Table 2 Survival and height of Scots pine seedlings 1 year after planting. Different letters indicate significant differences in tree heights among the logging residue treatments (p < 0.05)
|  | Mean survival of seedlings ± SD [%] | Mean height ± SD [cm] |
|---|---|---|
Mechanical site preparation | ||
 Bedding and planting on ridges (SP-bed) | 89.1 ± 3.6 | 9.4 ± 2.9 |
 Plowing and planting in furrows (SP-furrow) | 86.1 ± 6.4 | 9.3 ± 3.3 |
 Disc trenching (SP-trench) | 88.2 ± 3.3 | 9.2 ± 3.0 |
Logging residue treatment | ||
 Complete removal (LR-1) | 89.1 ± 5.4 | 9.6 ± 3.4 b |
 Incineration (LR-2) | 86.4 ± 6.3 | 9.4 ± 3.0 ab |
 Leaving whole on surface (LR-3) | 85.9 ± 2.6 | 9.1 ± 3.1 a |
 Comminution and leaving on surface (LR-4) | 88.1 ± 5.4 | 9.2 ± 3.1 ab |
 Comminution and mixing with topsoil (LR-5) | 89.0 ± 4.3 | 9.3 ± 3.1 ab |