12%烟嘧·氯氟吡油悬浮剂防除玉米田一年生杂草田间药效及安全性试验

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

验证了12%烟嘧·氯氟吡氧乙酸油悬浮剂的田间使用效果,在夏玉米苗后3～5叶期茎叶处理,施药后3d,玉米叶片上出现点状或块状黄斑,药后7d左右开始恢复,对玉米生长及结实无不良影响,对玉米安全。药后10d,12%烟嘧?氯氟吡氧乙酸油悬浮剂180、216、270、432ga.i./hm2对狗尾草、马唐、铁苋菜、苘麻、异型莎草等杂草总的株防效分别为74.3%、79.1%、81.2%、87.4%;药后30d,株防效分别为91.2%、92.8%、94.1%、97.4%,鲜重防效分别为91.3%、92.1%、96.3%、98.8%,对一年生杂草防效显著。

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.