Table 2 Vegetation index (VIs) equations generated from high-throughput phenotyping and its respective reference

NDVI

\(\frac{Nir - Red}{{Nir + Red}}\)

[43]

SAVI

\(\left( {1 + 0.5} \right)\frac{nir - red}{{nir + red + 0.5}}\)

[44]

GNVDI

\(\frac{Nir - Green}{{Nir + Green}}\)

[45]

NDRE

\(\frac{nir - rededge}{{nir + rededge}}\)

[37]

SCCCI

\(\frac{NDRE}{{NDVI}}\)

[46]

EVI

\(\frac{nir - red}{{\left( {nir + 6red - 7.5green} \right) + 1}}\)

[47]

MSAVI

\(\frac{{2Nir + 1 - \sqrt {\left( {2Nir + 1} \right)^{2} } - \left( {8Nir - Red} \right)}}{2}\)

[48]