Abstract: A field experiment was conducted to determine the efficacy of fluoroglycofen-ethyl 10%EC against broadleaf weeds in the soybean field. The results showed that the control efficacy was 91.49%~99.87% at 40 days after post-emergence treatment with fluoroglycofen-ethyl 10%EC at the application rate of 300~1 200 mL/hm² in the soybean field,and 95.65%~99.94% （based on weed plant fresh weight） at 40 days after treatment. Fluoroglycofen-ethyl 10%EC had relatively good effect to broadleaf weeds in soybean fields and when it was applied during 3~5 leaf stage,the chemical worked well in controlling the weeds of Amaranthus spinosus L. and Portulaca oleracea L., the suitable dosage was 600~900 mL/hm².

Key words: fluoroglycofen-ethyl 10%EC, soybean, broadleaf weeds, control efficacy