Water conservation 146 Irrigation 31 water conservation 19 Soil conservation 18 Soil and water conservation 11 Erosion: Soil and Water Conservation 9 WATER CONSERVATION 8 Water 8 Erosion 7 Water-supply 7 Pollution and Degradation 6 Water resources development 6 Water use 6 Watershed management 6 Water Resources 5 Land degradation 4 Natural Resource Economics, (New March 2000) 4 Soil Chemistry and Mineralogy 4 Soil Fertility 4 Soil conservation-India 4 Soil fertility 4 Soil management 4 Soil types 4 Water Conservation 4 Water conservations 4 irrigation 4 Agricultural development 3 Agroforestry 3 Dissertations, Academic (Ph.D) 3 Drainage 3