How to increase the proportion of cotton peach by planting cotton

The types of cotton bud and boll shedding include physiological shedding, pest damage shedding and mechanical damage shedding. In terms of the reasons for physiological shedding, first, excessive application of fertilizer and water resulted in prosperous growth, excessive nutrient consumption in the early stage, and oversupply in the later stage; second, excessive density of cotton fields, serious shading of branches and leaves, less light, weakened photosynthesis, and reduced nutrients produced; third, boron deficiency in some cotton fields, resulting in cotton flowers and fruitless; fourth, high temperature and drought, lack of fertilizer and water or high temperature cotton pollen abortion; fifth, frequent overcast and rain, poor pollination. In terms of disease and insect damage, cotton bug bug, cotton bollworm, Verticillium wilt and other poor control, it is easy to lead to a large number of bud and boll shedding. In terms of mechanical damage, it is mainly caused by improper operation in field management. In addition, the phenomenon of bud and boll shedding caused by blind application of herbicides occurred from time to time in the past two years.

Therefore, in order to improve the peach rate of cotton, we must take comprehensive measures to strengthen fertilizer and water management, focusing on summer peaches, autumn peaches and three peaches, so as to win a high yield and bumper harvest of cotton.

First of all, fertilizer should be applied scientifically. At present, it is the critical period for cotton to apply flower and boll fertilizer and peach fertilizer, and it is necessary to combine the recent forecast rainfall: first, cotton that is blooming and setting bolls should apply high content compound fertilizer 30 jin per mu, combined with potash fertilizer 30 jin per mu; second, cotton with 2 to 3 peaches per plant, urea 20 jin per mu and potassium deficient cotton fields, 20 jin of potash fertilizer should be added. Third, when there are 810 mature peaches per plant, about 30 jin of urea per mu; fourth, cotton fields with serious boron deficiency are sprayed with boron and other boron fertilizer 2 times every 7 days or so.

Secondly, improve the ventilation and light transmission conditions. In order to enhance the permeability of the cotton field, the light intensity should be increased from two aspects: one is to prune and branch thoroughly and remove all the branches and buds from the shaded larger cotton field. For the cotton with thin density, one or two branches can be left, the top can be removed, and two secondary fruit branches can be retained. Second, the use of delayed plant growth regulator metoprolol or zhuangsu spray, due to the seedling system per mu, with 1 gram of metoprolol or 4ml of prophylaxis, can better control the cotton plant type, prevent premature closure, and ensure ventilation and light transmission.

Third, prevent insect pests. The third generation cotton bollworm and cotton bug bug occur to varying degrees in various places. In order to prevent them in time before the arrival of the peak period, 2% methylaminoavermectin benzoate wettable liquid, 40% chlorpyrifos, and Lesben EC can be used for prevention. Increasing the application of potassium fertilizer in cotton fields with Fusarium wilt can enhance the ability of defense and recovery.