The reasons for the detachment of cotton buds can be basically divided into: physiological shedding, pest damage and climatic factors. The interaction between meteorological conditions and nutritional conditions leads to metabolic disorders of cotton plants, lack of nutrition, and physiological detachment of buds; cotton mites, cotton bollworm, cotton aphid and cotton blight can directly or indirectly cause buds to fall off; Damage caused by hail will cause the buds to fall off;
In the unfavorable meteorological conditions, the lack of light in the field is the most important factor. Due to the large degree of shade in the flower bud period, the light intensity in the middle and lower parts of the cotton field is rapidly reduced, and the light compensation point cannot be achieved. The photosynthesis cannot be carried out normally, and the accumulation of nutrients is less. The buds have insufficient nutrients and fall off.
Main management measures to reduce the loss of buds
- Improve the supply of fertilizer and water. For thin cotton fields, the supply of fertilizer water is insufficient, and the application of urea is 10-15 kg/mu to prevent premature aging. When the soil is dry, it can be fertilized and then watered. In order to prevent cotton glutinous green late maturity, foliar spray fertilizer can be applied in the middle and late July to the middle and late August, supplemented with nutrients, sprayed with potassium dihydrogen phosphate, borax, white sugar mixture, spray once every 7 to 10 days, even spray 2 ~3 times.
- Improve light conditions in cotton fields. After the closure, timely pruning and topping, improve the field permeability, improve photosynthesis, and enable the photosynthesis of the middle and lower leaves to proceed normally.
- Scientific and chemical regulation. For the high-fertilizer cotton field, from the bud stage, use the auxin to regulate the vegetative growth and reproductive growth of the cotton plant, and control the plant and dwarf plant type.
- Find out the law of occurrence of pests and diseases, prevent and control at the initial stage of the disease, and pay special attention to prevent phytotoxicity, protect natural enemies, and protect the ecological environment of cotton fields.
This article URL: How to reduce the loss of buds in cotton planting
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