OpenAgricola
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- AgSpace[remove]2
- agricultural watersheds[remove]2
- watersheds[remove]2
- Soil and Water Assessment Tool model1
- USDA1
- agricultural runoff1
- atrazine1
- conservation practices1
- conservation programs1
- cropping systems1
- data analysis1
- databases1
- erosion control1
- hydrologic data1
- lakes1
- longitudinal studies1
- no-tillage1
- pollution load1
- precipitation1
- rivers1