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Table 1 Different methods of soil carbon determination used in referred authors

From: Advances in quantifying soil organic carbon under different land uses in Ethiopia: a review and synthesis

Methods* Number of observations Percentage proportion (%)
Ex-situ methods:
 1. Walkley and Black Method
 (Wet oxidation or combustion)
21 58.2%
 2. Dry combustion method: CN analyser 9 25%
 3. Dry combustion: weight-loss-on-ignition 2 5.6%
In-situ methods (in combination with Ex-situ methods):
 4. Isotope ratio mass spectrometer 1 2.8%
 5. Dry combustion coupled Infra-red spectroscopy
 Isotope mass spectrometer
2 5.6%
 6. Walkley and Black Method coupled
 Reflectance spectrometer
1 2.8%
Total 36 100
  1. *See Appendix for details