Depending on what kind of grass you want to weed, herbicides for killing monocotyledonous weeds (Gramineae) in rape fields can be divided into four categories according to their components: 1, quizalofop-ethyl, such as quizalofop-ethyl, quizalofop-ethyl, Qichu, Ai Jing, Jinbangke, etc. 2. Pesticide essence: such as precise and stable killing, stable killing, etc. ; 3, diflubenzuron: such as high-efficiency cover grass energy, cover grass energy, etc. ; 4. Jingkou oxazole essence: such as Wei Ba and Hummer. 2. Herbicides for killing dicotyledonous weeds (broadleaf weeds) in rape fields (only used in cabbage rape fields) are mainly herbicides, such as Gothic, Costco, Herbicide, Youcaomai, etc. 3. Herbicides used for monocotyledonous and dicotyledonous weeds in rape fields are mainly the mixture of herbicide benazolin and quizalofop-p-ethyl, such as block knife, double herbicide, double herbicide, golden cover and weeding. This herbicide is only used in Brassica napus fields, and mustard rape varieties are prone to phytotoxicity. Description: 1. The above three herbicides can be used by farmers according to the occurrence of weeds in their rape fields. 2. The application period, application amount and application method per mu can be carried out according to the description of pesticide label. 3. The weeding effect depends not only on the quality of the product itself, but also on the soil moisture in the rape field. When the soil moisture in the field is above 70%, the weeding effect is good; Otherwise, if the soil is dry, the weeding effect will be relatively reduced.