In the late period of cotton, it is appropriate to apply fertilizer, prevent diseases and increase production.

Around the middle and late September is the late growth period of cotton. At this stage, the absorption capacity of nutrients in the roots of cotton is obviously reduced. However, if nitrogen, phosphorus, potassium, zinc, boron and other fertilizers are applied to cotton leaves, it can prevent premature aging. Promoting early maturing, disease prevention, anti-dropping bells, and knotting peaches have significant effect on yield increase. (1) Apply nitrogen fertilizer to prevent premature aging. Each acre with 1% urea solution 75 to 100 kg, sprayed every 5 to 7 days, even spray 2 to 3 times, can enhance the photosynthesis of the leaves, to prevent premature aging, increase production. (2) Apply phosphate fertilizer to promote early maturity. Phosphate fertilizer applied to the leaves of cotton in the later stage can promote the fullness of the seeds, increase the boll weight, and advance the boll opening. The method is to use 1 kg of superphosphate and add 50 kg of water. After soaking for 12 hours, apply 75 kg per mu. (3) Apply K fertilizer to prevent disease. The lack of potassium in cotton in the later period is likely to occur with blight during the period of boll-lining, leading to a severe reduction in cotton production. The method of spraying potassium fertilizer on the cotton leaf surface is to use a 0.3% potassium dihydrogen phosphate solution per acre of 75 to 100 kilograms, spray the whole plant, and spray it for 2 to 3 times. (4) Apply zinc fertilizer to prevent falling bells. In the later period of cotton, it is easy to suffer from zinc deficiency, which will cause local chlorosis of the leaves, wilting of young leaves, and falling off of young bells, making it difficult to cover the top peach. The method of spraying zinc on the leaves of cotton is spraying 0.1 to 0.2% of zinc sulfate or 75 kg of zinc chloride aqueous solution per acre, spraying once every 5 to 7 days, and continuously spraying 2 to 3 times. (5) Boron fertilizer is applied to peaches. In the late growth stage of cotton, it is easy to lack boron, so that the fruit node position is increased, the lateral branches are increased, resulting in fewer flowers and fewer bells, and the yield is reduced. The timely application of boron fertilizer is beneficial to multi-fruit peach and knot peach, and 0.2% boric acid can be sprayed at full flowering stage. Or 0.15% boric acid solution 100 kilograms, even spray 2 or 3 times.