Cotton seedlings are the beginning of cotton production during the year and the basis for achieving stable and high yields of cotton. In recent years, Sheyang County's cotton seedlings have adopted a variety of methods such as “even sports seedlingsâ€, “two no-nothing†shed nursery, and “less soil nurseryâ€, but more than 95% of cotton farmers are still accustomed to “nutritional seedlingsâ€. ". Recently, the Sheyang County Cotton Association released the key points of cotton seedling cultivation techniques. First, choose a good seedbed. The selection of cotton nursery seedbeds should be close to transplanting the field. With leeward sunlight, convenient irrigation and drainage, and good soil-free disease-free plots, avoid using heavy bedsteads, and there should be a certain space around the seedbeds. Try to prevent the crops from affecting the illumination and ventilation of the seedbeds after the crops have started to joint. Second, fertilizer bed soil. In combination with seedlings, the spring broom will turn over, ripen the soil, fertilize the fertilizer, and cultivate bed soil. Seedbed fertilizer should be dominated by organic fertilizer supplemented with a small amount of phosphorus and potassium fertilizers. Normally, each standard seedbed (2 mu for transplanting seedlings in Daejeon Field) can be applied about 200 kg of decomposed livestock and human feces or fermented fines before 10 days before the start of production. 1-2 kilograms of bean cake, when the system is used, use 4-5 kg ​​of special fertilizer for seedbeds containing phosphorus and potassium fertilizers. All kinds of fertilizers and bed soil should be well-mixed, and remove coarse hard debris. The thickness of the fertilizing soil layer should not be less than 15cm, so that there is sufficient nutrient soil to meet the fertilizer requirements for the growth of the bed and cover seed and the emergence of cotton seedlings in the bed. Third, early warning system. Sheyang is located on the coast, and the early spring air changes rapidly. Each cultivator needs to follow the general requirements for completing the smashing task by the end of March. Based on the size of their cotton planting area and the physical strength of the laborers, the time for starting smashing is determined. However, in order to prevent changes in the weather from affecting the system, it should be appropriately advanced. 1, pay attention to the quality of the system. The quality of carcass quality directly affects the consistency of the emergence of cotton and the emergence rate and the cultivation of big and strong seedlings. Therefore, when making a bed system, it is necessary to use a 7-cm-diameter and 10-cm-empty height-keeping device, and to make the bottom of the bed smooth and evenly distributed water (by hand, forming a group, and chest-to-floor fall-off is appropriate). Highly consistent, neat and tidy. 2, the number of foot carcass. In order to better exert the group's advantages in the growth and development of cotton and achieve the goal of stable production and high yield, the average density of transplanting in Daejeon County should be controlled at about 1,700 strains, according to the final effective utilization rate of nutrient glycosides in recent years. The quantity should be increased by about 80% compared with the actual planting density in Daejeon, that is, the general insect-resistant hybrid cotton should contain no less than 3200 per mu. 3, timely management of the trampoline. After the system is finished, soil around the boring machine must be fenced to make a bed. The bed height is generally slightly higher than the squat surface, and three sewers are pre-drilled around the bed to raise the bed base. The remaining fine soil of the system is piled up on the bed and covered with a film to prevent damage to the trampoline due to rain and rain, and the loss or increase or decrease of moisture in the cover soil. It is fully prepared for sowing. Fourth, fine sowing. The early sowing of seeds, the quality of the high and low is the key to the cultivation of early and strong seedlings. 1, choose drying cotton species. The cotton varieties of the county are mainly based on insect-resistant hybrid cotton. The quality of seeds sold on the market is marked, and the germination rate is generally about 75%. The actual germination rate of a few alternate years will be lower. In this regard, it is recommended that cotton farmers must look at the date of production of the cotton seed when purchasing the seed and avoid purchasing it. At the same time, in order to enhance the germination potential and increase the seedling emergence rate, the cotton seeds were sorted before sowing to remove broken seeds and pod seeds, and used the fine weather to dry the seeds 2-3 times to promote the ripening of seeds and enhance seed vigor. 2, suitable for sowing. To pay attention to the weather forecast, at the end of March, before and after the “Qingmingâ€, when the temperature stabilized at 8°C and a clear weather process lasted for more than 3 days, sudden seeding was performed. When planting seeds, adhere to the seeds and seeds of the dried seeds and plant them one at a time to prevent missed sowing. Cover the seeds with 1.5cm or so, and strive to broadcast the whole seedlings. 3, drying water. Before planting the boring machine, select sunny weather and uncover the sun. In this way, it can not only increase the temperature of the carcass and increase the temperature of the carcass, but also can make the carcass knot and facilitate the reduction of carcass defects when watering. The body watering should be done in a sufficient and uniform manner, and the water should be poured in advance at the end of the water. It is advisable to see the water between the carcasses. After the water is dried, the water is used for secondary watering. It is advisable to poke lightly without any hindrance. 4, spray coating. Cover the soil with a special herbicide spray bed evenly to prevent weeds. After flat-covering with a plastic film, the scaffolding is covered and the agricultural film is covered. The brackets are spaced 60 centimeters apart, and the hollow space is about 40 centimeters. The brackets are connected by plastic ropes and piling at both ends. In order to increase the utilization rate of the seedlings at the side, a small arch can be erected at the edge of the seedbed. Finally cover the agricultural film, the film should be tightly sealed, and pull the safety rope to prevent wind and film. 5, rationale bed ditch. After coating, timely drain the drains around the seedbed and open the outlets so that the water can be discharged to prevent the seedbeds from getting stains and reduce the occurrence of disease at the seedling stage. Fifth, seedbed management. Seedbed management is the core of nurturing strong seedlings. According to the experience accumulated by the County Crop Cultivation Technique Guidance Station for many years, the following measures should be taken care of: 1, filming. To promptly check the germination and seedling emergence of the seedbed, use a double film nursery seedling bed, after about 40% of cotton seedling top soil, use clear weather to extract the plastic film. 2, drying bed. In the seedling rear view seed bed temperature to expose the film to the sun drying bed, usually about 80% of the seedlings will have to pay close attention to, drying time at about 10 o'clock in the morning, the first ventilation, after the film. At about 3 pm, the film is kept warm, and it is usually dried for 2-3 days until the bed is whitish. This is a key technology to prevent disease and promote strong seedlings. 3, temperature adjustment. After the drying of the bed, only the ventilation and uncovered film and the uncovered film were used to adjust the temperature and promote the strong measures. The ventilation began to be delayed and early clearance was required. Generally, the ventilation openings were opened at approximately 10:00 and the bed was closed at approximately 4:00. Afterwards, it is necessary to gradually increase the number of vents, and constantly change the position of the vents. Adjust the temperature of the seedbed from beginning to end so as not to cause prolonged seedlings and lean seedlings, which is not conducive to the formation of strong seedlings. 4, to promote strong. Based on the use of temperature-regulating and dehumidifying measures, the use of strong seedlings should be well-studied. Spraying is generally performed once in the first leaf stage to ensure strong seedlings. Contains conditioners that can be used without or postponed. 5, hardening seedlings. One week before transplanting, the day-to-night cover gradually transitioned to the process of day and night uncovering the film, but the film did not leave the field to prevent severe natural disasters. The seedlings were smelted to “half the red stem, white roots, and dark green leaves. "Miao body piers" requirements. 6, disease prevention and pest control. Mainly in combination with uncovered sun drying bed after seedlings, special disease-preventing agents for seedlings are used for disease prevention and seedling protection. Ventilation and hardening seedlings are used in the middle and late stages of seedbed management, insecticides are controlled with pest control agents, and the rate of seedling growth is increased, and efforts are made to strive for strong growth. Seedlings and foot transplants.