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. 2017 Jul 24;7:6317. doi: 10.1038/s41598-017-06654-6

Figure 5.

Figure 5

Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) for the samples with the highest residue addition rate treatments after incubation for 105 days (a). Signal intensities of C–H groups (b), C=O groups (c), C=O or C=C groups (d) and C=C or N–H groups (e).