Using herbicides for weed management is a popular strategy for Iowa row crop producers. Over 95% of row crop acres receive a herbicide application. Cultivation, a mechanical weed management strategy, also remains popular. A 1989 survey indicated that 85% of com and soybean acres were cultivated at least once. Although cultivated acreage may have decreased recently from this level due to cultural practices (e.g. drilled soybeans), many Iowa producers use cultivation as a part of their overall management strategy.