1. Physiological shedding: Physiological shedding accounts for about 60% to 70% of the total amount of shedding of the bell, mainly due to improper management and pest and disease, resulting in malnutrition of the plant and insufficient nutrition of the boll. There are mainly three aspects as follows: 1. Roots are stunted, absorbing water and nutrients are insufficient, cotton plants are short and yellow and weak, or due to cotton aphid and spider mites, leaves produce less nutrients. 2. Inadequate density and management, increasing conflicts between groups and individuals, shading in cotton fields, poor ventilation and light transmission, affecting the photosynthesis of leaves. 3. The imbalance between vegetative growth and reproductive growth, and the excessive growth of nutrients, results in a serious shortage of nutrients for the vegetative organs, resulting in the formation of a "big empty space."
Second, mechanical shedding: Due to wind, fleas, insect bites, and mechanical damage in the field management, the Lei Ling bell falls off.
Third, no fertilization: When it rains when it is flowering, it cannot be fertilized, or it will encounter high temperatures above 36.5°C, and pollen grains will be damaged and affect fertilization. The main measures to reduce the shedding of bells are: timely prevention of pests and diseases, strengthening of cultivation and management, coordination of fertilizer and water supplies, prevention of shading in cotton fields, and improvement of ventilation and light transmission conditions in cotton fields.
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