Effects of paclobutrazol on, and F and P values from ANOVA for nitrogen and secondary metabolites of paper birch (Betula pendula) and Austrian pine (Pinus nigra) in response to paclobutrazol and fertilization applied alone or in combination.
| Source of variation | ||||||||
|---|---|---|---|---|---|---|---|---|
| Treatment means | Paclobutrazol (P) | Fertilization (F) | Interaction P × F | |||||
| Paclobutrazol | No paclobutrazol | F-value | P-value | F-value | P-value | F-value | P-value | |
| Paper birch | ||||||||
| Nitrogen (% dry weight) | ||||||||
| 2003 (June 24) | 3.0±0.1 | 3.0±0.1 | 0.04 | 0.848 | 3.94 | 0.054 | 0.16 | 0.688 |
| 2004 (June 14) | 2.0±0.1 | 2.1±0.1 | 1.07 | 0.309 | 3.79 | 0.061 | 0.30 | 0.586 |
| 2004 (August 24) | 2.1±0.1 | 1.9±0.1 | 5.14 | 0.032 | 12.31 | 0.002 | 0.47 | 0.501 |
| Tannins (% dry weight) | ||||||||
| 2003 (June 24) | 21.5±1.5 | 15.9±1.5 | 6.86 | 0.012 | 0.13 | 0.716 | 0.19 | 0.661 |
| 2004 (June 14) | 8.6±0.7 | 7.4±0.6 | 1.92 | 0.176 | 0.02 | 0.903 | 3.90 | 0.057 |
| 2004 (August 24) | 10.1±1.0 | 8.4±0.8 | 1.97 | 0.173 | 1.17 | 0.290 | 0.25 | 0.618 |
| Phenolics (% dry weight) | ||||||||
| 2003 (June 24) | 14.0±0.9 | 12.8±0.9 | 0.86 | 0.360 | 0.01 | 0.938 | 0.53 | 0.469 |
| 2004 (June 14) | 21.8±1.0 | 21.2±0.8 | 0.17 | 0.679 | 0.04 | 0.835 | 0.00 | 0.969 |
| 2004 (August 24) | 21.7±1.3 | 21.4±1.2 | 0.03 | 0.855 | 3.76 | 0.063 | 0.08 | 0.784 |
| Austrian pine | ||||||||
| Nitrogen (% dry weight) | ||||||||
| 2004 (May 6)z | 1.4±0.1 | 1.5±0.1 | 1.23 | 0.274 | 3.10 | 0.086 | 0.15 | 0.701 |
| 2005 (May 10)z | 1.3±0.1 | 1.2±0.1 | 1.46 | 0.234 | 0.02 | 0.089 | 1.22 | 0.276 |
| Tannins (% dry weight) | ||||||||
| 2003 (May 9)z | 9.2±0.5 | 8.8±0.5 | 0.33 | 0.570 | 0.00 | 0.960 | 0.16 | 0.691 |
| 2004 (May 6)z | 18.0±0.5 | 17.1±0.5 | 1.59 | 0.215 | 0.31 | 0.584 | 0.85 | 0.362 |
| 2004 (August 24)y | 9.0±0.5 | 8.3±0.5 | 0.68 | 0.413 | 0.05 | 0.822 | 0.44 | 0.510 |
| Phenolics (% dry weight) | ||||||||
| 2003 (May 9)z | 8.6±0.3 | 8.1±0.3 | 1.24 | 0.277 | 1.88 | 0.184 | 0.29 | 0.595 |
| 2004 (May 6)z | 10.0±0.3 | 9.3±0.3 | 2.87 | 0.098 | 1.37 | 0.248 | 0.05 | 0.832 |
| 2004 (August 24)y | 4.4±0.3 | 4.2±0.3 | 0.21 | 0.646 | 0.12 | 0.730 | 0.02 | 0.895 |
| Terpenes (mg/g fresh weight) | ||||||||
| 2003 (May 9)z | 2.3±0.1 | 2.3±0.1 | 0.08 | 0.782 | 0.11 | 0.743 | 0.52 | 0.474 |
| 2004 (May 6)z | 2.6±0.2 | 3.1±0.2 | 3.76 | 0.060 | 3.40 | 0.072 | 0.00 | 0.986 |
| 2005 (May 10)z | 4.2±0.4 | 5.3±0.4 | 3.70 | 0.061 | 1.19 | 0.282 | 1.20 | 0.279 |