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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
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