During the severe winter season, the temperature is relatively low, and greenhouses and flowers suffer from frost damage. Here are some ways to prevent freezing damage.

First, increase the cover. At night, grass stalks or corn stalks can be added around the greenhouse to increase the temperature by 1°C to 2°C. Adding a thin layer of wolfberry above the original grasshopper can increase the temperature of the shed by 2°C to 3°C. Covering the original grasshopper with a layer of film can not only block the wind, but also prevent the rain and snow from wetting the grasshopper, thereby reducing heat loss caused by evaporation of water.

Second, smoking smoke around the greenhouse. Before the arrival of the cold spell, smoking smoke around the greenhouse can prevent the heat around the greenhouse from radiating to high altitude and reduce heat loss.

Third, often cleaning the film. The dust, dirt and snow on the shed film can be removed in time to increase the light and increase the temperature of the shed.

Fourth, cover the film or small shed. Greenhouses are cultivated on high ridges and can be covered with a layer of plastic film on high ridges, generally increasing the ground temperature by 2°C to 3°C. For cultivating flat ridges, small sheds can be erected to increase the ground temperature.

V. Dig the cold ditch. Ditch the trench on the outer side of the outside of the greenhouse and fill in heat preservation materials such as horse dung, weeds, and straw to prevent the ground temperature from being dissipated and increase the temperature of the ground in the southern part of the greenhouse.

Sixth, double film cover. A further layer of film is placed underneath the drop-free film. Since there is air between the two films, the temperature inside the housing can be significantly increased.

VII. Use storage tank insulation. In the center of the greenhouse, a reservoir is dug every few meters. The bottom of the pool is covered with plastic film and then filled with fresh water. A transparent film is then placed on the upper part of the pool (to prevent evaporation of water in the pool and increase the humidity of the air in the greenhouse). Since the specific heat of water is large, it can absorb heat (at high temperatures) at noon and release heat at night.

Eight, timely uncover the grasshopper. When temperature conditions permit, cover the late cover as soon as possible to promote the photosynthesis of flowers. In deep winter season, sunny days generally expose the grass in the morning sunlight, and the temperature in the shed is generally not lower than 18°C. In cloudy or cloudy conditions, the light is weak, and grasshoppers should be uncovered in time to allow scattered light to enter. On the one hand, the temperature can be increased. On the other hand, there is more blue-violet light in scattered light, which is beneficial to photosynthesis. Avoid exposing grasshoppers for a long time, resulting in a cold inside the shed and a significant drop in temperature.

Nine, increase organic fertilizer. In the shed, horse dung, smashing grass and other brewing materials are applied to raise the temperature of the ground. Organic fertilizers release heat when they decompose.

X. Hang the light curtain. Hanging polyester aluminum film on the north side of the greenhouse can increase lighting in the shed and increase the temperature of the shed by 2°C to 3°C.

11. Increase the temperature by using fire or heating. In extremely cold weather, an additional stove or heating can be installed in the shed. However, when using the fire heating, care should be taken to prevent flower gas poisoning (installing chimneys to export gas outside the shed). Take care not to warm the firewood in the shed to increase the temperature, because the smoke emitted from the firewood is harmful to the flowers.

Twelve, planting ash on the ground. The gray ash of the plant is gray and black, and it has a strong heat absorption capacity. After spreading evenly on the ground, it can generally increase the ground temperature by 1°C to 2°C.

XIII. Spray antifreeze. Before cooling, spray the stems and leaves of the plant with 400-700 times of antifreeze to protect against freezing and freezing.

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