Take targeted measures to strengthen the management of cotton in the middle and later stage

This year, cotton is affected by unfavorable weather such as low temperature, overcast and rain, lack of sunshine, etc., and a large area of plants grow weakly and develop late. In addition, natural disasters such as recent torrential rains and typhoons occur frequently, so the situation of cotton production is very grim. At present, cotton is in a critical period of growth, and various localities should take targeted technical measures to strengthen the management of cotton fields, promote the transformation of seedling conditions, and strive to achieve a bumper cotton harvest.

1. Fertilizer operation. Focus on the application of top fertilizer and mixed spraying of drug fertilizer in the later stage, generally applying urea 5-7.5 kg per mu to increase boll weight and prevent premature senility. In the cotton fields with late boll setting, less bolls in the middle and lower parts, or sufficient amount of flower and boll fertilizer and late application time, in the cotton fields where cotton plants were still growing vigorously in the Beginning of Autumn, fertilizer was mainly sprayed and supplementary fertilizer was applied in the areas lacking fertilizer. Potassium and boron-deficient cotton fields should be sprayed with potassium and boron fertilizer in time combined with pest control.

2. hit the top at the right time. In view of the late development of cotton, small shelves and few fruit branches this year, topping should be treated differently according to the growth and development and closure of cotton in different fields, and grasp the principle of "time to unequal branches and branches to unequal time". Flexibly control the time of topping. Timely removal of late buds and ineffective buds to reduce nutrition consumption. The flowering and boll setting period of cotton was adjusted in the best period, focusing on multi-knot peach and early autumn peach.

3. Prevent diseases and insects. Improve the growth environment of cotton and keep the soil dry and wet. Cotton Verticillium wilt is seriously affected. Carbendazim or mancozeb can be used to control cotton wilt, and potassium dihydrogen phosphate solution is sprayed to supplement potassium fertilizer to enhance cotton disease resistance. Pay close attention to the occurrence of insect pests in cotton fields, such as Bemisia Tabaci, Bemisia Tabaci and Helicoverpa armigera, and control them in time to ensure the steady growth of cotton plants. 35% endosulfan EC or 48% chlorpyrifos EC can be used to control bug bugs, spraying once every 3-4 days. To control Bemisia Tabaci, Baxing (20% fenoylhydrazide suspension), carbaryl salt and aphid (2.5% hyperosmotic imidacloprid EC) can be used. Bt preparation, avermectin and other biological agents and pyrethroids and organophosphorus pesticides can be used to control cotton bollworm.

4. Pick yellow peaches. Pick yellow peach and rotten peach in time to increase yield, improve quality and reduce loss.

5. Chemical ripening. Cotton late, late peach, late in case of low temperature, rain, few light, greedy green late ripening, can not normally crack and open bolls, can spray 40% ethephon 150-200ml per mu to promote cotton bolls to mature faster.

6. Anti-disaster measures. Dredging and opening the "three ditches" in cotton fields, so that open water can drain and dark water can be filtered, so as to prevent waterlogging damage caused by continuous rain in autumn, reduce the humidity of cotton fields, reduce the occurrence of cotton diseases, and create good environmental conditions for the normal growth and development of cotton. Combined with topdressing to cultivate soil roots, improve soil permeability, promote cotton plant to produce new roots, enhance root absorption capacity, prevent plant premature senescence and improve cotton defense ability against typhoon and rainstorm in the middle and later stages.