TORONTO (Bloomberg) - Canadian stocks advanced to a four-week high after BlackBerry maker Research In Motion Ltd.'s (RIM) better-than-expected forecast buttressed speculation corporate profits will grow even though the economy is slowing.

Potash Corp. of Saskatchewan Inc. rose to a record on predictions that fertiliser prices will soar. Bombardier Inc. climbed to the highest this year after reporting earnings that exceeded estimates.

Car-parts maker Magna International Inc. and clothing retailer Reitmans Canada Inc. led consumer-related companies lower on signs shoppers are curtailing spending.

"We knew RIM's results would be good," said Gareth Watson, associate director at ScotiaMcLeod's portfolio advisory group, which oversees about $65 billion in Toronto.

"The reaction in the market is more to the guidance. It shows the bottom line can thrive despite what has happened" in the economy.

The Standard & Poor's/TSX Composite Index rose 0.3 percent to 13,551.29 in Toronto, gaining for the ninth time in 10 days.

Research In Motion added 4.9 percent to C$123.42, the second-highest close ever in Toronto Stock Exchange trading.

That increased the company's market value to C$69.4 billion, making Research In Motion the nation's biggest.

First-quarter sales will double to as much as $2.3 billion, the company predicted, signaling sales may withstand the US economic slump and competition from Apple Inc.

The forecast beat the $2.01 billion average of estimates compiled by Bloomberg. Profit will climb to as much as 86 cents a share, topping analysts' 75-cent projection.

Potash Corp., the world's biggest maker of crop nutrients, rose 3.4 percent to C$168.67.

The stock has more than doubled in a year amid surging demand for grains and oilseeds, making Potash the S&P/TSX's fifth-largest company with a market value of C$53.2 billion.