Cotton seedling cultivation is an important measure to win high yields. Cotton planting areas are always inevitably caused by the improper management of sprouting rotten species dead seedlings phenomenon, the dead seedling rate of 17.5% -28% or so, the seedbed management slightly missed, that led to high temperature burning seedlings, some predecessors to abandon, so after sowing Grasp seedbed management is the key to improving the seedling rate. In the cotton producing areas, cotton rotten bells occur differently every year. In general, the annual output loss is 5-10%. The loss of the cotton fields in the more rainy years and the more prosperous cotton plants are more serious. Some of the deadlocked cotton accounts for almost 1/4 of the total harvest. Therefore, we should pay enough attention to take timely measures to actively prevent it. Before emergence, high temperature and high humidity are required to promote seedlings. Water is the main contradiction. Seedlings of thin film nursery have high temperature and consume large amounts of water. Cottonseeds must absorb enough water by 80% to germinate and produce seedlings. Water in the seedbed is too low, and seeds cannot Germination, lack of moisture, germinating seeds will also bud down. The key to pre-emergence seedbed management is based on the three-wet sowing. It is necessary to tightly cover the membrane to maintain high temperature and high humidity, and avoid removing the membrane within one week. Under the conditions of high temperature and suitable moisture, the whole film can be obtained in one week. However, if the temperature in the film exceeds 35°C, two or more parts can be opened to cool the air and prevent burning, but the time cannot be too long. After 1-2 hours, it is sealed. After emergence, medium temperature and low humidity are required to promote strong seedlings. Temperature is the main contradiction. After the emergence of cotton, the roots are fastened under the roots and the absorption capacity is enhanced. The requirement for water is no longer as urgent as when the top soil emerges. Many, not only take root, but also because of the low temperature and high humidity environment, the breeding of pathogenic bacteria, resulting in the phenomenon of disease, dead seedlings and tall seedlings, so, should be mainly scattered moisture, medium temperature. In terms of water management, the soil surface of the seedbed is not whitened and the temperature becomes the main contradiction. Freshly emerged cotton seedlings should be protected against low-temperature frostbite. The bed temperature should be controlled at 20°C-25°C. If the temperature is low, the film should be closed. As the temperature changes at this time, when the weather is cold, the weather is hot and cold, the wind suddenly changes, the temperature difference changes greatly, it is necessary to prevent freezing and frostbite, but also to prevent high temperature burns. When the bed temperature exceeds 30°C, multiple slow exposures should be taken depending on the situation. Membrane opening. Before transplanting, it is necessary to remove the film and smash the seedlings day and night. Light and fertilizer are the main contradictions. During the period from the second leaf to the transplanting stage, it is necessary to grasp the principle of “lowering in temperature and promote the development of hairâ€. Ventilation and temperature adjustment should be carried out in the early stage, and the bed temperature should be controlled at 20. About °C, sunny days at 7-8 o'clock in the morning ventilation, gradually increase the vents or semi-unwound film at noon, the latter should be properly lift film hardening seedlings, about a week before transplanting, do not cover the film day and night, cultivate healthy seedlings, smelt to the red stem More than half, white root plate, dark green leaves, seedlings thick and solid. Before the transplanting, the film can not be taken away to prevent a sudden attack of low-temperature cold waves, but it is still necessary to cover the film to prevent freezing. 6-7 days before transplanting, 4-5 kg ​​of urea should be topdressed per acre seedbed to be used as a “fertility fertilizerâ€, so that after the transplanting, the cotton seedlings will soon develop new roots and promote strong seedlings early. In addition, during the entire period of seedbed management, it is necessary to do time and seedling weeding to see seedlings balance fertilizer, timely fight drugs to prevent diseases and insect pests, so as to ensure cotton seedlings full, uniform, homogeneous and strong. If the temperature is high, the seedlings have a long growth phenomenon, but also use 0.5-1 grams of dilute amine to 50 kilograms of water, spraying to inhibit growth and prevent the occurrence of high-foliar seedlings.
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