In the winter, bad weather such as yin, cold, wind, fog, rain and snow often affect the production of shed vegetables, and improper disposal will cause significant losses. To this end, several countermeasures are described below.
The fixed shed film encounters windy weather, and the cover is fixed during the day so that it is not blown away by the wind; it is tightly covered at night, covered, and if necessary, the bristles and grass scorpions are pressed, once they are scraped off by the wind, The seedlings are extremely susceptible to freezing.
Keeping the cover dry grasshopper once it is wet by snow water or dew, its cold insulation performance will be greatly reduced. Rain and snow should be covered with a plastic film on the grasshopper, which can reduce the heat loss in the greenhouse and prevent rain. Snow soaked grass.
Strictly prevent snow from causing the shed to collapse and encounter snowfall. Due to the gravity of the snow, the snow is too thick and the shed can be crushed. For some sheds with large spans, few columns or no columns, it is necessary to add temporary columns to support the arches in the snowy days to prevent them from happening. After the snow stops, it is necessary to clear the snow in time, especially at night. For the snow around the shed, it can not be removed, because these snow will not cause pressure on the shed skeleton, and the thick snow layer can also play a role in heat preservation.
Snowfall days can be covered with grass and snow. Generally speaking, the clouds are thicker, the ground is slower, the wind is small, and the temperature is not too low. In order to reduce the trouble of snow removal, snow soaking grasshoppers and reducing the pressure of grasshoppers on the shed, the grass can be rolled up during snowfall, letting snow accumulate on the shed, and a thick layer of snow on the film surface It has a heat preservation effect, just like a layer of grasshopper. After the snow stops, the snow on the membrane surface is removed in time, and the grass is covered at night.
To prevent "flashing seedlings", some vegetable farmers are afraid of freezing the seedlings. They will not be exposed in the shades of yin, cold, rain and snow. They will not be revealed for several days. The plants will not see light for many days. This will make the seedlings grow weak and wait for the weather to warm up. When you see the light, it is easy to cause wilting death (commonly known as "flash seedling"). In production, when you encounter a weather that is a long time, you should pay attention to it. First, remove a few items to make the indoor temperature rise slowly, and pay attention to the performance of the blade. If the leaves are normal, gradually increase the number of exposures until all are revealed; if there is a wilting phenomenon, it should be covered with several grasshoppers in time. It is sometimes necessary to repeat the 2-3 days.
It is generally sufficient to increase the amount of fertilizer in the cultivating shed. In addition, the winter temperature is low and the plant growth is slow. Therefore, the amount of fertilizer and water demand are also small. The management can be done without topdressing and less watering. However, it is necessary to strengthen the cultivating to increase the soil temperature, and to discharge the carbon dioxide and some harmful gases released from the decomposition of the fertilizer in the soil, so that the fresh air enters the soil layer and promotes the growth and development of the root system.
Moderate ventilation in the morning after the exposure of the outdoor temperature is low, the interior will form a large amount of floating fog, this time if the diaphragm is ventilated, the temperature inside the greenhouse will drop sharply, which is not good for vegetable growth. Generally, the time of ventilating and dehumidifying the membrane should be after the outside temperature and indoor humidity rise, and the small slit of 15-20 cm wide is opened from the top of the shed, and then closed half an hour to facilitate heat storage. Use the same method to ventilate 1-2 times around noon.
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