRECTORS AND VOTED FOR OR AGAINST OR WITHHELD FROM VOTING ON THE
APPOINTMENT OF AUDITORS, IN ACCORDANCE WITH ANY SPECIFICATIONS MADE ON THE
PROXY. IN THE ABSENCE OF ANY SUCH SPECIFICATION, SUCH PROXIES WILL BE VOTED FOR
THE ELECTION OF THE DIRECTORS AND THE APPOINTMENT OF THE AUDITORS SPECIFIED IN
THIS PROXY CIRCULAR.
 
     The Board knows of no matters to come before the Meeting other than the
matters referred to in the Notice of Annual Meeting. However, if any other
matters which are not now known to the Board should properly come before the
Meeting or any adjournment thereof, or if amendments or variations to the
matters referred to in the Notice of Annual Meeting are presented for action at
the Meeting or any adjournment thereof, the proxies will be voted on such
matters, amendments or variations in accordance with the best judgement of the
person voting the proxy which confers such discretionary authority.
 
                             SHAREHOLDER PROPOSALS
 
     Proposals of shareholders intended to be presented at the Corporation's
annual meeting of shareholders in 2000 and which such shareholders are entitled
to request be included in the management proxy circular for that meeting must be
received at the Corporation's principal executive offices not later than
February 7, 2000 under The Business Corporations Act (Saskatchewan) and not
later than November 24, 1999 under Rule 14a-8(a)(3)(i) promulgated under the
U.S. Securities Exchange Act of 1934.
 
                                    GENERAL
 
     In respect of matters to be voted on at the Meeting, where a broker may not
be permitted to vote Shares held in street name in the absence of instructions
from the beneficial owner of the Shares, such Shares will be considered not
entitled to vote, although such Shares and Shares for which the holders abstain
from voting will count for purposes of determining the presence of a quorum.
 
     Copies of the Corporation's most recent Form 10-K together with any
document incorporated by reference therein, the most recent annual financial
statements together with the accompanying report of the auditor, and any interim
financial statements filed subsequent to the filing of the most recent annual
financial statements may be obtained on request from the Secretary of the
Corporation.
 
     The contents and the sending of this management proxy circular have been
approved by the Board.

                                          /s/ JOHN L.M. HAMPTON
                                          JOHN L.M. HAMPTON
                                          Secretary
                                          March 26, 1999
 
                                       24
<PAGE>   26
 
                       POTASH CORPORATION
                      OF SASKATCHEWAN INC.   LOGO
<PAGE>   27
 
PROXY                                    POTASH CORPORATION OF SASKATCHEWAN INC.
- --------------------------------------------------------------------------------
FOR USE AT THE ANNUAL MEETING OF
SHAREHOLDERS TO BE HELD ON MAY 6, 1999.
THIS PROXY IS SOLICITED ON BEHALF OF THE
BOARD OF DIRECTORS OF THE CORPORATION.
 
The undersigned holder of common shares
("Shares") of Potash Corporation of
Saskatchewan Inc. (the "Corporation")
hereby appoints Charles E. Childers,
Chairman and Chief Executive Officer, or
failing him, Barry E. Humphreys, Senior
Vice President, Finance and Treasurer, or
failing him, John L.M. Hampton, Senior
Vice President, General Counsel and
Secretary, or instead of any of the
foregoing,
- ------------------------------------------ ,
as proxy for the undersigned to attend,
vote and act for and on behalf of the
undersigned AT THE ANNUAL MEETING OF
SHAREHOLDERS OF THE CORPORATION TO BE HELD
AT THE RAMADA HOTEL, 1ST AVENUE AND 22ND
STREET, SASKATOON, SASKATCHEWAN, CANADA ON
THURSDAY, THE 6TH DAY OF MAY, 1999 (THE
"MEETING") AT 10:30 A.M., and at any
adjournments thereof, and hereby revokes
any proxy previously given by the
undersigned.
1. A SHAREHOLDER HAS THE RIGHT TO APPOINT
A PERSON WHO NEED NOT BE A SHAREHOLDER, TO
REPRESENT HIM AND TO ATTEND AND ACT ON HIS
BEHALF AT THE MEETING, OTHER THAN THE
NOMINEES DESIGNATED ABOVE, AND MAY
EXERCISE SUCH RIGHT BY INSERTING THE NAME
OF HIS NOMINEE IN THE SPACE PROVIDED ABOVE
FOR THAT PURPOSE.
- -------------------------------------------
- -------------------------------------------
 
- -------------------------------------------
- -------------------------------------------
 
2. The Shares represented by this proxy
will be voted in accordance with any
choice specified in this proxy. IF NO
SPECIFICATION IS MADE, THE PERSONS NAMED
ABOVE WILL VOTE SUCH SHARES FOR THE
ELECTION OF THE DIRECTORS NAMED IN THIS
PROXY AND FOR THE APPOINTMENT OF DELOITTE
& TOUCHE LLP AS AUDITORS OF THE
CORPORATION.
 
3. If this proxy is not dated, it shall be
deemed to be dated on the date on which
 
this proxy was mailed by the Corporation.
 
Without limiting the general powers hereby conferred, the Shares represented by
                                      this proxy are to be:
 
1. [ ] VOTED FOR the election as directors of all nominees listed below (except
       as marked to the contrary below), or
 
  [ ] WITHHELD FROM VOTING for all nominees listed below.
 
INSTRUCTIONS: To withhold authority to vote for any individual nominee, strike a
                                      line through the nominee's name in the
                                      list below.
<TABLE>
 <S>            <C>            <C>                <C>
 I. Anderson    W.J. Doyle     P.J. Schoenhals    B.A. Wigmore
 D.J. Bourne    W.Z. Estey     D.K. Seaman        P.S. Wise
 C.E. Childers  D. Howe        E.R. Stromberg     T.J. Wright
 D.J. Cote      D.E. Phillips  J.G. Vicq
 
</TABLE>
 
2. Voted FOR [ ], or AGAINST [ ], or WITHHELD FROM VOTING [ ] on, the
   appointment of Deloitte & Touche LLP as auditors of the Corporation.
 
                                      Dated the  __________  day
                                      of  _____________________________  , 1999.
 
                                      ------------------------------------------
 
                                      Name of Shareholder (please print)
 
                                      ------------------------------------------
 
                                      Signature of Shareholder
 
                                                 POTASH CORPORATION
 
                                               OF SASKATCHEWAN INC.
 
                                                                            LOGO


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