Robustness of Tomato Quality Evaluation Using a Portable Vis-SWNIRS for Dry Matter and Colour

Table 1

Population and calibration model statistics of hydroponic tomato fruit DM (729–975 nm) and colour (CIE ) (500–720 nm), based on the interactance spectra (# refers to the number of PLS factors).

Population	DM population statistics			DM PLSR model statistics				CIE population statistics		CIE PLSR model statistics
	Sample #	Mean	SD	#		RMSECV	SDR	Mean	SD	#f		RMSECV	SDR
Pop 1	360	7.67	1.52	9	0.91	0.43	3.55	−9.92	1.12	2	0.69	0.6	1.86
Pop 2	420	7.93	1.99	9	0.94	0.49	4.04	−4.54	12.65	7	0.98	1.62	7.83
Pop 3	430	7.7	1.67	8	0.91	0.47	3.54	6.59	16.18	2	0.88	5.64	2.87
Pop 4	396	7.65	1.48	9	0.91	0.45	3.37	17.99	12.64	1	0.96	3.46	3.65
Pop 5	100	8.26	1.87	8	0.91	0.54	3.47	16.17	15.67	2	0.95	3.55	4.42
Pop 1-2	780	7.81	1.79	10	0.92	0.48	3.72	−7.02	9.69	2	0.96	1.79	5.41
Pop 1–3	1210	7.77	1.75	10	0.9	0.52	3.37	−2.18	13.99	2	0.93	3.54	3.95
Pop 1–4	1606	7.74	1.68	10	0.9	0.51	3.28	2.79	16.2	2	0.95	3.65	4.44
Pop 1–5	1706	7.77	1.7	10	0.93	0.52	3.28	3.59	16.48	2	0.95	3.49	4.72
N added	484	7.13	1	11	0.84	0.38	2.6	2.82	15.56	2	0.93	4.08	3.82
Salt added	280	10.53	1.68	10	0.91	0.49	3.43	7.29	18.37	2	0.96	3.62	5.07
Fruit removed	300	7.59	0.95	11	0.84	0.36	2.67	2.08	15.63	2	0.97	2.49	6.26
Leaf removed	748	7.29	1.48	9	0.88	0.51	2.88	9.94	16.33	2	0.93	4.21	3.88
Control	362	7.5	1.13	11	0.87	0.38	2.95	2.36	16.13	2	0.94	3.85	4.19