Cotton normal growth and development need more elements of nitrogen, phosphorus, potassium, iron, zinc, copper, manganese and the like. Studies have shown that formation per 100 kg of cotton lint needs to absorb about 13.35 kg of pure nitrogen, phosphorus pentoxide, 4.65 kg, 13.35 kg potassium, with the amount of fertilizer needed to improve production levels increases. Different varieties and production levels are slightly different. Cotton seedling, absorbing 5% nitrogen, 3% phosphorus, potassium, 3% active; squaring to early flowering, absorbing 11% of nitrogen, phosphorus 7%, 9% effective potassium; early flowering flowering to absorb 56% nitrogen, 24% phosphorus, 36% active potassium; Xu beginning of flowering to absorb 23% nitrogen, 52% phosphorus, 42% active potassium; after boll opening, absorbing 5% nitrogen, 14% phosphorus, effective 10% potassium. It can be seen that the peak period of cotton absorption is in the flowering and boll period, the peak of nitrogen absorption is in the flowering stage, and the peak of phosphorus and potassium absorption is from the flowering stage to the boll opening stage. Zinc, boron, manganese and other elements according to the soil nutrient supply situation, due to lack of filled, targeted use. Cotton requires high fertility in cotton fields, so it is necessary to apply adequate fertilizer in a timely manner. Generally, it is necessary to grasp the principle of lightness and weight before, due to the time, time, and seedlings.
First, the base fertilizer should be applied to the base fertilizer, which should be based on organic fertilizer. Generally, the farmer's fertilizer is about 2,000 kg. Under the condition of 30%~50% of nitrogen fertilizer, all phosphate fertilizer, 50%~100% of potash fertilizer. . Summer cotton that does not have the conditions for applying the base fertilizer can be chased early in the seedling stage. Cotton is sensitive to zinc and boron, and the soil supply in most cotton areas of our province is relatively insufficient. It is recommended to apply zinc fertilizer (zinc sulfate) 1~2 kg per mu and 0.5 kg of boron fertilizer. The cotton formula fertilizer also contains nutrients such as nitrogen, phosphorus, potassium, zinc and boron. It is best to select the suitable cotton compound fertilizer according to the characteristics of soil nutrients and management level, generally 40-50 kg per mu.
Second, the topdressing and topdressing is mainly based on nitrogen fertilizer, which is generally carried out twice in the initial flowering stage and in the Shengling period. The ratio of two fertilizations is 1:2. In the early flowering stage, the seedlings tend to be better and stronger, and the first top dressing can be omitted. Those who are accustomed to one-time top dressing can be carried out in the early stage of the flower bell (when there are 1 or 2 young bells per plant). Phosphate fertilizer is mainly used as base fertilizer, which can meet the needs of cotton during the whole growth period, so cotton is generally no longer applied with phosphate fertilizer. If you need to apply potassium fertilizer, you can cooperate with nitrogen fertilizer and apply it during the Shengling period.
Third, the application of top cover fertilizer top cover fertilizer is mainly to prevent cotton deficiency and premature aging in the late stage, in order to fight for more knotted autumn peach and increase the weight of the bell. At this time, the fertilizer is inconvenient to be applied to the soil, and the root dressing is generally applied, and the foliar fertilizer is sprayed. Spray “Tianda 2116†cotton special type foliar fertilizer 600 times liquid, spray once every 10~15 days, a total of 3~4 times.
First, the base fertilizer should be applied to the base fertilizer, which should be based on organic fertilizer. Generally, the farmer's fertilizer is about 2,000 kg. Under the condition of 30%~50% of nitrogen fertilizer, all phosphate fertilizer, 50%~100% of potash fertilizer. . Summer cotton that does not have the conditions for applying the base fertilizer can be chased early in the seedling stage. Cotton is sensitive to zinc and boron, and the soil supply in most cotton areas of our province is relatively insufficient. It is recommended to apply zinc fertilizer (zinc sulfate) 1~2 kg per mu and 0.5 kg of boron fertilizer. The cotton formula fertilizer also contains nutrients such as nitrogen, phosphorus, potassium, zinc and boron. It is best to select the suitable cotton compound fertilizer according to the characteristics of soil nutrients and management level, generally 40-50 kg per mu.
Second, the topdressing and topdressing is mainly based on nitrogen fertilizer, which is generally carried out twice in the initial flowering stage and in the Shengling period. The ratio of two fertilizations is 1:2. In the early flowering stage, the seedlings tend to be better and stronger, and the first top dressing can be omitted. Those who are accustomed to one-time top dressing can be carried out in the early stage of the flower bell (when there are 1 or 2 young bells per plant). Phosphate fertilizer is mainly used as base fertilizer, which can meet the needs of cotton during the whole growth period, so cotton is generally no longer applied with phosphate fertilizer. If you need to apply potassium fertilizer, you can cooperate with nitrogen fertilizer and apply it during the Shengling period.
Third, the application of top cover fertilizer top cover fertilizer is mainly to prevent cotton deficiency and premature aging in the late stage, in order to fight for more knotted autumn peach and increase the weight of the bell. At this time, the fertilizer is inconvenient to be applied to the soil, and the root dressing is generally applied, and the foliar fertilizer is sprayed. Spray “Tianda 2116†cotton special type foliar fertilizer 600 times liquid, spray once every 10~15 days, a total of 3~4 times.
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