In the winter production of solar greenhouses, continuous cloudy or rainy and snowy weather often causes insufficient light and low night temperature, which is likely to cause various diseases and physiological obstacles, resulting in poor product quality and low yield, which seriously affects the economy benefit. To solve the above problems, the following 7 aspects should be paid attention to in management work: 1. Strengthen insulation measures In cold weather, increase the greenhouse cover. At night, add straw curtains or corn stalks around the greenhouse, dig a cold-proof ditch in front of the shed, or add a layer of old film on the straw curtain, which can not only keep warm, but also prevent rain and snow Wet the grass curtain. 2. Strengthen light management Effective measures should be taken to increase the light time, increase the light intensity, and promote the photosynthesis of vegetables. Frequently clean the film surface to increase the light transmittance of the film; under the premise of ensuring the temperature, the straw curtain should be opened early and late cover, and the roller shutter machine should be installed to shorten the time of the roller and curtain, so that the vegetables can see light early and more light, and increase photosynthetic products Accumulation. In case of continuous cloudy days and no rain or snow, draw draft curtains or interval curtains to increase the diffused light. You can also hang reflective curtains in the room or whitewash the back wall, install incandescent lamps, etc. for artificial lighting. 3. Timely and scientifically release air to cool and remove humidity High-performance and energy-saving solar greenhouses can reach a maximum indoor temperature of over 32℃ at noon on a sunny day in winter. At this time, open the skylight to let the air out. Due to the low outside temperature, the temperature difference between inside and outside the greenhouse is too large. If the temperature is below ℃, the skylight should be closed to increase the temperature of the greenhouse heat storage. When the indoor temperature rises to about 30℃ again, the skylight should be reopened to release air and remove humidity. This ventilation management should be repeated many times to keep the indoor temperature at 20-25℃ in the afternoon. Due to the repeated heating and air release, the water vapor in the greenhouse can be effectively removed, carbon dioxide gas can be supplemented, the indoor temperature is maintained within the appropriate humidity range for plants, and the development and spread of diseases can be effectively controlled. If only one ventilation and dehumidification is performed at noon, the humidity and fog in the greenhouse will be heavy the next morning, which will aggravate the occurrence of diseases. It is not advisable to release air and remove humidity immediately after uncovering the greenhouse in winter. After the solar greenhouse is covered with drip-free film, due to the low outside temperature, after uncovering the greenhouse, a lot of fog floating in the greenhouse is often seen. If the skylight is opened immediately at this time, the outside world is 0 The cold air below ℃ entering the greenhouse will further accelerate the condensation of water vapor, make the fog heavier, and accelerate the infection and spread of diseases. Therefore, except for the severe cold season, the solar greenhouse in winter should generally open the skylight to exhaust moisture after the minimum temperature outside reaches 0℃. Generally, a small slit 10-15 cm wide can be opened for half an hour to remove the fog in the greenhouse. At noon, let the water vapor in the greenhouse be discharged to reduce the condensation on the leaves. 4. Scientific watering and fertilization It is necessary to coordinate the relationship between watering, raising ground temperature and reducing indoor humidity, and implement full film coverage to reduce water evaporation and lower humidity. When watering, look at the weather forecast, the soil moisture, and the appearance of the vegetables. Do watering on sunny days without watering on cloudy days; water in the morning on sunny days and no water in the afternoon; water warm water instead of cold water; water dark water or drip irrigation in the trench under the film. It is necessary to combine watering for formula top dressing, and use zinc, boron and other micro-fertilizers to enhance the body's disease resistance and disease tolerance. In addition, in winter, the ground temperature is low and the root absorption capacity is poor. Foliar fertilizer can be sprayed to supplement plant growth needs. For example, spraying rice vinegar on leaves can inhibit bacteria and repel insects, and mixed with sugar and superphosphate can not only play the role of extra-root dressing, but also increase the sugar content of mesophyll and improve cold resistance. 5. Make plant adjustments in time Fruits, vegetables and vegetables should be hung vines, pruned and topped, flowers and fruits thinned, and improved ventilation and light conditions and vegetable nutritional status. 6. It is not advisable to uncover the grass for a long time in winter When the continuous cloudy weather suddenly turns into sunny, you should not uncover all the grass thatch during the day when you pull the grass thatch. It is necessary to "open the flower thatch", that is, one-third of the first morning on the first day of clearing, and then uncovered at 2 pm Two-thirds, after another hour, all the grass thatch will be uncovered. The light in the greenhouse is gradually increased and the temperature rises slowly to avoid flashing. If the grass thatch is uncovered all at once, the seedlings in the greenhouse suddenly encounter strong light and high temperature, and the leaf surface transpiration water content is large, exceeding the absorption water content of the root system, and it is easy to cause the plants to wilt and die. 7. Timely control of pests and diseases In winter, fumigants and dusts should be used for prevention and control, spray as little as possible, and reduce indoor humidity to help control the occurrence and spread of diseases. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone HGH Products stands for recombinant human growth hormone. 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