通过对黄土高原土壤系统熵研究，发现土壤起始熵不仅可以反映土壤肥力高低，而且可以反映土壤的适种性；生产投入熵可用来确定投入化肥的能量转换效率以及估侧作物的最佳施肥量，并为化肥在不同肥力土壤上的合理分配提供依据。以土壤起始熵判断出黄土高原土壤肥力高低顺序是土＞黑垆土＞栗钙土＞灰钙土＞黄绵土。 Through the study on soil systematic entropy of the Loess Plateau, it is found that the initial entropy of soil can not only reflect the soil fertility but also reflect the soil suitability. The input entropy of production can be used to determine the energy conversion efficiency of fertilizers and the optimal fertilization Quantity, and provide the basis for the rational distribution of fertilizers on different fertility soils. The order of soil fertility in loess plateau was judged by soil initial entropy as soil> black soil> chestnut soil> gray soil> yellow soil.