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通过3 a 6季作物收获后测定不同施肥方式下潮土1 m土层中的硝态氮，结果表明无论是0～20 cm、80～100 cm还是0～100 cm土层，其硝态氮含量顺序均是N＞NK＞NP＞NPK＞SNPK＞MNPK；0～20 cm土层中硝态氮相对值随降雨量增大而减小，降水量大则硝态氮向下淋溶较多；施有机肥或秸秆还田有减轻淋溶的作用。0～60 cm土层中硝态氮相对值在测定时期及处理之间差异均不显著。
The results showed that the nitrate nitrogen in 1 m soil layer under the different fertilization modes was 0 ~ 20 cm, 80 ~ 100 cm or 0 ~ 100 cm after harvesting for 3 years and 6 months. The nitrate nitrogen The order of nitrate nitrogen content was N> NK> NP> NPK> SNPK> MNPK. The relative value of nitrate nitrogen in 0-20 cm soil layer decreased with the increase of rainfall, ; Organic manure or straw to reduce the role of leaching. The relative values of nitrate nitrogen in 0 ~ 60 cm soil layer were not significantly different between the determination period and the treatment.