How to sterilize and disinfect with the method of high temperature and stuffy shed?

How to sterilize and disinfect with the method of high temperature and stuffy shed? Please introduce the method of high temperature greenhouse disinfection, that is, in the closed greenhouse in summer, the high temperature of the sun and drug fumigation are used to disinfect the greenhouse, usually from early July to late August. This method has the advantages of low cost, low pollution, simple operation, good effect and easy to be accepted by the masses. The specific methods are as follows: first, soil preparation and fertilization: the land should be leveled and fine, and combined with soil preparation and fertilization, in order to kill germs in organic fertilizer. Some organic fertilizers, such as chicken manure, dried cow manure, etc., as well as improving the soil temperature and maintaining the ground temperature, make the germicidal effect better. After the land is ready, ridging or making a high and low border according to the planting mode of the crops, which can form a small space between the plastic film and the ground, which is helpful to improve the ground temperature. Second, irrigation: the soil water content is closely related to the germicidal efficacy, if the soil water content is too high, it is disadvantageous to improve the ground temperature; if the soil water content is too low, it can not achieve a better germicidal effect. Practice has proved that when the soil water content reaches 60% of the maximum field capacity, the effect is the best. Third, drug treatment: disinfect the soil covered with plastic film with chloropicrin to kill the germs in the soil. The method is to inject chlorinated bitter into the border, 50 square centimeters to dig a hole, a depth of 10 to 15 centimeters, 4 milliliters per hole. In addition, before the airtight greenhouse, the inner surface of the shed was sprayed with fungicides and insecticides to kill germs and pests hiding in the cracks in the wall. Fourth, closed greenhouse: double-layer covering with greenhouse film and plastic film to strictly maintain the tightness of the greenhouse. Under such conditions, the highest ground temperature at 10 cm below the surface can reach 70 ℃, and the ground temperature at 20 cm can reach more than 45 ℃. Disinfection time: most bacteria are not resistant to high temperature and can be killed after a short period of heat treatment (about 10 days), such as some Rhizoctonia solani, Sclerotinia sclerotiorum of cucumber, cucumber blight, eggplant Verticillium wilt and so on. However, some bacteria are particularly resistant to high temperature, such as root rot, root swelling, Fusarium wilt and other deep root soil infectious bacteria, because of their deep soil layer, they must be treated for 30 to 50 days to achieve better results. Therefore, when carrying out soil disinfection, the disinfection time should be determined according to the heat resistance of the crops grown in the greenhouse and their corresponding bacteria. 6. Post-disinfection treatment: solar heat disinfection has the best effect on soil not more than 15 cm deep, and poor disinfection effect on soil more than 20 cm deep. Therefore, it is best not to plough the soil after disinfection, even if ploughing should be limited to a depth of 10 cm. Otherwise, the germs in the soil below will be turned over again, resulting in re-pollution. Although the solar thermal disinfection method can not completely sterilize the greenhouse, it can greatly reduce the density of germs in the field and greatly reduce the chance of crop disease, and its disinfection effect can last for 2 years, so the greenhouse can be sterilized once every two years. Click to get more fungicide use technology click to get more pesticide use technology