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The influence of oscillating climate conditions during the conventional drying of beech timber on drying time and drying quality has been analyzed. Three conventional drying cycles were carried out as well as nine cycles, in which the oscillations of equilibrium moisture content (EMC), temperature, and their combination were applied. The combinations of two amplitudes (10% or 20%) and two frequencies (3 or 6 h) were used in different test runs. Higher drying quality regarding casehardening was achieved both in runs with oscillations of EMC (gap values 2.2-2.4 mm) and in runs with temperature oscillations (gap values 2.3-2.4 mm) compared with conventional runs (gap values 2.5-2.9 mm). The oscillations of both temperature and EMC did not improve any of the observed parameters.

AbSTRAcT• The paper presents the research of differences in quantitative and value yields, and structure of sawn timber and residues, whose appearance is caused by different methods of sawing beech logs with red heartwood. In order to achieve the goal, 45 logs were divided into three even groups and sawn into commercial timber using three methods: round, cant and live sawing. Similar quantitative yields were found for round sawing and cant sawing (60.63 % and 60.52 %, respectively)

• The infl uence of applying the oscillations of air parameters during conventional drying of beech timber on energy consumption is discussed in the paper

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