The correct use of plastic greenhouses

In recent years, plastic greenhouses have been widely used in flower cultivation, but the thermal insulation performance of plastic greenhouses is limited. According to our observations over many years, during a sunny day, the temperature in the shed can increase rapidly, which can be 15°C to 25°C higher than outside the shed. In the late night or early morning, the shed temperature is only 1°C to 3°C higher than outside the shed. The continuous rain and snow weather, the shed temperature is only 2 °C to 4 °C outside the shed. Therefore, we must rationally use plastic greenhouses according to different types of flowers.

First, flowers that need wintering in the cold room, such as potted tea leaves, azaleas, palm trees, gardenia, mimosa, hibiscus, etc. in the Yangtze River valley, as long as they are protected at a low temperature, they can safely go to winter 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.

Second, the need to spend winter in the high-temperature greenhouse flowers, bamboo, wood, cactus, pineapple, Brazil iron, Pachira, dragon tree, tropical blue and other high-temperature flowers, in the Yangtze River Valley, by a single layer of plastic greenhouse wintering is If it is not enough, other measures must 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 the two layers of plastic film is preferably about 10 centimeters. The air has a smaller thermal conductivity in the middle. The effect of heat preservation is better, and the temperature inside 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.

Third, the need to grow in the greenhouse, winter or early spring flowering flowers such as cineraria, Primula, Pohuahua, cyclamen, Calla, etc., the daytime temperature is maintained at 15 °C to 20 °C, shed temperature should be ventilated, night Covering insulation, the temperature is too low should also be increased, maintained 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.

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