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Early application of spring fertilizer: early spring topdressing can remedy the shortage of rapeseed in winter, promote multi-branched, early bud. Especially for rapeseed with insufficient base fertilizer and no fertilization, it is the key to capture high yield in early spring. Generally, the fertilizer is applied with 15-20 kg of ammonium bicarbonate or 6-7 kg of urea. 
Qiao Shifei: The rapeseed bud period is the key period for the rapeseed spring to take the shelf. At this time, the amount of fertilizer needs to be large, accounting for about half of the total. For the lack of base fertilizer and wax fertilizer, the seedlings are weak, and the fields with poor growth should be applied early, that is, when the height is 3-5 cm, the manure is 750-1000 kg, and the urea is 4-5 kg. Or 20 kg of ammonium bicarbonate is applied to the water; for the field with strong seedlings, the manure is delayed and lightly applied, generally when the height is more than 12 cm, the manure is 150-200 kg and the ammonium carbonate is 3-4. The kg is poured with water; for the "autumn and winter" type of rapeseed, less or no nitrogen fertilizer should be applied. 
Increased application of potassium fertilizer: Potassium fertilizer can be applied in the spring to enhance the resistance to lodging, disease, cold and water. Especially for potassium-deficient soils, sandy fields, and hybrid rice fields, the application of potassium fertilizer in spring can significantly increase the yield. Potash fertilizer applied to rapeseed is generally carried out from late February to early March, and the planting is carried out with 150-200 kg of plant ash or 15 kg of potassium chloride.
Replenishing flower fertilizer: Appropriate amount of applied fertilizer, can make rapeseed more strong, increase grain and gain weight. The flower fertilizer is generally sprayed on the foliar surface. When the height is 50-60 cm, the weather is selected in the sunny afternoon and no wind. For the poor growth, 300 g of urea mixed spray can be added to the prepared potassium dihydrogen phosphate solution. 
Foliar spray of boron: Boron deficiency can cause the phenomenon of "flowers and not real" in rapeseed. The application of boron can play a preventive role, which is especially important for hybrid rapeseed and high quality rapeseed. After the rapeseed is applied in the spring, it is usually sprayed once in the flood season and the initial flowering stage. Each time the borax is 50-100 grams, it is first dissolved in hot water, and then sprayed with 50-60 kilograms of water.
After the spring, the rapeseed enters the stage of growth and needs to absorb a large amount of nutrients. Therefore, scientific fertilization should be carried out according to the soil quality, climate and fertilization before spring, combined with the seedling condition. 
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