Key points of sowing and Seedling raising techniques of Cotton

First, to prepare the seedbed as soon as possible, we should choose the disease-free land with leeward to the sun, high terrain, convenient drainage and irrigation and low groundwater level as the seedbed.

Second, the application of sufficient seedling bed fertilizer should be based on organic fertilizer, and appropriate amount of phosphorus and potassium fertilizer should be added to achieve a scientific formula. If you use ternary compound fertilizer as seedling bed fertilizer, you must have an appropriate amount. When fertilizing, it is necessary to mix well so as to achieve the goal of fertilizing both soil and seedlings. At the same time, there should be little or no application of urea and ammonium bicarbonate, so as to prevent burning root dead seedlings or cotton seedlings from growing, resulting in weakening disease resistance, underdeveloped roots, prolonged slow seedling stage after transplanting, and formation of stiff seedlings.

Do a good job in seed drying and seed selection

Sunny day seed drying and seed selection should be taken before sowing. Seed drying can break seed dormancy and improve seed vigor, which is beneficial to sowing the whole seedling.

Do a good job of soil disinfection

After the bed soil is prepared, the bowl is made in advance, and the first disinfection is carried out the day before the bowl is made. the bed soil is first added with enough water and mixed and leveled, and when the bowl is made, it is drenched on the surface of the bed soil with 250 times of methyl chloronitrobenzene or 300 times of pentachloronitrobenzene, or 150 grams of dimethazone per mu is sprayed on the surface of the bed soil one week before making the bowl, and then make the bowl. When you make a good bowl, you should sprinkle carbofuran to prevent it from being destroyed, and then cover it with agricultural film to prevent Rain Water from destroying the bowl. The second disinfection was carried out when the seeds were sown, and the bowl was sprayed with methyl chlorpromazine 250 times 300 times, then sowed, covered with soil cover, and then disinfected for the third time (same as above). The cover soil should not use cotton field topsoil because there are a large number of pathogens in the topsoil. After emergence, it is necessary to control seedling diseases such as blight and quenching disease in time. At the same time, drying bed dehumidification, promote deep root, to ensure that the cotton field is not infected by diseases.

Ensure timely sowing

As the saying goes, early in the morning, the Beginning of Summer late, Grain Rain before the emergence of seedlings at the right time. The suitable sowing time is that the temperature is stable above 15 ℃, and the seeds are usually sown in the morning of sunny day in the first and middle of April. Do not sow in March, because the sowing is too early, the air temperature and ground temperature are very low, and the cold current is frequent. Although it is easy to emerge seedlings, it is difficult to protect seedlings, and there will be a large number of dead and diseased seedlings, bringing passivity to the production throughout the year.

Pay attention to sowing quality

First, when sowing, farmers must pay attention to the weather forecast and start sowing when there are more than three sunny days in a row. When sowing, cover the soil while sowing, and cover the film while disinfecting, so as to facilitate the warming of the seedbed. Don't sow seeds on rainy days. After 4 pm, because the temperature of the seedbed can not rise at night, it is best not to sow seeds. Practice has proved that the emergence rates of the same seeds sown in sunny and cloudy days are not the same, and the emergence rates of sowing in the morning and after 4: 00 p. M. are also different.

Second, we should adhere to the "two wet and one dry" sowing, that is, the bowl is wet, the cover soil is wet, and the seeds are dry. It is necessary to sow seeds after making bowls, but not sowing while making bowls. Because of inconsistent moisture and temperature, and inconsistent emergence of seedlings, it can lead to incomplete and uneven cotton seedlings and inconvenient management.

Manage the seedbed scientifically

First, it is necessary to open the trench and lift the bed in time to prevent the drying of the waterlogged seedling bed, which is conducive to the deep root system of cotton seedlings, cultivate a strong root group, and improve disease resistance. It is necessary to truly achieve dry root, hot root and aerobic root, cultivate strong root groups, and lay the foundation for promoting the early development of cotton seedlings.

Second, control the temperature in the film to prevent burning seedlings before keeping warm and moisturizing, do not uncover the film. Covered with double film, when the emergence rate of the seedling bed reaches 70%, remove a layer of plastic film at about 8: 00 am on a sunny day. After the seedlings, uncover the film and dry the bed on a sunny day and spray a half-dose Bordeaux solution to prevent the disease. From the end of the seedling to the front of a true leaf, the temperature in the film should be 20 ℃ ~ 30 ℃, and both ends of the film should be opened to prevent the seedlings from burning at high temperature.

Third, after the cotton seedling has a true leaf, when the previous crop can not be transplanted in time, the squatting seedling can be moved to promote the root growth and shorten the slow seedling period.

Strong seedling transplanting

When the seedling is 10-12 cm high, has 3-4 true leaves, and the white root is full of bowls, it can be transplanted to the field with medicine and fertilizer.