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系统地研究了温室、大棚、露地土壤的理化性质、生物学性状、土壤盐分组成及动态变化。认为：土壤硝酸盐积累是保护地栽培蔬菜生理障碍的主导因子；根据残留硝态氮数量控制氮肥施用，是防止保护地土壤次生盐渍化和硝酸盐污染环境最有效的措施。同时，对硝酸盐危害蔬菜生长的机理进行了探讨。
The physical and chemical properties, biological characteristics, soil salt composition and dynamic changes of greenhouse, greenhouse and open soil were systematically studied. It is considered that the accumulation of nitrate in soil is the dominant factor in the physiological barriers of cultivated vegetables in protected areas. Controlling the application of nitrogen fertilizer according to the amount of residual nitrate is the most effective measure to prevent secondary salinization of soil and nitrate pollution in protected areas. At the same time, the mechanism of nitrate endangering the growth of vegetables was discussed.