在潮土长期不同施肥定位试验中，在８个不同处理中，以０ｃｍ～２０ｃｍ，２０ｃｍ～４０ｃｍ，４０ｃｍ～６０ｃｍ，６０ｃｍ～８０ｃｍ，８０ｃｍ～１００ｃｍ分五层垂直取土样，然后进行室内分析，ＮＯ－３－Ｎ用苯二潢酸比色法测定结果。作物产量以各小区单收计产。探讨了Ｎ、Ｐ、Ｋ配施及有机肥与Ｎ、Ｐ、Ｋ配合施用对作物产量和土壤剖面ＮＯ－３－Ｎ的垂直分布及０ｃｍ～１００ｃｍ土体中ＮＯ－３－Ｎ累积数量的影响。结果表明，潮土区域中ＮＰＫ配施是潮土区中粮田持续高产稳产的有效措施，各处理中以ＮＰＫ处理０ｃｍ～１００ｃｍ土体中ＮＯ－３－Ｎ含量最少。ＮＯ－３－Ｎ在各土体中垂直分布均是由上而下在减少 In the long-term fertilization experiment with different soil depths, soil samples were taken vertically from five layers of 0cm ~ 20cm, 20cm ~ 40cm, 40cm ~ 60cm, 60cm ~ 80cm and 80cm ~ 100cm in eight different treatments. NO-3-N phenyl diphenolate colorimetric determination of the results. Crop yield to yield a single crop of each district. The effects of N, P and K fertilizers combined with N, P and K fertilizers on crop yield and vertical distribution of NO-3-N and soil NO-3-N accumulation in 0cm ~ 100cm soil were discussed. . The results showed that NPK application in the tidal zone was an effective measure to maintain high and stable grain yield in the tideland. The content of NO-3-N in 0-100 cm soil was the least in each treatment. The vertical distribution of NO-3-N in all soils is decreasing from top to bottom