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1999年3月河北农业大学蔬菜’专业赴青县实习,对青县塑料大棚蔬菜生产进行了详细调查。青县大棚黄瓜采用多层覆盖技术,上市期比普通大棚提早近1个月。大棚黄瓜生产已成青县蔬菜生产的支柱产业。年产黄瓜8.7亿公斤,平均亩产6000公斤,亩产值达8000元左右。一、大棚结构青县塑料大棚多为竹木结构,单棚面积较大,一般为1000～1500平方米。采用4层膜覆盖技术,外膜为长寿无滴膜,一般用三幅膜覆盖,
March 1999 Hebei Agricultural University professional green went to practice in Qingxian Qingxuan plastic greenhouse vegetable production conducted a detailed investigation. Qingxiao greenhouse cucumber using multi-layer covering technology, listing period than ordinary shed nearly 1 month. Greenhouse cucumber production has become a green vegetable production pillar industries. With an annual output of 870 million kilograms of cucumbers, the average yield of 6000 kg, mu output value of about 8,000 yuan. First, the greenhouse structure Qingxian plastic shed mostly bamboo structure, single shed larger, usually 1000 to 1500 square meters. Using 4-layer membrane covering technology, the outer membrane is long-life drip-free membrane, generally covered by three membranes,