High-temperature stuffy shed disinfection method is to close the greenhouse in summer, use the high temperature of the sun and the fumigation of drugs to carry out shed disinfection, generally from early July to late August. This method has low cost, low pollution, simple operation, good effect and easy acceptance by the public. The specific method is as follows: First, the preparation of fertilization: the ground to leveling, fine, and combined with soil fertigation to kill the bacteria in the organic fertilizer. Some organic fertilizers such as chicken manure and dried cow dung, as well as the effect of raising the ground temperature and maintaining the ground temperature, make the sterilization effect better. After the land is well-grounded, it can be ridged or made up and down according to the planting pattern of the crop, so that a small space can be formed between the mulch and the ground, which is conducive to raising the ground temperature. 2. Irrigation: The water content of the soil is closely related to the bactericidal effect. If the soil moisture content is too high, it is unfavorable to increase the ground temperature; if the soil moisture content is too low, it will not achieve a good bactericidal effect. Practice has proved that the best results are obtained when the soil moisture content reaches 60% of the maximum water holding capacity in the field. Third, drug treatment: with chloropicrin to cover the soil mulching to kill the bacteria in the soil. Method is to chlorinated bitter into the scorpion, 50 cm2 dig a hole, the depth of 10 to 15 cm, 4 ml per hole. In addition, before sealing the greenhouse, the shed's body surface was sprayed with bactericide and insecticide once to kill pathogens and pests hiding in the wall joints. IV. Closed greenhouses: Use double-layer covering with greenhouse membranes and plastic membranes to strictly maintain the tightness of greenhouses. Under such conditions, the maximum ground temperature at 10 cm below the surface can reach 70°C, and the ground temperature at 20 cm can reach 45°C or higher. This high ground temperature sterilization rate can reach more than 80%. V. Disinfection time: Most pathogens are not resistant to high temperatures and can be killed after a short period of heat treatment (about 10 days), such as some bacterial pathogens, cucumber sclerotinia, cucumber pathogens, eggplant yellow Wilt germs, etc. However, some bacteria are particularly resistant to high temperatures. Some deep-rooted soil-borne bacteria such as root rot pathogens, clubroots, and fusarium wilt pathogens must be treated for 30-50 days to achieve good results because of their deep soil distribution. Therefore, when the soil is disinfected, the disinfection time should be determined according to the heat resistance of the crops and their corresponding pathogens in the shed. 6. Disinfection after treatment: Solar thermal disinfection works best for soils no more than 15 cm deep, and has poor soil disinfection effect for soils over 20 cm deep. Therefore, it is best not to plough the soil after soil disinfection, even if the soil is ploughed. Limit to a depth of 10 cm. Otherwise, the bacteria in the soil below will be reverted and recontamination will occur. Although the solar thermal disinfection method can not completely sterilize the greenhouse, but it can significantly reduce the density of bacteria in the field, greatly reducing the incidence of crop disease, the disinfection effect can last for 2 years, so the greenhouse can be disinfected once a year.
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