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- Glycine max4
- Zea mays4
- crop rotation[remove]4
- leaching4
- nitrate nitrogen[remove]4
- water quality4
- application rate3
- herbicide residues3
- nitrates3
- Management Systems Evaluation Areas2
- Triticum aestivum2
- alachlor2
- atrazine2
- demonstration farms2
- groundwater contamination2
- low input agriculture2
- no-tillage2
- research projects2
- ridging2
- tillage2