Scientific use of chemical control cotton can increase production

Scientific chemical control of cotton is an important scientific measure to increase cotton yield. Chemical control technology has three advantages: first, it is conducive to the early development of strong seedlings, controlling high and stable growth, and making it easy to give play to the advantages of increasing production; the second is to simplify cotton field management, save labor and cost; and third, to promote the transformation of second and third types of cotton seedlings, balanced development, increase production and increase efficiency. The principle of chemical control, "a small number of times, light control and frequent adjustment", should be mastered "control over and over again" or "control once at an interval" (to be flexibly mastered according to soil fertility, rainfall, and growth), and it is best to "divide the dosage into three times" to ensure that the plant grows steadily from beginning to end. If the chemical control is not good, it can cause crazy growth or stiff seedlings, affecting the normal growth of cotton. Therefore, in the process of chemical control, it is necessary to strictly control the use of chemical control agents.

Soak the seeds at the sowing time. At present, most of the cotton planting methods are bowl sowing. Before sowing, the seed soaking solution is made of 98% thalidomide (buzz) 1 g to water 6 kg ~ 10 kg. The cotton seeds to be sowed are put into the soaking solution, soaked for 10 to 12 hours, the seeds and soaking solution are suitable at 1:2, the concentration of the tufted seeds can be lower, and the concentration of the untufted seeds can be higher, and the soaked seeds can be sowed after drying. It can promote the early development of cotton seedlings and control underground diseases and insect pests.

Spray the top at the seedling stage. About 10 days after the emergence of cotton seedlings, up to one leaf or two leaves, 98% acetylamine can be used to spray 80 kg ~ 100 kg of water evenly on the top of cotton seedlings.

Spray at seedling stage. When the cotton reaches 8-10 leaves and the plant height is 20-30 cm, 98% acetamide is used to spray 20 kg-30 kg of water per mu.

Help to be strong at the bud stage and the early flowering stage. The main stem of cotton has 10-16 leaves and a plant height of 50-60 cm. When it is found that cotton is in flower, 98% acetylamine is sprayed evenly on the upper part of the cotton plant with 2-3g per mu and 15kg-20kg of water, which can generally reduce the plant height by 5cm. This is the best time to shape the ideal crown structure, delay ridge sealing, simplify pruning and reduce shedding. It can promote the root system to tie down, adjust water and fertilizer to make the plant stable and early flowering.

Increase the boll in the flower and boll period. About a week after the cotton was topped at the flower and boll stage, 98% thalidomide 4-6 g to 20 kg ~ 25 kg of water per mu was sprayed on the leaves to control the growth of the upper fruit branches and inhibit the growth of sprouts, enhance root activity, increase buds and bolls, and coordinate to prevent premature senescence of cotton, protect leaves and promote peaches, increase efficiency and increase yield significantly.

Matters needing attention in Chemical Control of Cotton

1. If the amount of propranolol is small, it is best to mix it into mother liquid first, and then prepare it according to the required concentration to avoid using too much or too little medicine. Its pharmacodynamic period on cotton is about 15 days, so be careful not to interrupt it.

2. The use of thalidomide should be combined with topdressing, and should not be fertilized less because of the thick green leaf color caused by the use of drugs. It is best to leave a control line at the edge of the field to see if there is a lack of fertilizer.

3. The time of chemical control. Thalidomide is easy to oxidize and decompose under strong light and reduce the efficacy, so spraying under strong light and high temperature should be avoided. In summer, it is better to spray under a period of light after a high temperature in the afternoon, and pay attention to weather changes. Spraying can exert the maximum effect when the relative humidity is high in the field.

4. Cotton leaves absorb metoprolol quickly and output slowly. Within 2 hours after spraying, it is a fast absorption period, which can absorb half of the total amount of spraying. It slows down after 2 to 6 hours, and basically absorbs enough action after 6 hours. Therefore, if it rains within 6 hours after spraying, it needs to be re-sprayed.

5. The use times and dosage of plant growth regulators should be flexibly controlled according to variety, climate, density, cotton plant growth and water and fertilizer.

6. On the basis of chemical regulation and control, we should do a good job of hoeing, loosening and pruning.