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长期定位试验和调查取样的结果表明，土壤中NO3--N的累积量随有机肥施用量的增加而增加，过量施用有机肥会引起2 m以下深层次土壤中NO3--N的大量累积。当有机肥和无机肥配合施用时，土壤中NO3--N的累积量随总施N量的增加而增加。有机肥对土壤NO3--N累积的影响和对地下水的潜在威胁不容忽视。
The results of long - term experiment and sampling showed that the accumulation amount of NO3 - N in soil increased with the increase of organic fertilizer application. Over - application of organic fertilizer could cause the accumulation of NO3 - N in deep soil below 2 m. When combined with organic manure and inorganic fertilizer, the accumulation of NO3 - N in soil increased with the increase of N application rate. The Effect of Organic Manure on NO3 - N Accumulation in Soil and Potential Threat to Groundwater can not be ignored.