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Original scientific paper

Costs and efficiency of timber harvesting by NIAB 5–15 processor mounted on a farm tractor

Janusz Sowa
Dariusz Kulak
Grzegorz Szewczyk

Fulltext: english, pdf (213 KB) pages 177-184 downloads: 1.938* cite
APA 6th Edition
Sowa, J., Kulak, D. & Szewczyk, G. (2007). Costs and efficiency of timber harvesting by NIAB 5–15 processor mounted on a farm tractor. Croatian Journal of Forest Engineering, 28 (2), 177-184. Retrieved from https://hrcak.srce.hr/18252
MLA 8th Edition
Sowa, Janusz, et al. "Costs and efficiency of timber harvesting by NIAB 5–15 processor mounted on a farm tractor." Croatian Journal of Forest Engineering, vol. 28, no. 2, 2007, pp. 177-184. https://hrcak.srce.hr/18252. Accessed 25 Oct. 2021.
Chicago 17th Edition
Sowa, Janusz, Dariusz Kulak and Grzegorz Szewczyk. "Costs and efficiency of timber harvesting by NIAB 5–15 processor mounted on a farm tractor." Croatian Journal of Forest Engineering 28, no. 2 (2007): 177-184. https://hrcak.srce.hr/18252
Harvard
Sowa, J., Kulak, D., and Szewczyk, G. (2007). 'Costs and efficiency of timber harvesting by NIAB 5–15 processor mounted on a farm tractor', Croatian Journal of Forest Engineering, 28(2), pp. 177-184. Available at: https://hrcak.srce.hr/18252 (Accessed 25 October 2021)
Vancouver
Sowa J, Kulak D, Szewczyk G. Costs and efficiency of timber harvesting by NIAB 5–15 processor mounted on a farm tractor. Croatian Journal of Forest Engineering [Internet]. 2007 [cited 2021 October 25];28(2):177-184. Available from: https://hrcak.srce.hr/18252
IEEE
J. Sowa, D. Kulak and G. Szewczyk, "Costs and efficiency of timber harvesting by NIAB 5–15 processor mounted on a farm tractor", Croatian Journal of Forest Engineering, vol.28, no. 2, pp. 177-184, 2007. [Online]. Available: https://hrcak.srce.hr/18252. [Accessed: 25 October 2021]

Abstracts
The present research deals with costs and economic effectiveness of timber harvesting technology with the use of the NIAB 5–15 processor mounted on a farm tractor, which method is used in Poland. Measurements were conducted in pine, fir and spruce stands, which underwent early and late thinnings. During harvesting, a time study was performed using the continuous reading method. On completion of felling works, the volume of timber harvested was measured.
The efficiency and unit costs of timber harvesting were calculated in the operational working time for the chainsaw operator and processor operator.
In all analysed stands, significantly higher efficiency was observed in late thinnings than in early ones. This resulted in higher economic effectiveness of this technology in the thinnings of older age classes. The approximation of regression functions allowed for the prediction of fixed unit costs and efficiency depending on the average volume of trees being removed. The low share of fixed costs in the costs of exploitation by processor proves that a longer shift only affects to a small degree the economic effectiveness of the analysed technology.

Keywords
timber harvesting; thinnings; processor; costs; productivity

Hrčak ID: 18252

URI
https://hrcak.srce.hr/18252

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