To evaluate northern latitude conifer cultural regimes, white spruce (Picea glauca [Moench] Voss) was: a) germinated under three germination and regimes (20/20°C under- and over-bench heating systems and 20/11°C under-bench heating system, all 12/12 h days/night) and then grown under a common cultural regime; or b) germinated ander a 20/20°C air temperature and fertilized with either a 20-8-20 grower formulation over the entire growing season, or a 20-20-20 Hi-Sol fertilizer until mid-July followed by a 10-52-17 finisher formulation. There were no significant differences in measured morphological characteristics or calculated seedling recovery between the heating systems at growing season end. Although the 20/20°C germination temperature nearly doubled germination heating costs over the split temperature 20/11°C treatment, seedling morphology and recovery were not improved. Under-bench heating costs in the full were 30% less than those for over-bench heating to the same temperature setpoints. Seedlings produced under the 20-8-20 fertilizer regime were significantly shorter, sturdier, and greater in root mass than seedlings produced under the 20-20-20 plus 10-52-27 treatment. As a result of these experiments, modified germination temperature and fertilizer regimes will be incorporated into nursery culture at Red Rock Research Station.
FRDA Research Report 064 (1794 KB)
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Updated July 24, 2015