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Table 1 Spectral reflectance indices

From: Predicting grain yield using canopy hyperspectral reflectance in wheat breeding data

Index Name Physiological process Type Calculation
RNDVI Red normalized difference vegetation index Green area, photosynthetic capacity, N status VI [x(780) − x(670)]/[x(780) + x(670)]
GNDVI Green normalized difference vegetation index Green area, photosynthetic capacity, N status VI [x(780) − x(550)]/[x(780) + x(550)]/
SRa Simple ratio Green biomass VI [x(800)/]/[x(680)] and [x(900)]/[x(680)]
RARSa Ratio analysis of reflectance spectra chlorophyll a Chlorophyll a content PI [x(675)]/[x(700)]
RARSb Ratio analysis of reflectance spectra chlorophyll b Chlorophyll b content PI [x(675)]/[x(650) × x(700)]
RARSc Ratio analysis of reflectance spectra chlorophyll c Chlorophyll c content PI [x(760)]/[x(500)]
NPQI Normalized pheophytinization index Normal chlorophyll degradation; can be used to estimate phenology, pest and diseases PI [x(415) − x(435)]/[x(415) + x(435)]
PRI Photochemical reflectance index Dissipation of excess radiation PI [x(531) − x(570)]/[x(531) + x(570)]
  1. Index types: VI vegetation index, PI pigmented related index [19]