Snowy days in winter

The current snowfall and snowfall will come one after another, and the numerous snowflakes will also come to the earth. How to manage pre-snow, snow, and snow greenhouse vegetables is particularly important. It is summarized as follows for the reference of farmers.

First, before the snow sheds vegetables management measures even when cloudy, we must normally uncover the grasshoppers, and fight for precious scattered light, the time to grasp in the earlier than the sunny expo cover each one hour. 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 a dry bottom environment.

Second, snow in the greenhouse vegetable management measures

1. When it's snowing, it's time to put on a good grasshopper, cover the greenhouse in time with a cold-proof film, use a grass rake to block a layer of cold-proof skirts at the front edge of the shed, and close the buffer door tightly to prevent cold wind from entering.

2. 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 2-3°C lower than the nighttime of sunny days.

3. In the period of continuous snowfall, the respiratory depletion of vegetables is greater than photosynthesis, and a large amount of harmful gases such as carbon dioxide will accumulate in the greenhouse. Therefore, for more than three days in a period of continuous snowfall, snow should be released for 1 hour at noon.

Third, the greenhouse after the snow vegetable management measures

1. The snow on the shed film should be cleared in time after snow to increase the transparency and the amount of light; as long as the temperature does not cause a sharp drop in the temperature of the shed after the exposing, it should be revealed every day.

2. When the sun comes out, if the leaves appear wilting, some grasshoppers should be put down and shading, and they can be placed one at a time. (The shanty who uses the roller blinds can roll the grasshopper to the middle of the shed first, instead of pulling it all open once). After the restoration, the draft is drafted again. If the wilting reappears, the grasshopper can be put down again. This way, it can be repeated 2-3 times and the general wilting can be restored.

3. If disease has occurred in the greenhouse, conventional spraying will not only increase the humidity in the greenhouse, but also increase the severity of disease. It can be treated with aerosols and dust agents such as chlorothalonil and sulfamate to facilitate uniform application and avoidance of sheds. The air 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.

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