How to fertilize cotton in the later stage?

How to fertilize cotton in the later stage? Please introduce the method in the late growth period of cotton around mid-late September, during which the nutrient absorption capacity of cotton roots decreased obviously, but if nitrogen, phosphorus, potassium, zinc, boron and other fertilizers were sprayed on cotton leaves, it can play the role of preventing premature senescence, promoting precocious maturity, preventing diseases, preventing bolls falling and setting peaches, and has a significant effect on increasing production. ⑴ applied nitrogen fertilizer to prevent premature senility. Spraying 1% urea solution 75 to 100 kg per mu every 5 to 7 days for 3 consecutive times can enhance leaf photosynthesis, prevent premature senility and increase yield. ⑵ applied phosphate fertilizer to promote early ripening. Spraying phosphate fertilizer on cotton leaves in the later stage can promote the fullness of seeds, increase boll weight and open bolls early. The method is to use 1 kg of calcium superphosphate plus 50 kg of water and spray it after soaking for 12 hours, with a dosage of 75 kg per mu. ⑶ applied potash fertilizer to control diseases. Due to the lack of potassium in the later stage, cotton is prone to blight in the boll-setting stage, resulting in a serious reduction in cotton yield. The method of spraying potash fertilizer on cotton leaves is to spray the whole plant with 75 kilograms of 0.3% potassium dihydrogen phosphate solution per mu and spray it 2 times for 3 times. Zinc fertilizer was applied to ⑷ to prevent bell falling. Cotton is easy to lack zinc in the later stage, which will cause local chlorosis of leaves, wilting of young leaves, shedding of new bolls, and it is difficult to cover peaches. The method of spraying zinc on cotton leaves is to spray 75 kg of zinc sulfate or zinc chloride aqueous solution of 0.1% to 0.2% concentration per mu, once every 5 to 7 days, for 2 times in a row. ⑸ applied boron fertilizer to produce big peach. In the later stage of cotton growth, it is easy to lack boron, which increases the node position of fruit branches, increases the number of lateral branches, causes fewer flowers and bolls, and reduces yield. Timely spraying boron fertilizer is beneficial to multi-bearing peaches and big peaches. 0.2% boric acid or 0.15% boric acid solution 100 kg can be sprayed in full bloom for 2 times. Click to get more cotton planting technology click to get more food crop planting technology