1. Prevention and control of pests and diseases The timely prevention and control of pests and diseases is an important way to reduce the incidence of premature aging. In recent years, the occurrence of dry and verticillium wilt is an important factor causing premature aging. Therefore, necessary preventive measures must be taken. In the seedling stage, the pesticide soil with the cure and verticillium wilt is sprayed on the bed soil, and then sprayed once before transplanting; when 6 to 7 true leaves are used, the root can be irrigated with the liquid and sprayed with 2000 times of high-efficiency liquid fertilizer. Prevention and promotion; in the early stage of the onset of blight and verticillium wilt, the following agents can be sprayed or rooted 2 to 3 times, and the rooting effect is better. Each plant uses about 200 ml of liquid. The name of the medicament and the rooting concentration are as follows: 50% withered 800 times liquid, 50% withered 600 times liquid, 25% Shi Baike 1500 times liquid, 1.5% phytopathic 800 times liquid, methyl chlorhexidine 800 times liquid .
2. Adding fertilizer The soil organic matter and potassium content are more, which can promote the metabolism of cotton plants and enhance the resistance of cotton plants. Deficiency in flowering and boll stage is an important cause of premature aging. Generally, nitrogen fertilizer can be applied twice in the initial flowering and full flowering period, and phosphorus and potassium fertilizers can be applied simultaneously, and the amount of potassium fertilizer can be appropriately increased, and the watering effect is better. Apply topping fertilizer as needed. The total amount of fertilizer applied is generally not less than 19 kg per 667 square meters of pure nitrogen, not less than 6.5 kg of phosphorus (calcium pentoxide) and not less than 20 kg of potassium (potassium Oxide). The base fertilizer is very important. Generally, the amount of base fertilizer accounts for about 30% of the total fertilization amount.
3. Set up a high-yield shelf to have enough vegetative body before flowering, and combine the pruning in the bud stage to remove the lower 1-2 fruit buds in time to make a better nutrient supply after flowering.
4. Select suitable varieties to choose varieties that are resistant to disease, insects, late growth, and great potential for autumn peaches.
5. Spray nitrogen fertilizer on the root and spray nitrogen fertilizer in a timely manner. It can be sprayed once every 7 to 10 days with 1% to 2% urea solution and 0.3% potassium dihydrogen phosphate solution.
6. Climate regulation If you encounter continuous High Temperature and drought, you should water it in time, and the water should flow through the ground for a certain distance, so that the water temperature rises, then enter the cotton field and adjust the water with water.
7. Improve the cotton field irrigation system The cotton field must be equipped with three ditch to ensure smooth irrigation and drainage. Watering in the dry season, especially to water the flower bell water, conditional can be lightly poured several times to keep the ground flawed.
8. Rotation of the crops in a timely manner as a timely fall, can significantly reduce or avoid the occurrence of premature aging. Especially the water and drought rotation, the effect is obvious. Unconditional rotation with grass crops should be adopted. Avoid rotation with vegetables, especially with cucurbit crops, to avoid accumulation of germs. At the same time, special attention should be paid to increasing the amount of organic fertilizer applied to reduce premature aging.
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