Water conservation Soil conservation 13 Irrigation 12 Water 8 Water resources development 6 Water-supply 5 Watershed management 5 Erosion: Soil and Water Conservation 4 Water Resources 4 Water use 4 irrigation 4 Land degradation 3 Nanotechnology 3 Natural Resource Economics, (New March 2000) 3 Water quality management 3 Water resources 3 Water-supply, Agricultural 3 Watersheds 3 Agricultural Economics 2 Agricultural development 2 Aquatic ecology 2 Aquatic resources conservation 2 Erosion 2 India 2 Land Resources 2 Land use 2 Land use-Management 2 Models 2 Plant conservation 2 Policy and Planning 2