1. Ph.D student, Dept of SS & Ac, UAS, GKVK, Bangalore-65 2. Professor & Head, Dept. of SS & AC, UAS, GKVK, Bangalore-65 3. Associate Professor, Dept. of SS & AC, UAS, GKVK, Bangalore-65 4. Associate Professor, Dept. of Agron. UAS, GKVK, Bangalore-65 An investigation was taken up to know the ground water quality parameters in Hassan District of Karnataka under different land use cover. A total of thousand ground water samples in eight taluks of Hassan district were collected during the year 2003-04. This includes a total of hundred samples from each land use cover viz., Potato, Coconut, Ragi, Coffee and vegetable were collected in two seasons that is before rainy season (March-April) and after rainy season(October-November) and analyzed for their chemical composition. Water quality parameters viz., SAR and RSC were worked out cased on which the ground water samples were classified for their suitability for irrigation. The pH of groundwater samples were with in permissible limits except for few samples. EC of ground water samples were C1 and C2 type in Belur and Sakaleshpur taluks, where as in other taluks EC was C2 and C3 types in both before and aftyer rainy season. Among all the anion Bicarbonate is the dominant anion followed by Chlorides, Nitrate, Sulphate, Carbonate and Boron. Where as among cation Sodium was predominant cation followed by calcium and magnesium. Sodium concentrations of ground water sample of Channarayapattana taluk was high compared to other taluks. Few ground water samples under different land use cover viz, Potato, Coconut, Ragi, Coffee and vegetables had the problem of salinity and alkalinity. Good harvests are obtained with these waters as the soil of the area generally sandy loam to clay loam in structure. Correlation study revealed that pH and EC of ground water samples had a positive and significant relationship with chemical constituents and SAR of ground water samples in both before and after rainy seasons.