An evaluation method of soil integrated fertility was developed and us ed in the Houhu farm
enterprise, with soil fertility
being considered as a comp lex of the state of soil nutrients and the capacity to regulate and transform th e materials needed by plants. With systematic principle and the soil data of the Houhu farm
enterprise, 9 indexes were divided into two groups representing sep arately states of soil nutrients and environments of nutrients supplying, includ ing content of total N, total P 2O 5, total K 2O, available P 2O 5, availab le K 2O, pH, physical clay, silt-clay ratio and thickness of soil surface lay er ( epipedon). Then two types of membership functions of these indexes, S-type and parabola-type, were developed based on their effects on plants. Their valu es of function were also calculated. Through factor analysis of these values wit h the Analytical Hierarchy Process (AHP), weight values of these indexes were decided. Finally, with Analytical Clustering Process (ACP), soils
fertility was divided into 5 classes in this area. With GIS software MAPGIS, the map of soil c omprehen sive fertility in the Houhu farm enterprise area was drawn. The soil f ertility in this region was mainly in 1,2 classes, and area of soils in 1,2,3,4 ,5 classes amounts 24.25%,52.34%,11.20%,6.15% and 6.06% respectively.