| Based on the principle of hiberarchy analysis and fuzzy mathematics and the technique of GIS,the integrated evaluation of soil fertility was studied with five indexes, including organic mater, alkali-hydrolysis N, available P, available K and the quality of surface soil. The subjective grade value was calculated according to the S-type subjective grade function of crop effect, and the weight value of the fertility indexes was calculated by the method of hiberarchy analysis. Then the Integrative Fertility Index (IFI) was calculated. The evaluation results could be applied in scientific fertilization services. |