PotashCorp Announces Private-Agreement Purchase of Common Shares Under Current Share Repurchase Program

    Listed: TSX, NYSE
    Symbol: POT

    SASKATOON, SK, Sept. 5 /CNW/ - Potash Corporation of Saskatchewan Inc.
(PotashCorp) announced that it today purchased for cancellation 500,000 of its
common shares outstanding pursuant to private agreement between the company
and an arm's-length third-party seller. This purchase brings the cumulative
total number of shares purchased under PotashCorp's 15.82 million share
repurchase program announced in January 2008 to 15.15 million shares.
    This transaction was made pursuant to an issuer bid exemption order
issued by the Ontario Securities Commission (the "Order"), and the disclosure
in this news release is required by the Order.
    The Order permits PotashCorp to purchase up to an additional 600,000
common shares by way of one or more similar private agreements with one or
more arm's-length third party sellers specified in the Order, prior to
November 30, 2008.

    Potash Corporation of Saskatchewan Inc. is the world's largest fertilizer
enterprise producing the three primary plant nutrients and a leading supplier
to three distinct market categories: agriculture, with the largest capacity in
the world in potash, second largest in nitrogen and third largest in
phosphate; animal nutrition, with the world's largest capacity in phosphate
feed ingredients; and industrial chemicals, as the largest global producer of
industrial nitrogen products and the world's largest capacity for production
of purified industrial phosphoric acid.

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For further information: Investors, Denita Stann, Director, Investor
Relations, Phone: (847) 849-4277, Email: ir@potashcorp.com; Media, Bill
Johnson, Director, Public Relations, Phone: (306) 933-8849, Email:
pr@potashcorp.com; Web Site: www.potashcorp.com