Vegetables grown in plastic greenhouses in winter often encounter severe weather such as snow, rain, and cooling. Poor management often results in huge economic losses.
During the snowfall during the snowfall, it is necessary to cover the snow during the day, cover the mane grasshoppers, and then cover the grasshoppers. After the snow stops, the snow will be cleared immediately. At night, the snow will be removed and the snow will be promptly removed after the snow stops to keep the cover dry, and the cover will be peeled off in time. See seedlings see light. The continuous cloudy snow weather suddenly turns fine. After removing the cover, pay attention to observe the change of the seedlings and find the wilt. Immediately cover it with a bristle, recover it and then uncover it. Wilt and then cover it. Such repeated, after 2 to 3 days Can be transferred to normal management;
Rainfall during the daytime rainfall, timely removal of coverings, to prevent the bedding hairy, grass seedlings, etc. are affected by the rain to affect the insulation effect, but be careful not to make the rain poured into the urn; night rainfall, after the rain, pay close attention to the drying of the cover.
Cooling in the nighttime In early spring, it often occurs in a few days of sunny and warm weather, that is, a cold current; when the cold current arrives, it often occurs suddenly at night, and there is a slight oversight in management, which will cause great losses. To this end, we must pay attention to listening to and watching the weather forecast of local meteorological stations frequently. In the event of night-falling weather, we must cover and tighten the coverings of mane grasshoppers, grasshoppers, and so on. If the cooling rate is excessive, we must increase the coverage appropriately. .
In cold and cold weather, in winter or early spring, when it encounters persistently low temperature and cold weather, cover of mane grasshoppers and grasshoppers should be exposed properly. After the exposing ceremony, it is necessary to observe the changes in the temperature. If the temperature is slightly reduced, it should follow the cover. The temperature will rise slightly. The cover can be re-covered before 2 pm. In order to strengthen the heat preservation at night, the number of bristles can be appropriately increased to thicken the cover. When the bristles are insufficient, cover the grasshopper. There are many vegetable farmers who often do not open the cover on the day or even several consecutive days in cold and cold weather. As a result, the seedlings will grow weak. When the weather warms up, it will easily cause wilting death (commonly known as “flashing seedlingsâ€). ).
In the windy weather, the transparent cover is fixed during the day, it is not blown by the wind, and is tightly covered at night. If necessary, the mane grasshopper, grasshopper, etc. are pressed well. Otherwise, once the wind is blown off, the seedlings are easily frozen. . In the mid- and late-stage encounters with southerly weather, although the temperature is relatively high, cold air should be prevented from blowing directly from the vents into the raft to avoid damaging the seedlings; if necessary, it can be ventilated in the mouth of the raft.
Before and after noon around noon, the sun shines around noon, and the sunlight changes rapidly. If clouds appear in the sky, observe the changes of the temperature at any time. Clouds cover the sun, the temperature of the earth will be lowered, and the ventilation holes shall be closed; The temperature will rise quickly and the vents should be opened in time to prevent the seedlings from being roasted, especially when the top of the seedlings touches the plastic film.
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