The solar greenhouse refers to a crop cultivation facility that uses sunlight as an energy source for warming. Since its development, it has been deeply loved by farmers. The wintering requirements of flowers may cause damage to plants in winter and even in spring and autumn. After freezing damage, the plant cell gap or intracellular ice, dehydration of the protoplasm, damage the biofilm, destroy the chloroplast; after chilling, various physiological functions in the plant occur obstacles, the viscosity of the protoplasm increases, the respiration is weakened, water loss or lack Water died. Due to the diversity of plants and different varieties of the same species with different cold resistance, the available ways to deal with cold injury and freezing injury are: 1. Cold-proof exercise, gradually reduce the temperature so that the plants adapt to changes in low temperature, the cold resistance increased. 2. Water spray irrigation, timely deep sowing, increase phosphorus, potash fertilizer resistance to cold. 3. Select grafted cold-resistant rootstocks and cultivate cold resistant varieties. 4. To improve the microclimate, use greenhouses, hotbeds, impotence, soil warmers, smoke and other methods to fight cold. When using the above methods, we must consider the characteristics of the flower itself, in general: subtropical and temperate plants can safely winter in winter above 5 Celsius. Characteristics of Solar Greenhouses Solar greenhouses are generally 2.8 to 3 meters high, with a 7 meter inner span and a total length of 50 to 60 meters. The roof angle is 25 to 28, and the rear roof elevation angle is 35 to 40. The east, west and north walls are 50 to 80 cm thick, and the grass is 5 cm thick. The roof uses PVC anti-aging drop-free solar film. Solar greenhouses use sunlight as an energy source and fully absorb light during the day. Cover the grasshopper at night to minimize heat loss and keep the room warm by the relatively thick northern wall. Therefore, winter lighting conditions have become an important factor in the success of production. "I am afraid that the weather is cold, I am afraid of more cloudy days," which is a true reflection of the solar greenhouse. In addition, in the use of solar greenhouses, temporary fires or flue ducts must be added to warm up the fire for 5 to 10 days when the minimum temperature on a cloudy day or in the room drops below 5. Changes in the temperature of solar greenhouses For room temperature changes in solar greenhouses, we explored two scenarios: sunny day room temperature changes and cloudy day temperature changes. On a sunny day, 9 o'clock exposing to 13 o'clock is a rapid warming phase, which warms up 5 to 7 per hour. From 13am to sunset, the temperature dropped to 16, with an average drop of 4 to 6 per hour. From 16 o'clock to 24 o'clock, the room temperature will drop to 13 oC. The temperature ranges from 12 to 8 from zero to 9 am. According to the above rules, we must pay special attention to the reading of the indoor thermometer when using and operating. If the room temperature is too high, immediately take ventilation, watering and other measures to keep the room temperature within the range that is conducive to the growth of flowers. For example, the temperature can be adjusted by opening and closing the vents and controlling the opening and closing time of the vents. Improve the following aspects, can increase the temperature within the greenhouse: 1, the thermal conductivity of the wall material. 2, the thickness of the wall. 3, increase the thickness of grasshoppers. 4, check and repair the damage of the film and so on. On cloudy days, the sky has clouds, reducing the intensity and time of sunlight. On a continuous cloudy day, the greenhouse does not receive enough light, heat continues to dissipate, and room temperature continues to drop. The maximum temperature during the day is between 12 and 14 o'clock. The temperature is between 14 o C and 16 o C. The rest is maintained at 8 o C to 14 o C. Snow is 2°C to 3°C lower than a cloudy day. For continuous cloudy days, the room is generally maintained at 8°C to 10°C. In this case, it is very probable that the flowers will suffer from frost damage. Warm up the fire temporarily with temporary fires, and do not hope to see the sunrise on the second day. This is very important, and it is also the main reason for the failure of beginners. Be sure to keep the indoor temperature above 8°C so that you can prevent problems and make the flowers safe for winter. Some suggestions for using the solar greenhouse 1. To prevent the continuous cloudy temperature below the critical temperature, the solar greenhouse must increase the temporary warming fire. 2. To hunt 4 to 5 mercury thermometers in a solar greenhouse for daily observation. 3, the best use of anti-aging non-drip film, 2 to 3 years later, the film light transmittance decreased, it is necessary to replace. 4, timely lift the lid, fight for light, reduce heat. 5. After cleaning the roof every day, use a long rod to clean the surface of the shed and keep the shed clean. This can delay the aging of the film, increase the light transmittance of the film, and increase heat absorption.
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