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- Salinity 37
- Irrigation 18
- Agriculture 13
- Water quality 12
- Groundwater 8
- Technology 8
- Drainage 6
- Soils 6
- Hydrology 5
- Finance 4
- Bureaucracy 3
- Dams 3
- Rain and rainfall 3
- Reclamation of land 3
- Watersheds 3
- Aquifers 2
- Economics 2
- Industries 2
- Politics and government 2
- Waterlogging (Soils) 2