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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
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