Soil conservation Land use 12 Water conservation 10 Soil erosion 9 Periodicals 8 Soils 5 Reclamation of land 4 Soil degradation 4 Agricultural conservation 3 Agriculture 3 Congresses 3 Conservation of natural resources 3 Government policy 3 Land degradation 3 Natural resources 3 Planning 3 Soil management 3 Citizen participation 2 Control 2 Drainage 2 Economic aspects 2 Environmental aspects 2 History 2 Hydraulic engineering 2 Land use, Rural 2 Nature conservation 2 Shrubs 2 Soil reclamation 2 Trees 2 Water resources development 2