晚稻秧田化学除草,一般选择播种前、播后芽前和秧苗五叶期用药。从实际情况看,播种前用药虽然比较安全,但是缩短了除草剂杀草的有效期,播后芽前用药时间太短不好掌握,五叶期用药为时已晚。根据我们的实践摸索,初步认为将播前和播种后芽前用药延至播后芽期(即播种到第一片叶展开)撒毒土,将五叶期用药提前到四叶期茎叶喷雾,防除效果较好。 Late rice seedling chemical weeding, the general choice before sowing, sowing buds and five-leaf seedling medication. From the actual situation, although the drug before sowing more secure, but shortened the effective period of herbicide to kill grass, sowing time before budding medication is too short to master, five-leaf period of medication is too late. According to our practice, it is preliminarily thought that the pre-emergence and post-sowing pre-emergent treatment will be postponed to the post-sowing bud stage (that is, sown to the first leaf) to spread the poisonous soil, and the five- Control effect is better.