What medicine is used for soil sterilization in greenhouse?

In July and August, the soil was disinfected by direct sunlight for a long time and high temperature. The specific method is as follows: mix the toxic soil with the pesticide "39 1 1" (potassium mixed with phosphorus) and spread it evenly in the shed. At the same time, sprinkle 30-60 kg of quicklime per mu, dig deeply, and prepare soil 60-70 cm wide and 30 cm high. This is mainly to increase the surface area of the ground, make the ground temperature rise rapidly, and fill the ditch with water until it is saturated. The film cover of the greenhouse is sealed for more than 7 days (7 days in sunny days and longer in rainy days). With this method, the surface temperature can reach above 80℃, and general pests and diseases can be killed. In this disinfection method, due to the high temperature in the shed, the heat-resistant items in the shed should be removed from the shed. At the same time, when applying fertilizer in the shed, try to apply decomposed farmyard manure, because there are many pests and bacteria in the original fertilizer that are unfavorable to crop growth.

Precautions: When soil is disinfected, you must pay attention to safety. Before use, you must master the use of pesticides. You can't stay in a closed greenhouse for a long time. It is forbidden to engage in agricultural farming during ventilation.