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Ishak Sumantri
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Journal : Jurnal Penelitian Hasil Hutan

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MANIPULASl POLA SADAP UNTUK MENINGKATKAN BASIL GETAH POHON AGATIS (AGATHIS SP.) Ishak Sumantri; Dulsalam Dulsalam
Jurnal Penelitian Hasil Hutan Vol 9, No 1 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1873.906 KB) | DOI: 10.20886/jphh.1991.9.1.1-4

Abstract

Thia ptJPB preaenta  the  re1ult1 •of  invatifOtion   on tapping  design1 manipulation   to increae   relin• yield  of  A,aihiaap. cawied  out  in  Wono10bo  Sub  Fore1t  Diatrict,  Purworejo  Fore1t  District,   Unit 11 Perum  Perhutani  Central  Java, in 1989. The objective   iB  to  (ind  out  the  tapping  design  that  can increaae retin  yield.  For  thit  purpo•,    the 1lanted and horizontal tappi1111 daigna  were applied. Data   obtained   were  analysed   by  uaing neated  desilnl   with  2 x 6 'x 4 (acto1'1. The retult•are as foUowa :                                                                                                                                                                                                                                                                   I.  An  awrage  reain yie1d of  .Agathia ap. in  Wonoaobo  Sub  Foreat District was 2.4 7 gram/tree/day   with  the ro111e  between O. 71 and 8.29  gram/tree/day.2.  The Average  rain   y1Bld1  of  Alatbia   1p. uting 1lanted and horizontal  tapping  design1 were 2.80 and 2.66 gram/tree/day, re1Pectively.3.  The  average rain   yield•  of  Agathia 1p. in February,  .March, April,  .May and  June  were  1.88,  2.62,  2.62,  2.66 and 2.69 1n1m/tree/day,   rapectively.                                                                                                                               .4.  The  average  rain   yields  of  Agathia  1p. at  the  fir•t,  second,  third  and  fourth   tappings  were. 2.36,  2.46,  2.63  and  2.66 gram/tree/day,   respectively.5.  The  rain  yields among  tapping  months  were different   significantly   while the resin yields either  between  tappfn6  deligna or  amorw  tapping  (requencie1   were  not  Bignificantly  different.   Compered   to  relin  yield  of  horizontal   tappin6  de.Wn. the rain  yield  of 1lanted ta~ping deBign wa• 16% higher.
ANALISIS.KERAPATAN JALAN HUTAN BERDASARKAN HASILPENAFSIRAN FOTO UDARA DAN SURVEl LAPANGAN: STUDI KASUS PT.INHUTANI II Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (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.1991.9.2.53-58

Abstract

Forest road network has a very important role in tranaporling logs fram the frest to processing site or logyard. The investigation of forest road density by using theaerial photo of l : 20.000 and 1: 60.000 scales had been conducted.The scope of the aerial photo is the second five-year working plan of PT. lnhutani 11 Pulau Laut, South kelimanten. The results are. as follows :1.Based on aerial photo interpretation, forest road density is 7,6 m/ha.2.Based on average skidding distance, and road construction and road maintenance costs, road denvities ha and 17,4 m/ha. respectively.3. Actual forest road density in PT. lnhutani II forest area is not optimum yet because it is far less than optimum values resulted from calculation based on average skidding distance and road construction and maintenance costs.
HUBUNGAN ANTARA DIAMETER POHON DAN PRODUKSI GETAH DALAM PENYADAPAN GETAH AGATHIS spp 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.1991.9.6.229-231

Abstract

This paper presents  the resull an invaligation of the relationship between tree diameter and copal production in the Agathis spp tapping. Copal lappings were done using slanted and horizontal tapping patterns on the Agathis trees having diameter between 24 and 40 cm with the age of 20 years.The  results  of data analysis are as follows  :1. At the even  age  Agathis  trees, there was no relationship  between tree diameter and copal production.2.Viewing from the  coefficient of determination,  the contribution of slanted tapping pallern was 12% and horizontal tapping pattern  was  1%. Other  factors  that may affect  copal production are the color of bark and leaf,  crown size and the direction of resin canal.3.Better  relationship between diameter and copal production may  be obtained if the size   of  tapping quare  is proportional  to tree diameter/perimeter.4.Further investigation, by including other variables, is suggested in order to formulatete better relationship.
PENYADAPAN GETAH PINUS MERKUSII DENGAN MENGGUNAKAN BEBERAPA POLA SADAP DAN TINGKAT KONSENTRASI ZAT PERANGSANG Ishak Sumantri; Wesman Endom
Jurnal Penelitian Hasil Hutan Vol 6, No 3 (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.1989.6.3.152-159

Abstract

Three  methode for  tapping pine tree resin.  i.e.,   3 x 4  cm,  1,5 x8 cm and Indian  tapping  method   were investigated  in Cianjur Forest  District  in  1988.   To  increase  the  resin yield,  sulphuric  acid  (H2S04)   with  0%, 15  %, 25 %, and 35 % con- cetratation   were  used.  Each  tapping  method   was applied  on  fourty   pine  trees.  The  results  are as fallows  :1.Using stimulant   with  the  three  methods   of  tapping  increase  the  resin yield.               2.From   the.  three   tapping   methods   applied,   Indian   tapping  method   showed   the  highest  resin  yield,    i.e.   12. 72 gram/tree/day.3.Indian   tapping   method   gives  Rp  5/kg  profit.   This  value  was found   by  subtracting   selling  price  (Rp,   150/kg)   with production  cost  (Rp.   145/kg).
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 | 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. 
PERUBAHAN PENGGUNAAN LAHAN HUTAN SEKITAR SUNGAI KAMPAR, RIAU Ishak Sumantri; Machfudh Wesman E; Haryono Haryono
Jurnal Penelitian Hasil Hutan Vol 4, No 3 (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.1987.4.3.10-16

Abstract

This study is to evaluate the trend of forest  land-use change as a result of  the community's   activities in pursuing  its need for settlement  and land cultivation  in forest  land in the vicinity of Kampar  river, Riau. To understand the trend of forest  land utilization change, 4 data resource references including aerial photo 1964, general view of 1974 forest  map,  1982 land use map, and a ground  check in 1984, have been used. During two periods i.e., in the years from 1964 to 1974, and from  1974 to 1984, it is known  that an invation  occured into both limited production  forest and conversion forest  in the Sub Districts of Kampar Kiri and Sengingi. An analysis of data, using "population  pressure"  and  "location-quotient formulation"  technique shows  that population  pressure  and low income  causes invation  into  the forest  areas
PENGGUNAAN FOTO UDARA DALAM PENILAIAN KERUSAKAN TAJUK AKIBAT EKSPLOITASI HUTAN Ishak Sumantri; Wesman Endom
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): 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.1988.5.2.85-92

Abstract

An investigation of the impact of logging operations on crown damage by using the aerial photograph  of forest  areas of PT. INHUTANI II in Pulau Laut, South Kalimantan was carried out.The results of the investigation lead to the following conclusions:1.  Panchromatic   black and white  aerial photograph of 1:20.000 scale is good  enough  to  use for  evaluating  the damage of dominant and codominant crowns and crown  closure of the trees. It is found that  the crown of  11 trees/ha  were damaged, consisted of 9 tree crowns were damaged partially and  2  tree crowns  were damaged  totally.2.   Steeper terrains  caused  larger decrease  of  crown closure  of  the  trees. On  the slope  of  0-15%,  25-45% and 45%  and above, the  crown  closure  reductions   were  61%, 76%  and 80%,  respectively
PENINGKATAN PRODUKTIVITAS DAN EFISIENSI PENEBANGAN KAYU MANGIUM DI SATU PERUSAHAAN HUTAN TANAMAN DI PROPINSI JAMBI Sona Suhartana; Marolop Sinaga; Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 22, No 3 (2004): 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.2004.22.3.175-182

Abstract

Implementation  of  felling  technique in the timber  estate is not  yet practiced  efficiently and appropriately.  Study  on  the lowest possible felling  technique  (LPFT) is considered  important to increase fellingproductivity and felling  efficiency. This study was carried out at a timber estate  in iambi  in 2003. The aim of this study was to determine the effectof LPFT on fellingproductivity and efficiency.Data collected in this regard were: working time,  wood volume, productivity,  efficiency, stump height and felling  cost.  Two-categories data were analyzed with respect to their possible differences using a t-test.Results revealed that implementation of LPFT brought out more convenient impacts in comparison  to  the  conventional felling   technique  (CFT),   as follows:   (1)   Felling  productivity increased  at  3.177  m3/hr;  (2) felling efficiency  increased  approximately  7.4%;  (3) felling cost decreased by some Rp 159.1;   and (4) the average stump height were 21.14  cm for LPFT  and 32.83 cmforCFT
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.
Co-Authors Arifin Suzanto Dulsalam Dulsalam Haryono Haryono Machfudh Machfudh Machfudh Wesman E Marolop Sinaga Sona Suhartana Sukanda Sukanda Wesman Endom