First, spraying nitrogen to prevent premature aging. When cotton lacks nitrogen, the leaves are light yellow, the lower leaves are dry, there are few fruit branches, the bells are thin, and the initial period of boll opening is fading, which affects the cotton yield and quality. Spray fertilizer method: formulated as a 1% urea solution, spray 100 kg per acre, spray once every 7-10 days, and spray 2 or 3 times. Second, spray more boron on the peach leaves. When the cotton plants are deficient in boron, the fruit branches have high nodes, many lateral branches, and thick leaves. The buds of the buds tend to open and fall off, resulting in no buds and fewer flowers. The method of spraying fertilizer is: spraying in 0.2% borax or 0.1% boric acid solution at bud stage, flowering stage and flowering stage. If 0.3% urea is added to the boron fertilizer solution, better results will be obtained. Third, spraying phosphorus to promote premature. Phosphate spraying on the leaves can promote the growth of the cotton plant without rushing and increase the rate of becoming a bell. In the later stage, it can promote the fullness of the seeds, increase the boll weight, and advance the boll opening. Phosphate sprayed with cotton may be sprayed with 0.2% potassium dihydrogen phosphate or 0.5% aqueous solution of superphosphate, sprayed once every 7 to 10 days, and sprayed for 2 to 3 times.
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