The effect of fertilizer rate on growth of white pine in filtered (F) and non-filtered (NF) air.
| Parameter | Date | Air | Fertilizer | rate | ||
|---|---|---|---|---|---|---|
| 0 | 0.5X. | X | 2× | |||
| Candle length (cm) | 22 May ’86 | NF | 8.9b* | 12.4a | 15.0a | 13.1a |
| Trunk diameter (mm) | 22 May ’86 | NF | 10.2a | 11.0a | 11.2a | 10.8a |
| Candle length (cm) | 9 Sept ’86 | F | 10.1 | 14.5 | 14.6 | 12.4 |
| NF | 8.3 | 12.3 | 16.0 | 13.8 | ||
| Mean 9.2b | 13.3a | 15.3a | 13.1a | |||
| Trunk diameter (mm) | 9 Sept ’86 | F | 11.5 | 13.0 | 12.4 | 11.1 |
| NF | 11.7 | 13.2 | 12.6 | 11.3 | ||
| Mean 11.6b | 13.1a | 12.5ab | 11.3b | |||
| Needle length (mm) | 9 Sept ’86 | F | 6.3 | 7.9 | 8.5 | 8.3 |
| NF | 6.0 | 8.0 | 8.4 | 8.4 | ||
| Mean 6.1b | 8.0a | 8.4a | 8.3a | |||
| Height (cm) | 9 Sept ’86 | F | 30.2 | 30.3 | 30.3 | 29.2 |
| NF | 31.6 | 31.4 | 29.2 | 29.4 | ||
| Mean 30.9a | 30.9a | 29.7a | 29.3a | |||
| Cambial resistance | ||||||
| (Kohms) | 9 Sept ’86 | F | 22.5 | 15.5 | 16.1 | 13.7 |
| NF | 22.4 | 17.5 | 15.3 | 14.2 | ||
| Mean 22.4a | 16.6b | 15.7ba | 14.0c | |||
↵* Means followed by the same letter are not significantly different at P = 0.05 according to Duncan’s Multiple Range Test.