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Peronema Forestry Science Journal
Published by Universitas Sumatera Utara
ISSN : -     EISSN : -     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Arjuna Subject : -
Articles 304 Documents
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Pengaruh Perlakuan Pengarangan dan Penambahan Partikel Kemiri Terhadap Kualitas Paving Block ( Frederick Raymond; Tito Sucipto; Irawati Azhar
Peronema Forestry Science Journal Vol 4, No 2 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

This experiment aims to determine the quality paving block with the addition of kemiri particles with carbonization treatment, evaluate the effect of adding particles and carbonization treatment and determine the number of particles and optimal treatment. Variations of these purpose was the particle composition (5%, 7%, 9%) and carbonization treatment. Characteristics of the paving block with treatments based on SNI 03-0691-1996 particle composition and carbonization treatment is from 24,21 to 62,53 MPa compressive strength (quality A-B), water absorption 1,89% - 2,79% (quality A), resistance to sodium sulfate 1,72% -2,82% (defects) and porosity of 1,31% - 5,67%. The treatment takes significant effect on the compressive strength, resistance to sodium sulfate and porosity but did not significantly affect the water absorption. Based on the results of analysis of variance, optimal treatment is the particle composition 7% with treatment without carbonization.Keywords: paving blocks, kemiri shell, carbonization, particle composition, quality.
Pengaruh Kadar Perekat Urea Formaldehida Terhadap Kualitas Papan Partikel dari Kayu Gamal (Gliricidia sepium Jonyal Periandi Sitanggang; Tito Sucipto; Irawati Azhar
Peronema Forestry Science Journal Vol 4, No 2 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

The stalk of the gamal wood is one of potential raw material for manufacturing particleboard. The purpose of this study was to evaluate the effect of urea formaldehyde adhesives content on physical and mechanichal properties of the particleboard and to determine the optimum urea formaldehyde adhesives content for the gamal particleboard. Particleboard were made with size 25 cm x 25 cm x 1 cm with density of 0,8 g/cm3. The particleboard be pressed by 1200C temperature during 8 minute with pressure 25 kg/cm2. Result showed the treatment of adhesive content have significant influence on moisture content, water absorption, thickness swelling, modulus of rupture (MOR) and internal bond (IB) gamal particleboard. The optimum treatment of urea formaldehyde adhesive content is 11%.Key words: Gliricidia sepium, particleboard, adhesive content, quality
Variasi Pelapis Luar dan Berat Labur Perekat Phenol Formaldehida terhadap Kualitas Papan Lamina dengan Inti dari Batang Kelapa Sawit Rasi Odesto Tarigan; Tito Sucipto; Rudi Hartono
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Laminated board of oil palm trunk made with variations outer layer plywood 3 mm (P1), plywood 6 mm (P2), and high density of oil palm trunk (BT) with the configuration which is P1-BT, P1-P1, P1-P2, P2-BT, and P2-P2. In addition, by using a variation of phenol formaldehyde adhesive glue spread between 240g/m2 and 260g/m2. The maturation of the adhesive is done using a hot press with a temperature of 150 oC for 15 minutes. This study used a completely random experimental factorial design with 2 factors and the results were compared with the JAS 243:2003 standard.The results of this study among others density, water content, water absorption in immersion for 2 hours and 24 hours, thickness swelling on immersion for 2 hours and 24 hours, delamination ratio, MOE and MOR were 0,48-0,62 g/cm3, 9,73-11,36%, 23,55-33,57% and 72,62-85,27%, 3,64-8,64% and 8,32-15,04%, 0%, 31.402-47.533 kg/cm2 and 254,17-374,25 kg/cm2. Water content, the ratio of delamination and largely MOR value fulfilled JAS 243:2003 standard.The best of outer layer and phenol formaldehyde adhesive glue spread by JAS 243:2003 standard and results of the analysis range for the laminated board with oil palm trunk as a raw materials in general was P2-BT (plywood 6 mm and high density of oil palm trunk) and glue spread was 260 g/m2.Keywords: laminated board, oil palm trunk, outer layer, glue spread, phenol folmaldehyde.
Kualitas Papan Semen dari Partikel Serutan Pensil dengan Berbagai Rasio Semen dan Partikel Desi Natarina Sembiring; Luthfi Hakim; Tito Sucipto
Peronema Forestry Science Journal Vol 4, No 2 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Cement-Bonded Particleboard made of pencil shaving industry waste has not developed in Indonesian. The main objective of this research was to evaluate the physical and mechanical properties of cement bonded from pencil shavings particles and determine the optimum cement-to-particle ratio. The treatment of cement/particle ratio were 90:10; 85:15; 80:20 and 75:25. Methods of this research were two steps curing. The first step was air curing using cold press for ±4 days and continued of second step was oven curing at 80̊ C for 24 hours. The result of the research showed that cement-bonded particleboard produced density value around 0,73-1,13 g/cm3, moisture content 8,37-12,16%, water absorption on immersion 2 hours and 24 hours around 23,78-43,48% and 27,33-51,90%, thickness swelling on immersion 2 hours and 24 hours around 0,79-1,82%  and 1,39-2,89%, modulus of elasticity around 114,21-880,17  kg/cm2, modulus of rupture around 7,32-18,52 kg/cm2 and internal bond around 0,88- 1,56 kg/cm2. The effect of cement/particle ratio on the research showed that 80:20 is very good compared from 90:10; 85:15 and 75:25.Key words: cement-bonded particleboard, pencil shavings particles, cement-to-particle ratio.
TINGKAT KESUKAAN MASYARAKAT TERHADAP TEH DAUN GAHARU (Aquilaria mallacensis Lamk.) DIBANDINGKAN TEH LAIN YANG BEREDAR DI PASARAN Roy Brema Ginting; Ridwanti Batubara; Herawaty Ginting
Peronema Forestry Science Journal Vol 4, No 3 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Agarwood leaves contain chemical compounds such as flavonoid, flavons, flafonols and isoflavones that can be use as a brewed beverage. That has a function as an antioxidant. The objective of this research was to determine the consumen preference on agarwood leaf tea compared other tea on the market. Types of tea on the market were used as a comparison is C. cinencis tea and soursop leaf tea. This study was made in 4 stages i.e plant sampling, making agarwood leaf tea, determination of tannin content, and evaluation of consumen preference on agarwood leaf tea by hedonic test on taste, aroma, and colour using 1-5 scale i.e (very unlike-very like) for agarwood leaf tea at 0 and 2 month of storage. The highest to lowest of tannin content was found in C. cinencis tea (0,5464%),agarwood leaf tea (0,2571%), and soursop leaf tea (0,0643%). In the 0 month storage preference level of society against agarwood leaf tea is favored as seen from the scores obtained in terms of taste, aroma and colour that is 3,72; 3,10; 2,42. For the agarwood leaf tea that has been storage for 2 month, agarwood leaf tea still favored where the score for taste, aroma and colour were 3,34; 3,04; 2,36.Key words: agarwood tea, consumen preference, and hedonic test
POTENSI PEMANFAATAN GAMBIR (Uncaria gambir Roxb) DI KECAMATAN PERGETTENG GETTENG SENGKUT, KABUPATEN PAKPAK BHARAT, PROVINSI SUMATERA UTARA Jeckson Fransiskus Sagala; Rudi Hartono; Irawati Azhar
Peronema Forestry Science Journal Vol 4, No 3 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Gambir (Uncaria gambir Roxb) is a kind of dried sap which is produced from leaves and twig of plant extract. Gambir is used traditionally for various purposes such as mixture of betel nut, drugs, adhesives and textile industry. One of central production of gambir in Indonesia is Pakpak Bharat District, North Sumatera Province. The purpose of this research were to getting information about technique of gambir processing in Sub-district of Pergetteng Getteng Sengkut and to comparing the quality of gambir with SNI 01-3391-2000. The method of this research was descriptive method using interview of respondent, then direct observation in field of gambir processing. The research showed that the technique of gambir processing generally was simple and used the traditional tools. The steps of gambir processing were boiling and compressing leaves, then the sap was got from compressed the leaves. After that, the sap was sedimented, drained to a paste form, and dried. The result of these research showed that the yield was 5.80% with the range from 5.26-6.04%. The moisture content of gambir from Simapera village was 15.38% and fulfilled the quality II, whereas the other villages in Sub-district Pergetteng Getteng Sengkut did not fulfill the quality requirements. Ash content and water-insoluble materials content were fulfilled the quality I and quality II.Keywords : Gambir, processing techniques, yield, moisture content, ash content, water-insoluble materials content
STUDI PENGGUNAAN LAHAN (LAND USE) DI KECAMATAN SINGKOHOR KABUPATEN ACEH SINGKIL TAHUN 2015 Chandra Pangihutan Simamora; Afifuddin Dalimunthe; Budi Utomo
Peronema Forestry Science Journal Vol 4, No 3 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

his study aimed to analyze the function of land uses contained in Singkohor Sub District 2015. This research was located in Singkohor Sub District,of Aceh Singkil Regency by using satellite images of landsat 8. The research method was a supervised classification. Analysis of the data for the image interpretation by using monogram of Sumatera and ground check.   The results showed that land cover in the District Singkohor include forests, plantations, open land, settlements, water bodies, bush, and farm. The largest land use at the location of the research is the type of open land area of 5491.57 Ha and forest area of 4046.67 Ha was expected to be on the wane due to the conversion of land use into other uses such as plantations. In addition, 14 species of plants obtained MPTS (Multi Purpose Tree Species) among the sites that have the advantage among others, have been tested and able to adapt to the environment so that these types of MPTS plants are more prospective in rehabilitation activities.Key Word: Land use, interpretation, Landsat imagery, plant of MPTS
Keberadaan Fungi Pelarut Fosfat pada Tanah Bekas Erupsi Gunung Sinabung di Kabupaten Karo Suryanti Saragih; Deni Elfiati; Delvian Delvian
Peronema Forestry Science Journal Vol 4, No 3 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Merapi eruption produced clouds of volcanic material and heat. Volcanic material will close the land with a certain thickness. This will affect the physical, chemical and biological soil. This research was conducted to determine the presence of Phosphates Solubilizing Fungi in the soil of former eruption in Karo regency. The soil samples were taken in areas affected by the eruption at a depth of 0-5 cm and a depth of 5-20 cm, while in areas not affected by the eruption was taken at a depth of 0-20 cm. The results showed the similarities of fungi genus and the differences of fungi phosphate solvent affected by the eruption or land that is not affected by the eruption. There are 2 genus of fungi that are found in all depth of soil, there are Aspergillus and Penicillium. The number of fungi isolates obtained 10 isolates there are 7 isolates of Aspergillus and Penicillium are 3 isolates.Keywords : The eruption of Mount Sinabung, Phosphates Solubilizing Fungi, Phosphates
Dampak Erupsi Gunung Sinabung Terhadap Sifat Kimia Tanah Di Kabupaten Karo Ceriati Magdalena Simanjuntak; Deni Elfiati; Delvian Delvian
Peronema Forestry Science Journal Vol 4, No 4 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

This study aims to determine the impact of the eruption of Mount Sinabung on soil chemical properties in Karo. This study is exploratory in which the comparison between forest land that is not affected by the eruption (control) was taken from the village Kutagugung and forest land affected by the eruption taken from the village Sukanalu. Soil samples exposed to the eruption consisted of two samples that volcanic ash with a depth of 0-5 cm and mixed with volcanic ash soil to a depth of 5- 20 cm, while for the control of soil samples consisted of a sample of the soil to a depth of 0-20 cm. Tests conducted on soil chemical properties BPTP North Sumatra and Central Laboratory of the Faculty of Agriculture, University of North Sumatra. Results showed the soil to a depth of 5-20 cm eruption contains C-Organic, CEC, available P, total P, and S with the criteria of moderate to very high, while the volcanic ash with a depth of 0-5 cm and control soil with a depth of 0 -20 cm contains the C-Organic, CEC, N, available P, total P, K, Ca, Mg and S with the criteria of very low to very high.Keyword: volcanic eruption, Sinabung, soil chemistry, soil depth.
Aktivitas Mikroorganisme Pada Tanah Bekas Erupsi Gunung Sinabung Di Kabupaten Karo Puput Sarah; Deni Elfiati; Delvian Delvian
Peronema Forestry Science Journal Vol 4, No 4 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Volcanic ash released when the eruption has an acidic pH, thus affecting the amount and activity of microorganisms in the soil. Therefore conducted this study to determine the activity of soil microorganisms in the former eruption of Mount Sinabung in Karo. Measurement of total soil microorganisms was done by Agar Cawan method, while the measurement of the activity of soil microorganisms was conducted jar and titrimetic method. The result of the research showed that the higher of the pH, the colony of microorganism will be much and the reverse. The higher of C- organic, the activity of micoorganism will be high within the soil, and the reverse. Respiration value on land affected by volcanic ash at a depth of 0-5 cm was 0,96. Respiration value on land affected by volcanic ash at a depth of 5-20 cm was 1,16. Respiration value on land that was not affected by volcanic ash was 1,52.Keywords: Volcanic ash, soil microorganisms, microorganism activity, soil depth.

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