Fig. 8.

Effects caused by the plastic cover on wet material. a The digital image (left) and predicted mosaics of the same material under the wet (middle) and the wet and plastic covering (right) conditions by the partial least squares discriminant analysis model based on setup II. Most of the spent mushroom substrate (SMS) and mycelia (Myc) were predicted correctly. b The second derivative of the mean spectra of SMS under different conditions. Even though four unexpected peaks were created by the plastic chemical contamination, the important peaks for water, carbohydrates, protein, and lignin can still be identified for the plastic cover SMS