Rubber Research Institute of India (RRII), Rubber Board in collaboration with National Bureau of Soil Survey and Land Use Planning (NBSS & LUP), ICAR undertook a detailed survey of rubber growing soils of South India with an objective to bring the entire rubber area in the country within the ambit of soil test based fertilizer recommendation. Soil samples were also collected using core samplers to determine the gravel content. Location coordinates of sites of soil samples were recorded by GPS.