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一、防止烤苗与寒苗。 1、地膜覆盖栽培中发生烤苗的原因有两种:一是放风不及时或放风量不够,地膜下高温烧伤菜苗;二是定植孔等封闭不严密,膜下高温、高湿气体从孔中冲出伤害作物茎叶。防止办法是及时放风炼苗;平时要把引苗出膜的膜孔及定
First, to prevent roasted seedlings and cold seedlings. 1, there are two reasons for baking seedlings in mulching cultivation: one is the lack of ventilation in time or the amount of ventilation is insufficient; the other is that the seeding holes are not closed properly; the membrane under high temperature and high humidity is removed from the holes Out of injury crop stems and leaves. To prevent the timely release of the practice of Harvesting; usually should lead seedlings out of membrane holes and set