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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