At the market close, December corn was down 2¼¢ at $4.21¾ per bushel. As of 3:30 p.m. CT, the S&P 500 Index was up 26.80 points, and the Dow Jones Industrial Average increased 97.06 points. Published: 3:36 a.m. CTSharp Decline in Grains: 9:30 a.m. CTJust before 9:30 a.m. CT, December corn was down 5¢ at $4.19 per bushel. "Corn, soybeans, and wheat have all started out the new week under pressure, although corn is trying to firm up." As of 9:26 a.m. CT, the S&P 500 Index was down 2.04 points, and the Dow Jones Industrial Average fell 75.60 points.