By Leia Michele Toovey- Exclusive to Potash Investing NewsMonday was a tough day on the market, as resurrecting concerns over China's demand combined with worries over Portugal's solvency to send commodities down across the board. On Tuesday, a relief rally followed, however, potash stocks' failed to jump on board. Mosaic Company (NYSE: MOS) shares ended the trading session lower by $3.65 or, 7.91 percent from its previous close. Mosaic's stock is hitting support at $37.68, and resistance at $46.49. CF Industries Holdings, Inc. (NYSE: CF) is down 1.5 percent at $73.11, with only about 2.1 million shares exchanging hands. Potash Corp. of Saskatchewan, Inc. (NYSE: POT) shares are down 0.4% at $92.61, and are also suffering from light volume. The fact that Potash Corp's shares have been battered has resurrected rumors that BHP (NYSE: BHP) would make a bid for the potash giant. These rumours surfaced a few months ago, but were squashed when Potash Corp CEO Bill Doyle admitted that if anyone were to purchase Potash Corp, it would be “expensive.” As Potash shares fail to gain forward momentum, the company potentially becomes a more affordable takeover target. Relative to the other potash producers, Scotia Capital has confidence in Agrium. On Tuesday, Scotia Capital upgraded Agrium (NYSE: AGU) to sector outperformer from sector performer. The stock closed Friday at $58.17 on volume of 3,030,200 shares, above average daily volume of 1,837,186. Agrium is currently above its 50-day moving average of $54.25 and should find resistance at its 200-day moving average of $58.98. It will take a change in the fundamentals of the potash market before producers will see an increase in share value. After a strong start to 2010, fertilizer consumption fizzled in the second quarter. In a report on the sector, analysts at CIBC world markets commented that the market is oversupplied, putting prices under pressure. Producers have tried, and failed, to push through price increases. And the supply-demand situation could get worse, as about 21 million tonnes of brownfield production capacity is expected to come on stream in the next five years. “Without a step-up in potash demand in 2011 to 55-60 million tonnes, the potash market appears to be oversupplied for the foreseeable future,” the analysts added.