In the production of greenhouse vegetables in deep winter, there are often snow and haze weather, which brings great inconvenience to the production and management of greenhouse vegetables. The following describes the management measures for greenhouse vegetables under the conditions of snowy weather. 1. Stabilize the skeleton to prevent collapse After the snow stops, clear the greenhouse film and the surrounding snow in time. Especially in the case of sudden heavy snowfall at night, when the heat preservation quilt and the snow on the shed film exceed the maximum pressure that the shed frame can withstand, the shed will collapse. Therefore, in the event of heavy snow, the snow on the shed should be cleared in time. For some sheds with large spans, few or no columns, temporary columns must be added to support the arch in snowy weather to prevent problems. 2. Protect the grass thatch and increase the temperature Once the grass thatch is wetted by snow or dew, it will greatly reduce its cold resistance and heat preservation. Covering a layer of plastic film on the grass thatch can not only reduce the heat loss in the shed, but also prevent rain and snow from soaking the grass thatch and improve its heat preservation. In addition, due to thick clouds in the sky, the temperature is generally not very low on cloudy and snowy days. In order to protect the grass thatch, it is not necessary to cover the grass thatch on snowy days. After the snow stops, the snow on the shed is swept away, and the grass thatch is covered at night. In snowy weather, there is no direct light, and the temperature in the greenhouse will drop as the outside temperature drops. When encountering this kind of weather, the greenhouse should be temporarily heated, and the temperature in the greenhouse should be raised to about 15°C to prevent low temperature hazards. Do not heat the greenhouse with an open flame, set up a fire channel, and seal the interface of the fire channel tightly to prevent harmful gas from leaking into the shed and human gas poisoning. 3. Uncover the thatch normally and add light If the cloudy and snowy weather lasts for a long time, and the vegetable plants are not exposed to light for several days, they will be easily covered by yellow and infected, which will lead to death. For many days of cloudy and snowy weather, the temperature in the greenhouse drops very low. Once it is sunny and the sun shines on the film, the temperature in the greenhouse will rise rapidly, while the soil temperature rises relatively slowly. After the temperature rises, the transpiration of leaf water will also increase, but at this time the soil temperature is lower and the root water absorption is weak, so the plants are prone to wilting, which can lead to death in serious cases. Therefore, you should pay attention to returning to thatch in the weather with long overcast and sudden fine weather. First remove a few less, so that the indoor temperature rises slowly, and pay attention to the performance of the leaves. If the leaves are normal, gradually increase the number of uncovered thatch until all uncovered; if wilting is found, cover a few more grass thatch in time. Uncovering and returning the thatch may sometimes need to be repeated for 1 to 3 days. 4. Increase temperature to keep warm and prevent cold damage For temperature-loving vegetables such as tomatoes, cucumbers, eggplants, and green peppers, if the indoor temperature is below 10°C for a long time, the absorption capacity of the roots will be greatly reduced, or even stop growing, causing chilling damage. The plant stops growing, accompanied by the phenomenon of melon, fruit dropping, and fruit dropping, and the leaves turn yellow and the plant resistance decreases. For some greenhouses with thin walls, thin grass, and thin back slopes, cold damage is more likely to occur in snowy weather, and insulation must be done well. The temperature in the greenhouse can be increased by covering the heat preservation material at night, such as adding a heat preservation quilt, or lighting a stove, and supplementing light. 5. Strengthen cultivating, ventilation and dehumidification In the greenhouse vegetable production, the amount of base fertilizer used is relatively sufficient. In addition, the winter temperature is low and the plant growth is slow, so the fertilizer and water requirements are also small. The principles of no top dressing and less watering should be mastered in management. It is necessary to strengthen cultivating in order to increase the ground temperature and discharge the carbon dioxide and some harmful gases produced when the fertilizer is decomposed, so that fresh air can enter the soil and promote the growth and development of the root system. After uncovering the thatch in the morning, because the outdoor temperature is low, a lot of floating mist will form indoors. At this time, if the film is ventilated, the temperature in the greenhouse will drop sharply, which is not good for the growth of vegetables. Generally, the ventilation and dehumidification time of the film should be after the outside air temperature and indoor humidity have risen, a 15-20 cm wide slit should be opened from the roof of the shed, and closed after half an hour to increase the temperature and store heat. Use the same method to ventilate again 1 to 2 times around noon. Disclaimer: Some articles on this website are transferred from the Internet. 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Five points in greenhouse vegetable management in cloudy and snowy days