After the spring, rapeseed enters the vigorous period of vegetative growth and reproductive growth. It needs to absorb a large amount of nutrients. Therefore, scientific fertilization should be carried out according to soil quality, climate and fertilization before spring, combined with seedlings.
1, early application of spring fertilizer early spring topdressing can remedy the lack of winter growth of rapeseed, promote multi-branches, early bud. Especially for rapeseed with insufficient base fertilizer and no fertilization, it is the key to capture high yield in early spring. Generally, 5-8 kg of urea or 10-15 kg of ammonium carbonate is used.
2, the fertilization of skillfully fertilized rape should be treated according to the growth of rapeseed. For the weak seedlings, the fields with poor growth potential should be applied early, that is, when the height is about 50 cm, the manure will be 15-20 tons of manure, plus 5 kg of urea or 4-15 kg of compound fertilizer, which will grow. Wang, the leaves are dark green, and the fertilizer should be delayed or applied less.
3. Foliar sprayed boron rape is very sensitive to boron, and it needs a large amount. Insufficient supply of boron in the soil often leads to rape and flower. Rape "flowers and unreal" imagination is a physiological disease caused by boron deficiency. The application of boron fertilizer has a good yield increase effect. After the spring rapeseed, the boron is sprayed once, usually in the initial flowering period, 50-100 grams of borax per acre, first dissolved in hot water, and then sprayed 50-60 kilograms of water; the second spraying of boron can combine with Sclerotinia sclerotiorum The prevention and control of the rape is carried out together.
4. Increasing the application of potassium fertilizer in order to improve the resistance of rapeseed to lodging, disease resistance and waterlogging, the application of potassium fertilizer has obvious effects, especially in the potassium-deficient soil such as sandy soil and paddy field, the application of potassium fertilizer can increase the yield, time From late February to mid-March, it can be applied with grass ash, about 150 kg per mu or 15 kg of potassium chloride.
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