Published: Oct 12, 2012 3:24 PM EDT
Updated: Oct 13, 2012 6:31 AM EDT

The price of wheat is dropping as weekend storms are expected to deliver much-needed moisture to fields in parts of the country.

Wheat for December delivery fell 3.3 percent to finish Friday at $8.5675 per bushel. Corn and soybean prices also dropped.

The weekend rains are expected to help winter wheat crops that have been plagued by dry weather in western Kansas, Nebraska and Colorado. At least 15 percent of the U.S. winter wheat crop is grown in that region.

Separately, wheat prices were pressured by a new report showing a 9 percent drop in export sales last week.

Other commodities are falling because of concerns about global economic growth. Prices are lower for gold, industrial metals, oil and wholesale gasoline. Natural gas and cotton are higher.