Dr Velumani Ravi is the Principal Scientist, Director, ICAR-Central Tuber Crops Research Institute, Trivandrum, Kerala . He is into tropical tuber crops cassava/tapioca, sweet potato, elephant foot yam, yams, taro, tannia, arrow root, (other than potato), area of cultivation, varieties, agro techniques, drought management, cultivation practices, potential yield, nutrient requirement, irrigation requirement, nutritive value, biofortified varieties, economic importance, planting materials , storage of planting materials, tuber crops based cropping systems.