A number of factors prompted funds to cover more of their short wheat position. That encouraged some buying in corn as well, which was further  supported by a hefty volume of export sales from USDA's weekly report plus an announcement regarding another sale. General Comments Trading in grain and soy futures was relatively quiet and light in volume as traders contemplated the long three-day Memorial Day weekend. A number of factors prompted funds to cover more of their short wheat position. That encouraged some buying in corn as well, which was further supported by a hefty volume of export sales from USDA's weekly report plus an announcement under the daily reporting requirements of a sale of 203,200 MT of old and new crop corn to unk...