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褐土区 １９ 年长期施肥定位试验，在 ９ 个不同处理 ＣＫ，Ｍ，Ｎ１ ，Ｎ２ ，Ｐ１ ，Ｎ１ Ｐ１，Ｎ２Ｐ１，Ｎ２Ｐ２和 Ｎ２Ｐ２Ｋ 中，以 ０～２０，２０～４０，４０～６０，６０～８０，８０～１００ｃｍ 分五层垂直取土样，然后进行室内分析，ＮＯ３－ －Ｎ 用酚二潢酸比色法测定，作物产量以小区单打单收计产，探讨了单施有机肥、氮肥及氮磷、氮磷钾配施对作物产量和土壤剖面中 ＮＯ３－ －Ｎ 的垂直分布及 ０～１００ｃｍ 土体中ＮＯ３ － －Ｎ 累积量的影响。结果表明：氮磷或氮磷钾以适宜用量和比例配合施用使小麦、玉米产量高且稳定性好，其产量波动的变异系数小，分别比对照处理减少变异系数 ０．２６０～０．２７２ 及０．１９１～０．１９５。同时可以减少土体中ＮＯ３ － －Ｎ 的积累，减少对环境的污染。９ 个处理中以单施磷肥处理０～１００ｃｍ 土体中”ＮＯ３－ －Ｎ 含量最少。Ｎ２ 处理０～１００ｃｍ 土体中ＮＯ３ － －Ｎ 含量最高
After 19 years of long-term fertilization experiment in the cinnamon soil area, 0, 20, 20, 40, 40, 60, 60, 80,80 ~ 100cm sub-five vertical take soil samples, and then for indoor analysis, NO3- -N phenol secondary anion acid colorimetric determination of crop yield to singles count plots plot to discuss the application of organic fertilizer, nitrogen fertilizer And the effects of N and P, NPK fertilizers on crop yield and vertical distribution of NO3- -N in soil profile and NO3 - -N accumulation in 0-100 cm soil. The results showed that the yield coefficients of nitrogen and phosphorus or nitrogen, phosphorus and potassium fertilizers were increased and the yield of wheat and maize were higher than those of the control. The coefficients of variation were 0.260 ~ 0.272 and 0.191 ~ 0.195. At the same time, it can reduce the accumulation of NO3 - -N in the soil and reduce the pollution of the environment. Among the 9 treatments, the content of NO3- -N was the least in 0-100 cm soil treated with phosphate alone, while the content of NO3- -N in 0-100 cm soil with N2 treatment was the highest