With the temperature rising from late May to early June, cotton seedlings entered the first rapid growth period. Generally, the main stem daily elongation of cotton plants is used as the main index to determine the growth rate. At this time, the amount of daily elongation rose from less than 0.5 centimeters to more than 0.5 centimeters or even more than 1 centimeter. If it is allowed to stretch freely, it may reach 1.5 centimeters or more. This growth rate of seedling stage is harmful to the growth and development of cotton plants, and it is unprofitable. Firstly, the lower stalks of cotton plants are soft and soft. This causes the hidden troubles of the cotton plants to lay down late, and the strong fruiting branches cannot grow on the soft stalks. The second is that the above ground is long and long, it will affect the growth of the underground, which is not conducive to the formation of a strong and robust root system; The third is the slender stalks, internodes and large leaves, all are excessively vegetative growth, not conducive to nourishment. The use of savings.
Therefore, at this time, the survey should be conducted through fixed surveys to understand the daily growth rate of cotton seedlings. If it exceeds the normal range, chemical control drugs should be sprayed so that the growth rate can return to normal levels and the internodes can be shortened and the leaves can be reduced. The vegetative growth of over-prosperity has come down.
How to determine the date of the first chemical control?
If it is determined that the daily growth rate of cotton seedlings is higher than the normal range, then the air is more humid, the soil moisture is better, and the maximum daily temperature is above 30°C, and can be controlled the next day; if the weather is dry, soil moisture is poor, If the maximum temperature is less than 30°C, it may not be controlled for a while. After two days, it will continue to measure. If it exceeds the limit, it will be slightly controlled.
What drug control is best for use?
Dinoamines, which are still produced by regular manufacturers, are the optimal drugs for control because they are easy to calculate accurately. Meet the national standards for the content of condensation amine impurity requirements below 1.5%, and need to be marked on the medicine box. Because the cotton seedlings are small, the required dose of each strain is extremely low, and the content of impurities is high, which will seriously affect the effect of medication.
How to master the first dose of chemical drugs?
Calculated according to the dosage of mu, according to the daily elongation rate of the cotton plant, combined with the weather and soil conditions at that time, trade-offs were made: If the seedling stage is first controlled, 0.2-0.4 g of dipotoxamine is used; for example, the budding period is first controlled. , Use 0.3 ~ 0.5 grams of dilute amines.
What are the first steps to control the details?
1. Conduct a survey on a fixed plant to obtain a scientific basis. Select the representative section, insert the mark, measure the height of the cotton heart from the ground every morning, and measure it once every two or three days to calculate the daily elongation. Generally choose two points, 10 cottons are calculated on average.
2. Calculate the formulated liquid. Such as artificial spray, mu can be used 10 kg liquid. You can dilute the required amount of DHA with a small amount of water and pour it into a sprayer with 10 kg of water. Due to chemical control to be carried out several times, and after the stabilizing amine is very stable after adding water, 10 times of water can be added in advance to form the mother liquor, and then the mother liquor can be directly used without affecting the effect.
3. Spray the liquid accurately. Quantitative spraying may be difficult to grasp. If the ground has been sprayed, there are still liquids left, indicating that there are fewer sprays on the mu, which may affect the effect; if the ground is not sprayed, the liquid has been used up, indicating that the medicine is used more. After a few practices, the amount of the drug will be accurately sprayed as planned.
4. Follow the spray common code. The first is to avoid spraying when the wind is strong; the second is to avoid spraying under conditions of strong sunlight and large evaporation, and to extend the time for the liquid to stay on the plants so that the plants can fully absorb them. When there is no dew in the morning, it can be sprayed before 10 a.m. and after 4 p.m. It can be sprayed all day on cloudy days. It is forbidden to spray before and after sunny noon.
5. The liquid is sprayed onto the cotton plant. Due to the small size of the first-time controlled cotton plant, most of them are bare ground. If artificial spray is used, it should be carried out line by line; if machine spray is used, each nozzle should be aligned with cotton, and the spray width should be narrowed to reduce the amount of liquid and slow to avoid spraying a large amount of liquid onto the ground. . Chemical control is an operation with a high input-to-output ratio. It should not seek to operate with high efficiency. Instead, it should ensure high quality and ensure that medicines are kept alive without waste.
6. Try to make the top of the cotton plant medicine. The role of the drug is mainly within 3 to 10 days after spraying. Only spraying the drug on the top of the cotton plant can effectively control the growth of the cotton plant after spraying. If only the liquid is sprayed on the cotton leaves, the cotton leaves cannot transfer it to the top of the heart after absorbing the chitosan. For the first time, the cotton plants at the time of chemical control are mostly under the cotton leaves. It is recommended that the manual spray be used in a point-and-button method. The nozzles should be close to the cotton line, and the sprays should be deducted from the plants to make the cotton core as fogging as possible to achieve the best. First control effect.
7. Cotton seedlings growing irregularly in the cotton field, as far as possible the use of artificial spray, by adjusting the walking speed and drug size, to meet the needs of different cotton seedlings liquid demand. It should adhere to the principles of single-line, narrow-width, slow-moving, and small-volume fluids. In the event of smaller seedlings, they will speed up walking so that they will have less medicine; in the event of late seedlings turning off the switch, they will not spray medicine; spraying less or not spraying medicine at the head of the land.
Chemical control is hard work, meticulous work, and hard work. There is no one-for-peer and one-time approach. There is no unified model, because cotton is appropriate, and it is adapted to local conditions and adapted to the conditions of the day. No matter whether it is artificially or mechanically sprayed, it is best not to cover the whole field at the same rate with the same dose.
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