High yield of cotton foliar fertilizer spraying

First, foliar spraying nitrogen to prevent premature senility. When the cotton was nitrogen deficient, the leaves were light yellow, the lower leaves were yellow and withered, the fruit branches were few, the flowers and bolls were sparse, and the cotton yield and quality were affected at the initial stage of boll opening. Fertilizer spraying method: prepare 1% urea solution, spray 100 kg per mu, spray once every 7-10 days, and spray 2-3 times continuously. Second, boron is sprayed on the leaves and peaches are more fruitful. When the cotton plant is boron deficient, the fruit branches are high, the lateral branches are many, the leaves are thick, and the bracts of buds are easy to open and fall off, resulting in buds, no flowers, fewer flowers and fewer bolls. The fertilizer spraying method: 0.2% borax or 0.1% boric acid solution was sprayed with 0.2% borax or 0.1% boric acid solution at bud stage, full flowering stage and boll stage. If 0.3% urea is added to the boron fertilizer solution, better results will be obtained. Third, foliar spraying phosphorus to promote early ripening. Foliar phosphorus spraying can promote cotton plants to be strong but not prosperous in the early stage, improve boll formation rate, and promote seed fullness, boll weight and boll opening early in the later stage. Cotton phosphorus can be sprayed with 0.2% potassium dihydrogen phosphate or 0.5% calcium superphosphate aqueous solution, once every 7 days and 2 times in a row.