Controlling the height of spruce seedlots (Picea spp.) to desired standards is a recognized problem at high latitude nurseries in British Columbia. Nutrient- and, more commonly, drought-stressed techniques are often used to control seedling height. Drought stressing, however, can be biologically hard on seedlings, resulting in poorer quality and slower bud formation and in reduced root mass. Height control through nutrient stressing is not well understood in conifers, nor are the biological assets and liabilities of the process. For these reasons, other means of height control should be considered, especially for northern nurseries where achieving target root mass is a perennial problem. The experimental series described in this report includes a number of spruce seedlots and photoperiod duration combinations, because blackout affects seedlots differently as a result of genotype x environment interactions and seedling response to photoperiod, light, and temperature varies at different stages of growth.
FRDA Research Report 170 (3107 KB)
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Updated July 24, 2015