When fertile cultivation is most suitable for fertilization

When is rapeseed planting the most suitable when fertilizing? The maximum efficiency period of rapeseed fertilization is during flowering. The demand for nitrogen fertilizer in rapeseed is higher than that of potassium fertilizer, although the demand for potassium fertilizer is more than that of phosphate fertilizer. For rapeseed, the base fertilizer accounts for 60% of the total fertilization. Topdressing only accounts for 40% of the total fertilization. The nitrogen requirement of rapeseed seedlings accounted for 43.9% of the total growth period, the demand for phosphorus accounted for 20.0%, and the demand for potassium accounted for 24.2%. From the bolting to the initial flowering stage, nitrogen needs 45.8% of the total growth period; phosphorus needs 21.7%; and potassium needs 54.1%. From the flowering stage to the maturity stage, the demand accounted for 10.3; the demand for phosphorus accounted for 58.3%; and the demand for potassium accounted for 21.7%. According to this law, accurate topdressing can meet the demand and reduce waste.

Chasing after the early, timely in place. Rapeseed is very sensitive to phosphorus. Phosphorus deficiency in rapeseed has a great influence on the nutrition, growth and yield of rape in the middle and late stages of rape. Even in the middle and late stages, phosphorus supplementation can not compensate for the loss of phosphorus during seedling stage. Since phosphorus can be repeatedly used in rapeseed, the earlier the fertilization, the earlier the absorption and the greater the efficiency. Phosphorus application can promote the early maturity of rapeseed for 2-3 days, and increase the oil content by 0.5%-2.4%. Therefore, rapeseed must be applied with sufficient phosphate fertilizer before the 5 leaves of the seedlings. The moss flowering period is the maximum efficiency period of rapeseed nutrition, and the fertilizer content accounts for the largest proportion in the whole life. Therefore, it is necessary to apply fertilizer in time for bolting to flowering, so that it can be used for buds.

Balance fertilization. Apply enough. For the rapeseed autumn and winter, before the 5 true leaf stage, 5Kg of urea seedlings should be applied per acre, and the phosphate fertilizer should be applied 20kg-25kg. In order to improve the fertilizer efficiency, nitrogen and phosphorus should be mixed and ditched. Free withdrawal will result in loss of fertilizer. When rapeseed flower buds are differentiated, the main effect is to use quick-acting nitrogen fertilizer, and about 700 kg of manure and urine of 5 to 7 kg per mu. During the moss flowering period, 7.5kg-10kg of urea is applied per mu, and 2.5k8-5kg of ammonium dihydrogen phosphate or 15kg-20kg of ternary compound fertilizer is applied. In order to prevent premature aging, the urea should be applied 3kg-5kg later, and the boron fertilizer should be sprayed once or 2 times. The amount of topdressing in different fields should be mastered by seedlings. In order to accelerate the conversion of nutrients, each time after topdressing, you can also spray Huimanfeng active liquid fertilizer at a concentration of 1:500 times.

This article URL: When is the best time to fertilize rapeseed planting

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