Autumn and winter leeks are generally sown in late July to mid-August, and are planted from the end of August to the beginning of September. The management points after planting are introduced as follows for reference. After planting, plunge 1 to 2 times with appropriate seedlings, and weeding and weeding 3 to 4 times for seedlings. After 7 to 10 days, the weather turns cold. Cauliflower grows into a vigorous growth period, and water and fertilizer are required to promote, combined with watering, Mu recovery and urea. 15 kilograms or mature manure 800 to 1000 kilograms, alternating application, a total of 2 to 3 times, after the shed is no longer top dressing. Watering to keep the soil moist, especially in the vigorous growth period of leaves and flower bud hypertrophy period, can not lack of water, generally 5 to 7 days, 1 water, after mid-October, the temperature gradually decreases, to control the amount of water and watering . Before mid-October, scaffolding was prepared and a plastic film (preferably without a drip film) was prepared. In late October, the shed was covered. Before and after the start of winter, it is stamped with grasshoppers. In order to meet the water requirement during the entire shed period, the shed is poured with water 1 time before it is no longer watered. The key to post-stamp management is temperature and air humidity. With high temperature and high humidity, not only the plants are prone to infection, but also they have small balls, low yield, and poor quality. Therefore, at the beginning of the shed, it is necessary to grasp the large ventilation measures for early opening and closing of the estuary. With the gradual decrease in the outside temperature, the ventilation time and ventilation volume should be reduced accordingly. Generally, when the temperature in the shed reaches 15°C, the air is released and the temperature of the shed is controlled. After more than 25°C, ventilation is gradually reduced in the afternoon and the air outlet is closed when the temperature of the shed is lowered to 15°C. If it is cold or cloudy, it is necessary to expose the grass cover early, without ventilation or with less ventilation. Generally harvested at the end of November to early December, should not be delayed so as to avoid freezing damage. Disposable Breathing Mask,Disposable Face Mask,Easy Breathing Face Mask,Medical Sterile Surgical Face Masks Shaoxing Weijian Medical Supplies Co.,Ltd. , https://www.wetourmedical.com