“…For each of three wood species (redoak, hickory, and yellow poplar) and three others (switch grass, corn stover, and bagasse) three different samples were collected. NIR data for these biomass species were obtained with an advanced spectral devices (ASD) field spectrometer (wavelength range from 1,000 nm to 2,500 nm, Boulder, USA) [10]. The NIR data was reduced by averaging the 1 nm interval spectra to one with 4 nm intervals.…”