Soilsamples from Dudihalsub-watershed in northern dry zone of Karnataka were drawn at 250 m grid interval andassessed for their fertility parameters. Analytical data was interpreted and statistical parameters like range, mean standarddeviation and coefficient of variation were calculated for each parameter. Soil fertility maps were prepared for eachparameter under GIS environment using Arc GIS v 10.4. Soils were neutral to very strongly alkaline with non saline to slightsalinity. Soil organic carbon content was low in 74.67 percent of TGA and medium in 22.77 per cent of TGA. Availablenitrogen was low in entire sub watershed, whereas, available phosphorus was medium in the sub watershed, availablepotassium was high in the entire sub watershed and sulphur was medium in 85.18 per cent of TGA andhigh in 12.26 per centof TGA of the sub watershed. Among the DTPA extractable micronutrients, available zincwas deficient in 81.82 per cent ofthe study area and sufficient in 15.62 per cent of the area and ironwere deficient in the entire sub watershed area whereas,copper and manganese were sufficient in the soils of sub watershed. The mapping of nutrients by GIS technique in the subwatershed revealed that, OC, available N, Zn and Fe are important soil fertility constraints.