崂山县1973年引进塑料大棚蔬菜栽培技术,到1976年仅建起30余亩塑料大棚,发展较慢。其重要原因之一是只在春季扣棚,一年一茬黄瓜,大棚利用率很低,产量、产值低而不稳,影响了塑料大棚蔬菜生产的发展。1978年全县推广应用了“塑料大棚内蔬菜多茬栽培技术”。即:早春利用塑料大棚进行喜温性蔬菜促成栽培,较露地提前一个半月上市,晚秋进行延迟栽培,可延长供应 Laoshan County in 1973 to introduce plastic greenhouse vegetable cultivation techniques, to 1976, only built more than 30 acres of plastic shed, the development of slower. One of the important reasons is that only in the spring buckets, cucumbers a year, low utilization of greenhouses, production, low and unstable output value, affecting the development of plastic greenhouses vegetable production. In 1978 the county to promote the use of “plastic greenhouse cultivation of vegetables in more technology.” Namely: Early spring use of plastic greenhouses for temperature-friendly vegetables to promote cultivation, compared with a half months ahead of the market, delayed cultivation late in the autumn, can extend the supply