采用塑料大棚栽培的蔬菜,一旦遇上降雪天气,要注意及时采取以下应对措施。1.保持覆盖物干燥草苫一旦被雪水打湿,其防寒保温性能会大大降低。因此,雪天应在草苫上覆一层塑料薄膜,既可减少棚室内热量的散失,又可防止雪水浸湿草苫。2.严防雪压造成棚 The use of plastic greenhouse cultivation of vegetables, snowfall in the event of a weather, should pay attention to promptly take the following countermeasures. 1. Keep the cover dry grass 苫 once wet by the snow, its cold insulation properties will be greatly reduced. Therefore, the snow should be covered with a layer of plastic sheeting on the grass, not only to reduce the loss of greenhouse indoor heat, but also to prevent the snow soaked grass 苫. 2. To prevent snow pressure caused shed