 Overall yield performance across the board. The Oklahoma Wheat Commission, working hard for Oklahoma wheat producers. Kansas City wheat, September down 23.25, 575.75. December down 22.25, 593.75. Chicago wheat, September down 21.5, 569. December is down 20.75 at 592.75. September corn is down 16.5, 394. December is down 15.75 at 408.25.