Corn rose for the first time in three days after U.S. government data showed the planting rate in the Midwest lagged behind the five-year average as rain and cold weather left some fields too wet for farm machinery.About 5 percent of the crop was planted in the 18 states that produce most U.S. corn as of April 19, compared with an average of 14 percent planted from 2004 to 2008, the U.S. Department of Agriculture report said yesterday....MORE