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Ishak Sumantri
Pusat Penelitian dan Pengembangan Hasil Hutan
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Journal : Jurnal Penelitian Hasil Hutan

 1   2 
KERUSAKAN TEGANGAN TINGGAL AKIBAT PENYARADAN DENGAN TRAKTOR PADA BERBAGAI TINGKAT KERAPATAN TEGAKAN Dulsalam Dulsalam; Sukanda Sukanda; Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 6, No 6 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3496.953 KB) | DOI: 10.20886/jphh.1989.6.6.349-352

Abstract

An  investigation   on  residual   stand  damages  caused  by skidding  tractor  on several stand  density   levels was carried out  at PT Sumpol   Timber  in South  Kalimantan  in 1987.  Forty   five  sample plots  were selected  randomly  in this research. The purpose   is to gather  information   about  the resdiual stand damages caused by skidding  tractor on several stand density levels.   The  result  of  investigation   reveals that  :                                                                                                                                                                                              1.  The number    of  trees  having   diameter   of  20  cm  and  up  varies   from  80   to  300  trees/ha  with  an  average of  190.22 trees/ha.                                                                                                                                               2.  The  residual stand  damages  for  the  area with  stand  densities  ot < 150,  150 -199,   and >  200  trees/ha  were 16,  7, 28.3,and  39. 0 trees/ha,  respectively.   They  are significantly   different.3.  It  is suggested  that   the  skidding   operations,    especially   in  high  stand  density   levels, be done  with  better  planning   in-order  to save powers,  costs  and  resources.
PERBAIKAN SISTEM PEMUNGUTAN LAK DALAM RANGKA PENINGKATAN PRODUKSI Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 10, No 2 (1992): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (14075.141 KB) | DOI: 10.20886/jphh.1992.10.2.63 ~ 68

Abstract

 A  research   on   the  improvement    of  lac harvesting  system   had  been  conducted  in Probolinggo   Forest Districts. Unit  II Perum  Perhutani,   East  Java.  Harvesting  system  and plantation site  were observed  to  find   higher  lac production.The result are as follows  :  -- The  selective  system is  better  than  total  cut  system   in producing lac.--The plantation on  top  of  the  hill produce   more  lac than  other  places  due  to  the  richness  of sun  shine.
Co-Authors Arifin Suzanto Dulsalam Dulsalam Haryono Haryono Machfudh Machfudh Machfudh Wesman E Marolop Sinaga Sona Suhartana Sukanda Sukanda Wesman Endom