Skip to Main Content
What's in your Douglas-fir bark?Author(s): M. Gabriela Buamscha; James E. Altland
Source: In: Dumroese, R. K.; Riley, L. E., tech. coords. National Proceedings: Forest and Conservation Nursery Associations-2007. Proc. RMRS-P-57. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 89-103
Publication Series: Proceedings (P)
Station: Rocky Mountain Research Station
PDF: Download Publication (185 B)
DescriptionDouglas-fir bark is a common waste product of forest industry, and has potential use as a substrate in container nurseries. Douglas-fir bark (DFB) is strongly acidic and contains amounts of phosphorus, potassium, iron, copper and manganese within or above the levels recommended for growing container crops. As the pH of DFB decreases, electrical conductivity and amounts of extractable phosphorus, calcium, magnesium, boron, and iron increase. Although liming unfertilized DFB with calcium carbonate up to 3 kg/m3 (5 lb/yd3) is effective at raising pH, the resulting pH is higher than desired for container plants after 6 incubation weeks. Native phosphorus in aged DFB leaches quickly under typical nursery conditions, but it may still be a reliable phosphorus source for plant growth for at least a month, providing pH is kept low.
Bark screen size seems to have a stronger effect on the uniformity of DFB chemical properties throughout the year than does bark age. Non-amended fresh and aged DFB provided sufficient micronutrients for the growth of annual vinca for up to 2 months when pH was kept low (< 5.7).
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
CitationBuamscha, M. Gabriela; Altland, James E. 2008. What''s in your Douglas-fir bark?. In: Dumroese, R. K.; Riley, L. E., tech. coords. National Proceedings: Forest and Conservation Nursery Associations-2007. Proc. RMRS-P-57. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 89-103
KeywordsPseudotsuga menziesii, fresh bark, aged bark, container growing media, macronutrients, micronutrients, phosphorus
- Effects of nitrogen and phosphorus fertilizers on deer browsing and growth of young Douglas-fir.
- Tree microhabitat structures as indicators of biodiversity in Douglas-fir forests of different stand ages and management histories in the Pacific Northwest, U.S.A.
- Probability of infestation and extent of mortality associated with the Douglas-fir beetle in the Colorado Front Range
XML: View XML