After the spring rape enters a vigorous period of vegetative growth and reproductive growth, it needs to absorb a large amount of nutrients, so at this time should be based on soil quality, climate and fertilization before spring, combined with the conditions of the seedlings for scientific fertilization.
Apply spring fertilizer early. Early spring fertilizer can remedy the shortage of winter rapeseed growth, promote more branches and early buds. In particular, the shortage of basal fertilizer and the failure to apply wax fertilizer to rapeseeds are the key to seizing high yields in the early spring. Generally 5-7 kg of urea or 10-15 kg of ammonium bicarbonate.
Clever application of moss. Rape fertilization in rapeseed should be treated according to the appearance of rape. For the weak seedlings, the poorly growing plots should be re-applied early, that is, when the height is about 50 centimeters, the mushi excrement is 15-20 terra, plus 5 kg urea or 45% compound fertilizer 10-15 kg, on the growth Wang, dark green leaves, moss fertilizer to delay the application or less.
Increase potassium fertilizer. In order to improve rape lodging resistance, disease resistance and anti-staining ability, the application of potash fertilizer has obvious effects. In particular, the application of potash fertilizer to potassium-deficient soils such as sandy fields and paddy fields has received significant yield increase effect. The time is from late February to 3 In the middle of the month, it can be used to spread vegetation ash, about 150 kg per mu or 15 kg of potassium chloride.
Foliar spraying boron. Rape is very sensitive to boron, and it requires a large amount of soil. The lack of boron in the soil often causes rape to fail. Rape "flower but not real" imagination is a physiological disease caused by boron deficiency, the application of boron fertilizer has a good effect of increasing production. Boron after spring rape, generally sprayed once in the initial flowering period, 50-100 grams of borax per mu, dissolved first with hot water, and then sprayed 50-60 kg of fresh water; the second boron spray can be combined with rape sclerotiorum The prevention and control are carried out together to increase the yield of rapeseed.
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