薄膜覆盖育秧,过去主要采用揭膜后施用杀草丹、禾大壮的方法来防除稗草。由于揭膜施药时稗草叶龄大,除草效果不理想,仍有不少残留稗草带入大田,影响水稻产量。为此我们从1987年开始探索薄膜育秧前期化学除稗技术,现将初步的研究结果报告如下。一、试验设计试验分播前、播后盖膜前、揭膜后3次施药。采用播前、播后盖膜前施药,可以克服苗后揭膜化除时稗草叶龄大,防效较差的缺点,而且施药可以结合秧田做畦面、落谷等工作进 Film covered seedlings, in the past mainly used after the film to kill herbicide Dan, Wo strong method to control barnyardgrass. As the opening film spraying barnyard grass leaf age, weeding effect is not satisfactory, there are still many residual barnyard grass into the field, affecting rice yield. To this end, we started in 1987 to explore the film thinning seedlings of barnyardgrain technology, the preliminary findings are reported below. First, the experimental design before the test broadcast, sowing before the film, the film after spraying 3 times. The use of pre-sowing, post-sowing film before the application of pesticides, you can overcome the post-emergence of barnyard grass Jiemiao leaf age, poor control of the shortcomings, and the application of seedlings can be combined with rice noodles, fall Valley and other work into