1. Early application of spring fertilizer in early spring can remedy the shortage of rape growth in winter, promote multi-branching and early budding. Especially for rapeseed with insufficient base fertilizer and no wax fertilizer, topdressing fertilizer in early spring is the key to high yield. General acres use 5-8 kg of urea or 10-15 kg of ammonium carbonate.
2. The fertilization of skillfully applied rapeseed should be treated separately according to the appearance of the rapeseed. For the seedlings with weak potential and poor growth, early heavy application should be applied. That is, when the height is about 50 cm, the manure should be applied with 15-20 dung, plus 5 kg of urea or 10-15 kg of 45% compound fertilizer. For fertile, green leaves, fertilizer should be delayed or applied less.
3. Foliar spraying of rapeseed is very sensitive to boron and requires a large amount. Inadequate supply of boron in the soil often results in rapeseed flowering. Rapeseed "flowering but not realizing" is a physiological disease caused by boron deficiency. Application of boron fertilizer has a good effect of increasing yield. Rape is applied with boron after spring. Generally, it is sprayed once during the first flowering period. 50-100 g of borax is used for each acre. It is first dissolved with hot water and then sprayed with 50-60 kg of clear water. The prevention and control were carried out together, which played a role in increasing the yield of rape.
4. Increasing potassium fertilizer In order to improve the ability of rape to resist fall, disease and stain resistance, the application of potassium fertilizer has obvious effects, especially for potassium-deficient soils such as sandy and paddy fields, increasing the potassium fertilizer in spring can receive a significant increase in yield. From late February to mid-March, it can be sprayed with plant ash, about 150 kg per mu or 15 kg of potassium chloride.
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