Bloomberg: Wheat rose for the second time in three sessions on signs that a prolonged drought in the southern Great Plains is damaging winter crops in the U.S., the world’s largest exporter of the grain. About 45 percent of Kansas wheat was in good or excellent condition as of March 8, down from 50 percent a week earlier, the U.S. Department of Agriculture said yesterday. About 21 percent of the Oklahoma crop earned top ratings, down from 23 percent, and the Texas evaluation was unchanged at 10 …