cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota mataram,
Nusa tenggara barat
INDONESIA
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Published by Universitas Mataram
ISSN : 23018119     EISSN : 24431354     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Terhitung sejak tahun 2014, Program Studi Teknik Pertanian Fakultas Teknolgi Pangan dan Agroindustri Universitas Mataram telah menerbitkan secara online Jurnal Ilmiah Rekayasa Pertanian dan Biosistem (JRPB) sehingga dapat diakses secara luas. Jurnal ini pada umumnya memuat hasil-hasil penelitian dari mahasiswa, peneliti, akademisi, praktisi, dan pemerhati di bidang teknik pertanian dan biosistem. JRPB berupaya menjaga eksistensi penerbitannya dan berharap jurnal ini dapat menjadi salah satu media publikasi bagi semua pihak yang meminati kajian-kajian ilmiah dalam bidang ilmu Teknologi Pertanian.
Arjuna Subject : -
Articles 218 Documents
 15   16   17   18   19 
Analisis Mutu Madu setelah Proses Pasteurisasi dan Pendinginan Cepat Sasongko Aji Wibowo; Anang Lastriyanto; Vincentia Veni Vera; Bambang Susilo; Sumardi Hadi Sumarlan; La Choviya Hawa; Elok Zubaidah
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 10 No 2 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (527.761 KB) | DOI: 10.29303/jrpb.v10i2.407

Abstract

Madu berguna untuk proses metabolisme tubuh pada manusia namun memiliki sifat higrokopis sehingga perlu penanganan pascapanen. Kualitas madu dipengaruhi oleh kadar air. Kadar air yang tinggi menyebabkan madu mudah berfermentasi dengan khamir. Proses pengolahan pascapanen madu yaitu pasteurisasi dan evaporasi. Pada proses pasteurisasi dan evaporasi suhu yang digunakan tidak boleh melebihi 70ºC karena akan merusak kualitas madu. Penggunaan ohmic heating untuk pasteurisasi dan vacuum cooling untuk proses evaporasi dan pendinginan menggunakan suhu di bawah 70ºC. Tujuan penelitian ini adalah menganalisis perubahan enzim diastase, kadar air, total padatan terlarut, dan viskositas madu karet setelah proses pasteurisasi menggunakan ohmic heating dan setelah pendinginan cepat menggunakan vacuum cooling. Hasil penelitian menunjukkan bahwa hasil pengukuran enzim diastase raw memiliki nilai DN  yaitu 12,06 ± 0,146,  setelah dipasteurisasi yaitu 8,79 ± 0,132 dan setelah pendinginan yaitu 7,98 ± 0,327. Hasil pengukuran kadar air raw sebesar 17,1 ± 0,153%, setelah pasteurisasi  sebesar 16,4 ± 0,306% dan setelah pendinginan menjadi 14,1 ± 0,153%. Hasil pengukuran total padatan terlarut pada madu raw sebesar 62,7 ± 0,577 ºBrix, setelah dipasteurisasi sebesar 64,3 ± 0,577 ºBrix, dan setelah pendinginan menjadi 65± 0,000 ºBrix. Hasil pengukuran viskositas raw sebesar 5,681 ± 0,002 poise, kemudian setelah di pasteurisasi sebesar 5,921± 0,013 poise, dan setelah pendinginan yaitu menjadi 9,506 ± 0,000 poise. Penelitian ini menghasilkan madu dengan kadar air dan enzim diastase yang memenuhi baku mutu, viskositas mendekati baku mutu, walaupun total padatan terlarut belum memenuhi baku mutu.
OPTIMASI JALUR DISTRIBUSI SAYURAN DAUN SEGAR MENGGUNAKAN METODE SAVING MATRIKS (STUDI KASUS: KEBOEN BAPAK) Dede Supriatna; Drupadi Ciptaningtyas; Suhono Supangkat
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 10 No 2 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (647.918 KB) | DOI: 10.29303/jrpb.v10i2.419

Abstract

Perkembangan teknologi dan peningkatan permintaan sayuran daun segar dengan kualitas tinggi membuat perusahaan berlomba-lomba untuk meningkatkan daya saing terutama kualitas produknya. Salah satu faktor yang harus diperhatikan dalam meningkatkan daya saing dan mempertahankan kualitas sayuran daun segar adalah faktor distribusi. Pendistribusian produk kepada konsumen harus dilakukan secara efektif dan tepat waktu. Hingga kini, penentuan rute pendistribusian produk Keboen Bapak kepada konsumen masih ditentukan secara subyektif berdasarkan pengalaman courier, sehingga dapat menyebabkan proses distribusi yang kurang efisien. Masalah ini dapat dikategorikan sebagai permasalahan vehicle routing problem (VRP). Metode yang dapat digunakan untuk menyelesaikan masalah VRP adalah metode saving matrix, sedangkan metode yang dapat digunakan untuk menentukan urutan konsumen yang akan dikunjungi adalah metode nearest insert dan nearest neighbor. Penelitian ini bertujuan untuk mengetahui rute distribusi optimum produk Keboen Bapak kepada konsumen yang menjadi pelanggan tetap Keboen Bapak dengan menggunakan metode saving matrix, nearest insert dan nearest neighbor dalam 3 kasus berbeda. Hasil penelitian menunjukkan optimasi rute distribusi dengan menggunakan metode nearest insert dan nearest neighbor menunjukkan hasil yang sama. Pada kasus A, rute paling optimum adalah gudang – Borma Kiaracondong – Borma Riung Bandung – Borma Cipadung – Borma Cinunuk – gudang (rute IA) dengan jarak tempuh sebesar 43,4 km, dan gudang – Borma Setiabudi – Borma Dakota – gudang (rute IIA) dengan jarak tempuh sebesar 21,3 km. Rute optimum pada kasus B adalah gudang – Borma Cikutra – Prama Babakan Sari – Borma Cijerah – Borma Gempol – Borma Kerkof – Prama Banjaran – gudang (rute IB) dengan jarak tempuh sebesar 74,7 km, dan gudang – Borma Cikutra – gudang (rute IIB) dengan jarak tempuh sebesar 4 km. Sedangkan pada kasus C rute optimum adalah gudang – Prama Babakan Sari – Borma Cipadung – Borma Cinunuk – Borma Gempol – Borma Kerkof – gudang (rute IC) dengan jarak tempuh sebesar 68,4 km, dan gudang – Borma Dago – gudang (rute IIC) dengan jarak 6,4 km. Diharapkan hasil penelitian ini dapat dijadikan bahan pertimbangan oleh Keboen Bapak dalam penentuan rute distribusi, sehingga proses distribusi dapat terlaksana dengan optimal.
Rancang Bangun Sistem Pemantau Volume dan Keasaman Nira Kelapa dalam Penampung di Pohon Secara Realtime Andreas Wahyu Krisdiarto; Gani Supriyanto
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 10 No 2 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (546.281 KB) | DOI: 10.29303/jrpb.v10i2.420

Abstract

Gula kelapa merupakan produk yang memberi nilai ekonomi masyarakat cukup besar dalam membantu keluarga petani menambah pendapatan. Meskipun nilai tambahnya tidak terlalu besar, tetapi rantai produksinya melibatkan banyak keluarga (padat karya). Hasil produksi gula kelapa, termasuk mutunya, sering kurang optimal karena kurangnya edukasi dan masih dilakukan secara tradisional. Mutu gula kelapa diawali dari mutu nira kelapa yang disadap. Proses penyadapan sangat mempengaruhi mutu dan jumlah nira. Saat ini banyak penyadap hanya menggunakan wadah (penampung) seadanya, sehingga nira menjadi kotor karena terkontaminasi bahan lain. Selain itu, masuknya air hujan dalam wadah mengakibatkan kadar gula turun. Sistem pemantau penambahan nira dan perubahan karakter selama dalam tampungan diperlukan untuk mengoptimalkan volume dan mutu hasil sadapan. Penelitian ini melakukan perancangan sistem pemantau volume dan keasaman nira selama proses penyadapan, sehingga dapat digunakan untuk menganalisa perubahan mutu dan tingkat penyadapan dari waktu ke waktu. Metode yang digunakan adalah: (1) mempelajari fungsi dan proses penampungan nira di pohon yang digunakan saat ini, (2) merancang dan memasang sistem pantau volume dan pH dalam penampung dengan mikrokontroler, yang dapat mengirim data ke gawai (HP), (3) menguji hasil rancangan, baik fungsional maupun luaran. Pengujian menunjukkan hasil rancangan bekerja dengan baik, dapat mengukur volume dan pH nira dalam penampung dari waktu ke waktu selama penyadapan. Tingkat ketepatan pembacaan volume sebesar 93%, sedangkan pH sebesar 99%. Perangkat hasil rancangan ini dapat diterapkan pada proses penyadapan nira kelapa sehingga volume dan keasaman nira dalam penampung nira di atas pohon dapat dipantau dari gawai dimana pun secara waktu nyata.
Analisis Pindah Panas Konduksi dan Konveksi pada Heat Exchanger Evaporator Efek Ganda pada Pengolahan Nira Tebu Khoirul Anam As Syukri; Dony Perdana; Moch. Izza Maulana Sulthon; Sumardi Hadi Sumarlan
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v11i2.221

Abstract

Heat transfer occurs due to differences in temperature contained in an object. In this study only discussed about heat transfer by conduction, and by convection (inside and outside the tube). The purpose of this study was to determine the value of conduction and convection heat transfer in the heat exchanger of the sugarcane juice evaporation process using a dual effect evaporator and its effect on the rate of evaporation. The method used through observation and experimentation on the heat exchanger contained in the second tube evaporator. The materials used were 50 liters of sugar cane juice in the 1 effect tube and 26 liters of the effect tube 2. Experiments and data collection in the form of temperature, pressure, and volume were carried out 3 times. Each repeat process was carried out at 5.2 hours under vacuum. The temperature and pressure data were recorded every 10 minutes. In addition, the plate thickness, plate type, material contact surface area and characteristics of the processed material were determined. Furthermore, the data is substituted in several heat transfer equations to get the value. Based on the results of the study, the overall heat transfer coefficient value of the convection heat transfer is 35.98 w / m2K. Meanwhile, the total heat transfer from convection and conduction to the heat exchanger is 4656.6 watts. This heat transfer value can cause the evaporation rate of sugarcane juice to effect 2 of 1.03 liters / hour.
The Effect of Different Drying Methods and Slice Thickness on The Quality of Porang (Amorphophallus Muelleri) Chips Bambang Sigit Amanto; Hanun O. Chairunisa; Sigit Prabawa; Kawiji; Bara Yudhistira
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v11i2.276

Abstract

Porang (Amorphophallus muelleri) is a type of tuber that has a high glucomannan content. The purpose of this study was to determine the effect of slice thickness on the quality of porang tuber chips using the Green House Effect (GHE) method by pretreatment with 0.15% sodium metabisulfite solution immersion. The slice thickness treatment was carried out at three levels, including 4 mm, 6 mm, and 8 mm, while the drying treatment was carried out with two types, which are the GHE drying method and the conventional drying method using sunlight. The results of the research on porang chips on brightness, moisture content, glucomannan content, ash content, and calcium oxalate content showed that the thickness of the slices had an effect on the quality of the chips. The thicker the slices of the porang chips, the darker the color of the porang chips. The thicker the slices of the porang chips, the higher the water content of the chips. The amount of glucomannan (%) in porang chips goes down as the slices get bigger.
Kajian Teoritis Penentuan Sudut Kemiringan Optimal Kolektor Surya Studi Kasus: Mataram - Nusa Tenggara Barat Nanang Apriandi; Yusuf Dewantoro Herlambang; Totok Prasetyo; Margana Margana; Komang Metty Trisna Negara; Rani Raharjanti
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v11i2.416

Abstract

The performance of solar energy based apparatus in various locations is inseparable from the determination of the orientation direction and tilt angle. This study aims to determine an optimal tilt angle in Mataram city area. Photovoltaic Geographical Information System from European Commission (online) was used as the database to obtain global radiation and monthly average diffusion radiation on the horizontal surface with locus coordinates at Latitude/Longitude: -8.583°/116,107° South Latitude. That data was then processed mathematically using Microsoft Excel software. As the result, for the application of solar-based apparatus with a fixed structural configuration throughout the year, the optimal tilt angle (β) was 15° with the orientation facing north, and it was estimated that total solar radiation received throughout the year on average was 115,195 MJ/m2.
Analisis Kelayakan Finansial Kopi Bubuk Arabika dalam Kemasan Drip Bag (Studi Kasus Kelompok Tani Berdikari, Kabupaten Sumedang) Lukito Hasta Pratopo; Ahmad Thoriq; Drupadi Ciptaningtyas
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v11i2.470

Abstract

Arabica coffee powder in drip bag packaging is a new product innovation created to fulfill consumer desires and increase product sales. This study aims to analyze the financial feasibility of arabica coffee powder in drip bag packaging. Primary data was collected through direct observation and interviews while secondary data was collected from published scientific references. Financial analysis is carried out to obtain information on Production Costs (BP), Cost of Production (HPP), Net Present Value (NPV), Benefit Cost Ratio (BCR), Internal Rate of Return (IRR) and Payback Period (PBP). The results showed that natural processing of coffee beans with a production capacity of 84,143 drip bag packages per month and raw materials for green coffee beans with a moisture content of 30% - 40% resulted in a production cost of IDR 143,603,885.74 per month and HPP of IDR 1 .706.67 per drip bag. At a product selling price of IDR 2,500.00 per drip bag packaging, an NPV value of IDR 4,118,480,686 was obtained, a BCR of 1.44, an IRR of 36.00% and PBP occurred in the 3rd month.
Pemanasan Ohmik Roti Bebas Gluten Berbasis Tepung Kedelai Hitam-Beras: Kajian Suhu Dan Daya Jenri Parlinggoman Hutasoit; Aji Sutrisno; Aniswatul Khamidah
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v11i2.504

Abstract

Ohmic heating is a heating process that works based on passing electric current through resistive materials. This heating is known to have advantages such as producing uniform heat and a high heating rate. The purpose of this study was to determine the changes in temperature and power used in ohmic heating of gluten-free bread based on black soybean flour substituted with rice flour. The bread batter formulation in this research was based on black soybean flour with rice flour substitution (50, 40, 30, 20, 10 and 0%).  The parameters of temperature and electrical power were obtained from the data logger. The data is calculated in formulas and displayed in curves as a function of time during the process. The results showed that the addition of rice flour or the higher the ratio of rice flour in the dough showed a rapid rate of temperature increase at its maximum value, as well as the initial electrical power value used during heating. Based on the calculation of the time needed to reach the optimal temperature of about 97 oC in each treatment, it was found that the treatment of 50% black soy flour + 50% rice flour (8 minutes 10 seconds), the treatment of 60% black soy flour + 40% rice flour (8 minutes 30 seconds), the treatment of 70% black soy flour + 30% rice flour (8 minutes 60 seconds), the treatment of 80% black soy flour + 20% rice flour (9 minutes 40 seconds), the treatment of 90% black soy flour + 10% rice flour (11 minutes 30 seconds), and the treatment of 100% black soy flour + 0% rice flour (12 minutes).
Nilai Erosi dengan Metode Rusle dari Pemanfaatan Citra Sentinel-2 di Wilayah Sungai Pasee Peusangan Firman Hadi; Tito Eka Syafjanuar; Nasrul Arrahman; Ichwana Ramli
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v11i2.523

Abstract

Erosion of watercourses is a natural process related to the environment which has an adverse impact on the environment, through the organic, physical and chemical properties of the soil. This causes a decrease in soil productivity, pollutes rivers and fills water reservoirs. Erosion estimates were calculated using the Revised Universal Soil Loss Equation (RUSLE) with GIS to achieve the research objective. Calculations with the RUSLE method are carried out with the assumption that soil erosion occurs by 5 main factors, namely rain erosion (R), soil physical properties (K), land use status (C), erosion control area (P) and topography (LS). The RUSLE equation can also be used to calculate sediment. This study uses remote sensing imagery from Sentinel-2 MSI. In this research, to improve the geolocation accuracy of geometric correction and atmospheric correction using the Sentinel Application Platform, namely SNAP (Sentinel Application Platform). The results showed that most of the Pasee-Peusangan area was indicated as an area with low erosion, most of this area was in the north. While for the location to the south, there are different values indicating erosion, where the value is getting higher. Area Indications of moderate and high erosion in the Pasee-Peusangan is to the south, where this area has a mountainous topography with alluvial soil types, so the potential for erosion in this area is high. The highest erosion areas are scattered which are dominated in the several areas of the Peusangan highlands. Meanwhile for the Pasee, the highest erosion occurred in the transition and downstream (coastal) areas. Land management needs to be considered to be able to determine the causes of these differences.
Pede Tanam 1.0, Sistem Informasi Debit Air Realtime Berbasis Internet of Things (IoT) Bayu Dwi Apri Nugroho; Benyamin Nahak; Hertiyana Nur Annisa
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v11i2.527

Abstract

In an effort towards the industrial revolution 4.0, in modern irrigation management, conventional methods must be accompanied by technology. Then also the delivery of water discharge data to the Provincial Irrigation Commission secretariat is slow and not up to date, the Global Planting Plan (RTTG) and Detailed Planting Plan (RTTD) do not exist, an innovative Real-time Debit Logger (Pede Tanam 1.0) is needed. The way this tool works is through two sensors that are mounted on a cross section both in the primary irrigation canal and the data is processed by the microcontroller system to be sent via an internet connection quickly and accurately and the results are displayed in an application installed on a PC or mobile phone in the form of numerical data and graphics, as well area information can be streamed. Furthermore, information on the condition of the water debit can be printed automatically on the O-6 blank. The latest data transmission from sensors can be set every five minutes of updating. This new concept has been tested in the Manikin Irrigation Area, Kupang Regency, East Nusa Tenggara Province. The results of this study, that the water discharge meter in real time is running well, including updating data and also printing O-6 blanks directly from the Pede Tanam information system and from applications on smart phones. This will be very useful in the future, especially if implemented in areas that have islands, apart from efficiency problems, social conflicts can also be avoided.

Page 17 of 22 | Total Record : 218

 15   16   17   18   19 

Filter by Year

2015 2025


Reset
Filter By Issues
All Issue Vol 13 No 2 (2025): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 13 No 1 (2025): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 12 No 2 (2024): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 12 No 1 (2024): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 2 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 11 No 1 (2023): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 10 No 2 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 10 No 1 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 9 No 2 (2021): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 9 No 1 (2021): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 8 No 2 (2020): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 8 No 1 (2020): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 7 No 2 (2019): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 7 No 1 (2019): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 6 No 2 (2018): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 6 No 1 (2018): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 5 No 2 (2017): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 5 No 1 (2017): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 4 No 2 (2016): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 4 No 1 (2016): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 3 No 2 (2015): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 3 No 1 (2015): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem More Issue