Utjecaj propisanog načina premjera na greške obračunate zapremine oblog drveta smrče (Picea abies (L.) Karsten) i jele (Abies alba Mill.)
The study examined the sources of volume loss in spruce and fir roundwood resulting from the prescribed Huber’s formula, the prescribed method of diameter measurement, the prescribed method of length measurement, and the deduction of double bark thickness. The Riecke’s formula was assumed to provide the most accurate determination of log volume and was therefore used to calculate the gross volume of roundwood, serving as the reference value for quantifying the observed losses. For all analyzed sources of volume loss except when applying Huber’s formula, a dependence on diameter class was observed, with losses decreasing as diameter increased. The highest percentage of volume loss for both spruce and fir logs was found when deducting double bark thickness (ranging from 9.1% to 6.4% for spruce and from 10.7% to 7.7% for fir), followed by the prescribed method of diameter measurement (from 7.3% to 1.7%). Additional losses were associated with the prescribed volume calculation formula (from 5.3% to 1.5% for spruce and from 3.7% to 1.1% for fir) and the prescribed method of length measurement (from 3.1% to 2.1%).