Non-destructive parameters could be used to predict the maturity
indices of red flesh dragon fruit such as DAFS, TSS, TA, TSS/TA
and WR with relatively high levels of accuracy based on PLSR.
However with MMI (a multivariate maturity index) created from
the original destructive parameters and DAFS by PCA, the prediction
performance was improved. A simplified PLSR model was created
with the application of log (R680/R550) in place of the whole
spectrum of light reflectance) and non-destructive parameters
which resulted in a comparably accurate prediction of MMI.