| Land characteristic | Characteristic boundary | Function | |||
| a | b | c | d | ||
| Base saturation | 0 | 20 | 50 | / | Sigmoid |
| OC | 0 | 1.2 | 2.5 | / | Sigmoid |
| CEC | 0 | 16 | 26 | / | Sigmoid |
| Coarse fragment | 55 | 35 | 0 | / | Sigmoid |
| Depth | 0 | 40 | 76 | / | Sigmoid |
| EC | 4.2 | 3 | 0 | / | Sigmoid |
| ESP | 21 | 10 | 0 | / | Sigmoid |
| pH | 3 | 5.5 | 6 | 7.9 | Trapezoidal |
| Precipitation | 600 | 1200 | 1400 | 2000 | Trapezoidal |
| RH% | 30 | 60 | 80 | 100 | Sigmoid |
| Texture | 80 | 50 | 14 | / | Sigmoid |
| Slope % | 100 | 7.5 | 0 | / | Sigmoid |
| Temperature | 16 | 20 | 26 | 35 | Trapezoidal |