A field study was conducted during kharif 2014 and rabi 2014-15 at Southern Transition Zone of Karnataka under the jurisdiction of University of Agricultural Sciences, GKVK, Bangalore, India to know the spatial variability for available nutrient content in cultivator’s field and effect of site specific nutrient management in maize. The farmer’s fields have been delineated with each grid size of 50 m x 50 m using geospatial technology. Soil samples from 0-15 cm were collected and analysed for major nutrients in all the selected 694 grids. Soils varied spatially for soil pH (5.62 to 7.65), organic carbon (0.35 to 0.65 %) and available NPK (219 to 480 kg N, 15.2 to 48.7 kg P2O5 and 144 to 189 kg K2O ha-1). This was managed through site specific nutrient management (SSNM) strategy. SSNM plots recorded higher maize grain yield during kharif and rabi seasons (9.56 and 9.46 Mg ha-1, respectively) as compared to farmers practice (7.94 and 8.01 Mg ha-1, respectively) which was 20.40 and 18.18 per cent higher yield respectively. The increased yield was mainly attributed to increased growth and yield parameters.
