An investigation was undertaken at, Department of Soil Science and Agricultural Chemistry, College of Agriculture, UAHS, Shivamogga to a study of selected carbon fractions in soil under Areca nut based cropping systems of coastal zone (10) of Karnataka. Among the cropping systems studied, arecanut + mixed recorded higher mean potassium permanganate oxidizable organic carbon( kg-1 ), cold water extractable carbon ( kg-1 ), total carbon ( g kg-1 ), total organic carbon ( kg-1 ), total inorganic carbon ( kg-1 ) and soil microbial biomass carbon ( kg-1 ) fractions as compared to other cropping systems and decreases with lower depth and carbon fractions were higher in 0-30cm soil depth. | A study of selected carbon fractions in soil under arecanut based cropping systems of coastal zone of Karnataka