According to observations, during a sunny day, the temperature inside the shed can be increased quickly, which can be 15°C to 25°C higher than outside the shed; and at night or early in the morning, the temperature in the shed is only 1°C~3°C higher than the shed; the continuous rain and snow weather can be seen in the shed. Temperature and temperature difference outside the greenhouse 2 °C ~ 4 °C. Therefore, according to different types of flowers, rational use of plastic greenhouses. First, the flowers that need wintering in the cold room such as potted tea leaves, azaleas, palm bamboo, mimosa, primrose, etc. in the Yangtze River valley, as long as a little protection at a low temperature can safely overwinter in a dormant state. After entering the shed, pay attention to the ventilation and cooling of the sunny day, and do not break the dormancy. Of course, if it is for the purpose of flowering, it is another matter. Second, in the high-temperature greenhouses need to spend winter flowers, bamboo grass, change leaf wood, cactus, pineapple, Brazil iron, money tree, dragon tree, tropical blue and other hi-temperature flowers. First of all, the greenhouse is covered with thermal insulation materials to prevent nighttime heat loss. This method of sunny days is extremely effective. Second, a simple shed is placed inside the greenhouse, ie, a double shed. The distance between two plastic films is preferably about 10 cm. The air has a small thermal conductivity in the middle, and the insulation effect is better. The temperature inside the shed is relatively stable. Third, warming up, using electricity or boiler heating, energy consumption is relatively high, the cost is high, can be combined with the first two measures, at a special low temperature and short rain and snow days application. Such flowers need to be ventilated during the daytime when the temperature in the shed exceeds 25°C and remain dormant for winter. If you need to promote the exception of growers. Cineraria, Primula, Pohuhua, Cyclamen, Calla, etc., during the day, the temperature is maintained at 15°C～20°C. The air temperature in the shed should be ventilated, cover the heat at night, the temperature should be too low, and keep at 5 °C, not lower than 0 °C. In addition, the air humidity in the greenhouse is large, and special attention is paid to the prevention and control of fungal diseases such as black spot and powdery mildew. The flowers that dorm over winter must stop fertilizing, control the watering, and maintain a semi-arid state to prevent the rot of the roots. The flowers growing in the shed must also be properly controlled for watering. See the wet and dry, often ventilate and regulate the seedlings, and maintain strong growth. Grow. (Source: Modern Rural News)
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