| The Parameters of the Quadratic Equation | Developed PTFs by Nonlinear Regression |
|---|---|
| PTFs developed using soil texture | |
| b1 | 4.96×10-8.exp (8.67×10-3.sand -1.4×10-2.silt +1.03×10-2.clay) |
| b2 | 1.551× 10-6 .exp (5.33×10-3.sand+2.33×10-3.silt-2.67×10-3.clay) |
| b3 | 3.5 ×10-6 .exp (1.83×10-2.sand+1×10-3.silt-3.3×10-3.clay) |
| PTFs developed using soil texture and soil bulk density | |
| b1 | 3.72×10-8.exp (0.0062.sand -0.01.silt +0.0078.clay+0.43.B.D) |
| b2 | 1.86 × 10-6 .exp (0.004.sand+0.0017.silt-0.002.clay-0.11.B.D) |
| b3 | 4.95 ×10-6 .exp (0.014.sand+0.00075.silt-0.0025.clay-0.24.B.D) |
| PTFs developed using soil texture, soil bulk density, and organic matter | |
| b1 | 3.65×10-8.exp (0.0052.sand -0.0084.silt +0.0062.clay+0.35.B.D-0.034.O.M) |
| b2 | 1.81 × 10-6 .exp (0.0032.sand+0.0014.silt-0.0016.clay-0.09.B.D+0.01.O.M |
| b3 | 4.54 ×10-6 .exp (0.011.sand+0.0006.silt-0.002.clay-0.19.B.D+0.024.O.M) |