Figure 1.Relationship between photosynthetic photon flux density (PPFD) and maize leaf chlorophyll a fluorescence (CLFa) parameters. Panels A, B, C sourced from Rahinzadeh-Bajgiran et al. 2017 depicting the Frauhofer Line Depth-Laser Induced Saturation Pulse (FLD-LISP) method. Panels C,D,E are corresponding CLFa estimates from the MultispeQ PAM fluorometer collected by Walters and Shabir 2018.