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First, apply Spring Fertilizer early. Early spring fertilizers can remedy the shortage of winter rapeseed growth and promote more branches and early buds. Especially in the case of rapeseed which has insufficient basal fertilizer and no wax fertilizer, applying topdressing fertilizer in early spring is the key to seizing high yields. General Mushi ammonium bicarbonate 5-20 kg or urea 6-7 kg against the use of clear water.
Second, skillfully applied fertilizer. Rapeseed during the thunderbolt period is a critical period for rape spring crops. At this time, the amount of fertilizer required is relatively large, accounting for about half of the total amount. For basal fertilizer, wax fertilizer shortage, weak seedlings, poor growth should be applied early, that is, when the height of 3-5 cm, Mu Shi human urine 750-1000 kg, plus urea 4-5 kg ​​or carbon Ammonium 20 kilograms watering; apply vigorously to the seedlings and apply it lightly. Usually when the height is more than 12 cm, the manure 150-200 kilograms of ammonium and ammonium bicarbonate 3-4 kilograms will be poured into the water; Double-wing rapeseed in autumn and winter, at this time should control the amount of nitrogen fertilizer, less or not applied.
Third, spraying boron on the leaves. The "flowering but not realizing" phenomenon of rape is a physiological disease caused by boron deficiency. Application of boron fertilizer can play a preventive and control role, which is more important for hybrid rapeseed and high quality rapeseed. Boron is generally sprayed once in the flood season and early flowering period. Each mus of 50-100 grams of borax is dissolved in hot water and sprayed with 50-60 kg of fresh water.
Fourth, pay fertilizer. Fertilizers are generally sprayed on the leaves. When the beak is 50-60 cm in height, the spray is applied when there is no wind in the sunny afternoon. For the difference in growth potential, 300 g of urea can be added to the prepared potassium dihydrogen phosphate solution.
Fifth, increase potassium fertilizer. Rape potash fertilizer in spring can increase resistance to lodging, disease resistance, cold resistance and stain resistance. Especially for potassium-deficient soils, sandy fields, and hybrid rice fields, the application of potash fertilizer in the spring can receive a significant increase in yield. Potassium fertilizer is generally added in mid-March, and 150-200 kilograms of plant ash are planted in mu, or 15 kg of potassium chloride is applied.
Current rape fertilization measures
Current rapeseed growth has entered a period of vegetative growth and reproductive growth, which requires a lot of nutrient supply. Therefore, according to the local soil, climate and pre-fertilization, combined with the situation of the seedlings, do a good job of the current rapeseed fertilization quality, seize the high yield of rapeseed.