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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management
I.G.K. Tapa Darma
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Agriculture, Biological Sciences & Forestry

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Effect of Blue Stain on the Toughness of Benguet Pine (Pinus Kesiya Royle Ex. Gordon) Wood I.G.K. Tapa Darma
Jurnal Manajemen Hutan Tropika Vol. 10 No. 1 (2004)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

Kualitas kayu pinus Beunguet dipengaruhi oleh banyak faktor, diantaranya serangan blue stain sangat mempengaruhi sifat-sifat kayu seperti keindahan dan ”daya tahan beban tiba-tiba” (toughness) kayu serta mengurangi nilai jual dan pemasaran kayu. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh serangan blue stain terhadap daya tahan beban tiba-tiba dari kayu pinus Benguet (Pinus kesiya Royle ex. Gordon) pada berbagai periode inkubasi. Ternyata hasil penelitian ini menunjukkan daya tahan beban tiba-tiba kayu pinus Benguet yang diserang blue stain baik yang diinkubasi selama satu bulan maupun dua bulan atau kontrol tidak menunjukkan perbedaan yang nyata. Meskipun demikian, ada indikasi yang ditunjukkan oleh waktu inkubasi, semakin lama kayu diinkubasikan maka semakin berkurang daya tahan beban tiba-tiba dari kayu.Keywords: Pinus kesiya Royle ex. Gordon, blue stain, toughness
Ketahanan Komposit Kayu Plastik Polistirena terhadap Serangan Jamur Pelapuk Coklat Tyromyces palustris Darma, I.G.K. Tapa; Hadi, Yusuf Sudo; Atmojo, Andri Tri
Jurnal Manajemen Hutan Tropika Vol. 8 No. 1 (2002)
Publisher : Institut Pertanian Bogor (IPB University)

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Wood specimens, 50 x 25 x 15 mm were impregnated in styrene and vinil acetate solutions at four concentration levels, using tertbutyl hydroperoxide as acatalyst. The specimens were dried at 60°C for 48 hours after which the solution was polymerized in situ. All specimens, including untreated specimens as control and specimens impregnated with Impralit CKB, were exposed to monoculture a brown rot fungus Tyromyces palustris, a brown rot fungus for 3 months. All wood polymer composite (WPC) specimens obviously showed higher resistance compared with the control. At four concentration levels, WPC of tusam showed excellent result with weight loss value less than specimens treated with Impralit CKB. WPC of karet (Hevea brasiliensis Muell. Arg) and sengon (Paraserianthes falcataria) showed good resistance at high styrene concentration level.
Some Factors Affecting Seed Viability of Leucaena leucocephala (Lmk. de Witt.) Darma, I.G.K. Tapa
Jurnal Manajemen Hutan Tropika Vol. 9 No. 1 (2003)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

This study objective to determine (1) when appropriate harvesting peas, (2) methods of seed extraction by drying, (3) fungal pathogen attack young Leucaena leucocephala seed pods. Time proper harvesting is 62 days after flower buds. At this time reached the highest seed germination of 97.25%. Drying by blowing warm air without producing the lowest open pods compared with a gust of air drying with hot air blowing, the number of pods open: 20% of the pods No. 9; 21% of the pods No. 10; and 41% of the pod No .11 with the relative seed germination highest compared with other drying the second consecutive 87.13%, 44.25%, and 19.75%. However, the germination of seeds from the seed extraction method by blowing air without heating is still lower than the control. Pathogen fungus that attacks the seeds were Aspergillus sp. Alternaria sp., Pythium sp., and one unidentified species.
Co-Authors Andri Tri Atmojo Yusuf Sudo Hadi