Exhibit 10(z)
 POTASH CORPORATION OF SASKATCHEWAN INC.
 AMENDMENT TO THE AGREEMENT
 Wayne R. Brownlee
     4.
    
    The annual supplemental retirement benefit payable under this
Agreement, if any, shall be calculated as of the date of the Executives
termination of employment (or death, if earlier) as follows:
 (a)
    
    5% of the Executives average 3
highest calendar years Earnings,
 multiplied by
 the Executives years (including partial years
calculated to the last full month completed) of
Continuous Service completed before July 1, 2009 up
to a maximum of 10 years;
 PLUS
 (b)
    
    the sum of (i), (ii) and (iii),
where:
 (i)
    
    is equal to 2% of
the Executives average 3 highest calendar
years Earnings,
 multiplied by




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the Executives years (including partial
years calculated to the last full month
completed) of Continuous Service in excess of
25 years to a maximum of 10 additional years,
to the extent that such Continuous Service
was completed before July 1, 2009;
 (ii)
    
    is equal to 2% of
the Executives average Earnings for the 3
consecutive calendar years during which the
Executives Earnings were the highest,
 multiplied by
 the Executives years (including partial
years calculated to the last full month
completed) of Continuous Service in excess of
25 years to a maximum of 10 additional years,
provided that (A) such Continuous Service was
completed on and after July 1, 2009 but
before January 1, 2011, and (B) the sum of
the years of Continuous Service taken into
account under section (b)(i) and this section
(b)(ii) does not exceed 10; and
 (iii)
    
    is equal to 1.5%
of the Executives average Earnings for the 3
consecutive calendar years during which the
Executives Earnings were the highest,
 multiplied by
 the Executives years (including partial
years calculated to the last full month
completed) of Continuous Service in excess of
25 years to a maximum of 10 additional years,
provided that (A) such Continuous Service was
completed on and after January 1, 2011, and
(B) the sum of the years of Continuous
Service taken into account under sections
(b)(i) and (b)(ii) and this section (b)(iii)
does not exceed 10;
 MINUS
 (c)
    
    the annual retirement benefit
which can be provided with the sum of (i) the balance
of the Executives account under the Pension Plan
attributable to
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employee contributions made to such plan by the
Executive as of December 31, 2010, adjusted on and
after January 1, 2011 for its allocable share of
earnings through the date of the Executives
termination of employment or death, as the case may
be, and (ii) the Executives account balance under
the Pension Plan attributable to employer
contributions made to the Pension Plan by the
Corporation and/or its subsidiaries or affiliates on
behalf of the Executive (and earnings thereon through
the date of the Executives termination of employment
or death, as the case may be).
   POTASH CORPORATION OF
SASKATCHEWAN INC.By:
    /s/ Barbara Jane IrwinWayne R. Brownlee/s/ Wayne R. Brownlee SIGNED SEALED AND DELIVEREDin the presence of:Bob KirkpatrickName of Witness/s/ Bob KirkpatrickSignature of Witness
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