Soybeans are gaining after Argentina didn't get rains that had been forecast over the weekend as the crop nears its harvest.

March soybeans rose 45.75 cents to $14.7025 a bushel as markets reopened after the Presidents Day holiday Monday, a gain of 3.2 percent. Soybeans are rebounding after slumping for the past two weeks on forecasts for a strong harvest in South America.

In other trading, wheat and corn both fell on forecasts that winter storms would bring snow to the Plains region, giving soil there much needed moisture and boosting the outlook for this year's crops.

Metals trading was mixed.

Copper fell 2.3 percent to $3.6495 a pound. Gold and silver also fell, while platinum and palladium rose.