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INDONESIA
Jurnal Keteknikan Pertanian
Published by Institut Pertanian Bogor
ISSN : 24070475     EISSN : 23388439     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Jurnal Keteknikan Pertanian dengan No. ISSN 2338-8439, pada awalnya bernama Buletin Keteknikan Pertanian, merupakan publikasi resmi Perhimpunan Teknik Pertanian Indonesia (PERTETA) bekerjasama dengan Departemen Teknik Mesin dan Biosistem (TMB) IPB yang terbit pertama kali pada tahun 1984, berkiprah dalam pengembangan ilmu keteknikan untuk pertanian tropika dan lingkungan hayati. Jurnal ini diterbitkan dua kali setahun. Penulis makalah tidak dibatasi pada anggota PERTETA tetapi terbuka bagi masyarakat umum. Lingkup makalah, antara lain: teknik sumberdaya lahan dan air, alat dan mesin budidaya, lingkungan dan bangunan, energi alternatif dan elektrifikasi, ergonomika dan elektronika, teknik pengolahan pangan dan hasil pertanian, manajemen dan sistem informasi. Makalah dikelompokkan dalam invited paper yang menyajikan isu aktual nasional dan internasional, review perkembangan penelitian, atau penerpan ilmu dan teknologi, technical paper hasil penelitian, penerapan, atau diseminasi, serta research methodology berkaitan pengembangan modul, metode, prosedur, program aplikasi, dan lain sebagainya.
Arjuna Subject : -
Articles 623 Documents
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Pemodelan Dan Simulasi Pengeringan Jagung Pipilan Dalam Pengering Rotari Tumpukan Leopold Oscar Nelwan; I Nengah Suastawa; Sulikah .
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

A mathematical model of shelled corn drying has been developed in order to simulate the distribution of drying air temperature and humidity as well as the grain moisture content in a rotary bed dryer. The model was based on heat and mass balance of cylindrical packed bed of grain with airflow passing through the bed. Whenever the air relative humidity is higher than the equilibrium moisture content, it is assumed the condensation process will be occurred. Finite difference method with Euler scheme was used to perform the computation. The result showed that the model developed can predict the distribution ofgrain temperature and moisture content. The simulation conducted showed that there would be a wide variation ofmoisture content and temperature if mixing was not applied during the drying process. Mixing was significantly reduced the moisture content variation until a maximum of 0.8% w.b.Keywords: rotary bed drying, mathematical model, simulation, corn dryingDiterima: 5 Februari 2008; Disetujui: 26 Juni 2008
Getaran Akibat Gangguan Secara Alami Soeharsono .; Radite Praeko Agus Setiawan
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

This paper discusses the phenomenon of self-excited vibration in some physical model including its applications in some different engineering field. The referred physical model include the impact damper and its application for damping the vibration of shear building, chatter phenomenon on machine tools, ride comfort on agricultural machinery and stick-slip phenomenon and its benefit on vibration subsoiler. It is intended that this paper could provide a global overview on phenomenon-of self-excited vibration. Keywords: self-excited, vibration, stick-slip, subsoile Diterima: 03 Januari 2008; Disetujui: 12 Mei 2008
Disain dan Uji Kinerja Pengering Rotari Tumpukan untuk Pengeringan Jagung Pipilan Sulikah .; Leopold Oscar Nelwan; I Nengah Suastawa
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

A rotary bed dryer for grain had been developed and tested in this study. The dryer was designed in order to provide an effective mixing effect. The dryer used perforated cylindrical drum for its chamber and was rotated by an electrical motor. The result showed that when the numbers of rotation was 20, the shelled corn had been mixed effectively. To meet this condition, the drum was rotated for 5 minutes every 15 minutes during the drying process. As the result, the variation of moisture Qontent in radial direction was less than 1.1% w.b. With drying air temperature of 670C and 600C the specific energy consumption of the dryer were 5.6 MJ/kg to reduce the moisture content from 25 to 16% b.b. and 5.4 MJ/kg from 17 to 13% w.b. Thermal energy was the highest contributor of total energy consumption. As it had been expected, the full load of the dryer provided a lower mechanical energy requirement than the half load. Keywords: rotary bed dryer, mixing, specific energy consumption Diterima: 5 Februari 2008; Disetujui: 10 Juni 2008
Pengaruh Pemanasan Kelapa Parut Dan Teknik Pengunduhan Terhadap Rendemen Dan Mutu Virgin Coconut Oil (VCO) Sutardi .; Umar Santoso; Anggia .
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

Virgin Coconut Oil (VCO) was produced from green variety ofnon-hybride coconut type. Grated coconut was heated at 500, 70°, and 90°C for 20, 30 and 40 minutes, respectively. Harvesting technique of VCO were done by conventional, utilization of stainless steel screen, and filter paper laminated stainless steel screen methods, respectively. Produced VCO was subsequently analyzed their productivity and quality parameters consisting of moisture content, acid number, free fatty acid (FFA), peroxide number, iodine number, saponification number, clearness and fatty acid profile of VCO. Statistical analysis was also conducted by using Analysis of Variance and Duncan Multiple Range Test with 5% significancy.The results showed that heating ofgrated coconut at 900C for 40 minutes produced 29.65 ±0.38% VCO, and it was the highest productivity.-Heating temperature ofgrated coconut and with any harvesting technique didn't statistitically have significant effect on productivity and quality of VCO. While, combination of heating temperature at 90°C and it was followed by harvesting technique using stainless steel screen produced the highest VCO i.e. 31.54 ± 0.58%. The best quality of VCO was characterized by 0.09 ± 0.01% moisture content, 0.20 ± 0.02 mg KOH/g oil of acid number, 0.12 ± 0.01% free fatty acid (FFA), 0.37 ± 0.01 meq/kg oil ofperoxide number, 5. 11 ± 0.01 g iod/100 g oil ofiodine number, 244. 12 ± 0.01 mg KOH/g oil saponification number and the VCO was clear and transparant. Fatty acid profile of selected VCO was dominated by medium chain fatty acid (C12:0) particularly lauric acid i.e. 50.26% and followed by 8.65% caprylic and 5,73% capric acids, respectively. "The quality parameters of VCO was able to meet the quality standard of VCO that was issued by APCC (Asia Pacific Coconut Community) quality grade.Keywords: Grated coconut, heating, harvesting technique and VCO.Diterima: 19 Apri 2008; Disetujui:27 Juli 2008
Penentuan Parameter Optimal Kendali Greenhouse Berbasis Fazi Dan Pid Menggunakan Algoritma Genetika Tamrin .
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

The development of the control system of adaptive biological-environment was equipped with the optimization technique of'Genetic Algorithm in solving the problem of optimizing parameters. Optimizing the determination ofparameters of fuzzy control and PID were carried out by stimulating the real noise from solar irradiation in greenhouse, such as fluctuation of solar radiation in day time. The parameters of optimal control were determined by minimizing the cumulative square error for each physical unit, such as temperature and humidity with the fitness function which was reciprocally arranged. The performance ofcontrol system was better with the availability ofgenetic algorithm, and therefore the mode of fuzzy control and PID could be used to control the whole biological-environment. The fuzzy parameters for temperatures were P1=O. 17, P2=O.32, P3=11.28, P4=4.58, and P5=141.89, for humidity P1=O.38, P2=O.05, P3 =6.96, P4 =11.73, and P5=968.65; whereas the PID parameter for temperature were Kp=O.06, TD=O.08, and TD=1.91, for humidity were Kp=O.01, TD=O.0012, and TD=16.Keywords: optimal parameter, fuzzy control, PIO control, genetic algorithmDiterima: 21 Januari 2008; Disetujui: 27 Mei 2008  
Pendugaan Kerusakan Mangga Arumanis Akibat Lalat Buah Menggunakan Atenuasi Ultrasonik Warji .; Rokhani Hasbullah
Jurnal Keteknikan Pertanian Vol. 22 No. 2 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.2.%p

Abstract

The objectives of this research were to determine attenuation coefficient of arumanis mangoes, to develop border equation prediction and to validate the border equation prediction of arumanis mangoes damage caused by fruit fly using ultrasonic attenuation coefficient. The method was-based on measurement of attenuation coefficient ultrasonic wave in arumanis mangoes. Results showed that mean of normal arumanis mangoes attenuation coefficient was 36.45 Nplm and attenuation of arumanis mangoes damage caused by fruit fly was 30.67 NPlm. Border equation prediction was attenuation coefficient more than 34.76 for normal mango and attenuation less than or same 34.76 for mangoes invested by fruit fly. Keywords: arumanis mangoes, fruit fly, ultrasonic, attenuation coefficient.
PENGGUNAAN PERSAMAAN HIPERBOLOID UNTUK IDENTIFIKASI STRUKTUR GEOMETRI BAJAK SINGKAL Ade Moetangad Kamadibrata
Jurnal Keteknikan Pertanian Vol. 20 No. 1 (2006): Jurnal Keteknikan Pertanian
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.020.1.%p

Abstract

Abstract Various geometric structures of moldboard ploughs need to be identified since there have been confusing uses of European and Asian Ploughs in cultivating lowland fields: the European one that was constructed for tillage of upland soil prior to destruct impervious soil layers in root zones has been frequently applied in wetland paddyufields. It leads to frequently disturbances of the formation of hardpan layer structures required for an ideal wetland paddy field that should be formed within a soil depth of 20-40 cm. The research observed three types of moldboard ploughs dominantly operated in wetland paddy filds: a wood (Lanyam), a wood-iron (Brujul) and an iron/steel ploughs. Research method employed a descriptive explanatory one to identify the geometric stucture of the ploughs based on hyperboloid equation: ´2/a2 + Y2/b2-Z2/c2= 1. The plough identity was determined by ratio values amongst the constans a, b and c of the equation, i,e.; R1 = a/b R2 = a/c, and R3 = b/c, where the respective constants were caculated according to the positions of a numbers of coordinate points on the moldboards projected in the Cartesian coordinate system. Results of identification showed thaht the values of R1, R2 and R3 could indicate the identity of the ploughs where Lanyam and Brujul were categorized into the types of  Asian ploughs where Lanyam and Brujul were categorized into the types of Asian ploughs by their R1 and R2 < 1 and R3 1, so their operation on wetland paddy fields were reasonable. Whereas the iron/steel one was categorized into the type of European ploughs by R1 and R2 > 1 R3 << 1. They should not be recommended to be operated on wetland paddy fields. Keyword: Asian & European moldboard ploughs, hyperboloid equation, constant ratios of hyperboloid equation.
OSMOSIS – PUFFING SEBAGAI SUATU ALTERNATIF PROSES PENGERINGAN BUAH DAN SAYURAN Daniel Saputera
Jurnal Keteknikan Pertanian Vol. 20 No. 1 (2006): Jurnal Keteknikan Pertanian
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.020.1.%p

Abstract

Abstract A new method of drying fruits and vegetables, a combination of the osmotic drying with the CO2 puffing process, was carried out in this study. the fruits were soaked in an osmotic media, continued by puffing the product with CO2 gas and then dried using the fluidized bed dryer wich resulted in a product that resembled the volume and  shape of  a fresh product. The type of osmotic media and concentration, and the soild gain. Also the sample’s tichness had a significant effect on the water loss and solid gain. The best concentration was 50%, and the best media was sucrose. Osmotic-puffing using sugar solution had no significant effect to the ratio of bulk specific volume (BSV) between the osmotic puffing compare to without osmotic. The product treated with the solution of KCI combined with sugar had a lower BSV of puff product compared to the product soaked only with KCI. The concentration of KCI 5% gave the best BSV. The NaCI solution of  5% was also tested for osmotic-puffing dehydration of carrot which resulted in the BSV of 6.8 cm3/g. Keyword: osmotic, pufing, CO2
KELAYAKAN TEKNO-EKONOMI SISTEM IRIGASI CURAH, TETES DAN KENDI PADA BUDIDAYA TANAMAN MELON (Cucumis Melo, L.) Hasbi .
Jurnal Keteknikan Pertanian Vol. 20 No. 1 (2006): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.020.1.%p

Abstract

ABSTRACT The objective of this study was to determine the most suitable irrigation system consisted of sprinkler, drip and picther for melon crof cultivation in dry land having the same soil type, as well as to evaluate its financial feasibility at business scale.the study was conducted in two stages. The first stage was planting of melon cropof Sky Rocket variety using each of the irrigation systems. The second stage was to carry out analysis on the technical and financial feasibilities. The technical feasibility consisted of water supply analysis, evapotranspiration analysis, efficiency of land that could be utilized, whereas the financial feasibility consisted of NPV, Net B/C, BEP and sensitivy analysis. The result showed that the three irrigation systemswere technically feasible to be applied for melon crop cultivation. This was shomn by normal weekly growth of melon crop and good average production yield of the melon crop. The three irrigation systems (sprinkler, drip and pitcher) were financially feasible as they had NPV and Net B/C values that were greater than the reference values. Results of sensitivity analysis to 10% of cost increase and 10% of selling price decrease showed that the three irrigation systems above were still feasible to be applied for melon crop cultivation as their NPV and B/C values were greater than the refrence values.. Keyword : melon, technical and financial feasibility, sensitivity analysis.
STUDI KASUS PENENTUAN RENDEMEN TEBU DI PABRIK GULA BUMN Lamhot P. Manalu Istiawati
Jurnal Keteknikan Pertanian Vol. 20 No. 1 (2006): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.020.1.%p

Abstract

ABSTRACT Condition of national sugar industry are systematically decreasing. The area, production, and produvtivity of sugarcane have been decreasing within last eight years, while sugar import has been increasing fast. Apropriate strategic plans to improve the above condition are required. Determination of rendemen by sugar mill(PG) is often based on asumption and is not measured correctly and transparently, of witch it becomes a source of conflicts between farmer and PG. This matter decreases the trust of farmer to PG and consequently the farmer is reluctant to plant sugar cane for better production. To overcome comprehensively, this research analyzes mechanism and management of current determination of rendemen. This research analyzes mechanism and management of current determination of rendemen. This study proposes a mechanism to improve rendemen of sugar that might be accepted by all parties. Keyword: rendemen determination, sugar, cane, sugar mill.

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