冬春季节,采用塑料大棚栽培的蔬菜,经常遇到阴冷、风雪、雨等恶劣天气的侵袭,管理不当往往会造成较大的经济损失。 1.阴冷天气 早春季节,遇到持续低温、寒流天气,苇毛苦、草苫子等覆盖物要适当晚揭。揭苫后要注意畦温变化,如果畦温稍有下降,应随揭随盖,畦温稍有回升,可以在下午2时以前把覆盖物重新盖好,为加强夜间保温,可以增加覆盖物 Winter and spring, vegetables grown in plastic shed often encounter cold weather, snow, rain and other inclement weather attacks, improper management often result in greater economic losses. 1. Cold weather Early spring, met with sustained low temperature, cold weather, reed hair, grass 苫 son and other coverings should be properly late exposure. Should pay attention to the temperature change after the exposure, if the temperature drops slightly, should be exposed with the lid, the temperature rise slightly, you can cover before 2 pm to re-cover, to enhance the insulation at night, you can increase the cover