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。 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 shed heat loss, but also to prevent snow wet grass 苫.