Cabbage from the sowing to grow to 7 to 8 true leaves for the seedling period, the approximate time is 20 to 25 days. As the cabbage seedling stage is a season of high temperature and rain, there are many pests and the seedlings are susceptible to viral diseases. Therefore, strengthening seedling management is the key to stable yield and high yield of Chinese cabbage. Specific management measures are: First, planting seedlings. Generally 3 days after seeding, the seedlings were planted for the first time between 7 and 8 days, and the seedlings were 6 to 7 centimeters in length. When the leaves were 4 to 5, the second seedlings were made and the seedlings were 10 to 12 centimeters apart. According to different species, the group trees are planted or planted according to a certain plant spacing, and the seedlings are planted in the seedling stage to replace the weak seedlings and diseased seedlings. Second, small water pouring. Although the amount of water needed during the seedling stage is not large, but the temperature is high, the ground water is poured, and the soil is kept moist, which can reduce the risk of high temperature and reduce the infection rate of virus at the bottom. When there is little rain during the seedling stage, use the gap and time seedlings to stop the rain, increase the amount of seedlings, and apply 3 to 4 kg of urea per mu. Third, cultivating fertilization. If seedlings in the field are not growing neatly after seedlings, they may be poured 2 to 3 times of 200 to 300 times of urea water for weakly growing seedlings, prompting the weak seedlings to grow quickly. Seedlings are ploughed once during the seedling stage and soil is cultivated around the seedlings. In combination with watering, a priming and one-time fat fertilizer are applied, and 5 to 6 kg of urea is applied per mu. Fourth, timely prevention and control of pests and diseases. The main diseases and pests that injure cabbage during the seedling stage are virus diseases, aphids, cabbage caterpillars, and cockroaches. The seedling stage not only directly harms Chinese cabbage, but also easily spreads viral diseases. It should be prevented and treated as soon as possible. Dental X-Ray Products,Portable Dental X-Ray Products,High-Frequency Dental X-Ray Products,Portable Dental X-Ray Ningbo Cland Medical Instruments Co., Ltd. , https://www.ruipumedical.com