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Znanstveno-stručno i staleško glasilo
Hrvatskoga šumarskoga društva
Journal of Forestry Society of Croatia
      Prvi puta izašao 1877. godine i neprekidno izlazi do današnjeg dana
   ISSN No.: 0373-1332              UDC 630*
upute autorima


Should forest pay for everything?     pdf     HR     EN 5
Tomislav Poršinsky, Vlado Petreković, Andreja Đuka UDK 630* 523 (001)
Bark thickness of wild cherry in timber scaling     pdf     HR     EN 7
Stjepan Kvesić, Dalibor Ballian, Mirzeta Memišević Hodžić UDK 630* 164 (001)
Leaf variability of field maple populations (Acer campestre L.) in Bosnia and Herzegovina     pdf     HR     EN 15
Osman Mujezinović, Kenan Zahirović, Milivoj Franjević, Mirza Dautbašić UDK 630* 443 (001)
Trophic preferences and influence of beech weevil on the damaged leaf area of beech trees in Bosnia and Herzegovina     pdf     HR     EN 27
Sercan Gulci UDK 630*360 (001)
Productivity of a farm tractor with single drum winch during whole-tree timber extraction     pdf     HR     EN 35
In forested areas with difficult terrain conditions the cost of forest harvesting operations is of great importance. This situation affects the technology standards of tools and equipment used in forestry operations. Especially in developing countries modified farm tractors are widely used as effective tools for transporting timber from stump to landing areas. In this study, productivity of the farm tractor with front-mounted single drum winch designed for multipurpose use in forestry operations was evaluated during whole-tree harvesting operation. The total cost of used system (tractor and winch) is approximately 19580 € (Euro). Time and motion study was implemented by using repetitive time measurement technique during two step timber extraction operation. The effects of main factors such as tree diameter, height, volume, and skidding distance on the total operation time were investigated and then linear regression analysis was performed to develop the mathematical models for whole-tree extraction methods. Time study data resulted that winching trees to the prebunching area was the most time consuming work stage in uphill winching method while skidding trees backward to landing was less time consuming work stage in skidding method. The average productivity of uphill winching and skidding whole-tree was as 12.98 m3/hour and 14.30 m3/hour, respectively. The cost of uphill winching and skidding was 10.77 €/hour and 11.87 €/hour, respectively. It can be concluded that the single-drum hydraulic system, which is mounted on the front of the tractor, can be used as an alternative harvesting equipment especially for uphill winching operations in small scale forestry operations.

Key words: Mountainous forests; forest harvesting; farm tractor; productivity; whole-tree method; developing countries
Vania Kachova, Angel Ferezliev UDK 630*261 (001)
Improved characteristics of Populus sp. ecosystems by agroforestry practices     pdf     HR     EN 45
Natalie Levandovska, Jaromir Kolejka, Božena Šera, Hubert Zarnovičan UDK 630* 270 + 907
The recreational potential of urban forests – an application of the assessment method     pdf     HR     EN 53
Zvonimir Ištvan UDK 630* 902
145 year of forestry in Podravina     pdf     HR     EN 65
Drago Biondić UDK 630* 762 + 799
Integral performance index of small and medium wood industrial financial products     pdf     HR     EN 75

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