The first chemical control of cotton is very important, pay attention to details and make mistakes.
In the summer, cotton will usher in the first chemical control. This is a very important task, related to the formation of thick stems of cotton and the construction of developed roots. The first control operation is completed, which is conducive to the initiative of the whole year; if it happens, it may lose the opportunity and form a passive operation. Under the situation of high cost of cotton planting and declining income, cotton farmers must learn important technologies with low input and high output.
In June, the temperature climbed and the cotton seedlings entered the first rapid growth period. Therefore, at this time, it should be measured by fixed-point survey to timely understand the daily elongation rate of cotton seedlings. If it exceeds the normal range, chemical control drugs should be sprayed to restore the growth rate to normal levels, and the internodes should be shortened and the leaves reduced. Over-expansion of vegetative growth has come down.
How is the date of the first chemical control determined?
If the daily elongation rate of cotton seedlings is higher than the normal range, the air is damp and the soil moisture is good. The highest daily temperature is above 30 °C, which can be controlled on the next day; if the weather is dry, the soil moisture is poor, the day If the maximum temperature is less than 30 °C, it can be temporarily controlled, and the measurement will continue after two days. If it still exceeds the standard, it will be lightly controlled.
How to master the amount of chemical control for the first time?
Calculated according to the dosage of the acre, according to the daily elongation rate of the cotton plant, combined with the weather and soil conditions at that time, the trade-off is determined: if the seedling stage is first controlled, the acre is 0.2-0.4 g of the ketamine; The acre is 0.3 to 0.5 grams of ketamine.
What are the details of the first control?
1. Conduct a fixed-plant survey and obtain a scientific basis. Select a representative section, insert a mark, measure the height of the cotton heart from the ground every morning, and measure it every two or three days to calculate the daily elongation. Generally choose two points, 10 cotton is calculated by the average.
2. Calculate the dispensing solution. Such as artificial spray, 10 kg of liquid can be used. The desired ketamine can be diluted with a small amount of water and poured into a sprayer containing 10 kg of water. Because the chemical control should be carried out several times, and the acetaminophen is stable after adding water, it can be added to the mother liquor by adding 10 times of water in advance, and the mother liquor can be used directly afterwards without affecting the effect.
3. Accurately spray the liquid. Starting quantitative spraying, may not be easy to grasp, if the ground has been sprayed, there is still liquid, indicating that less spray of acre, may affect the effect; if the ground is not sprayed, the liquid has been used up, indicating more medicinal. After a few practices, the dose will be accurately applied as planned.
4. Follow the spray common code. One is to avoid spraying when the wind is strong; the other is to avoid spraying in the case of strong sunlight and large evaporation, and to extend the residence time of the liquid on the plants as much as possible so that the plants can fully absorb. When there is no dew in the morning, it can be sprayed before 10 am and after 4 pm. It can be sprayed all day on a cloudy day. It is strictly forbidden to spray medicine around noon on sunny days.
5. Spray the liquid on the cotton plant. Because the first control cotton plant is small, most of it is bare ground. If artificial spray is used, it should be carried out straight line by line; if using machine spray, each nozzle should be aligned with the cotton line, and the spray width should be narrowed, the liquid volume should be reduced, and the speed should be slowed to avoid spraying a large amount of liquid on the ground. . Chemical control is an operation with a high input-output ratio. It should not pursue high efficiency of operation, but should ensure high quality, and make medicines without waste of drugs.
6. Try to make the top of the cotton plant. The effect of the drug is mainly within 3 to 10 days after spraying, and only when the drug is sprayed onto the top of the cotton plant, the growth of the cotton plant after spraying can be effectively controlled. If only the liquid is sprayed onto the cotton leaf, the cotton leaf cannot be transferred to the top core after absorbing the ketamine. The first time the cotton plant is controlled, the top of the heart is mostly under the cotton leaf. It is recommended to use the point-and-click method when spraying artificially. The nozzle is close to the cotton line, and the spray is sprayed one by one to make the cotton heart fog as much as possible. First control effect.
7. The cotton seedlings are not uniform in the cotton field, try to use artificial spray, by adjusting the walking speed and the amount of medicine to meet the liquid demand of different cotton seedlings. More should adhere to the principle of single line, narrow range, slow line, small liquid volume. In case of a small seedling, speed up walking, so that it is less medicine; in case of late seedlings, the switch is not sprayed; no spray or no spray is applied at the ground.
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