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Topic
- Soils 88
- Agriculture 58
- Watersheds 50
- Irrigation 46
- Water quality 21
- Climate 19
- Groundwater 18
- Hydrology 16
- Precipitation (Meteorology) 16
- Salinity 13
- Technology 11
- Water consumption 10
- Drainage 9
- Economics 7
- Finance 6
- Demography 5
- Erosion 5
- Evapotranspiration 5
- Fertilizers 5
- Rain and rainfall 5
