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Sona Suhartana
Forest Products Research and Development Center
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ANALYSIS OF USING EFFICIENT LOGGING TOOLS AT PT. PURWA PERMAI IN CENTRAL KALIMANTAN Sona Suhartana; Yuniawati Yuniawati
Indonesian Journal of Forestry Research Vol 5, No 1 (2008): Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2008.5.1.53-64

Abstract

A high log demand that often exceeds its supply capability should be overcome by using appropriate logging  tools. Numerous  kinds and types of logging  tools require  a well planning in their utilization. Number of tools which are greater or fewer than what is actually needed can be disadvantageous  for a company. In relevant to these aspects, a study was carried out at a timber estate in Central Kalimantan  in 2007. The aim of the study was to find out an efficient number  of tools used for logging  in a timber  estate. The analysis was based on the target and realization of the company’s log production. The result revealed that: (1) Optimum number of logging tools depended on production target,  i.e. 41 units  of chainsaws  for felling,  42 units  of farm tractors  for skidding,  9 units of loaders for loading and unloading, and 36 units of trucks for transportation; (2) Number  of logging tools as obtained from all activities  in the field was fewer than that from  the analysis based on production target and realization. This condition  indicated that number of logging tools used in the company was not yet efficient.
LOWEST POSSIBLE FELLING TECHNIQUE FOR INCREASING UTILIZATION OF RENGHAS (Gluta renghas L.) WOOD AT A PEAT SWAMP FOREST Sona Suhartana; Yuniawati Yuniawati
Indonesian Journal of Forestry Research Vol 3, No 2 (2006): Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2006.3.2.105-113

Abstract

This study was carried out in 2005 at a peat swamp forest company in Jambi. The aim of this study was to find out a technique to increase the utilization of renghas wood in a peat swamp forest by implementing the lowest possible felling technique (LPFT) and  the conventional felling technique (CFT). Data collected in this study were: working time, log volume, waste volume, productivity, efficiency, stump height and felling cost. Two data categories were analyzed with respect to their possible differences by using a t-test.The study showed that the implementation of LPFT produced better results compared to that of CFT which was indicated by: (1) Felling productivity increased to 5.220 m3/hour, (2) Felling cost decreased Rp 341/m3, (3) Felling efficiency increased 3.2%, and (4) The average stump heights were 41.2 cm for LPFT and 67.5 cm for CFT.
TWO FELLING TECHNIQUES AND FELLER POSTURES FOR INCREASING THE UTILIZATION OF GMELINA WOOD (A case study at two timber estates in East Kalimantan) Sona Suhartana; Yuniawati Yuniawati
Indonesian Journal of Forestry Research Vol 3, No 1 (2006): Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2006.3.1.31-40

Abstract

Fellingis an early step in timber utilization process. Efficiencyand effectivity of felling technique, tool type and feller posture will affect the whole timber utilization efficiency. This study was carried out at two timber estates in East Kalimantan and intended to see the effect of two felling techniques and feller postures on felling productivity, fellingcost, as well as timber utilization efficiency.Primary  data collected in this research  included :  felling time, volume  of  felled timber, productivity, felling efficiency, stump height and felling cost. The data was analyzed using split-plot design with factorial pattern.The result showed that the implementation of lowest possible felling technique (LPFI) increased log production from 14.4  to 17.7%. The lowest stump height left was of  the one using LPFf  with particular bowed posture in PT. Sumalindo Lestari Jaya I (SLJ I) (4.82 cm).
Co-Authors Yuniawati Yuniawati