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- nitrogen[remove]2
- phosphorus2
- rivers[remove]2
- water quality2
- Soil and Water Assessment Tool model1
- agricultural watersheds1
- ammonia1
- computer analysis1
- mathematical models1
- nitrates1
- nonpoint source pollution1
- nutrients1
- pollutants1
- runoff1
- seasonal variation1
- sediment transport1
- simulation models1
- storms1
- stream flow1
- surface water1