Wheat for March delivery dropped 3.25 cents to $5.355 a bushel, while March corn shed 3 cents to $3.6325 a bushel. March oats slid 6 cents to $1.845 a bushel, and March soybeans tumbled 13 cents to $9.555 a bushel.
Beef and pork futures also slid on the Chicago Mercantile Exchange.
April live cattle traded down 0.50 cent to 87 cents a pound, and March feeder cattle shed 0.68 cent to 94.47 cents a pound. April lean hogs slipped 0.05 cent to 63.75 cents a pound, while March pork bellies lost 0.92 cent to 79.05 cents a pound.