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Table 1 Statistical summary of the SPA analyzed using conventional laboratory methods

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

Soil attributes Min Max Mean Std. deviation
SOC (g kg−1) 0.12 0.16 0.13 0.72
N (mg kg−1) 212.23 250.88 226.66 14.98
SOM (g kg−1) 9.12 134.87 50.46 39.09
pH values 7.14 8.42 7.95 0.35
EC (d Sm−1) 0.25 0.46 0.36 0.07
P (mg kg−1) 21.27 81.29 37.41 15.26
K (mg kg−1) 773.12 3308.94 1937.06 800.12
Fe (mg kg−1) 0.926 2.994 1.85 0.89
Sand (g kg−1) 89 765 360 230.37
Silt (g kg−1) 97 876 388.06 236.11
Clay (g kg−1) 109 398 193 77.63