Cropping systems on highly erodible soils in Northern Missouri have shifted from wheat in the rotation to a corn-soybean rotation.  Double-crop soybean production is risky for farmers in due to dry summers and early frost.  Research evaluated the impact of coated soybean on wheat and soybean grain yields compared to non-coated soybean cultivars in 2003 and 2004.  Wheat interference with soybean has reduced relay-intercropped soybean grain yield in some instances.  Timing for a harvest aid was evaluated to reduce the impact of wheat interference on soybean grain yield.  Glyphosate at 840 g ae ha^-1 was applied as a harvest aid to wheat one, two, and three weeks prior to harvest.  Wheat grain yield was not affected by the harvest aid treatment applied one to two weeks prior to harvest while relay-intercropped soybean grain yield increased 270 to 810 kg ha^-1 in two of the three site years when glyphosate was applied one to two weeks prior to wheat harvest when compared to non-treated, relay-intercropped soybean.  Early harvest aid applications three weeks prior to wheat harvest reduced wheat grain yield in one of the three site years.