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Greenhouse germination trials of pelletized western redcedar and red alder seedsAuthor(s): Nabil Khadduri
Source: In: Riley, L.E.; Dumroese, R.K.; Landis, T.D. National Proceedings: Forest and Conservation Nursery Associations - 2006. Proceedings RMRS-P-50. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 15-19
Publication Series: Proceedings (P)
Station: Rocky Mountain Research Station
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DescriptionPelletized western redcedar (Thuja plicata Donn ex D. Don) and red alder (Alnus rubra Bong.) seeds exhibited lower total germination and delayed germination speed (G50 or days to 50% germination) when compared to non-pelletized “raw” seeds in greenhouse trials. Averaged across two lots of western redcedar, pelletizing decreased total germination from 81% to 76% and delayed germination by 2 days. Averaged across four lots of red alder, pelletizing decreased germination from 78% to 68% and delayed germination by 7 days. It is logistically difficult to both stratify and pelletize seeds. Western redcedar often receives a stratification treatment in practice, even though none is recommended in standard protocols. Lab tests conducted on four lots of 21-day stratified versus non-stratified seeds showed no change in total germination and only a 2.5-day delay in germination speed, suggesting a lack of dormancy in western redcedar. Given the efficiencies gained in mechanical sowing and subsequent thinning operations, pelletizing is a cost effective decision for the light, irregular-shaped seeds of these species.
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CitationKhadduri, Nabil. 2007. Greenhouse germination trials of pelletized western redcedar and red alder seeds. In: Riley, L.E.; Dumroese, R.K.; Landis, T.D. National Proceedings: Forest and Conservation Nursery Associations - 2006. Proceedings RMRS-P-50. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 15-19
Keywordspelletized seeds, Thuja plicata, Alnus rubra
- Red alder stand development and dynamics.
- Germination of red alder seed.
- Relations between red alder composition and understory vegetation in young mixed forests of southeast Alaska.
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