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Table 2 Correlation matrix of measured soil attributes

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

  SOC N SOM pH EC P K Fe Sand Silt Clay
SOC 1 0.95 − 0.99 0.85 0.86 − 0.90 0.90 − 0.87 0.88 0.90 0.96
N 0.95 1 − 0.97 0.87 0.88 0.88 − 0.89 0.85 − 0.76 0.93 − 0.87
SOM − 0.99 − 0.97 1 − 0.86 0.89 − 0.87 − 0.67 0.89 − 0.65 0.94 0.96
pH 0.85 0.87 − 0.86 1 − 0.90 0.84 − 0.77 0.86 − 0.53 0.97 0.95
EC 0.86 0.88 0.89 − 0.90 1 0.87 0.45 0.94 − 0.76 − 0.76 0.81
P − 0.90 0.88 − 0.87 0.84 0.87 1 − 0.65 0.76 0.89 − 0.85 0.84
K 0.90 − 0.89 − 0.67 − 0.77 0.45 − 0.65 1 0.98 − 0.91 0.76 0.89
Fe − 0.87 0.85 0.89 0.86 0.94 0.76 0.98 1 0.92 0.78 − 0.67
Sand 0.88 − 0.76 − 0.65 − 0.53 − 0.76 0.89 − 0.91 0.92 1 − 0.98 − 0.56
Silt 0.90 0.93 0.94 0.97 − 0.76 − 0.85 0.76 0.78 − 0.98 1 0.99
Clay 0.96 − 0.87 0.96 0.95 0.81 0.84 0.89 − 0.67 − 0.56 0.99 1