Table 2.
Classification of F1 hybrids from all hybridizations into three vigor classes depending on the trunk cross-sectional area—TCSA (cm2) and tree height (m).
| Vigor of Parents | Total F1 | Number of Hybrids and Their Percentage with Vigor Tree | ||||||
|---|---|---|---|---|---|---|---|---|
| Trunk Cross-Sectional Area (cm2) | Height of the Tree (m) | |||||||
| Mother ♀ | Father ♂ | Weak | Medium | Strong | Weak | Medium | Strong | |
| (<38.5) | (38.5–78.5) | (>78.5) | (<3.5) | (3.5–4.5) | (>4.5) | |||
| Strong | Strong | 312 | 27 | 183 | 102 | 18 | 135 | 159 |
| Medium | 318 | 39 | 213 | 66 | 39 | 162 | 117 | |
| Weak | 747 | 108 | 405 | 234 | 90 | 423 | 234 | |
| Total group (♀ strong) | 1377 | 174 | 801 | 402 | 147 | 720 | 510 | |
| (100%) | (12.6%) | (58.2%) | (29.2%) | (10.7%) | (52.3%) | (37.0%) | ||
| Medium | Strong | 783 | 118 | 549 | 116 | 93 | 357 | 333 |
| Medium | 1503 | 228 | 1077 | 198 | 249 | 810 | 444 | |
| Weak | 678 | 126 | 492 | 60 | 132 | 357 | 189 | |
| Total group (♀ medium) | 2964 | 472 | 2118 | 374 | 474 | 1524 | 966 | |
| (100%) | (15.9%) | (71.5%) | (12.6%) | (16.0%) | (51.4%) | (32.6%) | ||
| Weak | Strong | 576 | 123 | 300 | 153 | 105 | 309 | 162 |
| Medium | 534 | 135 | 315 | 84 | 120 | 330 | 84 | |
| Weak | 105 | 27 | 60 | 18 | 30 | 69 | 6 | |
| Total group (♀ weak) | 1215 | 285 | 675 | 255 | 255 | 708 | 252 | |
| (100%) | (23.5%) | (55.6%) | (21.0%) | (21.0%) | (58.3%) | (20.7%) | ||
| Total general | 5556 | 931 | 3594 | 1031 | 876 | 2952 | 1728 | |
| (100%) | (16.8%) | (64.7%) | (18.6%) | (15.8%) | (53.1%) | (31.1%) | ||
For each group of parents, the calculated percentage is shown in parentheses. The classification of hybrids into a particular vigor category based on TCSA or tree height (weak, medium, or strong) was done arbitrarily.