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从澄城、杨陵两地田块均匀多点采取的土样测定结果表明，土壤有机质、硝态氮、铵态氮和水分具有很大的变异性，这种变异性不仅表现在水平方向，也表现在垂直方向，但不同养分在垂直方向上的变异规律不尽相同。因此，在一定精度要求和误差范围内，相同养分在不同土层中的样品容量也不完全相同。只有根据误差理论确定出每层所需的样品容量，才能保证不同土层间的测定结果具有相互可比性。这一研究结果，对指导合理取样和决定样品容量，准确评价不同土层的养分含量，以及研究养分的动态变化等具有一定的参考价值。
The results of soil samples taken from Chengcheng and Yangling plots showed that the soil organic matter, nitrate nitrogen, ammonium nitrogen and water had great variability, which not only showed in the horizontal direction but also in the horizontal direction Performance in the vertical direction, but different nutrients in the vertical direction of the variation of different. Therefore, within a certain accuracy requirements and error range, the same nutrients in different layers of soil sample size is not exactly the same. Only by the error theory to determine the required sample size for each layer, in order to ensure that the results of different soil layers with each other comparable. The results of this study have some reference value to guide the rational sampling and determine the sample capacity, accurately evaluate the nutrient content of different soil layers, and study the dynamic changes of nutrients.