The main points of sowing and raising seedlings of cotton
Scientific Formulating Fertilizer Fertilizer
First, early preparation of seedbeds should be done with leeward, sunny terrain, high drainage, convenient irrigation and drainage, and a low water table.
Second, the application of seedbed fertilizer should be dominated by organic fertilizer, appropriate amount of phosphorus and potassium fertilizer added, truly scientific formula. If you use ternary compound fertilizer for seedbed fertilizer must be appropriate. Fertilizer should be fully mixed, to achieve both the purpose of fertilizer and fertilizer. At the same time, little or no urea and ammonium bicarbonate should be applied to prevent the emergence of dead seedlings or cotton seedlings when the seedlings emerge, resulting in weakened disease resistance, undeveloped root systems, prolonged seedlings after transplanting, and failure to form a stiff seedling.
Do a good job of drying and seed selection
Before sowing, sunny seeds should be plucked and seeds must be selected. Through seed drying, seed dormancy can be broken and seed viability can be improved to facilitate seeding.
Effectively do a good job of soil disinfection
After the bed and soil are ready, prepare the pot in advance and disinfect it for the first time on the day before the pot-planting process. Add the water to the bed soil and mix and level the pot. When the pot is made, use 250 to 300 times liquid of methyl sulphate or five times. Chloronitrobenzene was diluted 300 times on the surface of the bed soil, or 150-200 grams of dextrox per acre was sprayed on the surface of the bed soil to disinfect it before the mash was made. In order to control the carp, carbofuran should be applied to prevent carp carcasses, and then agricultural film should be used to prevent rain from damaging carcasses. After the second disinfection at the time of sowing, 250-300 times of methyl legiesol was sprayed on the carcass and then sowed. After the sowing, the cover was covered with soil, and then the third disinfection was performed (the method is the same as above). Cover soil should not be used in the top soil of cotton fields, because there are a large number of pathogens in the topsoil. After emerged, it is necessary to prevent seedling disease such as blight and damping-off. At the same time drying the bed to dehumidify, deepen the roots to ensure that the cotton field is not infected by the disease.
Guaranteed timely sowing
As the saying goes, it was early in the morning and early in the morning, but it was late at the beginning of the summer. It is advisable to keep the temperature stable at 15°C or more during the sowing time, generally in the mid-April (8th to 20th) in the sunny morning. Do not sow in March. Because sowing is too early, the temperature and the ground temperature are very low. Cold currents are frequent. Although seedlings are easy to emerge, seedlings are difficult to maintain, and there will be a large number of dead seedlings and diseased seedlings, which will bring passive production throughout the year.
Focus on sowing quality
First, the sowing time farmers must pay attention to the weather forecast, when the sunny days began to sow more than 3 days. When sowing, we must sow the soil and cover the side of the membrane while disinfecting, so as to warm the seedbed. Do not sow on rainy days. After 4 o'clock in the afternoon, the temperature of the seedbed will not rise. It is best not to sow. Practice has proved that the same seed, the seedling emergence rate of sunny and cloudy sowing is not the same, the seedling rate after sowing in the morning and after 4 pm is not the same.
Second, we must adhere to the "two wet and dry" sowing that is wet, wet cover soil, dried seeds. To be planted after the first crop, can not be planted side of the forest, due to inconsistent water, inconsistent temperature, emergence is also inconsistent, can lead to cotton seedlings are not complete, uneven, inconvenient management.
Scientific management of a good seedbed
First, we must promptly open the ditch to pick up the bed to prevent seedbed watering seedbed from drying out and deepen the deep rooting of cotton seedlings, cultivate strong root groups, and increase resistance to disease. To really do long roots, hot roots, aerobic roots, strong root groups, to promote the early establishment of cotton seedlings.
Second, control the temperature inside the film to prevent burning seedlings before Qimiao must keep warm moisture, can not uncover the film. With double membrane coverage, when the seedling emergence rate reaches 70%, a layer of mulch film is removed at about 8 o'clock in the sunny morning. After Qimiao grab the sunny day to remove the film drying bed, spray a half-time Bordeaux fluid to prevent disease. After the seedlings have one true leaf, it is necessary to ensure that the temperature inside the film is between 20°C and 30°C, and two membranes should be opened to prevent high temperature burning.
Third, after the transplanting of seedlings and cotton seedlings has one true leaf, when the transplanted seedlings cannot be transplanted in time, the seedlings can be transplanted to promote root growth and shorten the seedling-reducing period.
Strong seedlings transplanted
When the seedling height is 10 to 12 centimeters, there are 3 to 4 true leaves; when the white root grows full, it can be transplanted to Daejeon with the medicine.
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