One is physical shedding. Physiological shedding accounts for about 60%-70% of the total loss of avulsing bells, which is mainly due to improper management and pests and diseases, resulting in malnutrition of plants and the lack of nutrients needed by the bolls. There are three main reasons: 1. The roots are stunted, and the absorption of water and nutrients is insufficient. The cotton plants are short and yellow and weak, or due to cotton aphid and spider mites, the 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."
The second is mechanical shedding. Winds, lice, insect bites, and mechanical damage during field management cause the bells to fall off.
The third is not fertilized. When it rains during flowering, it cannot be fertilized, or it encounters high temperatures above 36.5°C, and pollen grains are destroyed 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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