Measures to reduce the loss of buds and bells to improve the light conditions of cotton fields: timely and rational pruning, improve the light transmission in the field. The topping of cotton should be carried out according to the principle of “when the time is not equal, the branches are not equal”. According to the situation, in the dense field, cut the branches, work on the side, and hit the lower old leaves. Scientific control: For cotton fields that are prosperous or have a long trend, they can be controlled. During the flowering and boll period (from the end of July to the beginning of August), 3 to 5 grams of ketamine is used per acre. Drought and long-term poor control should be lightly controlled; when there is too much rain and excessive growth, the number of chemical controls should be increased as appropriate. Scientific fertilization and irrigation: For a type of cotton field, the main control should be controlled. The second type of cotton field should be controlled first, and then 2 to 3 kg of urea per acre can be applied after the Shenglei period. For thin and weak seedlings, the cotton field should be promoted mainly, and 3 to 5 kg of urea per mu should be applied in the Shenglei period. If the base is applied with organic fertilizer and potassium fertilizer, 25 kg of cake fertilizer, 5 kg of potassium sulfate or 5 kg of potassium chloride can be applied per mu. According to the lyrics (the soil water content dropped to 17%), the seedlings (the leaves are dark, the cotton plants have more than 2/3 of the red stems). The flowering and bolling period is the most demanding water requirement for the whole growth and development period of cotton (the soil water content drops to 17%), and the seedling condition (the color of the leaves is dark, and the red stem of the cotton plant exceeds 2/3). The flowering and boll period is the period in which the cotton needs most water during the whole growth and development period. For cotton fields with high fertility, good sensation and strong growth of cotton plants, they can be topdressed during the flowering period; for cotton fields with general fertility, poor lyrics and weak cotton plants, they should be applied early and reapplied, and can be topdressed at the early flowering stage. Generally, in the middle and late July, 15 to 20 kg of nitrogen and potassium compound fertilizer per acre is applied, and water is timely poured according to the grievance. Generally no longer apply fertilizer after August 10. Strengthen the prevention and control of pests and diseases: control of cotton bollworms, use 20% methomyl 1000 times liquid spray control at the peak of spawning, control with 28% chlorhexidine 1000 times liquid and 25% Guangzhi 1000 times liquid spray in the larval stage Cotton aphid, timely control when the rate of cotton leaves in the damaged cotton field is 5%, and the disease prevention and control should be controlled with fungicides at the beginning of the disease. Minimize the shedding caused by pests and diseases.