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1, Shi Shichun Shi. Early spring fertilizer can make up for lack of growth in winter, prompting multiple branches, root system, thick neck, strong seedlings. In particular, the shortage of basal fertilizer and the failure to apply wax fertilizer to rapeseeds is the key to seizing high yields in early spring. Therefore, to apply early, apply before and after the beginning of spring, with mainly available nitrogen fertilizer, ammonium bicarbonate can be applied 15-20 kg per mu, or 6-7 kg of urea. For winter overgrown fields, spring fertilizers can be applied without or with little application, and the fertilization time can be appropriately delayed. For spring-grown and thin fields, the amount of nitrogen fertilizer should be increased to promote the rapid transformation of rapeseed.
2, stable application of fertilizer. Rape bud stage is a critical period for spring hair, requiring a large amount of fertilizer, accounting for about half of the total. Fertilizer is a key top dressing to promote rapeseeds and grow stronger. For the weak and poorly growing plots, early replanting is required. When the loquat height is 5 cm, 500~750 kilograms of human excrement will be used per mu and 4~5 kg of urea will be added to the water. In a robust and normal growing plot, when the lofty height is 7~10 cm, 500 kilograms of human fecal urine is used, plus 10 kg of ammonium bicarbonate to pour the water; the plots with more prosperous seedlings can grow 15 centimeters in height. When the above, Mu Shi human excrement 250 ~ 500 kg. For "double-autumn" rapeseed, at this time, the amount of nitrogen fertilizer should be controlled, with little or no application.
3, increase potassium fertilizer. Raising K fertilizer in spring can increase resistance to lodging, cold 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. Generally, from the end of February to the beginning of March, 5 to 7 kg of potassium chloride will be used. After the leaves are dry, the water will be poured. You can also apply 150-200 kg of ash per acre.
4, spray boron fertilizer. The phenomenon of "flowering but not realizing" of rape is a physiological disease caused by boron deficiency. The application of boron fertilizer can play a preventive and control role, especially for hybrid rape and high quality rapeseed. Boron after spring rape is generally sprayed in the flood season and the first flowering period. Each time, 50 to 100 grams of borax is used per acre. After being dissolved in hot water, 50 kg of fresh water is sprayed.
5, make up the application of fertilizer. Rapeseed is an infinitely inflorescence crop, with flowering edges and corners. Applying fertilizer can make rape more flowering, more knots, and increased grain weight. Foliar spray is generally applied on the leaves. Before flowering or early flowering, 150-200 g of monobasic potassium phosphate and 50 kg of water are used to spray water on sunny days without wind. For poor growth, add 300 grams of urea mixed spray to the prepared potassium dihydrogen phosphate solution.
6, clever application of fertilizer. Granule fertilizer is a top-dressing fertilizer before and after the final flowering period of rapeseed. It has the effect of increasing the photosynthetic intensity of keratinocytes and increasing the number of grains and grain weight. But this time near the mature period, if it is improperly applied, it will cause late-maturing lust. The general foliar application of potassium dihydrogen phosphate solution 2 to 3 times (the preparation method with the same fertilizer), can effectively increase the oil content of the grain weight.
Rape Spring Fertilization
After the beginning of spring, rape enters the vigorous period of vegetative growth and reproductive growth, and it needs to absorb large amounts of nutrients in order to achieve the purpose of long-term spring production, high yield, and high yield. Therefore, scientific fertilization is crucial, and we must master the "early, steady, increase, spray, fill, and skillful" six-character.