Winter is the season with the shortest light and the most frequent cold air activity in the year. From time to time, there will be weather such as cooling, wind and rain and snow. In addition, poor ventilation and insufficient light in vegetable greenhouses will seriously affect the growth of vegetables. . Therefore, in the process of planting vegetables, in the face of extreme weather in a short period of time, it is necessary to strengthen prevention and adopt corresponding countermeasures to make vegetable production develop steadily. Today, Xiaobian talks about the winter cold temperature and rain, cold current and other climates, and the countermeasures for winter cultivation of facility vegetables. First, sunny On sunny days, we must do a good job in the management of fertilizer and water, organize the plants, and ventilate and cool the greenhouses; do a good job of pest control measures, and other daily management points. Second, low temperature and rain 1, reduce air humidity According to the growth of different crops, the amount of watering should be controlled as much as possible, and the method of drip irrigation should be adopted when watering. At the same time, greenhouse watering should be ventilated and dehumidified according to wind and wind direction to prevent disease. 2, take light-filling measures Timely pruning, old leaves, ventilation and light; use scattered light to improve the temperature and illumination in the shed, so that the leaves can be photosynthesized; according to different weather such as cloudy, rainy days, timely adjust the cover removal time; Measures such as silver film, artificial light filling, and surface fouling of the film to improve the lighting conditions. 3, increase the temperature inside the shed In the early hours of the morning, the temperature is low and the humidity is high. The plants are susceptible to freezing damage, so they can be warmed by carbon fire, but in the early morning, they should be ventilated in time to prevent carbon monoxide poisoning. 4, plant management When the plant appears to have flower topping and new shoot growth stagnation, it can be used to coordinate the management of temperature and low temperature in the shed when the weather is warming and the lighting conditions are improved; choose sunny and warm weather, remove flowers and fruits, and apply full solubility. High nitrogen fertilizer to enhance plant resistance. 5, prevention of disease Continuous low temperature and rainy days, gray mold, downy mildew and late blight are very easy to occur, so you can smoke in the evening, and timely release of wind and humidity. Third, the cold wind and cold damage 1, multi-layer coverage, strengthen insulation Build an inner shed, cover the non-woven fabric, and add straw between the outer shed and the inner shed to increase the insulation effect. 2. Warm the shed to keep the crop from freezing damage. 3, slowly warming up in the shed For vegetables that have been subjected to freezing damage, when the cover is exposed on a sunny day, the wind is cooled according to the temperature change to avoid necrosis of the frozen vegetable tissue due to a sharp rise in temperature. 4, hydration When the temperature rises rapidly in the greenhouse, in order to stabilize the temperature, water can be sprayed to increase the humidity of the air. 5. Finished by frozen plants For frozen plants, it is necessary to remove frozen shoots, leaves and fruits in time; drip irrigation and application, high-potassium fertilizer on the foliar spray, improve plant resistance; timely control of pests and diseases; spraying of plant growth such as alfalfa lactone on the foliage A regulator to increase the plant's ability to resist freezing. Fourth, occasional heavy snowfall 1. Listen to the weather forecast in time and prepare antifreeze materials in advance. 2. In case of heavy snow, it is necessary to clean the snow on the roof and the surrounding area in time to reinforce the greenhouse bracket. 3. After the snow has turned to clear, the cover should be removed in time to make the plants gradually adapt to the light, which can effectively alleviate the low temperature freezing damage and ensure the plant receives light.
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