Ecological Processes

Table 4 Statistics summary of the spectral models for the soil attributes using PLSR on FDT with the SG smoothing datasets (after 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)	0.90	3.28	0.89	3.51	7.72	2.19
N (mg kg⁻¹)	0.72	3.95	0.68	4.34	9.25	2.13
SOM(g kg⁻¹)	0.94	2.47	0.93	2.66	6.15	2.31
pH values	0.86	1.90	0.82	2.12	4.31	2.03
EC (d Sm⁻¹)	0.90	3.65	0.89	4.11	5.47	1.33
P (mg kg⁻¹)	0.98	1.39	0.98	1.41	2.56	1.81
K (mg kg⁻¹)	0.84	4.05	0.82	4.22	6.25	1.48
Fe (mg kg⁻¹)	0.95	1.48	0.94	1.56	3.34	2.14
Sand (g kg⁻¹)	0.98	1.79	0.98	1.89	3.37	1.78
Silt (g kg⁻¹)	0.93	1.62	0.90	1.97	3.43	1.74
Clay (g kg⁻¹)	0.70	9.48	0.69	9.91	13.18	1.32

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