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调查结果表明，化肥或有机肥的过量施用，都会引起蔬菜地土壤ＮＯ－３－Ｎ的大量累积。关中地区蔬菜地土壤ＮＯ－３－Ｎ０～４ｍ土层大于５００ｋｇ／ｈｍ２和１～４ｍ土层大于１０００ｋｇ／ｈｍ２的分别占调查地块的６０％和２７．６％，淋洗到１ｍ以下的大于５００ｋｇ／ｈｍ２的占调查地块的５１．７％。
The results show that excessive application of chemical fertilizers or organic fertilizers can cause a large accumulation of NO-3-N in vegetable soils. In the area of Guanzhong vegetable soil NO-3-N0 ~ 4m soil layer is greater than 500kg / hm2 and 1 ~ 4m soil layer is greater than 1000kg / hm2 accounted for 60% and 27.6% of the survey plots, leaching to less than 1m greater than 500kg / hm2 accounted for 51.7% of the survey plots.