Table 2.

List of phenotypic variables and equations used

Variables	Descriptions	Equations	Related to	References
NDVI	Normalized Difference Vegetation Index	(NIR−R)/(NIR+R)	Cover fraction, vegetation density	Rouse et al., 1973 Zarco-Tejada et al., 2005
VARI	Visible Atmospherical Resistant Index	(G–R)/(G+R)	Cover fraction, biomass production	Peng and Gitelson, 2011
SRPI	Simple Ratio Pigment Index	B/R	Nitrogen content, ratio carotenoid/chlorophyll total	Peñuelas et al., 1994, 1995 Lebourgeois et al., 2012
TsTa	Air-surface temperature difference	$\frac{(T_{\min }-T_a)-(T_s-T_a)}{(T_{\min }-T_a)-(T_{\max }-T_a)}$	Transpiration rate
WDI	Water Deficit Index		Evapotranspiration	Moran et al., 1994 Virlet et al., 2014
TCSA	Trunk Cross Sectional Area (mm2)	TC2/4π	Vigour, growth
NbFr	Fruit number per tree		Fruit biomass production
BmFr	Fruit biomass per tree (kg)		Fruit biomass production

NIR, near infrared; R, red; B, blue; G, green; T _max and T _min, maximum and minimum surface temperatures; T _s, surface temperature; T _a, air temperature; TC, trunk circumference, mm.