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本试验以菜田露地土壤为对照，调查分析了京郊１０年以上蔬菜大棚土壤的各种营养成分、电导度值和阴阳离子浓度等。试验结果：老大棚内土壤的电导度值在０．１６９～０．６９４ｍｓ／ｃｍ之间，土壤全盐含量在 ０．０８％～０．１６％之间。此结果表明：京郊种植多年的蔬菜大棚内土壤基本上不存在盐分离子积聚的危害。
In this study, the open field soil as a control, the investigation and analysis of the suburbs of Beijing suburbs of more than 10 years of greenhouse vegetable nutrition, conductivity and anion concentration. The results showed that the electrical conductivity of the soil in the old greenhouse was between 0.169 and 0.694 ms / cm, and the soil total salt content was between 0.08% and 0.16%. The results show that there is basically no harm of salt ion accumulation in the soils grown in the greenhouse in the suburbs of Beijing for many years.