(Potash item updated for analyst commentary and Potash stock-price movement.)NEW YORK ( TheStreet) -- Investors bid up shares of Potash Corp. of Saskatchewan ( POT) Friday, after the company shocked the market by hiking its profit outlook for the first quarter. Potash, which had spent the better part of 2009 issuing profit warnings and tamping down expectations as prices for its core product cratered, appeared to validate feelings among agricultural watchers that demand from farmers for potash fertilizer has started to recover in earnest. "It's a huge positive. It just tells you that the
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