soybean rows adjacent to corn windbreaks did not do as well as the rest of the windbreak-sheltered soybeans because of shading effects and root competi- tion from the corn. East-west planted windbreaks, which were more nearly perpendicular to the prevailing winds, were more effective than those oriented in a north-south direction. Windbreak spacings between six times and fifteen times the windbreak height have been effective, and it is possiblethat positive results could be obtained with windbreak spacings greater than fifteen times the height. Radke and Burrows (1970) admit that the causes for increased soybean plant response have not been definitely established but suggest air turbulence effects on micrometeorological elements were responsible, includ-