75%环嗪酮水分散粒剂防除森林防火道杂草的效果

Control Effect of Hexazinone 75% WG on Weeds in Forest Fireproof Belt

用75%环嗪酮水分散粒剂防除森林防火道杂草,株防效和鲜重防效随着药剂浓度的提高而提高。75%环嗪酮水分散粒剂1 800 g a.i./hm2对森林防火道杂草15 d和30 d的总株防效分别为94.86%和96.46%,优于同浓度的50%草甘膦可溶性粉剂。75%环嗪酮水分散粒剂防除森林防火道杂草宜选择在杂草生长旺盛期,兑水定向喷雾,推荐用量为2 025～2 250 g a.i./hm2。

Experiments using hexazinone 75%WG to control weeds in the forest fireproof belt were carried out.The results showed that stem control effect and fresh weight control effect were increased as the herbicide dosage increasing.Meanwhile,the control effects of hexazinone 75% WG on all weeds were 94.86% and 96.46% after treatment for 15 days and 30 days respectively,which was better than that of glyphosate 50% SP under the same dosage of 1 800 g a.i./hm2.The herbicide should be sprayed directionally by adding water in the growing period of weeds with a recommended dosage of 2 025~2 250 g a.i./hm2.