| Source of variation | WSA |
| TWSA | ||
| In - Out | In |
| In - Out | In | |
|
| P | ||||
| Fertilizer | 0.47 | <0.01 |
| 0.47 | 0.18 |
| Depth | 0.15 | <0.01 |
| 0.22 | 0.16 |
| Fertilizer × depth | 0.32 | 0.02 |
| 0.50 | 0.77 |
| Size class | 0.08 | <0.01 |
| - | - |
| Fertilizer × size class | 0.73 | 0.41 |
| - | - |
| Depth × size class | 0.31 | <0.01 |
| - | - |
| Fertilizer × depth × size class | 0.33 | 0.07 |
| - | - |