Irrigation Soil Water Management (Irrigation and Drainage), (Revised June 2002) 12 Water conservation 12 Agriculture 11 water conservation 11 Water Resources 9 Drainage 8 Plant Production 7 Water management 7 Climate 6 Economics 6 Crop production 5 Management 5 Meteorology and Climate 5 Water resources development 5 Crop yield 4 Cultivation 4 India 4 Irrigation systems 4 Irrigation water 4 Plant protection 4 Soil Fertility 4 Surveying 4 Water supply 4 Water use 4 soil moisture 4 water management 4 Crop Produce 3 Crop quality 3 Dams 3