常用茎叶处理剂对直播稻田杂草的防除效果初探

Effects of Common Postemergence Herbicides on Weeding in Direct Sowing Rice Field

为探讨杂草常用茎叶处理剂在直播水稻田中的安全性及对杂草的防除效果,进行了直播水稻田杂草的田间药效试验。结果表明,⑴稻杰和农美利一样,对直播水稻田稗草、鸭舌草、陌上菜、异型莎草等杂草具有较好的防除效果;⑵千金对直播水稻田千金子高效,对稗草的防除效果较好;⑶沙稗丰对直播水稻田稗草高效,对鸭舌草、陌上菜和异型莎草有一定的防除效果;⑷优丹对直播水稻田鸭舌草、陌上菜和异型莎草的防除效果较好;⑸这5种供试药剂均对直播水稻安全。建议直播水稻田防除杂草时,在水稻播后3叶期以上,杂草2～4叶期,茎叶喷雾处理。

This efficacy trial was conducted to study safety and weed control effects of frequently-used postemergence herbicides in direct sowing paddy. The results show that（1） both Penoxsulam and Nominee performed good control effect on weeds in direct sowing rice field,such as barnyard grass, Monochoria vaginalis, Lindernia procumbens, Cyperus difformis, etc.;（2） Cyhalofop-butyl provided better control effect on Chinese sprangletop and good control effect on barnyard grass;（3） Quinclorac could effectively control barnyard grass and had a certain control effect on Monochoria vaginalis, Lindernia procumbens and Cyperus difformis;（4） Bentazone had good control effect on Monochoria vaginalis, Lindernia procumbens and Cyperus difformis; and（5） the 5 tested herbicides were all safe to direct sowing rice. It is suggested that the optimal weed control in direct sowing rice field could be practised at the 3-leaf stage or later of rice and the 2～4-leaf stage of weeds with herbicide spray on weed stems and leaves.