Fedorkov, A. 2017. Stem Growth and Quality of Six Provenances of Larix sukaczewii Dyl. and Larix sibirica Ledeb. in a Field Trial Located in North-west Russia. Baltic Forestry 23(3): 603-607.

   Stem growth and quality of four provenances of Larix sukaczewii and two provenances of Larix sibirica originating from Russia were estimated in a 9-yr field trial performed in the Komi Republic (north-west Russia) using a fully randomized single-tree plot design with 7 blocks. Overall survival was 78% reflecting the harsh environmental conditions in the region. ANOVA has shown that tree provenance had highly significant (P<0.05) effect on height, diameter and volume. There was significant (P<0.05) Pearson correlation between tree height at age 5 years and 9 years, indicating age-age correlation at the provenance level. There were strong and significant (P<0.05) negative relationships between DBH and stem volume and continentality index of the provenances. The proportion of free-defects stems varied from 46.7 to 65.5% and most common defects were weak crookedness. Better stem growth and quality was observed for northern provenances of L. sukaczewii.

   Keywords: Larix sibirica, Larix sukaczewii, provenance trial, stem defects, stem growth, survival.