Soil fertility evaluaion for wheat cultivation by fuzzy theory approache and compared with boolean method and soil test method in gis area

The main purpose of this study is to prepare soil fertility maps for Wheat using Fuzzy classification in Zarghan area، Fars province. In the present study، seven soil parameters، such as Copper (Cu)، Iron (Fe)، Manganese (Mn)، Zinc (Zn)، Organic mater (OC)، Potassium (K)، Phosphor (P) are chosen for fertility analysis and thematic maps are developed for each of the parameters with IDW model. Different Fuzzy membership functions obtained from the literature were employed and the weights for each parameter were calculated according to an Analytic Hierarchy Process (AHP) that relies on pair wise comparisons. The results with the Fuzzy theory showed 17% of the study area as highly fertility for wheat 40 % as moderately fertility، 13% as weak fertility. For determine accuracy soil fertility map used kappa coefficient. Based on the results it has been concluded that Fuzzy method allows obtaining results that seems to be corresponded with the current conditions in the area.