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- agricultural watersheds[remove]2
- nonpoint source pollution2
- pastures2
- phosphorus2
- water quality2
- AgSpace1
- Conservation Effects Assessment Project1
- Soil and Water Assessment Tool model1
- agricultural runoff1
- ammonium nitrogen1
- buffering capacity1
- hydrochemistry1
- land use change1
- losses from soil1
- nitrate nitrogen1
- nitrogen1
- pasture management1
- pollution control1
- sediment yield1
- sediments1