油菜田杂草种类多、数量大,杂草和油菜争水、肥、光和生存空间,导致油菜形成弱苗、瘦苗、高脚苗、油菜抽薹后,分枝数、结荚数、单荚粒数明显减少,千粒重降低,造成减产、油菜分芥菜型、白菜型和甘蓝型三种,由于遗传基因不同,对各种农药的敏感程度也不一样 油菜田化学除草的方法是,前期用药杀草,后期以密控草 一、油菜田杂草种类 冬油菜田:分布在长江、黄河流域的四川、贵州、湖南、湖北、浙江、江苏、河南、山东等省,油菜面积近500万公顷,占全国播种面积的90％,主要杂草有:看 Rape weed species and large number of weeds and rapeseed water, fertilizer, light and living space, resulting in the formation of weak rapeseed rapeseed, thin seedlings, tall seedlings, rapeseed after the number of branches, pod number, single The number of pods reduced significantly, and the grain weight decreased, resulting in reduced production. There are three types of rapeseed: Brassica juncea, Brassica campestris and Brassica oleracea. Due to the different genetic factors, the sensitivity to various pesticides is also different. Grass to kill the grass, late to a controlled grass a rape field weed species Winter rape fields: distributed in the Yangtze River, the Yellow River in Sichuan, Guizhou, Hunan, Hubei, Zhejiang, Jiangsu, Henan, Shandong and other provinces, rapeseed area of ​​nearly 5000000 hectares , Accounting for 90% of the country sown area, the main weeds are: look