OpenAGRICOLA
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- agricultural watersheds[remove]17
- drainage water[remove]17
- nonpoint source pollution8
- phosphorus8
- water pollution8
- losses from soil7
- nitrogen7
- agricultural runoff6
- nitrate nitrogen6
- AgSpace5
- tile drainage5
- corn4
- nitrogen fertilizers4
- streams4
- surface water4
- econometric models3
- fertilizer rates3
- leaching3
- nutrient management3
- pollution control3