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Factors affecting the shedding of bells in the light: In the closed cotton field, the lower part of the cotton plant receives less light, the photosynthesis is reduced, and the supply of organic nutrients is insufficient, resulting in falling bells. Temperature: Daily average temperatures below 20°C or above 32°C will increase the shedding of bells. Moisture: Too little or too much soil moisture will increase the shedding of bells. Mineral nutrition: If the supply of fertilizers is insufficient, improper matching or inappropriate application period will also increase the shedding of the bells. Pest and harm: Some diseases and insect pests can affect the normal physiological process of cotton plants, and some directly harm flowers, buds and bells, resulting in a large number of shedding of the bells. Mechanical damage: mechanical damage caused by man, animal, and equipment operations in the field and mechanical damage caused by strong winds, hail and other natural disasters can also easily cause the fall of the bolls.
Measures to reduce the shedding of bells to improve lighting conditions in cotton fields: timely and reasonable pruning to improve the light transmission in the field. The topping of cotton should be based on the principle of "When it does not wait for branches and branches to not equal". According to the situation, in the dense field, cut the empty branches and hit the side of the heart work and hit the old leaves. Scientific control: For cotton fields that are prosperous or prosperous, they can be controlled. During the flowering period (from the end of July to the beginning of August), there are 3 to 5 grams of DPC. Drought and excessive growth should be lightly controlled; when there is more rain and over-emergence, the number of chemical controls should be increased as appropriate. Scientific fertilization and irrigation: The control of a type of cotton field should be dominant, and the second type of cotton field should be controlled first and then promoted. It can apply 2-3 kg of urea per acre after the budding period. Weak seedlings on thin cotton fields should be promoted mainly, in the bud stage urea application of 3 to 5 kg. If the base fertilizer is organic fertilizer and potassium fertilizer is insufficient, 25 kg of cake fertilizer, 5 kg of potassium sulfate or potassium chloride can be used per mu. According to the lyrics (soil moisture content dropped to 17%), seedlings (dark leaf, cotton stems more than 2/3) cleverly budding water. The flowering and bolling period is the situation in which the cotton needs the most fertilizer and water during the entire growth and development period (the soil moisture content is reduced to 17%), and the seedling condition (dark leaf color, the red stem of the cotton plant exceeds 2/3) cleverly buds water. The flowering and boll stage is the period when the cotton needs the most fertilizer and water during its entire growth and development period. For cotton fields with high fertility, good lyrics, and strong growth of cotton plants, fertilizers can be topdressed at full flowering stage; for cotton fields with poor fertility, poor sensation, and weak cotton growth, they should be applied early and reused, and can be topdressed at the early flowering stage. Generally, in mid- and late July, the NPK compound fertilizer is 15 to 20 kilograms per mu, and watering is timely according to the public opinion. Generally no trace of fertilizing material after August 10th. Strengthen the prevention and control of pests and diseases: control bollworm, use 20% solution of methomyl to spray 1000 times at the peak of spawning, and use 28% Anmoem 1000 times solution plus 25% Guangzhi 1000 times solution to prevent and cure in the larval stage. Cotton aphid, when the victim in the cotton field leaf, oil-like cotton plant strain rate of 5% when the timely prevention and treatment of disease prevention and control in the early stages of the use of fungicides control. Minimize the shedding caused by pests and diseases.
How to reduce the shedding of cotton buds
The peak period of flowering and bolling in cotton is also the peak period of shedding of the bells, especially the recent rain is more than in the same period in previous years, and the shedding of cotton bolls is more serious than in previous years. How to reduce the shedding of the bells and increase the rate of becoming bells is a concern for cotton farmers.