| Summary: | This thesis contains information from the study of Norway spruce clones, which possess certain inheritable traits (1) of value for timber used in building constructions (i.e. higher wood basic density, elasticity, and resistance to crashing) and (2) greater wood yield. The following growth and quality traits of 90 clones in Baisogala seed orchard of Radviliškio forest enterprise were assessed: stem height and diameter, crown diameter, branching type and class of budburst. Significance of differences among the clones was estimated for all the these traits. Correlation coefficients among qualitative and quantitative traits were calculated. Owing to relatively lower radial increment and thicker annual ring, clones of brushy and flat branching types produced wood of a higher basic density and, thus, of a greater quality. A more slowly growth of clones with the above mentioned branching types was observed on their progeny as well. Therefore, if there is no need for stems of a relatively larger diameter, it would be more rational to produce Norway spruce stands of flat and brushy branching types.
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