Ecological Processes

Table 3 The statistical summary of the spectral models for the soil attributes using PLSR on raw datasets (before pre-treatment)

From: Determination of soil physicochemical attributes in farming sites through visible, near-infrared diffuse reflectance spectroscopy and PLSR modeling

Soil attributes	Calibration set		Validation set
Soil attributes	R ²	RMSE	R ²	RMSEP	SD	RPD
SOC (g Kg⁻¹)	0.72	5.55	0.72	5.64	22.53	3.99
N (mg Kg ⁻¹)	0.54	3.75	0.48	4.03	10.36	2.57
SOM(g Kg⁻¹)	0.71	5.69	0.68	5.89	14.76	2.50
pH Values	0.68	2.87	0.67	2.96	11.02	3.72
EC (d Sm⁻¹)	0.80	2.07	0.77	2.27	7.95	3.50
P (mg Kg ⁻¹)	0.92	3.07	0.90	3.38	5.37	1.58
K (mg Kg ⁻¹)	0.69	5.35	0.65	5.62	8.77	1.56
Fe (mg Kg ⁻¹)	0.59	4.38	0.58	4.49	5.24	1.16
Sand (g Kg⁻¹)	0.80	8.95	0.80	9.31	8.39	0.90
Silt (g Kg⁻¹)	0.87	2.20	0.85	2.42	3.08	1.27
Clay (g Kg-1)	0.51	9.28	0.49	9.58	10.69	1.11

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