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- Oxisols[remove]1
- carbon1
- cerrado[remove]1
- conventional tillage1
- electron paramagnetic resonance spectroscopy1
- fluorescence1
- fluorescence emission spectroscopy1
- homogenization1
- humic acids1
- humification1
- indigenous species1
- iron1
- long term experiments1
- no-tillage1
- nuclear magnetic resonance spectroscopy1
- plant residues1
- soil organic matter1
- soil sampling1
- stable isotopes1