Soil samples from Madhalli sub-watershed in northern dry zone of Karnataka were drawn at 250 m grid intervaland assessed for their fertility parameters. Analytical data was interpreted and statistical parameters like range, meanstandard deviation 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 strongly alkaline with non saline to slightsalinity. Soil organic carbon content was low to medium. Available nitrogen was low, available phosphorus was low tomedium, available potassium was medium to high and sulphur was low to medium. Regarding available micronutrients, zincand iron were deficient in about half of the sub-watershed area whereas, copper and manganese were sufficient in the soils.The mapping of nutrients by GIS technique in the sub-watershed revealed that, available N, P, S, Zn and Fe are importantsoil fertility constraints