Liner regression model | R2 | RMSE | F | Sig. |
CEC1 = 0.180pH + 0.009SOM + 0.256Fe2O3 + 0.173Silt − 0.016Clay + 1.672 × 10−5 | 0.145 | 0.95 | 3.67 | 0.004 |
CEC2 = 0.360pH + 0.023SOM − 0.136Fe2O3 + 0.165Silt − 0.100Clay + 1.581 × 10−5 | 0.220 | 0.90 | 6.11 | 0.000 |
ΔCEC = 0.131pH + 0.005SOM + 0.306Fe2O3 + 0.159Silt + 1.536 × 10−5 | 0.149 | 0.94 | 3.79 | 0.003 |