| Treatment | 2013 | 2014 | ||
| a | b | a | b | |
| Control | 0.109 | 342.4 | 0.089 | 234.8 |
| Ash-fertilization | 0.158 | 523.1 | 0.156 | 163.1 |
| Mounding | 0.165 | 415.5 | 0.120 | 218.0 |
| Mounding + levelling + ash | 0.229 | 173.6 | 0.215 | 165.1 |
| Mounding + ash | 0.216 | 218.9 | 0.173 | 172.5 |