The absorption rate of N, P and K is different at different growth stages of winter wheat, and the rules of absorbing fertilizer are: before the returning green period of wheat, the growth of plants is slow, the absorption rate of N, P and K is low, and the aboveground part grows quickly after returning green, and the absorption rate of N, P and K is the highest. Absorption rate gradually decreased after flowering.
According to the requirement fertilizer regulation of winter wheat 1:0.4:2, combined with the crop yield and soil nutrient supply conditions, in general, low-yielding fields should be formulated with a large amount of chemical fertilizers, and the amount of chemical fertilizers in high-yielding fields can be reduced appropriately. some. 50% of nitrogen fertilizer should be used as basal fertilizer, and the other 50% should be divided into one or two times. They should be applied in the returning green period and the jointing to flowering period.
Most of Huaibei area is fluvo-aquic soil and cinnamon soil. The soil clay is rich in hydrous mica and other secondary minerals containing potassium. The soil contains about 20% potassium, slow-acting potassium 900-1000ppm, and quick-acting potassium 120-250ppm. In terms of wheat production levels, potassium is not lacking. However, with the increase in yield, excessive application of nitrogen and phosphorus fertilizers cause nutrient imbalance, it is necessary to use potassium fertilizer to regulate the balance of nutrients. Application of nitrogen and phosphorus fertilizer is necessary for wheat, but the increase of potassium fertilizer can make the plant robust, thick culm, more tillers, more ears, full grain, reduce lodging, and improve disease resistance.
Therefore, the use of special formula fertilizer and appropriate compound fertilizer not only reduces the investment, but also enables the winter wheat to achieve high yield, high quality and high efficiency without wasting manpower and material resources.
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