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Machfudh Machfudh
Pusat Penelitian dan Pengembangan Hasil Hutan
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Journal : Jurnal Penelitian Hasil Hutan

 1 
PENGARUH TEKNIK PENYADAPAN TERHADAP PRODUKSI GETAH AGATHIS DI BALI Ishak Sumantri Sumantri; Dulsalam Dulsalam; Machfudh Machfudh
Jurnal Penelitian Hasil Hutan Vol 4, No 4 (1987): 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.1987.4.4.63-66

Abstract

There are many kinds  of Agathis sp.  having specific bark thickness  in Indonesia. For example, at Buleleng Forest District Bali, where the investigation  was carried out,  there are two groups of Agathis sp. The first  group is Agathis  sp. known  to have bark thickness greater than one cm, and the other group belongs to thin bark ( < 1cm). The bark thickness  of Agathis   sp. has a bearing on the resin yield. The resin itself  is always coagulated  quickly, there by requiring special treatment  to produce  optimal  resin yield. This investigation  is intended  to select the Agathis sp. producing optimum  resin yield  and to increase the resin output by applying  new tapping  technique. This study  reveals that:The resin yield of Agathis sp. in Bali was quite low. It ranges from 0.1 gram to 24.6  gram/tree/week  with approximately   3.8  gram/tree/week average.Agathis sp. with  thick bark give higher resin yield than those of thin bark.  The average resin yield of thick bark Agathis sp, was 6.3  gram/tree/week,  while it is only 1.3  gram/tree/week   for thin bark.The  V-shape tapping  method  give resin yield  approximately  80% higher than the reverse  V-shape.The application  of H2SO4 10% as stimulant did not give significant effect on the resin production. Based on the  average resin yield  data, however, the resin yield  was actually  increased approximately  26%   when the H2S04 were added compare  to  the control. 
PENGKAJIAN PARAMETER FUNGSI VOLUME POHON MELALUI FOTO UDARA DI KALIMANTAN TIMUR Ishak Sumantri; Haryono Haryono; Machfudh Machfudh
Jurnal Penelitian Hasil Hutan Vol 1, No 3 (1984): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (29063.393 KB) | DOI: 10.20886/jphh.1984.1.3.22-33

Abstract

 The relationship  between   tree crown  diameter  and/or  tree height which  measured from aerial photos in tropical rain forest is the  object  of this  study. Result of model  analysis  by crown  diameter  and  tree height  variable are as follows   :In  the  harvested primary  forest  condition, the  most  appropriate  model  for all tree samples  is :   Y  =   30,615 -1,580 D + 1,247 T + 0,037 D2 -0,021 DT               with  coefficient   correlation  r =  0,9637.The  most  appropriate  model  by  crown  diameter  variable in the  harvested   primary  forest  condition   for all trees samples  is  :           Y = 1,732  + 0,214 D  with  r =  0,2971.          For Meranti  species,  the  most  appropriate  model  is :          Y = 6,684 - 0,555 D + 0,020 D2 with  r = 0,664  and for Ulin species is:          Y = -  37,736 + 2,738 D -  0,036 D2  with  r = 0, 776.      3. The  model  and  its analysis are valid for  East Kalimantan  only. 
Co-Authors Dulsalam Dulsalam Haryono Haryono Ishak Sumantri Ishak Sumantri Sumantri