First, the factors that affect the shedding of bells:
1. Physiological disorders: light, in the closed cotton fields, the lower part of the cotton plant receives less light, photosynthesis is reduced, the supply of organic nutrients is insufficient, resulting in falling bell ringing. Temperature, daily average temperature lower than 20 °C or higher than 32 °C will increase the bell drop. Moisture, excessive soil moisture, will increase the bell drop. Mineral nutrients, if the supply of fertilizer is insufficient, improper cooperation or inappropriate application period will also increase the shedding of bells.
2. Pests and diseases: Some pests and diseases can affect the normal physiological process of cotton plants, and some directly damage flowers, buds and bells, resulting in a large number of Lei Ling bell.
3. Mechanical damage: The mechanical damage caused by man, animal, and equipment operations in the field and the mechanical damage caused by strong winds, hail and other natural disasters can easily cause the fall of the bolls.
Second, to reduce the shedding of bells:
1. Timely and reasonable pruning to improve the light transmission in the field. The topping of cotton should be based on the principle of “time to time and branch to branchâ€. According to the situation, the heavy-duty fields are used to cut empty branches and work hard to beat the old leaves.
2. Scientific control. For cotton fields that are prosperous or prosperous, they can be controlled. 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.
3. Scientific fertilization irrigation. One type of cotton field should be controlled mainly, 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 Shenglei 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 decreased to 17%), seedlings (dark leaves, cotton plants fall more than 2/3 red stems) skillfully budding 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.
4. Strengthen pest control. Prevention and control of cotton bollworm, in the peak period of spawning with 20% methomyl 1000 times spray control, in the larval period with 28% animosperm 1000 times and 25% Guangzhi 1000 times spray control; control cotton aphid, when The cotton plants with wound leaf and oily matter in the damaged cotton field can be prevented and treated timely when the strain rate reaches 5%; and the prevention and control of diseases should be controlled with fungicides at the early stage of disease. Minimize the shedding caused by pests and diseases.
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