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多次覆盖或两层覆盖先用地膜覆盖小拱棚,提早定植瓜类等蔬菜。气温回升后,就地覆盖地面,或同时用地膜套小拱棚覆盖。一膜多次覆盖一般可覆盖两次以上。如先平地覆盖越冬菜,再覆盖早春菜或马铃薯,还可用来覆盖夏季茄果类、瓜类、豆
Multi-coverage or two-story coverage with a small shed with a small plastic cover, early planting melons and other vegetables. After the temperature rises, covering the ground on the spot, or covered with a membrane arch shed at the same time. A film covering multiple times can generally cover more than twice. Such as first-level coverage of winter vegetables, and then covered with early spring vegetables or potatoes, but also can be used to cover summer solanaceous, melons, beans