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. Author manuscript; available in PMC: 2018 Apr 13.
Published in final edited form as: Soil Sci Soc Am J. 2016 Jun 24;80(3):613–622. doi: 10.2136/sssaj2015.11.0414

Fig. 5.

Fig. 5

Diffuse reflectance Fourier-transform infrared spectrum of the Inceptisol soil without biochar addition at the beginning of the experiment (D0). Spectrum A corresponds to the original spectrum, Spectrum B is the baseline used to correct Spectrum A, calculated using a quartic polynomial function to correct the spectrum with x axis points (3227, 3212, 3184, 3154, 3132, 3006, 2796, 2785, 2768, 2749, 2695, and 2655). Spectrum C is the resulting baseline-corrected spectrum (expanded 2×). The aromatic and aliphatic regions are indicated, and the areas of these two regions represent the Ar/Al ratio.