Low-temperature freezers have obvious effects on reducing the number of pathogenic bacteria in arch sheds and improving soil conditions, especially for root-knot nematodes and other pathogens that are not tolerant to low temperatures. Low temperature in winter can well inhibit their survival and reduce their hazards. At present, just use low-temperature conditions to do a good job of the frozen shed. The specific method of freezing sheds in winter: First, remove the vegetables from the upper leaves and clean up the garden in time. Then remove the old film, if you are covering a new film, just open the vents on both sides, the bigger the better. Plunge the soil about 30 centimeters deep. Be careful not to crush the clods. The bigger the soil gap is, the better the effect will be, and then freeze naturally. About 1 month after freezing, the greenhouse film was covered 15 to 20 days before the planting of spring eel, which increased the temperature in the greenhouse and created a suitable microclimate environment. Medical Splash-proof Isolation Mask Face Shield,Medical Isolation Mask,Splash Proof Isolation Mask,Protective Isolation Face Shield GUANGDONG JIANGMEN RONGHAI MEDICAL TECHNOLOGY CO.,LTD , https://www.kimaomedical.com