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利用温室、大棚在冬春季生产鲜菜,如何保持棚内的适宜温度是首要问题。目前生产中常用的几种保温措施主要有以下几种。1.棚外覆盖:在严寒季节,夜间用草苫、纸被、棉被等覆盖在采光棚外面,早晨太阳升起后再及时揭开,使棚内采光增温。这种方法简便易行,保温效果较好。在沈阳地区冬季,一般的塑料立壕子,夜间覆盖一层草苫,可比不覆盖的增温3.6～10.1℃;覆盖草苫加纸被(4层牛皮纸制成),可增温8.9～16.3℃。
The use of greenhouses, greenhouses in the winter and spring production of fresh vegetables, how to maintain the proper temperature within the shed is the primary issue. The current production of several commonly used insulation measures are the following types. 1 shed cover: in the cold season, at night with grass, paper, quilts and other covered in the shed outside the light, and then opened in the morning after the sun opened in time, so that shed lighting. This method is simple and easy, thermal insulation effect is better. Winter in Shenyang, the general plastic vertical trenches covered with a layer of grass at night, than non-covered warming 3.6 ~ 10.1 ℃; covered with grass and paper plus (4 layers of kraft paper made), an increase of 8.9 ~ 16.3 ℃.