Abstract
Abstract Sorting seed by size has been reported as a potential method to improve seedling uniformity and increase crop yields. Seeds of rust-resistant western white pine (Pinus monticola Dougl. ex D. Don), harvested in 1983 at the Moscow, Idaho, White Pine Breeding Arboretum, were separated by screens into diameter classes. Seedlings from each size class were grown in containers in greenhouses. Differences in seed diameter were associated with differences in germination capacity and germination energy (P < 0. 01). Seed diameter was unrelated to final height and stem diameter of seedlings (p < 0.05). Separate sowing of sized seed could not be justified for production containerized nurseries as similar numbers of quality seedlings were produced by sowing bulk seed. West. J. Appl. For. 2(4):128-130, October 1987.
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