High temperature disinfection of leisure sheds

In the greenhouse cultivation of greenhouses, in order to improve the utilization rate of the greenhouse and the economic benefits of production, continuous cropping and heavy cropping are inevitable. After several years of continuous use of the shed, the variety of indoor pests and diseases will be more and more serious, and the damage will become more and more serious, especially the soil-borne diseases, the incidence and harmfulness will be significantly improved, seriously affecting the yield of greenhouse vegetables. quality. Therefore, in the leisure period of the shed, the use of high temperature in summer for soil disinfection is a simple, cost-effective method.
First, the disinfection time is generally in the hot climate of June to August, when the sun is sufficient, the temperature is higher, the disinfection effect is best.
Second, the operation method After the harvest of the vegetables in the shed, the crop plants and production of hanging wire, bamboo rafts, waste film, etc. are thoroughly cleaned up. The soil in the shed is turned 30-40 cm deep to make a ridge 30 cm high and 60 cm wide to increase the heat absorption area of ​​the soil. The ridge faces north and south, which is good for the absorption of light and heat. Watering the water to ensure heat transfer. The shed is covered with a mulch film, and the mulch film is tightly compacted, and the film and the film are connected to each other without leaving a gap. Scavenge debris such as grass clippings on the shed film, and wipe the shed film with a clean cloth strip, cotton thread, etc. Close all vents in the shed. If the weather is fine and the sun is sufficient, the temperature in the shed can reach 50-60 °C in 2-3 days, and it will remain in a closed high temperature state for about 30 days.
In order to improve soil fertility, at the same time as deep turning, farmyard manure can be applied to accelerate the decomposition and transformation of organic fertilizer through high temperature action, especially the decomposition and transformation of under-fertilized fertilizer. At the same time, add appropriate amount of quicklime, use the alkaline of quicklime to neutralize the organic acid produced by the decay of organic matter, and maintain the acid-base balance of the soil.
Third, the disinfection effect after high temperature disinfection, can effectively reduce the sclerotinia, blight, blight, virus disease, root knot nematode disease, red spider and other pests and diseases, can also kill a lot of weeds, reduce grass damage.
Source: Hebei Daily Rural Edition

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