OpenAGRICOLA
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- agricultural watersheds1
- ammonium nitrogen[remove]1
- animal manure management[remove]1
- cattle manure1
- composted manure[remove]1
- composting1
- dairy cattle1
- nitrate nitrogen1
- nitrites1
- phosphorus1
- pollution control1
- streams1
- total maximum daily load1
- water pollution[remove]1
- water quality1