U.S. corn futures gained, after earlier falls, as investors covered short position. Corn bounced from three-week lows. The U.S. Department of Agriculture expected to show smaller U.S. winter wheat seedings, in the agency’s first forecast for 2018. Soybean futures were narrowly lower at the Chicago Board of Trade amid analyst expectations that the USDA would boost U.S. soy ending stocks and estimates for Brazilian soy output.