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- Environmental Protection Agency1
- Glycine max2
- Quercus rubra1
- Sorghum bicolor1
- Triticum aestivum1
- Zea mays2
- agrochemicals1
- alachlor3
- animal manures1
- application rate4
- application timing1
- arable soils2
- atrazine5
- calibration1
- claypan soils1
- conservation tillage1
- cost analysis1
- costs and returns2
- crop management1
- crop production2