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对天津市部分区县菜田土壤的分析结果表明，温室、大棚内０～２０ｃｍ、２０～４０ｃｍ土壤ＮＯ－３含量与全盐量的相关性分别达到极显著水平；而露地０～２０ｃｍ土壤两者的相关性达显著水平，２０～４０ｃｍ土壤的相关性极差。从定点观测的结果可以看出，春季露地表层土壤（０～３ｃｍ）的全盐量明显高于大棚土壤，其它土层差异较小。
The results of soil analysis of vegetable fields in some districts and counties in Tianjin showed that the correlation between NO-3 content and total salt content in 0-20 cm and 20-40 cm soil layers in greenhouse and canopy reached extremely significant level respectively. The correlation was significant, and the correlation was very poor in 20-40 cm soil. From the results of fixed-point observations, it can be seen that the total salinity of surface soil (0 ~ 3cm) in spring is obviously higher than that of greenhouse soil, while the difference in other soil layers is small.