Fig. 5. Relationships between estimated and actually measured Chl content in maize leaves using chlorophyll Indices CI_{red edge} = (R_NIR/R_{red edge}) – 1 and CI_green = (R_NIR/R_green) – 1 where green band is between 540 and 560 nm and red edge band is between 705 and 725 nm (Gitelson et al., 2003a, 2005).