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- AgSpace[remove]3
- agricultural land[remove]3
- herbicide residues2
- metolachlor2
- Economic Research Service1
- Glycine max1
- Zea mays1
- agricultural soils1
- agricultural watersheds1
- agriculture1
- arsenic1
- atmospheric deposition1
- atrazine1
- base flow1
- basins1
- best management practices1
- carbon dioxide1
- carbon sequestration1
- chlorophyll1
- chlorothalonil1