春季,我国北方塑料大棚蔬菜常遇低温发生冻害,1987年我们开始研究塑料大棚蒸汽防冻技术.蒸汽防冻就是在出现低温时,使大棚内充满水蒸汽,靠水蒸汽的覆盖等作用防止蔬菜发生冻害.一、研究方法利用晚秋和早春的自然低温,采用大棚 In spring, vegetables in northern China often suffer cold damage in low temperature. In 1987, we started to study the technology of plastic antifreeze in greenhouse, which is to make the greenhouse full of water vapor at low temperature and to prevent freezing damage of vegetables by water vapor coverage First, the research method uses late autumn and early spring natural low temperature, the use of greenhouses