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北方冬季自然光时间短 ,强度较弱 ,为了有效地增加棚（室）采光率 ,提高棚（室）蔬菜产量和改善蔬菜品质 ,现根据笔者总结各地实践经验提出增加采光五招如下 :一、精选无滴膜目前 ,市场上出售的塑料薄膜多为普通膜 ,由于棚（室）内湿度大 ,所以常常会有许多水滴附着在棚膜上 ,?
In order to effectively increase the daylighting rate of the shed (room), increase the yield of vegetables in the shed (room) and improve the vegetable quality, the northern part of our country proposes the following five steps to increase the daylighting according to the practical experience of all parts of the country: At present, the plastic film sold on the market are mostly ordinary film, because of the humidity inside the shed (room), so often there will be a lot of water droplets attached to the greenhouse film?