GENERAL COMMENTS:September corn closed down 11 1/2 cents and December corn was down 10 3/4 cents. August soybeans closed down 38 1/2 cents and November soybeans were down 31 cents. September KC wheat closed down 16 cents, September Chicago wheat was down 14 1/4 cents and September Minneapolis wheat was down 15 1/4 cents.The U.S.