一、防冷害 冷害是大棚蔬菜的主要灾害。预防冷害的方法是提高棚内温度，其具体措施，一是采取多层薄膜覆盖，如大棚套小棚加地膜平铺；二是围草帘抗寒，夜间大棚内侧四周围１米左右高的稻草帘，可提高棚内温度２－３℃，或在小棚上覆盖草帘，均有增温效果；三是人工加温，安上 First, anti-chilling chilling injury is the main greenhouse vegetable disaster. Prevention of cold damage is to raise the temperature inside the greenhouse, the specific measures, one is to take a multi-layer film covering, such as the greenhouse sheds with plastic film tiling; Second, the curtain shade cold, around the inside of the greenhouse at night about 1 meter high Straw curtain, can increase the shed temperature 2-3 ℃, or in the shed on the cover straw, have warming effect; Third, artificial heating, security