Table 3.

PLS calibration models results for the different soils parameters using the entire NIR spectra pre-processed with Savitzky-Golay (using 15 points filter width, second polynomial order and first derivative) followed by SNV and then mean centered.

Parameters	LV	RMSEC	RMSECV	RMSEP	R2C	R2P	RER
pH -H2O	8	0.19	0.44	0.27	0.94	0.85	11
pH - KCl	6	0.30	0.50	0.25	0.73	0.78	7
Corg	6	1.50	2.20	1.70	0.86	0.84	9
CnH	6	0.79	1.30	1.50	0.85	0.27	4
N	6	0.09	0.14	0.10	0.91	0.90	13
C/N	3	3.70	4.50	2.80	0.42	0.55	6
Ca2+	8	1.40	3.50	1.70	0.98	0.98	17
Mg2+	5	0.42	0.64	0.52	0.97	0.97	19
Na+	2	0.12	0.13	0.09	0.37	0.46	5
K+	6	0.06	0.09	0.08	0.75	0.56	5
SB	5	2.20	4.40	3.00	0.97	0.95	16
Al3+	6	0.20	0.34	0.21	0.55	0.69	7
CEC	5	0.65	1.00	0.77	0.94	0.89	11
ECEC	7	1.80	4.50	2.40	0.98	0.97	19
GSB	7	19.00	52.00	27.00	0.97	0.93	13
GSA	6	8.70	13.00	11.00	0.68	0.49	5
P	4	13.00	18.00	14.00	0.19	0.07	4
K	5	27.00	38.00	31.00	0.61	0.36	5