Table 7. The eigenvalues of the correlation matrix for four Growth Traits (GT) and 5 RGB-based growth index (RGB-VI) on 20 entries of kenaf.

Traits	Principle components
	GT+ RGB-VI		GT		RGB-VI
	First (84.29%)	Second (12.27%)	First (90.67%)	Second (5.90%)	First (97.21%)	Second (1.83%)
Sur a	0.327	0.127	0.486	0.733
Eph	0.291	0.444	0.511	-0.110
Sd	0.300	0.389	0.511	0.054
Nn	0.262	0.532	0.491	-0.669
EXG	0.322	-0.303			-0.409	-0.434
EXGR	0.327	-0.279			-0.413	-0.229
EXR	0.333	-0.194			-0.410	0.218
GLI	0.321	-0.314			-0.409	-0.470
NDI	0.343	-0.008			-0.401	0.635
VARI	0.328	-0.214			-0.407	0.296

^a Surface of individual plant = Sur, estimated plant height = Eph, stem diameter = Sd, and number of nodes = Nn.