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Symptoms of potassium deficiency in cotton fields: During the flowering and ringing of cotton, the leaf color of the upper leaves of the main stem of cotton turns from pale yellow to dark green. The macules appear in the green veins, and then turn brown, and the leaves shrink, become brittle, turn reddish-brown, and fall off. The bolls are thin and easy to prematurely decay, and the vascular end of the stems of cotton plants are not infested, and verticillium wilt Analysis of cotton plant stem vascular end was tan. Prevention methods are as follows: 1. Increase cotton farmers' awareness of the application of potash fertilizer, because increasing potash fertilizer can not only accelerate the flower bud differentiation of cotton, reduce the shedding of beetles, but also promote the breathing of nitrogen fertilizer by cotton plants, increase the function of cotton leaves and the production potential. 2. Rational scientific application of potash fertilizer. The absorption of potassium by cotton during the whole growth period is generally less in the early stage and more in the middle and late stages. The absorption of potassium after flowering accounts for about 80% of the whole growth period. Therefore, about 12.5 kilograms of potassium fertilizer should be applied per mu of cotton fields. Bud stage topdressing about 7.5 kilograms, in the middle and late can be appropriate to spray potassium dihydrogen phosphate and other potash, spray once every 7 to 10 days, and even spray about 3 times.