During the winter, some vegetable farmers did not open the haystack after an hour of sunrise in order to maintain the temperature in the greenhouse. However, it was too early for the haystacks in the afternoon, causing the vegetables in the shed to receive too little light. There are fewer photosynthetic products and lower yields. In the cloudy days, especially in the cloudy days, many vegetable farmers only consider the insulation of the greenhouse in winter, but do not take into account the astigmatism, ventilation, and dehumidification in cloudy weather. Often pick yellow vegetables.

The winter warm greenhouse has no cold-proof ditch and the winter temperature is relatively low. The soil about 2 meters in front of the greenhouse is in a low temperature state for a long time, which affects the normal growth of vegetables and there are more malformed fruits. The vegetable growers can dig a trench, one-meter long in the front of the shed, and the length of the greenhouse, half a meter wide, and the same depth as the local permafrost. The first layer of film is covered in the ditch and then filled with dry ones. Straw, so it can play a very good insulation effect. The winter warm sheds in the area between 34 and 39 degrees north latitude can be covered with grass rakes on the aisles in front of the shed.

Will not manage the death caused by flash death. A lot of vegetable farmers in the dark even after the sunny day to clear the grass in accordance with the usual sunny, this approach is wrong, can easily cause flashes of vegetables in the greenhouse, resulting in wilting dead tree phenomenon. Therefore, it is suggested that after the sunny days of continuous cloudy days, measures such as “disassociating and spraying warm water” can be used to prevent vegetables from flashing. That is to say, instead of uncovering the whole shed when exposing the grass, it is to open a bed one by one. After dismantling grasshoppers, the light in the shed illuminates a bed and exposes the vegetables corresponding to the grasshopper. The vegetables will be exposed to strong direct sunlight. Vegetables that have not been drafted will receive astigmatism and the vegetables will be brightly lit. In general, after 10 to 15 minutes of pulling the grasshopper, it will appear wilting phenomenon. At this time, it is necessary to spray the plants with warm water of about 20°C in time, and then lay down the grasshopper and reopen the grasshopper that was not uncovered the first time. For those vegetables that do not receive strong light, they also receive strong light, and then use the same method of spraying warm water to promote normal growth. This is repeated several times, usually after two hours in the afternoon, check the ground temperature in the shed, if the temperature reaches 20 °C, vegetables will not appear wilting symptoms after seeing light, then you can uncover the grasshopper. Wait until the next day to resume normal management after sunny days.

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