INFLUENCE OF CULTIVATION TIMING ON WEED-CONTROL IN SOYBEAN (GLYCINE-MAX) WITH AC-263,222

Cultivation timings and postemergence applications of AC 263,222 were evaluated for sicklepod and pitted morningglory control in soybean. Cu ltivation alone controlled each less than 35% season-long. A cultivati on made 7 d after POST applications of AC 263,222 more consistently im proved sicklepod and pitted morningglory control than a cultivation ma de 3 d before, immediately after, or 3 d after the POST application. I mazaquin PRE followed by 18 g ai/ha AC 263,222 controlled sicklepod 88 % or more and pitted morningglory 83% or more two of three years. A cu ltivation made immediately after AC 263,222 POST resulted in reduced s oybean yields in several instances compared to the same treatment with out cultivation. A cultivation made 7 d after application of AC 263,22 2 increased soybean yields the most in several instances compared to a ll other timings.