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The current vegetable greenhouse should pay attention to warming and heat preservation
In winter, the cold weather, coupled with the frequent impact of extreme weather such as continuous yin, rain, and snow, has led to a significant decrease in temperature in vegetable greenhouses, severely affecting the normal growth and development of vegetables in sheds, and individual strong cold weather will also make sheds The temperature dropped below 10°C. Over time, vegetables would be severely reduced or even eliminated. Several methods of warming and warming vegetable greenhouses are introduced as follows: First, cleaning and repair of greenhouse film The greenhouse film is not clean for a long time, it is easy to collect dust, and the light transmittance is reduced, which affects the heating effect in the greenhouse. Therefore, it is necessary to clean the greenhouse film frequently. Keep the membrane surface clean and increase the heating effect. In addition, on weekdays, it is necessary to carefully inspect the shed film, find damage, and timely repair with a new film, so that no leakage occurs. Second, covering the plastic film and covering the small shed covering the film, not only can prevent the evaporation of soil moisture inside the shed, but also can play a role in warming the soil insulation effect. When the winter is cold, in order to increase the temperature in the shed, a small arch can be placed on the shed. Third, add wind barriers and grass cover film in the cold season, but also by blocking the wind barrier on the two walls outside the greenhouse, back slope cover film and cover the grass in the evening cover film on the grass covered with 1 to 2 layers of film, etc. Measures to warm and maintain greenhouses. Fourth, the implementation of high-ridge cultivation, timely and appropriate amount of water in winter use of high-ridge cultivation, can increase the surface area of ​​heat absorption is conducive to raising the temperature and ensure the healthy growth of vegetables. The timely and proper watering can effectively coordinate the relationship among water, gas and heat in the soil. When watering the production, it is necessary to “three waters and three watersâ€, that is, watering on sunny days and not pouring on cloudy days; watering before noon and not pouring in the afternoon; pouring small water without pouring water. 5. Temperature-increasing facilities in the shed In order to prevent extreme temperatures in the shed, such as continuous yin, rain, and snow, from rapidly reducing the temperature in the shed, warming facilities such as a stove or charcoal basin can be provided in the shed, and if necessary, heating can be carried out. However, it must be guaranteed. The smoke can be discharged smoothly, otherwise it will have a toxic effect on vegetables. Six, set the storage tank and cold ditch Early production, in the greenhouse can be digging a reservoir at regular intervals, the bottom of the pool with plastic film, the cold weather before the pool filled with water, and then cover the upper part of the pool transparent film . Using the characteristic that the specific heat of water is relatively large, the water in the water storage tank can release the heat absorbed in sunny days at night and prevent the nighttime temperature in the shed from decreasing too quickly. It is also possible to dig a cold ditch with a depth of 40-60 cm and a width of 40-50 cm in the south of the greenhouse, fill in sawdust, weeds, horse dung, straw, and other insulation materials. Lost outward.