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Ishak Sumantri
Pusat Penelitian dan Pengembangan Hasil Hutan
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PENINGKATAN PRODUKSI LAK MELALUI PERBAIKAN SISTEM PEMUNGUTAN Ishak Sumantri; Arifin Suzanto; Haryono Haryono
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 | DOI: 10.20886/jphh.1989.6.6.392-397

Abstract

An investigation on lac cultivation was carried out in Probolinggo Forest District in September 1988. The purpose is to find possible ways of increasing the production. Host trees and methods for lac cultivation were observed. The results reveal that: Kesambi trees are good as the host for lac cultivation because they have sap density of 0.16 and sap reaction of 0.59 which which condition is favorable for lac survivals.Higher lac production can be obtained by using host trees that have many branches and twigs. Therefore, host trees need to be pruned in order to provide many new branches and twigs.Lacquor secretion yield can be harvested 5 months after lac cultivation. The lacquor production, thew is sorted intolacquor for cultivation and industrial materials. The cultivated lac can produce lacquor to the amount of three to five fold, depending on the quality of lac cu1tivated and the existance of diseases. 
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 | 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.
KAJJAN PEMANENAN TERHADAP KERAPATAN TEGAKAN DI BAGIAN HUTAN ALAM TROPIS PROPINSI LAMPUNG Wesman Endom; Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 9, No 6 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1991.9.6.219-228

Abstract

This  paper  studied  the  logging  impact  on forest  density  in  a forest  concession   in  Province  of  Lampung,   38 sample  plots  were taken consisting  of  22 plots  located  in  virgin/not  yet logged  and  16 located  in logged  over  area.  The  result show  that :1.The  initial potential   of  forest  area  can  be  classified  as moderate,   with  composition   of  commercial   wood  of  Dipterocarpaceae   43.9%, 14.4%  Non  Dipterocarpaceae   and  the rest 41.3%  of  non  commercial   species.  The  average  volume  of  commercial   wood  per  hectare  of diameter  class 50 cm  and  up  ranged  from  6 -  42 m3,    and for  diameter  class 20 -  50 cm  ranged  from   7 -  48 m3  per  hektar.   The forest density  of  those  two  diameter  classes  varied from   4 -  16  trees and  16  -  64 trees per  hektar,   respectively.2.Forest   logging   operation    has   reduced   the   volume    and   number    of   commercial    trees   per   hectare   (Dipterocarpaceae    and   Non Dipterocarpaceae)   at about  50%  and  38%  respectively.Compared  to TPTI  (Indonesian  Selective  Cutting System)  it was found   that this condition  can not meet  the TPTI  requirements  for  nucleus trees for  the next  cutting  cycle.3.The  logging  operation  has caused  the openings  of  land  cover  at about  30.54%  per  ha or similar  to an area 3054 m2  per  ha
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 | 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.
Co-Authors Arifin Suzanto Dulsalam Dulsalam Haryono Haryono Machfudh Machfudh Machfudh Wesman E Marolop Sinaga Sona Suhartana Sukanda Sukanda Wesman Endom