Five-year field trials using preservative-treated, second-growth Douglas-fir exposed in ground contact in Australia

The durability of preservative-treated stakes of second-growth Coastal Douglas-fir was evaluated in a field plot in northern Queensland, Australia. Results from this field trial indicate that second-growth Douglas-fir can be treated with preservatives to meet Australian standards and will provide long-term durability in adverse environments. Data presented indicate that within a 5-year time frame, the importance of minimum penetration parameters decreases as retention increases.

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