Expert opinion: How to protect greenhouses safely in winter
Just after the New Year, most of the northern regions of our country suffered from severe cold and snowfall. Some vegetables and fruits in greenhouses suffered freezing damage and suffered serious losses. How to make winter greenhouses safe for winter? In this regard, experts from the Agricultural and Animal Husbandry Bureau of Chifeng City, Inner Mongolia Autonomous Region, have had good expenses. Experts say that when there are a lot of vegetable farmers who do not pull straws when they encounter cloudy weather, if the outside temperature is not very low on cloudy days, they should unveil the grasshoppers, because crops can use photons with scattered light. If the sky is exposed for a short time on a cloudy day, the temperature of the greenhouse can also be raised. Using multi-layer covering technology, for the greenhouse with poor heat insulation, a small arch shed can be added in the greenhouse, covered with a film outside the arch, and a layer of film can be covered 20 cm below the greenhouse to form an insulation layer. At the same time, it is also possible to add a layer of plastic film in the small arch shed and form a four-layer cover in the greenhouse. When encountering cloudy days, increasing the lighting in the booth is the key way to increase production. One is to promote fluorescent lighting technology. Generally 20-25 baht per acre. Turning on the lights in the morning and evening on cloudy days adds light to the vegetables and extends them for 3-4 hours. Together with the sunlight, the light can be formed for 15-18 hours per day, which can increase the yield by 10%-40% and shorten the vegetative growth period by 17-21 days. The second is a light curtain on the back wall of the greenhouse, which can increase the light intensity of rear vegetable cultivation. In the evening, the heat energy stored in the wall can be slowly released into the room, which can maintain a higher temperature in the middle of the night to prevent freezing and damage of the seedlings. Experts say that cold and cold temperatures often occur in winter, especially when there are several consecutive low-temperature and cloudy days. Canopies are not exposed in the greenhouses, and cold weather is used to cool the weather. The crops in the shed can be chilled. If this happens, put a stove in the shed and warm it manually. Such as stoves, charcoal pots, hot stoves, Yuba, electric stoves, etc. can be warmed antifreeze. However, the use of stoves and other heating is prone to smoke damage, and the sudden dehydration and flashing of plants caused by hot and cold, must pay attention.
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