Preservative loss from stakes treated with ammoniacal copper borate

Southern pine stakes were pressure treated with ammoniacal copper borate and buried vertically to one half their length for 11 years at the Harrison Experimental Forest in Saucier, Miss. Chemical analyses showed much higher losses of boron compared to copper from both the groundline and aboveground portions of stakes. Residual boron in the stakes was 1.2 percent at the groundline and 12 percent aboveground. Residual copper was 79 percent at the groundline and 87 percent aboveground. Degradation of stakes by decay fungi and termites was light to moderate. Protection was attributed to the residual copper.

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