OpenAGRICOLA
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- water pollution[remove]24
- watersheds[remove]24
- water quality16
- simulation models8
- surface water8
- atrazine7
- streams7
- geographic information systems6
- nonpoint source pollution6
- runoff6
- herbicide residues4
- losses from soil4
- nitrate nitrogen4
- nitrates4
- agricultural land3
- agrochemicals3
- application rate3
- economic analysis3
- groundwater contamination3
- monitoring3