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- AgSpace[remove]4
- Triticum aestivum[remove]4
- Zea mays[remove]4
- agricultural runoff[remove]4
- Glycine max3
- ammonium nitrogen3
- corn3
- crop residues3
- losses from soil3
- nitrate nitrogen3
- nitrogen3
- phosphorus3
- soybeans3
- winter wheat3
- nonpoint source pollution2
- phosphates2
- pollution control2
- wheat straw2
- adsorption1
- application rate1