1. Drying and frying. The seedlings of the river, such as sand and other culture medium, are sown on the concrete floor before sowing that the sun can be exposed to the sun for two to three days to kill bacteria and eggs. 2. Formalin disinfection method. Each cubic meter of culture soil was sprayed with 40% formalin 50 times 400-500 ml, and was evenly heaped and sealed with a plastic film for 48 hours. 3. Carbon dioxide disinfection method. The culture soil is piled into cones or rectangles, and several holes are inserted at a certain distance. Every cubic meter of culture soil is injected into the holes with 3.5 g of carbon dioxide, and then the soil is used to plug the hole, and then the film is used to cover and seal boredom for 48 to 72 hours. 4. Chlorinated chlorination method. The culture soil is made into blocks of 30 to 40 cm in height, and the spacing is 20 cm. A hole of 20 cm deep is punched with wooden sticks. Each hole is filled with 5 ml of chloropicrin. Sealed with soil, then watered, and then covered tightly with the film. 15 to 20 days, the film was repeatedly mixed and sterilized. 5. Potassium permanganate disinfection method. Sowing seedlings on the seedling bed, after soaking in a bed, soiling with 0.1% to 0.5% potassium permanganate solution, covering the soil with a film for 2 to 3 days, removing the film and then re-soaking and cutting Can kill bacteria in the soil and prevent rot and blight. Guangzhou Zhongzhinan Supply Chain Co.,Ltd. , https://www.gzzhongzhinan.com