CBOT wheat futures hit a one-week high with technical buying and short-covering turning the market higher after prices sagged to session lows. Hard red winter wheat and MGEX spring wheat contracts also closed in positive territory after trading on both sides of unchanged. USDA said the U.S. 2018 winter wheat crop 75 percent planted, up from 60 percent a week earlier but behind the five-year average of 80 percent.