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After the beginning of spring, rape will enter the "double-wang" period of vegetative growth and reproductive growth. During this period, rape needs large amounts of fertilizer, and there are many diseases and insect pests. It is particularly important to grasp field management. First, re-application of moss fertilizer 1, late February to mid-March, when the rapeseed is about 6-10 cm high, to re-apply moss fertilizer, apply ammonium sulfate 12-15 kg per mu or urea 6-8 kg. For rapeseeds that do not produce in the winter, have late growth, or have severe frost damage and poor seedlings, they should be applied early and in batches. 2. The application of flower fertilization has an important role in improving the rate of scarring, reducing the incidence of puberty, preventing premature senescence, and increasing grain weight. It can apply 3-6 kilograms of urea in the early flowering period. The growing rapeseed can be sprayed with 0.2% potassium dihydrogen phosphate solution and 0.5-1 kg urea per acre for foliar fertilizer. 2. Boron-boron deficiency is the main reason why rapeseed is not flowered. It can be used to supplement boron fertilizer by spraying 0.3-0.6% borax solution during the flowering period of rapeseed. The dosage per acre is 150-250 grams. III. Prevention of pests and weeds 1. Drainage of gutters: After the spring, the weather is rainy, and it is necessary to timely clear the ditch, deepen the ditch, lower the groundwater level, and reduce the humidity in the field, so as to promote the growth of rapeseed roots and prevent premature decline of rape. 2. Removal of old leaves: In the early flowering period, the yellow leaves and diseased leaves of the stem base of rapeseed can be removed 2-3 times, and these leaves can be taken out of the field and buried deep or burned. 3, control pests: Sclerotinia can be used 25% Bacteria 1500-2000 times the liquid or 50% isoprenil urea 1000 times to control; downy mildew can be used 72% cream Kang 800 times or 72.2% of promecarb 600- 1000 times liquid for prevention and treatment; when two diseases occur at the same time, can be used to control 500-600 times Sclerotium light. The aphids can be controlled with 16.5% pertussis 1500-2000 times liquid. Plutella xylostella can be controlled by 5% Astragalus sp. 3000-4000. 4. Control of weed damage: For transplanting or rowing rapeseed, weeds can be removed by cultivating soil. Weeds breed severe fields and use chemical herbicides. In the field of grassy weeds, weeds can be sprayed with 30-50 ml per acre or 15% spermatophyte at a rate of 30-50 ml per acre with 5% konjac weeds; mainly weeds with dicotyledonous weeds. In the plots, weeds can be sprayed with 50% of high tex, 30-40 ml/mu, or 30% wet and 50 ml per acre. Single and dicotyledon weeds can be mixed with the above two types of pesticides to spray weeds.