The mutual influence of meteorological conditions and nutritional conditions leads to the imbalance of cotton plant metabolism and nutritional deficiencies, resulting in physiological shedding of bud bells; diseases such as cotton stink bugs, cotton bollworm, cotton aphid and cotton wilt disease can directly or indirectly cause bud bells to fall off; storms The damage caused by hail will cause the increase of lei bell drop.
The main management measures to reduce the loss of Lei Ling: One is to improve the conditions of fertilizer and water supply. For the infertile cotton fields and the lack of fertilizer and water supply, topdressing urea 10-15 kg/mu to prevent premature aging, fertilize first and then water when the soil is dry. In order to prevent the cotton from becoming green and late, it can be sprayed with foliar fertilizer from mid-late July to mid-August to supplement nutrition, sprayed with a mixture of potassium dihydrogen phosphate, borax, and sugar, sprayed once every 7 to 10 days, continuous spray 2 ~3 times. The second is to improve the light conditions in cotton fields. Pruning and topping in time after the closure of the bank to improve the field permeability, improve photosynthesis, and make the photosynthesis of the middle and lower leaves proceed normally. The third is scientific chemistry regulation. For high-fat water cotton fields, from the current bud stage, use a tonic, to regulate the vegetative and reproductive growth of cotton plants, control plants, and dwarf plant types. The fourth is to find out the regularity of the occurrence of diseases and insect pests, and to prevent and control them at the initial stage of the disease.
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