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试验利用电导法在稳态供水条件下，对不同粒级土壤中溶质的移动及其施肥土壤中Ｎ的向下迁移过程及迁移数量进行定性和定量研究，讨论了土壤颗粒大小对土壤持肥、持水特征的影响，并揭示了不同粒级土壤中溶质Ｎ的迁移与水分运动的关系。根据渗出液的电导率与其ＮＯ－３－Ｎ含量之间关系：ｙ＝０．２３６＋０．００５ｘ，估算出各粒级土壤中加入的肥料Ｎ的淋溶量。结果表明：土壤的持肥、持水特征，以及Ｎ的迁移和水分运动与土壤颗粒组成有关。一般持水性较高的粒级（如＜０．３ｍｍ），其持肥能力亦较强，但饱和导水率较低，溶质Ｎ的迁移速度也比较缓慢。本试验旨在为土壤耕作和培肥、改善土壤结构、提高土壤持肥持水能力提供有关参考依据
In this paper, the steady state water supply conditions were used to conduct qualitative and quantitative studies on the movement of solutes in different fractions of soil and the downward migration process of N in the fertilization soil. The effects of soil particle size on soil nutrients, Holding water characteristics, and reveals the relationship between solute N migration and water movement in different soil fractions. According to the relationship between the conductivity of the effluent and its NO-3-N content: y = 0.236 + 0.005x, the leached amount of fertilizer N added to each particle size soil was estimated. The results showed that soil nutrients, water holding characteristics, N migration and water movement were related to soil particle composition. Generally higher water-holding fraction (such as <0.3mm), its ability to hold fertilizer is also strong, but lower saturated hydraulic conductivity, solute N migration speed is relatively slow. The purpose of this experiment is to provide references for soil cultivation and fertilization, soil structure improvement and soil fertility and water holding capacity