Nondestructive estimation of potato yield using relative variables derived from multi-period LAI and hyperspectral data based on weighted growth stage

Table 1 Vegetation indices used in this study

Vegetation indices	Formula	References
Normalized Difference Vegetation Index (NDVI)	(R₈₀₀ − R₆₇₀)/(R₈₀₀ + R₆₇₀)	Rouse et al. [45]
Red edge Chlorophyll Index (CI_{red edge})	R₈₀₀/R₇₂₀ − 1	Gitelson et al. [46]
Green edge Chlorophyll Index (CI_green)	R₈₀₀/R₅₅₀ − 1	Gitelson et al. [46]
Two-band Enhanced Vegetation Index (EVI2)	2.5(R₈₀₀ − R₆₇₀)/(1 + R₈₀₀ + 2.4R₆₇₀)	Jiang et al. [47]
Normalized Difference Red edge (NDRE)	(R₈₀₀ − R₇₂₀)/(R₈₀₀ + R₇₂₀)	Gitelson et al. [48]
MERIS Terrestrial Chlorophyll Index (MTCI)	(R₈₀₀ − R₇₂₀)/(R₇₂₀ − R₆₇₀)	Dash et al. [49]

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