Attention! In winter, the management of greenhouses should be “internal and external repairâ€. It is necessary to adopt multi-cover cultivation techniques for cold-proof insulation production. By covering the plastic film, the heat capacity of the soil is increased; the straw curtain is covered on the greenhouse film, and the straw curtain is covered. A layer of plastic film prevents rain and snow from getting wet, effectively increasing the temperature inside the shed. Through such multiple coverage, the temperature in the greenhouse can be increased by 3 ° C ~ 5 ° C, with a good cold insulation effect. In case of strong cooling weather, temporary heating measures should be taken. At the same time, it is necessary to promptly apply fertilizers to promote growth, and apply appropriate amount of quick-acting nitrogen fertilizer and phosphorus and potassium fertilizer to the heavier frozen fields to promote the plant to resume growth as soon as possible. After the snow, the greenhouse should pay attention to returning to the curtain in time to prevent wilting. To increase the light intensity of the shed, the simple insulation measures not only fail to increase the temperature, but also cause the yellowing of vegetables in the dark environment. The correct way is: even in the case of continuous cloudy, rainy, snowy weather, you should uncover the straw curtain every day, let the vegetables receive the scattered light to maintain the normal activity of chlorophyll, and adopt various ways to improve the illumination in the shed. Important technical measures for winter management. It is also possible to hang a reflective curtain on the north wall of the greenhouse, which is as long as the greenhouse. At the same time, it is necessary to keep the shed film clean and transparent, and improve the light transmittance of the shed film. In addition, under the premise of not affecting the temperature, the straw curtain should be uncovered as early as possible to extend the illumination time of the vegetables. To timely control disease crops, we should focus on the management of temperature and humidity and the ratio of nitrogen, phosphorus and potassium fertilizers. In particular, nitrogen fertilizer should not be applied, pay attention to the application of organic fertilizer. Continuous rain, snow and cold weather, the humidity in the shed is large, we must pay attention to the prevention and spread of vegetables, melons and diseases, and gray mold.
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