2. Early application of spring fertilizer should be combined with irrigation. Don't fertilize where there is no irrigation condition. It depends on the seedlings after snowfall and rainfall. Large seedlings and flourishing seedlings can be applied less or not, while small seedlings and weak seedlings should be applied more. Spraying a new high-fat film on the surface of seedlings can prevent the infection of germs, improve the ability to resist natural disasters, improve the intensity of photosynthesis and protect the vigorous growth of seedlings. Under normal circumstances, 5-7.5 kilograms of urea can be applied per mu, which can be applied by ditching or combined with sprinkler irrigation before irrigation.
3, intertillage weeding, especially in Weibei dry plateau area, must be deeply cultivated to improve soil moisture, so that rape can use deep water to alleviate drought.
4. Pest control in spring. The main pests of rape are aphids and vegetable stem weevils. It is best to use 10% imidacloprid EC 1500 times solution or 3% acetamiprid wettable powder 3000 times solution plus new high-fat film to control aphids. Use 1.5% dimethoate powder or 1% methyl parathion powder to control vegetable stem weevil, and use1.5-2kg twice per mu at intervals of 5-7 days to achieve the best control effect. You can also use powder once, with an interval of 5-7 days, and then spray 40% omethoate 1000 times solution or 50% phoxim EC 1000 times solution plus new high-fat film for prevention and control.