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Ridwanti Batubara
Program Studi Kehutanan, Fakultas Pertanian, Universitas Sumatera Utara, Jl. Tri Dharma Ujung No. 1 Kampus USU Medan 20155
Agriculture, Biological Sciences & Forestry

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PEMANFAATAN DAN PEMASARAN ROTAN OLEH MASYARAKAT KABUPATEN SAMOSIR (Studi Kasus di Desa Huta Galung, Kecamatan Harian, Kabupaten Samosir) Ricky Situmorang; Ridwanti Batubara; Yunus Afifuddin
Peronema Forestry Science Journal Vol 2, No 2 (2013): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Rattan (Calamus sp) is a forest plant that has many benefits for forest communities and a source of  foreign exchange. This study aims to known the utilization of rattan by the community, determine income from the use of rattan and non rattan and to analyzed the marketing of rattan. This research used field surveys and interview to the community. Based on research conducted known pattern rattan harvesting is done by rotation. Income from rattan smaller than non-rattan with the percentage utilization of rattan 43.8%, while non-rattan 56.20%. Marketing rattan starting from rattan farmers sell rattan to collector and collector which will sell directly to craftsmen. Keywords: Rattan, Income, Marketing
Increasing Oleoresin (Pinus merkusii) Productivity with Physical Treatment Modification and Time of Tapping in Riil Method Wilna Fikriyah Hasibuan; Ridwanti batubara; Muhdi Muhdi
Peronema Forestry Science Journal Vol 3, No 1 (2014): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Pinus merkusii is one of endemic in North Sumatera, especially in the north. Pine has a very impotant role, whereas beside as a pioneer plant, pine also produces resin which if we process it more, it will has higher economic value. The purpose of this research were to knowing the influence between time of tapping with physical treatment modification in riil method of oleoresin productivity. In this research, the physical treatment used were by hitting (without hitting, 10,20, and 30 times hitting). The result of this research showed that 10 times hitting were different than 20 and 30 times hitting, while 20 and 30 times hitting were not different. The highest amount of oleoresin productivity were from 10 times hitting (1,428 kg/tree/year) which showed that physical treatment of 10 times hitting were better than 20 and 30 times hitting. The times of tapping 3 days at once was very different with the times of tapping 5 and 7 days at once, while the times of tapping 5 and 7 days at once were not different. The times of tapping 3 days at once has a significant influence and it was the best times of tapping for increasing oleoresin productivity.Key words : Pinus merkusii , resin, riil method, times of tapping
(The Application of H2SO4 As Stimulant To Increase The Productivity of Oleoresin (Pinus merkusii Jungh et de Vriese) With Riil Method Ayu Rahayu Effendi Surbakti; Ridwanti Batubara; Muhdi Muhdi
Peronema Forestry Science Journal Vol 3, No 1 (2014): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

The Production of oleoresin is affected by the application of stimulant and time of tapping. The purpose of this research were to know the effect of H2SO4 stimulant and the time of tapping to P. merkusii and to know the H2SO4 concentration and the best time of pine tapping that gave the best of tapping. This research were carried at working area of PT. Inhutani IV, Siborong-borong in Mei – June 2013 using factorial randomized block design with two factors, i.e. the concentration of stimulant (0%, 10%, 20% and 30%) and time of tapping (3, 5 and 7 days at once). Parameter measured were production of oleoresin (gram). Result of this research showed that the application of H2SO4 stimulant on the tapping of pine trees increase considerably to oleoresin. The application of H2SO4 resulted in more than 2 – 4 times the yield of oleoresin from tree without stimulant. The concentration of H2SO4 (30%) and the time of tapping in 3 days can gave the best product of oleoresin.Key word : P. merkusii, resin, stimulant, tapping.
The Inhibition Test of Extract Paku Pohon (Cyathea contaminans (Hook.) Copel.) To Fungi Microsporum gypseum In Vitro Citra Dewi Turnip; Ridwanti Batubara; Herawaty Ginting
Peronema Forestry Science Journal Vol 3, No 1 (2014): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

This study aims to determine the effect of inhibition extract paku pohon (Cyathea contaminans (Hook.) Copel.) to fungi Microsporum gypseum, the fungus causes skin disease, horn or keratin-eating substances, as well as damage the nails and hair. The method of the study was in vitro test by paper disc method. The extracts were diluted into concentrations of 500 mg / ml, 400 mg / ml; 300mg/ml; 200mg/ml; 100mg/ml, until 10 mg / ml for M. gypseum tests respectively. Each petri dish added 0.1 ml of inoculum was added 15 ml of Potato Dextrose Agar media that has been thawed sterile and wait until the temperature reaches 4500C, respectively disc subsequent paper that has been soaked in various concentrations of extract for 15 minutes, put on the media , incubated at a temperature of 20-250 ° C for 48 hours. Inhibitory regions surrounding diameter of disc was measured using calipers paper. Tests carried out 3 times. Performed using DMSO4 blank. The results showed a significant effect on paku pohon extract the inhibition of fungal M. gypseum which starts at a concentration of 400 mg / ml and the smallest inhibition at concentrations of 300 mg extract / ml. The smallest concentration is the value of Minimum Inhibitory Concentration (MIC).Keywords: Cyathea contaminans (Hook.) Copel., extract Paku pohon, M. gypseum.
Durability of Modified Fiber Plactic Composite (FPC) Against Marine Borer Ade Dwi Fonna Rizki; Luthfi Hakim; Ridwanti Batubara
Peronema Forestry Science Journal Vol 3, No 1 (2014): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

The Fiber plastic composite (FPC) board that made from corrugated paper fiber and plastic polypropylene with maleic anhydride (1 % and 2 %) as compatibilizer and benxzoil peroxide (15 %) as initiator (modified). The purpose of this research were to evaluate the quality of the physical properties of modified FPC board, identification kinds of marine borer, and the durability against marine borer. The physical properties was based on JIS A 5905-2003 and JIS A 5908-2003. The durability of modified FPC board against marine borer was based on SNI 01-7207-2006. The Modified FPC board was soaking in the sea of Port Belawan, Medan for six months.The results showed the physical properties of modified FPC board were full fil the standard JIS A 5905-2003 and JIS A 5908-2003. The durability of modified FPC board against marine borer according SNI 01-7207-2006 was classified into very durable and durable. The marine organism which found on modified FPC board were 17 specieses but only 2 specieses classified as marine borers, there are Limnoria sp and Teredo sp. After the split test was known that the pattern of attacks on the modified FPC board is Martesia striata's attack patterns of pholadidae.Keywords: FPC, Marine Borer, Modified, Physical Properties, Sea Of Port Belawan
Co-Authors Ade Dwi Fonna Rizki Ayu Rahayu Effendi Surbakti Citra Dewi Turnip Herawaty Ginting Luthfi Hakim Muhdi Muhdi Ricky Situmorang Wilna Fikriyah Hasibuan Yunus Afifuddin