The Efficacy of Nicosulfuron·Fluroxypyr 12% OF against Annual Weeds in Corn Field

Field experiment of nicosulfuron·fluroxypyr 12% OF was conducted during 3-5 leaf stage of summer maize. the results showed that there were some spots appeared on the maize leaves 3 days after spraying, which recovered on the 7th day. it was safe to summer maize with the application dosage in this trial. With the dosages of 180, 216, 270, 432 g a.i./ha, the control effects on weeds (such as setaria viridis l, Digitaria sanguianlis l., Acalypha australis l., Abutilon theophrasti medic., cyperus difformis l.) of nicosulfuron?fluroxypyr 12% OF were 74.3, 79.1, 81.2, 87.4% respectively. According to the different dosages of nicosulfuron?fluroxypyr 12% OF 180, 216, 270, 432 g a.i./ha, on the 30th day after spraying treatment the weeds control effects on quantity were 91.2, 92.8, 94.1, 97.4% and on fresh weight were 91.3, 92.1, 96.3, 98.8%, respectively. It had good prevention and elimination effect on annual weeds in corn field at the recommended dosage.