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How to use plastic greenhouse to grow flowers
In recent years, plastic greenhouses have been widely used in flower cultivation, but the plastic greenhouse insulation performance is limited. According to our many years of observation, during the sunny day, the temperature in the shed is increased quickly, which is 15~25°C higher than outside the shed. In the late night or early morning, the temperature in the shed is only 1~3°C higher than the shed. The continuous rain and snow weather, the temperature within the shed is only 2 to 4 °C outside the shed. Therefore, we must rationally use plastic greenhouses according to different types of flowers. 1. Flowers that need wintering in the cold room, such as potted tea leaves, rhododendron, palm bamboo, wolfberry fruit, mirage, hibiscus, etc. In the Yangtze River valley, as long as they are protected at a low temperature, they can safely overwinter in a dormant state and enter the shed. It is important to pay attention to ventilation and cooling in sunny days. Do not cope with high temperatures. If you break the dormancy and enter the growth state, your ability to resist cold will be greatly reduced and it will be frozen. Of course, if it is for the purpose of flowering, it is another matter. 2. Flowers that need wintering in high-temperature greenhouses, such as bamboo flowers, clams, cactus, pineapples, brazilian iron, money tree, dragon blood tree, tropical orchid, etc., in the Yangtze River speed zone, rely on single-layer plastic greenhouses for winter is not enough. Other measures must also be added to ensure safe wintering. First, the greenhouse was covered with insulation material to prevent heat loss at night. This method is extremely effective at night on sunny days. Second, a simple shed is set in the greenhouse, ie, a double shed. The distance between two plastic films is preferably about 10 cm. The air has a smaller thermal conductivity in the middle. The insulation effect is better, and the temperature in the shed is relatively stable. Third, warming up, using electric heating 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 shall also be ventilated during the daytime when the temperature in the shed exceeds 25°C, and remain dormant for winter. If there are warming conditions, the cultivators need to be promoted. 3, need to grow in the greenhouse, winter or early spring flowering flowers such as Cintomia, Primula, Pouch, Cyclamen, Calla, etc., the daytime temperature is maintained at 15 ~ 20 °C, shed temperature should be ventilated, night coverage Insulation, if the temperature is too low, it should be warmed up and kept at about 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. In order to meet the needs of different flowers and to facilitate management, it is best to use the same variety in plastic greenhouses. If there are no conditions, they should be categorized according to the different requirements for temperature. In a large shed, the south is bright, the temperature is high, the light in the north is weak, and the temperature is relatively low. Pay attention to reasonable arrangements or rotations. 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.