Soil disinfection reduction method to the flooded state is allowed to contain a dilute aqueous solution of ethanol in the soil, soil disinfection by holding while suppressing the evaporation of water and ethanol. Reducing soil disinfectant consisting of an aqueous ethanol solution. Soil wetting disinfection method and wet and allowed to contain a dilute aqueous solution of ethanol in the soil, soil disinfection by holding while suppressing the evaporation of water and ethanol. Soil wetting disinfection agent consisting of an aqueous ethanol solution. soil disinfectants irrigation system including a water supply pipe having one end connected to a water supply, connected to the irrigation tube inlet and the other end, a liquid fertilizer mixing device, ethanol and water reservoir, and irrigation tube many branched. Reducing soil disinfection method using a combination of acetic acid, reducing soil disinfectant, soil wetting method of disinfection, soil wetting disinfectant, disinfectant soil irrigation system.
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