Rapeseed's demand for nutrients

Nitrogen, the seedling stage accounts for 43.9% of the total growth period, bolting to the initial flowering stage accounts for 45.8% of the total growth period, and the flowering stage to the mature stage accounts for 10.3%;

Phosphorus element, the seedling stage accounts for 20.0% of the total growth period, the bolting to the initial flowering period accounts for 21.7%, and the flowering stage to the mature stage accounts for 58.3%;

Potassium element, the seedling stage accounts for 24.2% of the whole growth period, bolting to the first flowering stage accounts for 54.1%, and the flowering stage to the mature stage accounts for 21.7%.

Rape planting scientific fertilization technology

The fertilization strategy of rapeseed is to promote and stabilize later, that is, 70% nitrogen fertilizer, all phosphate fertilizer, potassium fertilizer and boron fertilizer are used as base fertilizer or seedling fertilizer, and the remaining 30% nitrogen fertilizer is applied in mossy fertilizer.

Topdressing of rapeseed is just as important as base fertilizer, which requires attention to balanced fertilization. In order to grow strong seedlings, apply 3-5 kg of urea in the rape field under 5 leaves to promote the growth of rape seedlings. In addition, pay attention to supplementary application of boron, phosphorus and potassium fertilizers, supplementing with 1-1.5 kg of boron fertilizer for fields without boron fertilizer, supplementing with 5-8 kg of potassium chloride for fields with no phosphorus and potassium fertilizer or supplementing with phosphate fertilizer 20- 25 kg, or 10-15 kg of ternary compound fertilizer.

When the rape buds are differentiated, the top fertilizer should be chased. At this time, the top-effect nitrogen fertilizer is mainly used, and the urea can be applied 5-7 kg per mu; the period should be 5-8 kg urea per mu, and 2.5-5 kg diammonium phosphate, or Apply ternary compound fertilizer 15-20 kg;

During the flowering stage of rapeseed, topdressing can be sprayed with leaves. During the flowering and pod setting period, 50 kg of 0.1% -0.2% urea or 0.2% potassium dihydrogen phosphate solution should be sprayed per mu, and boron fertilizer should be sprayed 1-2 times before flowering. Of course, the amount of top dressing in different fields should be adjusted according to the seedlings.

If the target output is more than 200 kg / mu, the total amount of chemical fertilizer (per pure) per mu is: 13-15 kg of nitrogen fertilizer, 4-6 kg of phosphate fertilizer, 7-9 kg of potassium fertilizer, and 1.0 kg of borax.

Special fertilizer for rape

30-5-5 / 28-6-6, 25-10-5, 25-10-16, (high tower process) 18-6-6, 15-6-9, 15-15-15 (drum process )