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Hybrid poplar (Populus trichocarpa Torr. and Gray × Populus deltoides Marsh.) plantations, at two locations in southern British Columbia, were examined 9 years after planting, to determine the effects of plantation spacing on individual-tree and per-hectare growth and development. At both locations, spacing had a direct, significant effect on virtually all of the individual-tree characteristics examined. For a given amount of growing space per tree, rectangularity (within-row/between-row spacing ratios) had no significant effect on individual-tree diameter, height, or total bole volume. Virtually all of the per-hectare characteristics examined were not significantly affected by spacing at either location.

The Effects of Initial Spacing and Rectangularity on the Early Growth of Hybrid Poplar