Exhibit 4(b)

AMENDING AGREEMENT

(Syndicated Term Credit Facility)


THIS AGREEMENT is made as of September 23,
2003

BETWEEN:



| |                                                               
| | --------------------------------------------------------------
| | POTASH CORPORATION OF SASKATCHEWAN
    INC.,                  
| | a corporation subsisting under the laws of Canada             
| | (hereinafter referred to as the
    Borrower),              
|
| | OF THE FIRST PART,                                            
|
| | -and -                                                        
|
| | THE FINANCIAL INSTITUTIONS SET FORTH ON
    SCHEDULE A        
| | HERETO AND ON THE SIGNATURE PAGES                             
| | HEREOF UNDER THE HEADING
    LENDERS:                       
| | (hereinafter referred to collectively as the
    Lenders and
| | individually as a Lender),                                  
|
| | OF THE SECOND PART,                                           
|
| | -and -                                                        
|
| | THE BANK OF NOVA SCOTIA,                                      
| | a Canadian chartered bank, as agent of the Lenders            
| | (hereinafter referred to as the
    Agent),                 
|
| | OF THE THIRD PART.                                            

WHEREAS the parties hereto have agreed to amend
and supplement certain provisions of the Credit Agreement as
hereinafter set forth;

NOW THEREFORE THIS AGREEMENT WITNESSES that in
consideration of the covenants and agreements herein contained
and other good and valuable consideration, the receipt and
sufficiency of which are hereby conclusively acknowledged by
each of the parties hereto, the parties hereto covenant and
agree as follows:

1.   Interpretation

1.1. In this Agreement and the recitals
hereto, unless something in the subject matter or context is
inconsistent therewith:

Agreementmeans this agreement, as amended, modified, supplemented or
restated from time to time.

Credit
Agreementmeans the term credit
agreement made as of September 25, 2001 between Borrower,
the Lenders listed in Schedule A thereto and such other
financial institutions as become party thereto as lenders, and
the Agent.

1.2. Capitalized terms used herein without
express definition shall have the same meanings herein as are
ascribed thereto in the Credit Agreement.

1.3. The division of this Agreement into
Sections and the insertion of headings are for convenience of
reference only and shall not affect the construction or
interpretation of this Agreement. The terms this
Agreement, hereof, hereunder and
similar expressions refer to this Agreement and not to any
particular Section or other portion hereof and include any
agreements supplemental hereto.





---



##### 



1.4. This Agreement shall be governed by and
construed in accordance with the laws of the Province of Ontario
and the federal laws of Canada applicable therein.

2.   Amendments and
Supplements

2.1. Amendments to Applicable Margin.Section 1.01 of the Credit Agreement is hereby
amended by deleting the existing definition of Applicable
Margin in its entirety and substituting the following
therefor:



| |                                                                                                                                                                                   
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | Applicable
    Marginmeans, at any time, the
    applicable rate per annum set forth in the table below for the
    applicable S & P rating and the applicable Utilization Rate:

|                        |  |                  |  |                  |  |                
|----------------------- |  | ---------------- |  | ---------------- |  | ---------------
|                       
|                       
|S & Ps Corporate       |  |                 
|Credit or Unsecured     |  | Utilization Rate
|Debt Rating of          |  |                 
|Borrower                |  | < 1/3            |  | 3 1/3 and<  2/3  |  | 3 2/3          
|                       
|                       
|A- or above             |  | 0.50% per annum  |  | 0.575% per annum |  | 0.65% per annum
|                       
|BBB+                    |  | 0.65% per annum  |  | 0.725% per annum |  | 0.80% per annum
|                       
|BBB                     |  | 0.85% per annum  |  | 0.925% per annum |  | 1.00% per annum
|                       
|BBB-                    |  | 1.10% per annum  |  | 1.175% per annum |  | 1.25% per annum
|                       
|BB+ or below or unrated |  | 1.60% per annum  |  | 1.675% per annum |  | 1.75% per annum
|                       

2.2. Amendments to Standby Fee Rate.Section 1.01 of the Credit Agreement is hereby
amended by deleting the existing definition of Standby Fee
Rate in its entirety and substituting the following
therefor:



| |                                                                                                                                                   
| | --------------------------------------------------------------------------------------------------------------------------------------------------
| | Standby Fee
    Ratemeans, at any time, the
    applicable rate per annum set forth in the table below opposite
    the applicable S & P rating:

|                            |  |                 
|--------------------------- |  | ----------------
|                           
|                           
|S & Ps Corporate Credit or
|Unsecured Debt Rating of   
|Borrower                    |  | Standby Fee Rate
|                           
|                           
|A- or above                 |  | 0.10% per annum 
|                           
|BBB+                        |  | 0.125% per annum
|                           
|BBB                         |  | 0.15% per annum 
|                           
|BBB-                        |  | 0.20% per annum 
|                           
|BB+ or below or unrated     |  | 0.30% per annum 
|                           

2.3. Increase of Credit
Facility. Section 2.01 of the Credit Agreement is
hereby amended to delete the amount U.S.$650,000,000
on third line thereof and to substitute therefor
U.S.$750,000,000; for certainty, the parties hereto
confirm and agree that the amount of the Credit Facility shall
be and is hereby increased from U.S.$650,000,000 to
U.S.$750,000,000.

2.4. Addition of New Lenders.



| |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (a) | Addition of New Lenders.The parties hereto confirm and
    agree that, from and after the date hereof, each of BNP Paribas
    (Canada), HSBC Bank Canada, Rabobank Nederland, Canadian Branch
    and Société Générale (Canada) (collectively,
    the New Lenders and, individually, a
    New Lender) shall be a Lender for all
    purposes of the Credit Agreement and other Loan Documents having
    the Individual Commitment set forth opposite its name on
    Schedule A hereto and all references herein or therein to
    Lenders or a Lender shall be deemed to
    include each of the New Lenders.

2



---



##### 





| |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (b) | Novation of New
    Lenders.Each of the New Lenders
    hereby agrees that it will be bound by the Credit Agreement and
    the other Loan Documents as a Lender to the extent of its
    Individual Commitment as fully as if it had been an original
    party to the Credit Agreement.                                                                                                                                                                                                                                                                                                                                                                                                                  
|
| | (c) | Notices.The
    parties hereto hereby confirm and agree that, from and after the
    date hereof, any demand, notice or communication to be given to
    a New Lender, as a Lender, in accordance with the provisions of
    the Credit Agreement shall be made or given to such New Lender
    at the address set out in Schedule A to the Credit
    Agreement, as amended hereby.                                                                                                                                                                                                                                                                                                                       
|
| | (d) | The Agent.Without in any way limiting the
    other provisions hereof, each New Lender irrevocably appoints
    and authorizes the Agent to take such action as agent on its
    behalf and to exercise such powers under the Credit Agreement
    and the other Loan Documents as are delegated to the Agent by
    the terms thereof, together with such powers as are reasonably
    incidental thereto, all in accordance with the provisions of the
    Credit Agreement.                                                                                                                                                                                                                             
|
| | (e) | Independent Credit Decision.Each New Lender acknowledges to
    the Agent that such New Lender has itself been, and will
    continue to be, solely responsible for making its own
    independent appraisal of and investigations into the financial
    condition, creditworthiness, condition, affairs, status and
    nature of the Borrower and its Subsidiaries, all of the matters
    and transactions contemplated herein and in the Credit Agreement
    and other Loan Documents and all other matters incidental to the
    Credit Agreement and the other Loan Documents. Each New Lender
    confirms with the Agent that it does not rely, and it will not
    hereafter rely, on the Agent:



| |      |                                                                                                                                                                                                                                                                                                                                                                                                         
| | ---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (i)  | to check or inquire on its behalf into the
    adequacy, accuracy or completeness of any information provided
    by the Borrower, its Subsidiaries or any other person under or
    in connection with the Credit Agreement and other Loan Documents
    or the transactions therein contemplated (whether or not such
    information has been or is hereafter distributed to it by the
    Agent); or
|
| | (ii) | to assess or keep under review on its behalf the
    financial condition, creditworthiness, condition, affairs,
    status or nature of the Borrower and its Subsidiaries.                                                                                                                                                                                                                              



| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | Each New Lender acknowledges to the Agent that a
    copy of the Credit Agreement (including a copy of the Schedules
    annexed thereto) has been made available to it for review and
    further acknowledges and agrees that it has received copies of
    such other Loan Documents and such other information that it has
    requested for the purposes of its investigation and analysis of
    all matters related to this Agreement, the Credit Agreement, the
    other Loan Documents and the transactions contemplated hereby
    and thereby. Each New Lender acknowledges to the Agent that it
    is satisfied with the form and substance of the Credit Agreement
    (as amended and supplemented hereby) and the other Loan
    Documents.

2.5. New Schedule A; Revised
Commitments.Schedule A to the Credit Agreement is
hereby deleted in its entirety and replaced with Schedule A
attached hereto, inter alia, to reflect changes in
the Individual Commitments of Lenders and the addition of the
New Lenders.

2.6. Extension of Conversion
Date. The Conversion Date is hereby extended to
September 21, 2004 pursuant to Section 1.13 of the
Credit Agreement with respect to each Lender.

2.7. Addition of Affirmative
Covenant. Section 11.01 of the Credit Agreement is
hereby amended to add the following new covenant as
Section 11.01(n):



| |      |                                                                                                                                                                                                                                                                           
| | ---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (n) | Ranking of
    Obligations.The Borrower shall at all
    times ensure that the Obligations and the obligations of the
    Guarantor under the Guarantee rank at least
    pari passu in right of payment with the most senior
    unsecured, unsubordinated Debt thereof.

3



---



##### 



3.   Representations and
Warranties

The Borrower hereby represents and warrants as
follows to each Lender and the Agent and acknowledges and
confirms that each Lender and the Agent is relying upon such
representations and warranties:



| |     |                              
| | --- | -----------------------------
| | (a) | Capacity, Power and Authority



| |      |                                                                                                                                                                                                                                                                     
| | ---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (i)  | It is duly incorporated and is validly subsisting
    under the laws of its jurisdiction of incorporation and has all
    the requisite corporate capacity, power and authority to carry
    on its business as presently conducted and to own its property;
    and
|
| | (ii) | It has the requisite corporate capacity, power
    and authority to execute and deliver this Agreement.                                                                                                                                                             



| |     |                              
| | --- | -----------------------------
| | (b) | Authorization; Enforceability



| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | It has taken or caused to be taken all necessary
    action to authorize, and has duly executed and delivered, this
    Agreement, and this Agreement is a legal, valid and binding
    obligation of it enforceable against it in accordance with its
    terms, subject to applicable bankruptcy, reorganization, winding
    up, insolvency, moratorium or other laws of general application
    affecting the enforcement of creditors rights generally
    and to the equitable and statutory powers of the courts having
    jurisdiction with respect thereto.



| |     |                                      
| | --- | -------------------------------------
| | (c) | Compliance with Other
    Instruments



| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | The execution, delivery and performance by the
    Borrower of this Agreement and the consummation of the
    transactions contemplated herein do not conflict with, result in
    any breach or violation of, or constitute a default under the
    terms, conditions or provisions of its articles, by-laws or
    other constating documents or any unanimous shareholder
    agreement relating to, the Borrower or of any law, regulation,
    judgment, decree or order binding on or applicable to the
    Borrower or to which its property is subject or of any material
    agreement, lease, licence, permit or other instrument to which
    the Borrower or any of its Subsidiaries is a party or is
    otherwise bound or by which any of them benefits or to which any
    of their property is subject and do not require the consent or
    approval of any Official Body or any other party.

The representations and warranties set out in
this Agreement shall survive the execution and delivery of this
Agreement and the making of each Accommodation, notwithstanding
any investigations or examinations which may be made by or on
behalf of the Agent, the Lenders or Lenders counsel. Such
representations and warranties shall survive until the Credit
Agreement has been terminated.

4.   Conditions
Precedent

The amendments and supplements to the Credit
Agreement contained herein shall be effective upon, and shall be
subject to, the satisfaction of the following conditions
precedent:



| |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (a) | the Borrower shall have paid to the Agent, for
    each Lender, a fee in United States dollars equal to 0.05% of
    the Individual Commitment of each Lender;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|
| | (b) | the Guarantor shall have executed and delivered
    to the Agent on behalf of the Lenders a confirmation with
    respect to its Guarantee in the form attached hereto;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|
| | (c) | the Borrower and the Guarantor shall have each
    delivered to the Agent (i) a current certificate of status
    or good standing, as the case may be, in respect of its
    respective jurisdiction of incorporation, (ii) certified
    copies (dated on or after the date hereof) of its articles,
    by-laws and other constating documents and of its resolutions
    authorizing the execution and delivery of the Loan Documents to
    which it is a party, including, without limitation, this
    Agreement or the aforementioned confirmation, as the case may
    be, and (iii) a certificate of incumbency of the officers
    of the Borrower and the Guarantor executing the same; and

4



---



##### 





| |     |                                                                                                                                                                                                                                                                                                                                                                                          
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (d) | the Agent and the Lenders shall have received
    legal opinions from internal or external counsel to each of the
    Borrower and the Guarantor respecting this Agreement, the
    confirmation of the Guarantee and the transactions contemplated
    hereby, each such opinion to be in form and substance
    satisfactory to the Agent and Lenders counsel (acting
    reasonably).

The foregoing conditions precedent are inserted
for the sole benefit of the Lenders and the Agent and may be
waived in writing by the Lenders, in whole or in part (with or
without terms and conditions).

5.   Confirmation of Credit
Agreement and other Loan Documents

The Credit Agreement and the other Loan Documents
to which the Borrower is a party and all covenants, terms and
provisions thereof, except as expressly amended and supplemented
by this Agreement, shall be and continue to be in full force and
effect and the Credit Agreement as amended and supplemented by
this Agreement and each of the other Loan Documents to which the
Borrower is a party is hereby ratified and confirmed and shall
from and after the date hereof continue in full force and effect
as herein amended and supplemented, with such amendments and
supplements being effective from and as of the date hereof upon
satisfaction of the conditions precedent set forth in
Section 4 hereof.

6.   Further
Assurances

The parties hereto shall from time to time do all
such further acts and things and execute and deliver all such
documents as are required in order to effect the full intent of
and fully perform and carry out the terms of this Agreement.

7.   Enurement

This Agreement shall enure to the benefit of and
shall be binding upon the parties hereto and their respective
successors and permitted assigns.

8.   Counterparts

This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original
and all of which taken together shall be deemed to constitute
one and the same instrument, and it shall not be necessary in
making proof of this Agreement to produce or account for more
than one such counterpart. Such executed counterparts may be
delivered by facsimile transmission and, when so delivered,
shall constitute a binding agreement of the parties hereto.

IN WITNESS WHEREOF the parties hereto have
executed this Agreement.



| |                      
| | ---------------------
| | POTASH CORPORATION OF
| | SASKATCHEWAN INC.    



| |     |                   
| | --- | ------------------
| | By: | /s/ WAYNE BROWNLEE

| |                                
| | -------------------------------
| |                                
| | Name:        Wayne
    Brownlee

| |        |                          
| | ------ | -------------------------
| | Title: | Sr. V.P., Treasurer & CFO



| |     |                     
| | --- | --------------------
| | By: | /s/ BETTY-ANN HEGGIE

| |                                  
| | ---------------------------------
| |                                  
| | Name:        Betty-Ann
    Heggie

| |        |                              
| | ------ | -----------------------------
| | Title: | Sr. V.P., Corporate Relations

5



---



##### 





| |                        
| | -----------------------
| | LENDERS:               
|
| | THE BANK OF NOVA SCOTIA



| |     |                
| | --- | ---------------
| | By: | /s/ JEFF CEBRYK

| |                             
| | ----------------------------
| |                             
| | Name:        Jeff
    Cebryk

| |        |         
| | ------ | --------
| | Title: | Director



| |    |                      
| | -- | ---------------------
| | By | /s/ ROBERT WASYLYNIUK

| |                                   
| | ----------------------------------
| |                                   
| | Name:        Robert
    Wasylyniuk

| |        |          
| | ------ | ---------
| | Title: | Associate



| |                     
| | --------------------
| | ROYAL BANK OF CANADA



| |     |                  
| | --- | -----------------
| | By: | /s/ PASCAL MUZARD

| |                               
| | ------------------------------
| |                               
| | Name:        Pascal
    Muzard

| |        |                 
| | ------ | ----------------
| | Title: | Attorney-in-fact



| |     | 
| | --- | 
| | By: | 

| |                            
| | ---------------------------
| |                            
| | Name:                      
| | Title:                     
|
| | CREDIT SUISSE FIRST BOSTON,
| | TORONTO BRANCH             



| |     |                 
| | --- | ----------------
| | By: | /s/ ALAIN DAOUST

| |                              
| | -----------------------------
| |                              
| | Name:        Alain
    Daoust

| |        |         
| | ------ | --------
| | Title: | Director



| |     |                  
| | --- | -----------------
| | By: | /s/ PETER CHAUVIN

| |                               
| | ------------------------------
| |                               
| | Name:        Peter
    Chauvin

| |        |               
| | ------ | --------------
| | Title: | Vice President

6



---



##### 





| |                                     
| | ------------------------------------
| | BANK OF AMERICA, N.A., CANADA BRANCH



| |     |               
| | --- | --------------
| | By: | /s/ NELSON LAM

| |                            
| | ---------------------------
| |                            
| | Name:        Nelson
    Lam

| |        |               
| | ------ | --------------
| | Title: | Vice President



| |     | 
| | --- | 
| | By: | 

| |                             
| | ----------------------------
| |                             
| | Name:                       
| | Title:                      
|
| | COMERICA BANK, CANADA BRANCH



| |     |                   
| | --- | ------------------
| | By: | /s/ MARC J. DROUIN

| |                                
| | -------------------------------
| |                                
| | Name:        Marc
    J. Drouin

| |        |                         
| | ------ | ------------------------
| | Title: | Assistant Vice President



| |     | 
| | --- | 
| | By: | 

| |                          
| | -------------------------
| |                          
| | Name:                    
| | Title:                   
|
| | EXPORT DEVELOPMENT CANADA



| |     |                 
| | --- | ----------------
| | By: | /s/ DAN OBLENIS

| |                              
| | -----------------------------
| |                              
| | Name:        Dan
    OBlenis

| |        |                   
| | ------ | ------------------
| | Title: | Loan Asset Manager



| |     |                 
| | --- | ----------------
| | By: | /s/ VITO DI TURI

| |                              
| | -----------------------------
| |                              
| | Name:        Vito
    Di Turi

| |        |                       
| | ------ | ----------------------
| | Title: | Loan Portfolio Manager

7



---



##### 





| |                 
| | ----------------
| | BANK OF MONTREAL



| |     |              
| | --- | -------------
| | By: | /s/ R. WRIGHT

| |                           
| | --------------------------
| |                           
| | Name:        R.
    Wright

| |        |               
| | ------ | --------------
| | Title: | Vice President



| |     | 
| | --- | 
| | By: | 

| |                                  
| | ---------------------------------
| |                                  
| | Name:                            
| | Title:                           
|
| | BANK OF TOKYO-MITSUBISHI (CANADA)



| |     |                     
| | --- | --------------------
| | By: | /s/ DAVIS J. STEWART

| |                                  
| | ---------------------------------
| |                                  
| | Name:        Davis
    J. Stewart

| |        |               
| | ------ | --------------
| | Title: | Vice President



| |     | 
| | --- | 
| | By: | 

| |                     
| | --------------------
| |                     
| | Name:               
| | Title:              
|
| | BNP PARIBAS (CANADA)



| |     |                    
| | --- | -------------------
| | By: | /s/ CHARLES RITCHIE

| |                                 
| | --------------------------------
| |                                 
| | Name:        Charles
    Ritchie

| |        |                                              
| | ------ | ---------------------------------------------
| | Title: | Vice President 
     Energy & Project Finance



| |     |                   
| | --- | ------------------
| | By: | /s/ ANDREW SCLATER

| |                                
| | -------------------------------
| |                                
| | Name:        Andrew
    Sclater

| |        |                                                  
| | ------ | -------------------------------------------------
| | Title: | Assistant Vice President, 
     Corporate Banking

8



---



##### 





| |                 
| | ----------------
| | HSBC BANK CANADA



| |     |                     
| | --- | --------------------
| | By: | /s/ NIGEL RICHARDSON

| |                                  
| | ---------------------------------
| |                                  
| | Name:        Nigel
    Richardson

| |        |                                                               
| | ------ | --------------------------------------------------------------
| | Title: | Head of Corporate & Institutional 
     Banking Western Region



| |     |                  
| | --- | -----------------
| | By: | /s/ DAVE EYOLFSON

| |                               
| | ------------------------------
| |                               
| | Name:        Dave
    Eyolfson

| |        |                           
| | ------ | --------------------------
| | Title: | Manager Commercial Banking



| |                    
| | -------------------
| | RABOBANK NEDERLAND,
| | CANADIAN BRANCH    



| |     |                      
| | --- | ---------------------
| | By: | /s/ GOVERT VERSTRALEN

| |                                   
| | ----------------------------------
| |                                   
| | Name:        Govert
    Verstralen

| |        |                                  
| | ------ | ---------------------------------
| | Title: | General Manager Principal Officer



| |     |                  
| | --- | -----------------
| | By: | /s/ ANDREW CHEWPA

| |                               
| | ------------------------------
| |                               
| | Name:        Andrew
    Chewpa

| |        |                          
| | ------ | -------------------------
| | Title: | VP  Relationship Manager



| |                              
| | -----------------------------
| | SOCIÉTÉ GÉNÉRALE
    (CANADA)



| |     |                
| | --- | ---------------
| | By: | /s/ M. SCHACTER

| |                             
| | ----------------------------
| |                             
| | Name:        M.
    Schacter

| |        |                  
| | ------ | -----------------
| | Title: | Managing Director



| |     |             
| | --- | ------------
| | By: | /s/ G. BENAY

| |                          
| | -------------------------
| |                          
| | Name:        G.
    Benay

| |        |         
| | ------ | --------
| | Title: | Director

9



---



##### 





| |                                                     
| | ----------------------------------------------------
| | AGENT:                                              
|
| | THE BANK OF NOVA
    SCOTIA,in its capacity as Agent



| |     |                
| | --- | ---------------
| | By: | /s/ JEFF CEBRYK

| |                             
| | ----------------------------
| |                             
| | Name:        Jeff
    Cebryk

| |        |         
| | ------ | --------
| | Title: | Director

10



---



##### 



Schedule A

Individual Commitments

|                                                                                                                               |  |                       |  | 
|------------------------------------------------------------------------------------------------------------------------------ |  | --------------------- |  | 
|                                                                                                                               |  |                      
|Name and Address of Lender                                                                                                     |  | Individual Commitment
|                                                                                                                               |  |                      
|The Bank of Nova Scotia                                                                                                        |  | U.S.$130,000,000     
|Corporate Banking
    Suite 2000, 700  2nd Street S.W.
    Calgary, Alberta
    T2P 2N7                                       |  |                      
|                                                                                                                              
|Attention:                                                                                                                     |  | Director              |  | 
|Facsimile:                                                                                                                     |  | (403) 221-6497        |  | 
|                                                                                                                              
|Royal Bank of Canada                                                                                                           |  | U.S.$125,000,000     
|5th Floor, South Tower
    Royal Bank Plaza
    Toronto, Ontario
    M5J 2W7                                                   |  |                      
|                                                                                                                              
|Attention:                                                                                                                     |  | Allan Fordyce         |  | 
|Facsimile:                                                                                                                     |  | (416) 842-5320        |  | 
|                                                                                                                              
|Credit Suisse First Boston, Toronto Branch                                                                                     |  | U.S.$100,000,000     
|1 First Canadian Place, Suite 3000
    P.O. Box 301
    Toronto, Ontario
    M5X 1C9                                           |  |                      
|                                                                                                                              
|Attention:                                                                                                                     |  | Alain Daoust          |  | 
|Facsimile:                                                                                                                     |  | (416) 352-4576        |  | 
|                                                                                                                              
|Bank of America, N.A., Canada Branch                                                                                           |  | U.S.$60,000,000      
|Consumer Products Group  Portfolio
    Management
    231 S. La Salle Street
    IL 231-10-06
    Chicago, Illinois
    60697 |  |                      
|                                                                                                                              
|Attention:                                                                                                                     |  | Monique Ruiz          |  | 
|Facsimile:                                                                                                                     |  | (312) 987-5614        |  | 
|                                                                                                                              
|Comerica Bank, Canada Branch                                                                                                   |  | U.S.$35,000,000      
|Suite 2210, Royal Bank Plaza, South Tower
    200 Bay Street
    P.O. Box 61
    Toronto, Ontario
    M5J 2J2                  |  |                      
|                                                                                                                              
|Attention:                                                                                                                     |  | Marc J. Drouin        |  | 
|Facsimile:                                                                                                                     |  | (416) 367-2460        |  | 
|                                                                                                                              

i



---



##### 



|                                                                                          |  |                                                                                    |  | 
|----------------------------------------------------------------------------------------- |  | ---------------------------------------------------------------------------------- |  | 
|                                                                                          |  |                                                                                   
|Name and Address of Lender                                                                |  | Individual Commitment                                                             
|                                                                                          |  |                                                                                   
|Export Development Canada                                                                 |  | U.S.$50,000,000                                                                   
|151 OConnor Street
    Ottawa, Ontario
    K1A 1K3                                       |  |                                                                                   
|                                                                                         
|Attention:                                                                                |  | Paul Hemsing                                                                       |  | 
|Facsimile:                                                                                |  | (613) 598-3167                                                                     |  | 
|                                                                                         
|Bank of Montreal                                                                          |  | U.S.$50,000,000                                                                   
|4th Floor
    1 First Canadian Place
    P.O. Box 150
    Toronto, Ontario
    M5X 1H3    |  |                                                                                   
|                                                                                         
|Attention:                                                                                |  | Robert Wright                                                                      |  | 
|Facsimile:                                                                                |  | (416) 359-7796                                                                     |  | 
|                                                                                         
|Bank of Tokyo-Mitsubishi (Canada)                                                         |  | U.S.$25,000,000                                                                   
|Vancouver Office
    950  666 Burrard Street
    Vancouver, British Columbia
    V6C 3L1 |  |                                                                                   
|                                                                                         
|Attention:                                                                                |  | Davis J. Stewart, Vice President
    Corporate Banking Group                       |  | 
|Facsimile:                                                                                |  | (604) 691-7311                                                                     |  | 
|                                                                                         
|BNP Paribas (Canada)                                                                      |  | U.S.$25,000,000                                                                   
|77 King Street West
    Suite 4100, Royal Trust Tower
    Toronto, Ontario
    M5K 1N8    |  |                                                                                   
|                                                                                         
|Attention:                                                                                |  | Charles Ritchie, Vice President                                                    |  | 
|Facsimile:                                                                                |  | (416) 947-3538                                                                     |  | 
|                                                                                         
|HSBC Bank Canada                                                                          |  | U.S.$50,000,000                                                                   
|2210, 777  8th Avenue S.W.
    Calgary, Alberta
    T2P 3R5                              |  |                                                                                   
|                                                                                         
|Attention:                                                                                |  | Nigel Richardson
    Head of Corporate & Institutional
    Banking, Western Region |  | 
|Facsimile:                                                                                |  | (403) 215-4433                                                                     |  | 

ii



---



##### 



|                                                                                                                  |  |                                                            |  | 
|----------------------------------------------------------------------------------------------------------------- |  | ---------------------------------------------------------- |  | 
|                                                                                                                  |  |                                                           
|Name and Address of Lender                                                                                        |  | Individual Commitment                                     
|                                                                                                                  |  |                                                           
|Rabobank Nederland, Canadian Branch                                                                               |  | U.S.$50,000,000                                           
|77 King Street West, Suite 4520
    Royal Trust Tower, TD Centre
    P.O. Box 57
    Toronto, Ontario
    M5K 1E7 |  |                                                           
|                                                                                                                 
|Attention:                                                                                                        |  | Andrew Chewpa, Vice President and
    Relationship Manager |  | 
|Facsimile:                                                                                                        |  | (416) 941-9750                                             |  | 
|                                                                                                                 
|Société Générale (Canada)                                                                                         |  | U.S.$50,000,000                                           
|100 Yonge Street
    Scotia Plaza, Suite 1002
    Toronto, Ontario
    M5C 2W1                                    |  |                                                           
|                                                                                                                 
|Attention:                                                                                                        |  | Marla Schacter, Managing Director                          |  | 
|Facsimile:                                                                                                        |  | (416) 364-1879                                             |  | 

iii



---



##### 



CONFIRMATION OF GUARANTEE
 TO:
    
    The Lenders
 AND TO:
    
    The Bank of Nova Scotia, as agent of the Lenders (the Agent)
         PCS NITROGEN, INC.By:Name:Title:By:Name:Title: