严冬季节,气温较低,大棚花卉受冻害的情况时有发生。现介绍几个预防冻害的方法:增加覆盖物夜间在大棚四周加围草苫或玉米秸,可增温1℃~2℃。在原来的草苫上再加1层薄苫子,可使棚温提高2℃~3℃。在原来的草苫上覆盖1层薄膜,不仅可以挡风,还能防止雨雪打湿草苫,从而减少因水分蒸发引起的热量散失。大棚周围熏烟寒流到来之前,在大棚周围点火熏烟,可防止大棚周围的热量向高空辐射,减少热量散失。经常清扫棚膜及时清除棚膜上面 The winter season, the temperature is low, the greenhouse flowers by the freeze from time to time have occurred. Here are a few ways to prevent frost damage: increase coverage at night around the greenhouse plus grass or corn stalks, warming 1 ℃ ~ 2 ℃. Add a thin layer of prickly heat on the original grass 苫, can increase the shed temperature 2 ℃ ~ 3 ℃. In the original grass 苫 covered with a film, not only can wind, but also prevent rain and snow wet grass 苫, thereby reducing the evaporation of water caused by heat loss. Fumigation around the greenhouse before the arrival of cold, fumigation around the greenhouse fumigation to prevent the heat around the greenhouse radiation to high altitude, reducing heat loss. Often clean the greenhouse film in time to clear the top of the film