At present, in order to reduce the occurrence of frost damage in the shed, management of thermal insulation in the shed should be strengthened. 1. Film-covered warming: greenhouse crops such as greenhouse solanaceous fruit and strawberry should be covered with “four membranes†for thermal insulation, that is, mulch film, small arch film, inner film and large film. Generally, three layers of membranes are covered after transplanting. However, some farmers may suffer cold damage due to cooling when they are too late to cover the endometrium. Therefore, how to cover the four membranes in time before cold current intrusion is a problem that farmers need to pay attention to. In the case of extremely low temperatures, non-woven fabrics, old films, and other warming materials can also be placed on the small arch film to increase straw insulation on the inside of the apron film. At the entrance to the two sheds, a few membranes should be added around the door to prevent the cold wind from directly pouring in when the door is opened. This will act as a wind shield. Damage to the hole in the film can not be taken lightly, to repair in time. Intelligent greenhouses or multi-story greenhouses used for vegetable nursery shall promptly activate all warming facilities to warm and keep warm, and strengthen the anti-freezing ability of crops. 2. To strengthen management: take measures to keep warm and keep warm, but also according to weather conditions in a timely manner to remove film ventilation, reasonable adjustment of temperature and humidity. Because the four-layer film cover weakens the light intensity, so when the temperature rises at about 10 o'clock in the sunny day, the film must be opened and the door opened to increase the light. This will not only promote plant growth, but also reduce the incidence of plants. Generally, it is necessary to cover the greenhouse film and the small arch film before two o'clock in the afternoon. In the case of low temperature in cloudy weather, the film can be properly removed, but it should be noted that the film removal rate should not be too large and the time should not be too long. When diseases occur in the shed crops, the control agent may preferentially consider the type of fumigant, dust agent, etc. to avoid the cooling effect of the water agent. 3. Addition of organic fertilizer: The application of organic fertilizer can promote the cold resistance of the plant, and also has a certain temperature-increasing effect on the soil of the root of the plant. At the same time can also be applied outside the root fertilizer, the use of 0.2% ~ 0.3% potassium dihydrogen phosphate solution on the greenhouse vegetable spraying, can also play a role in supplementing plant nutrition, enhance cold resistance.
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