早春经常有雨、雪、风等不良天气,蔬菜育苗应根据天气变化,采取相应的技术措施,防止秧苗受害。 1.阴、雨、雪天湿度大,无阳光,应将棚温降2～3℃,并进行短时间通风降湿,排除有害气体。但下雨时不要通风。 2.阴雨天停止打药和灌水。连续阴天注意排湿,可在秧苗间撒草木灰、墙坑土等、以防猝倒病发生。 3.连阴暴晴,幼苗较嫩,中午盖草苫,以防苗萎蔫。 4.降雪后应及时扫除塑料膜 Early spring often rain, snow, wind and other adverse weather, vegetable nursery should be based on weather changes, take appropriate technical measures to prevent the victims of seedlings. 1. Yin, rain, snow, humidity, no sunshine, the shed temperature should be 2 ~ 3 ℃, and a short time ventilation and humidity, remove harmful gases. But do not ventilate when it rains. 2. Rainy day to stop playing drugs and irrigation. Row of rainy days pay attention to the row, in the seedlings sprinkle ash, wall pit soil, to prevent the damping off disease. 3. Liangyunqingqing, more tender seedlings, noon covered grass 苫, to prevent seedling wilt. 4. After the snow should promptly remove the plastic film