The growth characteristics of cotton are unlimited growth, strong regeneration ability, strong controllability of the plant shape, and large amount of fertilizer. In general, sufficient fertilizer is the basis for high yield and quality of cotton. Adequate phosphate fertilizer can promote robust growth of cotton plants, increase boll weight, and early maturation. Potassium fertilizer is a catalyst for various enzymes in plants and can promote photosynthesis and cellulose synthesis. The fertilization technology of cotton is: "regulate nitrogen, increase potassium, make up phosphorus, spray boron". Specifically, we should grasp the following five technical measures:
First, pay attention to the application of farmyard manure: farmyard manure can improve the soil, fertility and fertility. The supply of various nutrients for crops, combined with the application of a certain amount of chemical fertilizers, is a supplement and an increase in efficiency for farmyard manure. On this basis, the application of trace fertilizer will have a significant synergistic effect. If farmyard fertilizers or fertilizers are not satisfied, the effects of trace fertilizers are not significant.
Second, adjust the ratio of nitrogen fertilizer: farmers long-term partial application of nitrogen fertilizer, the results not only cause nitrogen nutrient loss and waste, but also make the proportion of nitrogen, phosphorus, potassium serious imbalance. According to different soil fertility, the application of nitrogen fertilizer per acre to 10 to 15 kg (including organic fertilizer nitrogen).
Third, increase the amount of potassium fertilizer: cotton absorption from the bud emergence to the bud takes up about 24% of the total growth period. It takes about 42% to blossom. About 34% of flowering matures. Therefore, potassium fertilizer should be applied before or after budding, so as to facilitate the early growth of cotton and focus on the needs of the growth and development of buds, flowers and bells. In the later period, potassium fertilizer can also be sprayed on the leaves (Kaifeng potassium or P and K power) to supplement potassium. The amount of potassium fertilizer increased to 10-15 kg per mu.
4. Supplemental Phosphatic Fertilizers: Phosphorus is not easy to move in the soil, and the dissolution and release are slow, and it is not easy to be absorbed by the root system. Therefore, the phosphate fertilizer can be used as a base fertilizer to make it have a fertilizer effect in the early stage of fertility. In production, nitrogen fertilizers are often used in combination with phosphate fertilizers, and their fertilizer efficiency is much higher than that of phosphate fertilizers. Can also be top-dressed in late roots, with high-quality potassium dihydrogen phosphate (such as Singapore imported 99% phosphorus and potassium power) and other foliar spray. Phosphate should be added to 20 to 30 kg.
5. Spraying boron fertilizer: Sufficient boron can not only promote flower development, but also facilitate pollination and increase seed-setting rate. It can also accelerate the transport of carbohydrates in plants and increase the weight of single peach and the percentage of lint, so it should be in the bud stage. The first flowering stage and full flowering stage each spray a 1000 times Sifeng boron solution.
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