In winter, the cooling of snowfall often has an adverse effect on the growth of greenhouse vegetables. Yang Zhongan, a professor at the Agricultural Science Academy of Northwest Agriculture and Forestry University, reminded farmers to combine the growth characteristics of vegetables in winter greenhouses and take emergency measures against the snow.
Remove the snow on the shed film in time to clear the snow cover, increase the transparency and the amount of light; as long as the temperature does not cause the shed temperature to drop sharply after demolition, it should be clear every day.
Short-term ventilation Continuous rainy days also use high-temperature periods at noon during the day, promptly uncover sheds, grasshoppers, and other coverings to allow crops to see the light for a short period of time, and conduct timely ventilation and dehumidification.
When the snow sheds are closed in a timely manner after the snow curtains are returned to the air, the air curtain room should pay attention In the case of sudden sunny weather after snowfall, attention should be paid to the back-curtain, that is, to reduce the temperature of the room by slowly removing a few grasshoppers, and observe the performance of the leaves. If the leaf is normal, then gradually increase the number of uncovered curtains until all are uncovered. If a wilting phenomenon is found, a few straw curtains should be promptly covered to allow the crop to adapt. In addition, two curtains can be hung in the greenhouse, and the thickness of grasshoppers can be increased on the outside to prevent cold and heat.
After the snow science, the fertilizer needs to be rejuvenated. After the snow is sunny at noon, the leaves are sprayed with 1.8% foliar solution, 4000-6000 times liquid, 0.2% potassium dihydrogen phosphate solution, or other suitable foliar fertilizer. , supplement nutrition, improve plant quality, prevent and mitigate freezing injury. However, the use of nitrogen fertilizers should be controlled so as to avoid excessive absorption of nitrogen and anti-potassium fertilizers to cause physiological deficiency.
Prevention of various diseases Winter is affected by continuous rainy weather, weak plant growth, poor quality, and the high humidity in the shed is prone to diseases. Dry leaves and frozen stems and leaves should be promptly removed to reduce the incidence of disease. Once the disease is found, it is best to use aerosol or dust agent to prevent and control, to prevent the increase of greenhouse humidity due to treatment. Sclerotinia, gray mold, and powdery mildew can be controlled. The agent can be selected from either Pythium or chlorothalonil. After being ignited in the evening with dark flames, it can be smoked overnight. The next day, the door can be ventilated, or it can be used. Mildew ultrafine dust control.
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