Soil Type

Calibration

Validation

$R_c^2$

RMSEC

$R_v^2$

RMSEV

RPIQ

Clay

Calcareous

0.608

1.467

0.554

1.714

1.138

Neutral

0.547

2.612

0.501

2.801

0.603

Acidic

0.812

1.045

0.807

1.081

1.976

Sand

Calcareous

0.672

1.294

0.661

1.387

1.496

Neutral

0.583

2.418

0.591

2.405

1.018

Acidic

0.751

4.150

0.763

4.114

2.509