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- Salinity 49
- Agriculture 25
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- Groundwater 19
- Water quality 19
- Watersheds 13
- Soils 12
- Drainage 10
- Hydrology 10
- Technology 8
- Aquifers 7
- Finance 7
- Politics and government 5
- Precipitation (Meteorology) 5
- Bureaucracy 4
- Climate 3
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- Evapotranspiration 3
- Microirrigation 3
- Rain and rainfall 3