COMPARISON OF HERBICIDE PROGRAMS AND CULTIVATION FOR SICKLEPOD (CASSIA-OBTUSIFOLIA) CONTROL IN SOYBEAN (GLYCINE-MAX)

Sicklepod control mid-season in cultivated soybean was higher when ima zaquin plus AC 263,222 or AC 263,222 alone was applied POST following pendimethalin plus imazaquin PPI compared with only the PPI treatment. Pendimethalin plus imazaquin PPI followed by imazaquin plus AC 263,22 2 at 36 + 18 g ai/ha or followed by AC 263,222 at 18 g ai/ha with cult ivation controlled sicklepod equal to pendimethalin PPI followed by im azaquin plus AC 263,222 at 71 + 18 g ai/ha or followed by a sequential application of AC 263,222 at 13 g ai/ha early POST followed by 9 g ai /ha late POST. Control with these treatments was no higher than for th e standard of pendimethalin plus metribuzin PPI followed by chlorimuro n POST at 9 g ai/ha, which controlled 86% sicklepod. Averaged across h erbicide treatments, cultivation reduced percent sicklepod seed in har vested soybean samples 33% and increased soybean yield 19% compared wi th no cultivation. Soybean yield was highest for the chlorimuron stand ard and greater than that for the other treatments when averaged acros s cultivation treatments.