Agriculture 12 Arid regions agriculture 7 Deserts 6 Forestry 5 Geomorphology 4 Natural Resource Economics, (New March 2000) 4 Natural resources 4 Sustainable agriculture 4 Sustainable development 4 Water conservation 4 Agricultural chemistry 3 Arid regions 3 Desertification 3 Economics 3 Irrigation 3 Physical geography 3 Policy and Planning 3 Watershed management 3 Agencies and Organizations 2 Agricultural Economics 2 Agricultural economics 2 Agricultural production 2 Agricultural resources 2 Agroforestry 2 Arid 2 Arid Lands 2 Arid lands 2 Arid regions ecology 2 Biodiversity 2 Community Participation and Development, (New March 2000) 2