strong>POTASH CORP. OF SASKATCHEWAN $41 (www.potashcorp .com) has raised its quarterly dividend by 50%, to $0.21 U.S. a share from $0.14 U.S. a share. The new annual rate of $0.84 U.S. yields 2.0%. Rising demand for better food in fast-growing countries like China and India should continue to push up fertilizer prices, and give the company more cash for dividends. Buy.