Linear regression model | R2 | RMSE | F | Sig. |
Soil CEC = − 0.060pH + 0.093OM + 0.183Fe2O3 + 0.217Silt + 0.289Clay − 3.187 × 10−16 | 0.198 | 0.92 | 3.90 | 0.003 |
Clay CECm = − 0.063pH + 0.020OM − 0.220Fe2O3 + 0.429Silt + 0.103Clay − 6.634 × 10−16 | 0.201 | 0.92 | 3.96 | 0.003 |
Clay CECc = − 0.008pH + 0.221OM + 0.198Fe2O3 + 0.205Silt − 0.559Clay − 7.710 × 10−16 | 0.467 | 0.75 | 13.86 | 0.000 |
Δ clay CEC = 0.054pH + 0.154OM + 0.368Fe2O3 − 0.114Silt − 0.763Clay − 5.316 × 10−16 | 0.552 | 0.69 | 19.48 | 0.000 |
Silt CEC = −0.211pH − 0.060OM + 0.485Fe2O3 + 0.033Silt − 0.428Clay − 3.603 × 10−16 | 0.246 | 0.90 | 5.15 | 0.000 |