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, the urea is 5-8 kg of urea or 10-15 kg of ammonium carbonate.
2, smart application of Taiwan fertilization rapeseed stage of fertilization should be treated according to the growth of rapeseed. For the weak seedlings, the fields with poor growth potential should be reapplied early, that is, when the height is about 50 cm, the manure will be applied 15-20 times, and 5 kg of urea or 45% of compound fertilizer will be added 10-15 kg. The field is strong, the leaves are dark green, and the Taiwanese fertilizer should be delayed or applied less.
3, foliar sprayed boron rapeseed is very sensitive to boron, and the need for large amounts, the lack of boron in the soil often lead to rapeseed flowers. Rape "flowers and unreal" imagination is a physiological disease caused by boron deficiency. The application of boron fertilizer has a good yield increasing 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.
Formulated fertilization technique after rapeseed in spring
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.
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