Soil depth (cm) | Horizontal distance (cm) | Vertical distance (cm) | |||
0 | 30 | 60 | 30 | 60 | |
0 - 20 | 14 | 18 | 14 | 18 | 21 |
20 - 40 | 21 | 21 | 18 | 18 | 18 |
40 - 60 | 14 | 28 | 14 | 14 | 25 |
60 - 80 | 14 | 14 | 25 | 35 | 28 |