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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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Model and Simulation Deef-Bed Clove Drying : Effect of Fermented Treatment Agus Supriatna Somantri
Jurnal Keteknikan Pertanian Vol. 15 No. 1 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.1.%p

Abstract

This paper describes the prediction of deep-bed clove drying. This model also considers mass and heat profile that was affected by fermentation process. This model used the equation of two-dimensional finite difference approximation. The dynamic of two-dimensional equation were solved numerically by alternating direction Crank-Nicolson method and then applied to simulate the changes of moisture content and temperature of cloves during drying process. The capabilities of these models were compared with experimental data obtained from the research under variable conditions such as temperature and relative humidity on fermentation and non-fermentation treatment of cloves. The result of simulation showed that the equilibrium of moisture content (EMC) wasconsiderably decreased whereas the rate of drying was dramatically increased with the increase of the temperature of drying. The profile of moisture content on deep-bed cloves drying was unique. The fermented and non-fermented treatments of the cloves did not give significant differences on the drying time in order to achieve the equilibrium of moisture content.
Applicatin of Some Evapotranspiration Models at Tropical Region Slamet Suprayogi; Budi Indra Setiawan; Lilik Budi Prasetyo
Jurnal Keteknikan Pertanian Vol. 17 No. 2 (2003): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.017.2.%p

Abstract

Potential evaporation (ETp) can be calculated by ETp models climatological parametrs. Among them, the Penman model is most frequently used for ETp estimation. The penman model requires five climatic parameters : temperature, relative humidity, wind, saturation vapor pressure, and net radiation. It also uses complicated unit conversions and lengthy calculation. There are a simple models such as : Jensen - Haise models, Hargreaves, Radiation, Turc's, and Makkink's model. These models that requires only two climatic parameters, temperature and incident radiation.
Simulation of Temperature Control in Growth Room for Tropical Mushroom Budi I. Setiawan; Diduk A. Wijaya; Leopold O. Netwan
Jurnal Keteknikan Pertanian Vol. 15 No. 1 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.1.%p

Abstract

Optimum growth of tropical mushrooms depend on the ambient environment. In general, mushrooms prefer low air temperature and high air humidity. The growers use closed rooms to maintain favorable conditions. Recently, use of refrigerator is of interest to maintain the favourable conditions under hot and humid climate conditions. This study is attempting to apply control mechanism in maintaining theambient temperature favorable for mushroom growth. A simple heat transfer equation was used to describe changes of temperature inside the growth chamber. This equation was then coupled with a fuzzy logic control to actuate a refrigerator at a suitable length of time. Three temperature condition (16, 19 and 21 O C ) were set as set points. The results show the developed technique was capable to maintain the temperature inside the growth room even though under the influence of a highly fluctuating ambient temperature. This technique was alsoresponsive and reliable in facing immediate disturbances, and showed a realistic requirement of cooling energy.
Modifying Tank Model for Study on the Land Use Change Effect to Runoff . Harmalis; M. Azron Dhalhar; M. Yanuar J. Purwanto
Jurnal Keteknikan Pertanian Vol. 15 No. 1 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.1.%p

Abstract

The objectives of the research were to modiv the tank model by using infiltration process in the model, based on available daily rainfall data, actual evapotranspiration rates, in 1996 and 1997 for the Cidanau Watershed. The hydrological data were the primary and secondary data. In this study, the prediction of the daily river runoff / discharge was developed by using the modified tank model of the rainfall-runoff processes, and applied to simulate the three land use types in the Cidanau Watershed, comprising of 22 620 Ha. The average coefficient of correlation is 0.81 for the model calibration and validation. The model can also be used to predict river discharge for different land use.
Development and Management of Water in Wetland Soedodo Hardjoamidjojo; Budi I. Setiawan
Jurnal Keteknikan Pertanian Vol. 15 No. 1 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.1.%p

Abstract

This paper describes potentials as well as obstacles in developing wetland for agricultures. Historical backgrounds of wetland utilization for agricultures Indonesia and wetland definition by Ramsar Convention are highlighted. Special emphasis is given to explain physical and hydrological conditions of wetland and opportirnities to develop sustainable agricultural activities based on wetland categories. Current problems in developing wetland, sucsh as land degradation and lost of wetland are enlightened, and a little note is aroused to elucidate the failure of One Million Hectares Project in Central Kalimantan. Finally, prospectivetechnologies for controlling water table were proposed.
Effect of Impact and Fruit Harvesting Indexes on the Quality of Mangosteen Fruit I.B.P Gunadnya; I.M. Supartha Utama; M. Sudiana Mahendra
Jurnal Keteknikan Pertanian Vol. 15 No. 1 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.1.%p

Abstract

Mangosteen fruit is one of tropical exotic fruits that has potency as exported commodity but its potency is limited by its poor quality. Both the fruit shell and its aril are very susceptible to any improver handling during and after harvesting andsince then its quality decreases rapidly. Experiments were set up to study the effect of impact, by dropping the fruit from certain heights, and fruit harvesting indexes on its quality. Visual observations showed that dropping the fruit from 0.5 m above the floor was sufficient to damage fruit shell and aril. The inner surface of fruit shell that subjected to the impact became brown and the aril became translucent and tasteless. Quantitatively, fruit shell became hard after two-day- storage and the dropping of the fruit and fruit harvesting indexes significantly affected total soluble solid of the aril. The fruit with harvesting index 5 significantly contained the less total soluble solid when it was dropped from the height of 1 m and stored for 6 days.
Desorption Equilibrium Moisture Content Isotherm of Corn Lamhot P. Manalu
Jurnal Keteknikan Pertanian Vol. 15 No. 1 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.1.%p

Abstract

The concept of equilibrium moisture content or EMC is important in study of storage. The EMC of cereal grain is defined as the moisture content' of the material after it has been exposed to a particular environment for an infinitely longperiod of time. The EMC is dependent upon the humidity and temperature conditions of the environment.The more important limitation in process design for agricultural products is the lack of exprimental data can be found. The variety of products and the differences in measurement method make limitation on the valueof the available data, especially for Indonesian's products. The data are needed to get information about moisture content change when product was processed like storage or drying.The objective of this research is to determine the EMC equation models of local corn with the static method. The result indicates that Chung-Pfost and polynomial models are better reprentative to predict the EMC than Henderson's.
Analisis Biaya Sistem Tebang-Angkut pada Pemanenan Tebu Bakar di PT. Gula Putih Mataram, Lampung Utara Agus Haryanto; Sugeng Triyono; Eka Oktaviani
Jurnal Keteknikan Pertanian Vol. 15 No. 2 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.2.%p

Abstract

The objective of this research was to calculate the cost of harvesting and transportation methods for sugar cane. The research was conducted at the PT. Gula Putih Mataram by observe the total cost of four methods of harvesting and transportation of sugar cane in the last harvesting season. These types were Bundle Cane (BC), Loose Cane with truck (LC-Truck), Loose Cane with Ford tractor (LC-Ford), and Loose Cane with John Deere tractor (LC-JD). The results showed that the total cost of harvesting and transportation per ton of sugar cane was Rp. 19,040.00 for the first method, Rp. 12,078.32 for the second one, and Rp. 27,631.12 for the third one and Rp. 36,500.86 for the last one. These results indicate that the Loose Cane with truck is the cheapest method for harvesting and transportation in PT. Gula Putih Mataram.
Drying Simulation of Rough-Rice in a Horizontal-Semi Cylindrical Plenum (Drying-Bed) Atjeng M. Syarief
Jurnal Keteknikan Pertanian Vol. 15 No. 2 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.2.%p

Abstract

Simulation technique was used to determine the drying charaden'stic of roughrice in a horizontal-semi cylindrical plenum (drying-bed). The mathematical model simulation used in study was a set of partial d&rential equation. In order to ve*the validity of the simulation technique, the experimental tests were tun to provide data to he compared with the simulation results. The experimentation was conducted using rough-rice samples at two levels of drying temperatures, 50% and45%. The results indicate that the mathematical model predicts the charactetkiics of the actual rough-rice dtying very closely that the differences are staWicaUy no significant, although there are little bit (=95%) differem between the simulatitmtechnique and the test run results. These are true not only for the drying air temperature data but also for the moisture content data as well.
Soil-Metal Adhesion Due To the Variation of Soil Compactness and The Soil Moisture Content Gatot Pramuhadi; Eduard Namaken Sembiring
Jurnal Keteknikan Pertanian Vol. 15 No. 2 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.2.%p

Abstract

Soil, as the nature body, is very important in supporting the live perpetuity of the living creatures. In farm machinery and equipment application for soil tilling, soil also affects the goal of the soil tillage activities. When the soil tillage equipment and machinery are to be applied in the field. there will Qe interaction among the traction device, the blade, and the soil. The soil, which is used as a machine supporter, must have a certain consistency.Consistency is the degree of cohesion and adhesion among soil partides and soil mass resistance to the variation of shape by pressure and strength, that affected the soil deformation.

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