Buamsch, MG et al. 2007. Chemical and physical properties of Douglas Fir Bark relevant to production of container plants
Tested various properties of Douglas fir bark and found that properties differ less to age than to bark source. M. Gabriela Buamscha, JE Altland, DM Sullivan, DA Horneck, J Cassidy. HORTSCIENCE 42(5):1281–1286. 2007.
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