Before snow
Even when it is cloudy, it is necessary to uncover the grasshoppers and fight for precious scattered light. Adding organic fertilizer before snow can increase the heat capacity of the soil, buffer the cooling brought about by the loss of heat from the cloudy days, and can also promote the root system to improve cold resistance. Moderate control of water before the snow is very important to reduce the relative humidity of the indoor air, and at the same time, it can create an environment where the bottom is damp and the topsoil is dry.
In the snow
1. Keep the cover dry. Once the grass bedding is wet with snow, its cold insulation performance will be greatly reduced. Therefore, the snow should be covered with a layer of plastic film on the grass, which can reduce the heat loss in the greenhouse and prevent the snow from soaking the grass.
2. Prevent snow pressure from causing the collapse of the shed body. Due to the effect of gravity, excessive snow can overwhelm the structurally weak greenhouses. For some sheds with large spans, few pillars or no pillars, temporary support pillars must be added on snow days to prevent any possible accidents.
3. Snow days can not cover grasshoppers. In the days of snowfall, the clouds are generally thick, and the ground is cooled slowly. The wind is small and the temperature is not too low. In order to reduce the trouble of removing snow, soaking the grass and soaking the grass and reducing the pressure on the roof of the grass, the grasshoppers can be rolled up during the snowfall, allowing snow to accumulate on the roof. After the snow stopped, the snow on the surface of the membrane was quickly removed and the grass was covered at night.
4. Photosynthesis of vegetable crops is very weak when snowing, and there are few photosynthetic products synthesized. In order to reduce respiratory consumption, the temperature of night greenhouses should be 2°C-3°C lower than the nighttime of sunny days.
5. In the continuous cloudy snow days, the respiratory consumption of vegetables is greater than photosynthesis, and large amounts of harmful gases such as carbon dioxide will accumulate in the greenhouse. Therefore, it is possible to let the snow stop at noon for an hour.
After the snow
1. Remove the snow on the film in time to increase the transparency and light input. For the snow around the shed body, it can not be removed, because the snow will not cause pressure on the shed body skeleton, thick snow layer can also play a role in insulation. As long as the temperature does not cause a sharp drop in the temperature of the shed after the exposing, it should be seen every day.
2. Prevent "flashing seedlings". Some vegetable farmers are afraid of freezing seedlings. They are not even exposed for several days in the snowfall days. The plants are not exposed to light for several days. This will make the seedlings grow weak. When the weather warms up, it will easily cause wilting death (commonly known as “ Flash seedling"). In production, we must pay attention to the weather when we encounter a long and clear sunny weather. Can be less exposed, so that the indoor temperature rise slowly, and pay attention to observe the performance of the blade. If the leaves are normal, then gradually increase the number of exposing till all uncovered; if there is a phenomenon of wilting, it should be promptly covered with a few grasshoppers. The exposing and reclamation sometimes need to be repeated for 2-3 days.
3. If diseases have occurred in the greenhouse, conventional spraying will not only increase the humidity in the greenhouse, but also increase the severity of the disease. It can be treated with aerosols such as chlorothalonil and sulfasalazine and dust to facilitate uniform application and avoid air in the shed. Humidity is too high.
4. In order to prevent vegetables from freezing, it is necessary to loosen the soil in time and apply the available fertilizer in appropriate amounts. 0.2% potassium dihydrogen phosphate plus 0.3% calcium nitrate plus 1% glucose can be used to enhance plant resistance; As a result, more plants were harvested in time, and sparse fruit was used to reduce nutrient consumption.
The snow has passed the solar terms, and the snow season is coming soon. The numerous snowflakes will also come to the earth. Vegetables that are cultivated in plastic greenhouses should be promptly taken countermeasures in the event of snow weather.
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