This study was carried out by the Forestry Research Institute. 5 Turkish main tree species, Oak (Quercus), pine (Pinus sylvestris), beech (Fagus orientalis) and Fir (Abies bornmülleriana) wooden poles and fence posts, were treated with Tanalith-U and creosote applying pressure process. Tanalith-U was applied by full-cell process and creosote was applied by empty cell process. Treated and untreated wooden poles and fence post were installed in Bolu and Ankara plot areas. The study was started in 1958 and finished in 1976. At the beginning of the study, experiment period was 30 years but droped down to 18 years. In this research, durability of the treated and untreated wooden poles and fence posts were compared.

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