1, add cover. In the evening, small sheds should be placed inside the greenhouse and covered with straw curtains. At night, grass or corn stover can be added around the greenhouse to increase the temperature by 1°C to 2°C. Adding a thin layer of earthworm to the original grasshopper can increase the shelf temperature 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. 2, clean 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. 3, cover the film or small shed. Greenhouses cultivated on high ridges can be covered with a layer of mulch on high ridges, which generally can increase the ground temperature by 2°C to 3°C; for flat hoe cultivation, small sheds can be erected to raise the ground temperature. 4, 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. 5, timely disclosure. When temperature conditions permit, cover the late cover as soon as possible to promote the photosynthesis of flowers. In the winter season, when sunny days flood the entire shed in the morning, the weather 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 are 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. 6, warmer heating. In case of extremely cold weather, stoves or heating can be added in the shed. However, when using the fire heating, care should be taken to prevent flower gas poisoning. The chimney should be installed outside the shed to prevent the fire from heating. The fumes emitted when the firewood is burning have great harm to the flowers. 7, spray antifreeze. Before cooling, spray the stems and leaves of the plant with 400 to 700 times of antifreeze to protect against freezing and freezing. Sweetener Aspartame,Sweetener For Food,Food Ingredients Aspartame,Sweeteners In Food Additives CHANGZHOU GUANGHUI FOOD INGREDIENTS CO.,LTD , https://www.gsweetfood.com