Ratio of cotton base fertilizer

The ratio of cotton base fertilizer (nitrogen, phosphorus and potassium fertilizer) is generally 1: 0.3: 1. According to the determination, the yield of 100 kg per mu of cotton needs to absorb 12 kg of nitrogen, 4 kg of phosphorus pentoxide and 12 kg of potassium oxide, which is 5-6 times that of cereal crops. In addition, some compost, retting fertilizer, manure and urine fertilizer should be applied appropriately in order to promote the high yield of cotton.

Key points of fertilization in each growing period of cotton:

1. Seedling fertilizer

Seedling fertilizer is the first topdressing in the process of planting. Proper topdressing of seedling fertilizer can effectively promote the development of plant roots, expand the roots, enhance the absorptive capacity, speed up transportation and improve the growth of seedlings. Topdressing seedling fertilizer is mainly nitrogen fertilizer, but it should not be overapplied, and the specific amount of application depends on the growth of seedlings and soil fertility. If the application of base fertilizer is insufficient, the growth of seedlings becomes weak, the compound fertilizer with high nitrogen can be used to promote the growth, and if the soil fertility is sufficient and the growth of seedlings is strong, the application of seedling fertilizer can be stopped.

2. Flower bud fertilizer

After the emergence of buds in cotton plants, the need for nutrition is larger, so at this time to strengthen the supplement of nutrition, reasonable topdressing in the bud stage is conducive to the later stage of plant growth. It can not only maintain the common growth of nutrition and reproduction, but also accelerate the growth rate of the plant and make it bear fruit as soon as possible. Flower bud fertilizer can be used with compound fertilizer, dig a ditch around the plant, using the method of ditch application. However, be careful not to let the plant come into contact with fertilizer, especially the root, otherwise the fertilizer will burn the root, cause root injury, and hinder the absorption and transportation of nutrients.

3. Flower and boll fertilizer

It is said that the amount of fertilizer needed gradually increases when cotton buds appear, and the largest amount of fertilizer is needed in the planting process when cotton growth enters the flower-and-boll stage. Therefore, at this time to ensure adequate nutrition for plant growth, the fertilizer can also be replaced by compound fertilizer. The time of topdressing depends on the growth situation, the soil fertility is less, and the cotton growth weakens can be fertilized early properly. Fertilization was mainly carried out after flowering, and 1-2 plants with strong growth were selected to start topdressing when the flowering rate reached 4 / 5.

4. Cover the top fertilizer

The main purpose of topdressing top fertilizer is to prevent cotton from premature senescence caused by lack of nutrition in the late fruiting maturity. Capping fertilizer can enhance plant resistance, maintain plant growth rate, reduce the incidence of plant diseases and insect pests, but also help to increase yield and improve quality. The method and time of fertilization is mainly topdressing outside the root of the plant after topping, and different fertilizers are decided according to the lack of fertilizer in the plant. For example, urea should be applied for nitrogen deficiency and potassium dihydrogen phosphate should be applied for phosphorus deficiency. It can effectively prevent the phenomenon of yellow leaves and premature senility in the later stage of the plant.

The above is the introduction of the ratio of cotton base fertilizer, I hope it will be helpful to everyone.