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- AgSpace[remove]36
- nitrate nitrogen15
- corn13
- simulation models12
- Zea mays11
- agricultural watersheds11
- losses from soil11
- subsurface drainage10
- nitrogen fertilizers9
- soybeans9
- tile drainage9
- watersheds9
- water pollution8
- Glycine max7
- drainage water7
- hydrologic models7
- agricultural soils6
- fertilizer application6
- fertilizer rates6
- nitrogen6