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早春时节,天气多变,气温忽高忽低,低温会使棚内培育的长豇豆、番茄等幼苗遭受不同程度的冻害。冷空气过后,随着天气的放晴,棚内温度又突然升高,致使大棚菜苗发生徒长、萎蔫现象。冻害苗主要是苗床温度过低引起的。防治方法:1.改进育苗手段,采用人工控温育苗,如电热温床等。2.保暖防冻,加强夜间保温,如加盖厚草帘、搭设小拱棚等,必要时可生火炉等加温。3.适当控制浇水,合理增施磷肥,提高秧苗
Early spring season, the weather is changing, the temperature fluctuated, low temperature will make shed cultivated asparagus bean, tomato and other seedlings suffered varying degrees of frost damage. After the cold air, with the sunny weather, shed temperature suddenly increased, resulting in greenhouse vegetable lengthened, wilting phenomenon. Frost damage seedlings mainly caused by the temperature is too low. Control methods: 1. To improve the means of raising nursery, artificial temperature control nursery, such as electric hotbed. 2. Warming antifreeze, strengthen the night insulation, such as thick straw curtain affixed, set up a small Shed, etc., if necessary, heating furnace heating. 3. Proper control of watering, phosphorus fertilizer increase, raising seedlings