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- Soils 25
- Agriculture 19
- Irrigation 13
- Watersheds 13
- Water quality 9
- Salinity 7
- Climate 5
- Technology 4
- Drainage 3
- Evapotranspiration 3
- Groundwater 3
- Hydrology 3
- Precipitation (Meteorology) 3
- Sand 3
- Aswan High Dam (Egypt) 2
- Erosion 2
- Fertility 2
- Reclamation of land 2
- Algae 1
- Bureaucracy 1