Water Resources 8 Water management 8 Soil Water Management (Irrigation and Drainage), (Revised June 2002) 5 Water resources 5 Water use 5 Natural Resource Economics, (New March 2000) 4 Sustainability 4 more ... Water in agriculture 4 Water-supply, Agricultural 4 Agriculture 3 Irrigation 3 Irrigation water 3 Land Resources 3 Social Psychology and Social Anthropology, (New March 2000) 3 Agricultural development 2 Aquaculture 2 Aquaculture (Animals) 2 Coastal zone management 2 Dry farming 2 Economic aspects 2 Ecosystems 2 Environmental degradation 2 Environmental management 2 Fisheries 2 Food Economics, (New March 2000) 2 Food security 2 General 2 Groundwater 2 Land management 2 Land use 2 less ...