Drovers Cattle Network (September 14, 2011) | U.S. corn futures are expected to open lower Wednesday on harvest pressure and questions about demand. Chicago Board of Trade futures are called 3 cents to 5 cents lower. In overnight trade, corn for September delivery was down 2 3/4 cents to $7.06 1/2 per bushel while December corn, the most active contract, was down 4 1/2 cents to $7.18 1/2.