Greenhouse Vegetable Management Measures Before Snow
When it is even cloudy, the grass thatch should be opened normally, and the precious scattered light should be obtained. The time should be one hour later than the sunny day.
Increasing the application of organic fertilizer can increase the heat capacity of the soil, buffer the cooling caused by the loss of heat in cloudy days, and promote the root system to improve its cold tolerance.
Appropriate water control is very important to reduce the relative humidity of indoor air, and at the same time it can create an environment with sufficient bottom moisture and dry topsoil.
Vegetable management measures in greenhouses in snow
When it snows, we should cover the greenhouse with cold-proof film in time. Use the grass thatch to block a layer of cold-proof skirt at the front of the greenhouse, and close the buffer room door tightly to prevent cold wind from entering.
The photosynthesis of vegetable crops on snowy days is very weak, and the synthesized photosynthetic products are few. In order to reduce respiratory consumption, the construction temperature of vegetable greenhouses at night should be 2℃~3℃ lower than that on sunny days.
In the case of continuous cloudy and snowy days, the respiratory consumption of vegetables is greater than photosynthesis, and a large amount of harmful gases such as carbon dioxide will accumulate in the greenhouse. Therefore, in continuous cloudy and snowy days for more than three days, the wind must be released for 1 hour when the snow stops at noon.
Greenhouse Vegetable Management Measures after Snow
After snowing, the snow on the shed film should be cleared in time to increase the transparency and the amount of light; as long as the temperature does not cause the shed temperature to drop sharply after uncovering, the grass should be seen every day.
When the sun comes out, if the leaves appear wilting, you should lay down a part of the grass thatch to shading the light. You can place one at a time. After the wilting recovers, roll the thatch up again. If the wilting reappears, you can put down the grass thatch. Repeat this several times. Normal wilting can be restored.
When a disease has occurred in the greenhouse, and conventional spraying will not only increase the humidity of the greenhouse, but also aggravate the disease, the use of aerosols such as chlorothalonil and sukeling can be used for fumigation control.
In order to prevent vegetables from freezing, loosen the soil in time, apply appropriate amount of quick-acting fertilizer, and spray 0.2% potassium dihydrogen phosphate solution on the leaf surface to promote vegetable growth.
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