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近年来，塑料大棚在花卉栽培上广泛应用，但塑料大棚的保温性能是有限的。据我们多年观测，晴朗的白天，棚内升温快，可高于棚外15～25℃；而深夜或清晨，棚内气温只高于棚外1～3℃。连绵的雨雪天气，棚内气温也只高于棚外2～4℃。因此，我们要根据不同类型的花卉，合理使用塑
In recent years, plastic greenhouses are widely used in flower cultivation, but the plastic greenhouse insulation performance is limited. According to our observation for many years, during sunny day, the shed warms up quickly, which can be 15 ~ 25 ℃ above the shed. In the middle of the night or early morning, the temperature inside the shed is only 1 ~ 3 ℃ above the shed. Rainy and snowy weather, shed temperature is only higher than the shed 2 ~ 4 ℃. Therefore, we must use plastic according to different types of flowers