Steady skeleton to prevent collapse
After the snow stopped, the snow on and around the greenhouse greenhouse film should be promptly removed. In particular, heavy nightfalls are encountered during nightfall. When the insulation is covered by snow and the snow on the shed film exceeds the maximum pressure of the shed frame, the sheds are often collapsed. Therefore, in the event of heavy snowfall, the snow on the shed must be cleared in time, and sweeping can be done underneath. For some sheds with large spans and few pillars or pillars, temporary pillars must be added to support the arches on snow days.
Protect grasshoppers and increase temperature
Once the grasshopper is wet with snow, it will greatly reduce its cold insulation. Covering the grasshoppers with a plastic film can reduce the heat loss in the shed and prevent the rain and snow from soaking the grasshoppers and improve their insulation. In addition, cloudy snow days, due to the thick clouds in the sky, the temperature is generally not very low. In order to protect the grasshoppers, it is not necessary to cover the grass in the snowy days. After the snow stops, the snow on the sheds will be cleaned and the grass will be covered at night. There is no direct light in cloudy snow, and the temperature in the greenhouse will decrease as the outside temperature drops. In the event of such weather, the greenhouse shall be temporarily warmed, and the temperature in the greenhouse shall be raised to about 15°C to prevent the cold temperature. Do not heat the greenhouse in an open flame. Set the fire path and the interface of the fire path to be sealed to prevent harmful gases from leaking into the shed and gas poisoning.
Normal exposure, supplemental lighting
If the cloudy snow weather lasts for a long time, the vegetables will not be exposed to light for many days, and they will easily become infected with “yellowish yellowâ€, resulting in death. In snowy days, the temperature in the greenhouse drops very low. Once it is sunny, the sun shines on the greenhouse film, and the temperature in the greenhouse rises rapidly, and the soil temperature rises relatively slowly. After the temperature rises, the transpiration of the leaf water also accelerates. At this time, the soil temperature is low and the water absorption capacity of the roots is weak, so the plants are prone to wilting. Therefore, we should pay attention to the weather when we encounter a long and sunny weather. The first few to expose a few, make the indoor temperature rise slowly, and observe the performance of the blade. If the leaves are normal, then gradually increase the number of exposing them until they are all uncovered; if any wilting phenomenon is found, promptly cover a few grasshoppers. Sometimes it takes 1 to 3 days to expose and recall.
Increase warmth and prevent cold damage
For thermophilic vegetables such as tomatoes, cucumbers, eggplants, and green peppers, if the temperature in the greenhouse is lower than 10°C for a long time, the root absorption capacity will be greatly reduced, and even the growth will stop, causing cold damage. Plants stopped growing, accompanied by melons, falling fruit, and fruit drop, yellowing leaves, and reduced plant resistance. For some greenhouses with thin walls, thin grasshoppers and thin slopes, it is more likely that cold weather will occur in cloudy and snowy weather. The temperature in the greenhouse can be increased by covering the insulation at night, such as by covering the insulation or by producing a stove.
Strengthen cultivator, ventilation and humidity
Greenhouse vegetables are generally rich in base fertilizers, coupled with low winter temperatures and slow plant growth, so the amount of fertilizer needed and the amount of water required are also less. In management, the principle of not top-dressing and less watering should be mastered. It is necessary to strengthen the cultivator to raise the temperature of the ground and remove the carbon dioxide and some harmful gases generated when the fertilizer is decomposed, so that fresh air can enter the soil and promote root growth. In the morning, after the exposing, the temperature outside the warm room is low, and a large amount of floating fog will form in the room. If the diaphragm is ventilated, the temperature in the greenhouse will drop sharply, and it will be unfavorable to the growth of the vegetables. General ventilation and dehumidification time should be after the outside temperature and indoor humidity rise, split from the top of the shed room 15 to 20 cm wide slit, close after half an hour, in order to facilitate warming and heat storage. Use the same method to ventilate 1 or 2 times before noon.
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