Figure 6: Principal component regression (PCR) of data from the 13C-CP/MAS-NMR and FTIR spectra and the root parameters of plant bioactivity.
(A, B) Humic acids (HAs) and (C,D) Humic substances (HS).
Figure 6: Principal component regression (PCR) of data from the 13C-CP/MAS-NMR and FTIR spectra and the root parameters of plant bioactivity. | Scientific Reports
