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- Agriculture 5
- Watersheds 5
- Irrigation 4
- Precipitation (Meteorology) 4
- Groundwater 3
- Hydrology 3
- Arid regions 2
- Desertification 2
- Livestock 2
- Rain and rainfall 2
- Water conservation 2
- Water quality 2
- Brackish waters 1
- Crops 1
- Dry farming 1
- Furrow irrigation 1
- Jordan 1
- Minṭaqat al-Ghāb (Syria) 1
- Rangelands 1
- Salinity 1