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Jurnal Keteknikan Pertanian Tropis dan Biosistem
Published by Universitas Brawijaya
ISSN : -     EISSN : 2656243X     DOI : https://doi.org/10.21776/ub.jkptb
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Control & Systems Engineering Electrical & Electronics Engineering Energy Mechanical Engineering
Jurnal Keteknikan Pertanian Tropis dan Biosistem (JKPTB) (ISSN: 2656-243X) has published the state-of-art articles which focus on both fundamental studies and applied engineering including Power and Agricultural Machinery, Mechatronics and Agro-industrial Machinery, Food and Post-Harvest Technology and Soil and Water Engineering. By providing an update issue and current topic in agricultural technology field, JKPTB becomes the reference for many scientist and stakeholders who work on Agricultural Engineering
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 423 Documents
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The Particle Size Distribution and Colour Profiles of Porang Powder with Variation Porang Flour Mass Feeds: A Preliminary Study: Profil Distribusi Ukuran Partikel dan Warna Bubuk Porang dengan Variasi Input Massa Tepung Porang: Studi Pendahuluan Witoyo, Jatmiko Eko; Ni'maturohmah, Eva; Pamungkas, Bangkit Puji Putra; Permatasari, Nelsy Dian; Argo, Bambang Dwi; Yuwono, Sudarminto Setyo; Widjanarko, Simon Bambang
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.04

Abstract

Porang is rich in glucomannan, making it valuable in food and non-food applications, often processed into porang flour. Size reduction of porang flour into porang powder is a crucial stage to meet the particle size standard of commercial konjac powder.  However, this stage is rarely explored, especially when using a roller mill machine.  This study aims to evaluate the performance of a batch roller mill machine on the particle size and colour of porang powder with various porang flour masses. The mass of porang flour used in this study was 100, 200, and 300 g, which were coded M100, M200, and M300, respectively, and the results obtained were analyzed descriptively. The particle size distribution was assessed using a particle size analyzer CILAS 1090-dry method, and colour was observed using the Colour Reader Minolta CR-10. The results showed that different mass variations of porang flour produced different particle size distribution patterns in the porang powder produced. Mathematically, the parameters d10, d50, d90, and the average diameter of porang powder follow an exponential equation as a function of the increasing porang flour mass, with R2 values ranging from 0.97 to 0.99. In addition, the average diameter of porang powder from treatment M100 was 68.81 µm and met the average particle size of commercial konjac powder. The colour  L* and degree of whiteness (DoW) of porang powder decreased linearly as a function of the increasing porang flour mass, while the a* and b* values increased logarithmically, with R2 values more than 0.99.
Use of Arbuscular Mycorrhizal Fungi and Liquid Organic Fertilizer for Soybean Cultivation on Post-Mining Land: Penggunaan Fungi Mikoriza Arbuskula dan Pupuk Organik Cair untuk Budidaya Kedelai di Lahan Pascatambang Batubara Kusumawati, Eko; Susanto, Dwi; Nurhikmah, Putri Indah
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.06

Abstract

Arbuscular mycorrhizal fungi is one of the biological fertilizers defined as inoculants with active ingedients of living organisms that function to tether certain nutrients or facilitate the availability of nutrients in the soil for plants. Organic liquid fertilizer is a solution resulting from the decomposition of organic matter derived from plant residues, animal and human waste that contains more than one element. The addition of arbuscular mycorrhizal fungi and organic liquid fertilizer is expected to improve the plant gowth environment and increase the availability of several nutrients. The purpose of this study was to determine the effect of arbuscular mycorrhizal fungi and the effect of organic liquid fertilizer and their interaction on the gowth of soybean plants (Glycine max L.) gown on post-mining soil. This research was conducted using a 2-factor completely randomized design (CRD) with 3 replications. The treatments consisted of arbuscular mycorrhizal fungi (0, 10, 20, 30, 40g/polybag)  and organic liquid fertilizer (0ml, 10ml/plant, 20ml/plant). The results showed that arbuscular mycorrhizal fungi with a single factor and a combination of arbuscular mycorrhizal fungi with organic liquid fertilizer had a significant effect on plant gowth and colonization of soybean plant roots.
Correlation Analysis of RGB Image-Based Vegetation Indices to Chlorophyll Content in Leafy Vegetables with Nutrient-Stressed Condition: Analisis Korelasi Indeks Vegetasi Berbasis Citra RGB Terhadap Kandungan Klorofil pada Tanaman Sayuran Daun dengan Kondisi Cekaman Hara Suharto, Yohanes Bayu; Suhardiyanto, Herry; Messaline, Theressa
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.03

Abstract

Nutrient stress is one of the main factors affecting the growth and productivity of leafy vegetables. Chlorophyll content is often used to indicate plant nutrient status, but conventional measurement methods are destructive and inefficient. This study aims to analyze the correlation between various RGB camera image-based vegetation indices and chlorophyll content in hydroponically cultivated leafy vegetables under nutrient-stress treatment. The six vegetation indices used in this study are Excess Green (EXG), Visible-band Difference Vegetation Index (VDVI), RGB Vegetation Index (RGBVI), Normalized Green Blue Difference Index (NGBDI), Green-Red Vegetation Index (GRVI), and Visible Atmospherically Resistant Index (VARI). RGB image data were captured using an RGB digital web camera sensor (Xiaovv XVV-6320S) on a photo box set under controlled lighting conditions. At the same time, chlorophyll content was measured using a SPAD-502 Chlorophyll Meter. Pearson correlation analysis showed that the vegetation indices VARI (r = 0.90, R² = 0.82) and GRVI (r = 0.89, R² = 0.80) had robust correlations with chlorophyll content, making them the best indices for RGB image-based estimation of chlorophyll content in leafy vegetables. The results of this study indicate that RGB image-based vegetation indices can be an efficient, non-destructive method for detecting nutrient stress in leafy vegetables and have the potential to be applied in precision agriculture systems and automated monitoring in greenhouses.
Analisis Penentuan Prioritas Pengelolaan Sub DAS Cikamiri Menggunakan Metode AHP: Analysis of Prioritization of Cikamiri Sub Watershed Management Using AHP Method Soerya, Sarah Fitri; Hanifah, Aisyah
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.11

Abstract

Perubahan tutupan lahan di Sub DAS Cikamiri berdampak pada erosi, limpasan permukaan, longsor dan banjir. Akibat dari perubahan penggunaan lahan, Sungai Cikamiri mengalami peningkatan tinggi muka air (TMA) dengan tinggi dari 0.7 m menjadi 1.5 m sehingga mengakibatkan volume air di muara Sungai Cikamiri bertambah dan menyebabkan banjir yang membuat TPT ambruk di tahun 2023 hingga masuk ke ruas jalan. Diperlukan penelitian mengenai kebutuhan pengelolaan lahan yang tepat berdasarkan pengalaman dan keikutsertaan masyarakat pada wilayah Sub DAS Cikamiri sesuai dengan kebutuhan masyarakat dan lingkungan. Penelitian ini bertujuan untuk menentukan pengolaan tutupan lahan daerah aliran sungai menggunakan metode Analytic Hierarchy Process (AHP) untuk menyederhanakan proses penetapan prioritas untuk banyak objek dengan membandingkan beberapa objek referensi, menghindari distorsi dan masalah pembalikan peringkat. Kriteria atau faktor yang mempengaruhi penentuan prioritas pada penelitian ini adalah potensi limpasan permukaan, potensi erosi,  potensi longsor dan potensi banjir.  Sehingga menghasilkan tiga alternatif, yaitu Eksisting tanpa intervensi, rencana tata ruang wilayah dan konservasi tanah dan air. Hasil penelitian menunjukkan prioritas alternatif pengelolaan tutupan lahan Sub DAS Cikamiri konservasi tanah dan air (nilai prevalensi 56.4%) memiliki peringkat prioritas tertinggi yang berpengaruh terhadap kejadian erosi, limpasan permukaan, longsor dan banjir karena diperlukan perbaikan tutupan lahan dan pengoptimalan tutupan lahan yang memiliki potensi ekologis di Sub DAS Cikamiri sehingga bisa optimal, baik dalam sisi ekonomi atau ekologis. Prioitas kedua diikuti oleh alternatif perencanaan tata ruang wilayah pada bidang ekologis (nilai prevalensi 36.2%) yang memiliki potensi peningkatan ekologis dan ekonomi yang baik. Rekomendasi konservasi tanah dan air yang bisa dilakukan di daerah hulu adalah agroforestri, silvikultur dan terasering.
Pemanfaatan Data Penginderaan Jauh untuk Identifikasi Perubahan Zona Agroklimat di Provinsi Papua Barat: Utilization of Remote Sensing Data to Identify the Agroclimate Zone Change in West Papua Province Faisol, Arif; Paga, Bertha Ollin; Mashudi; Budiyono
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.07

Abstract

Fenomena perubahan iklim telah mengakibatkan perubahan zona agroklimat di sejumlah wilayah di Indonesia. Berdasarkan kondisi tersebut, penelitian ini bertujuan untuk mengidentifikasi perubahan zona agroklimat di Provinsi Papua Barat menggunakan data penginderaan jauh, yaitu data Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) perekaman tahun 1981 – 2020. Zonasi agroklimat dianalisis berdasarkan pengolahan data CHIRPS 30 tahun berturut-turut, yaitu 1981 – 2010 dan 1991 – 2020. Hasil penelitian menunjukkan bahwa Provinsi Papua Barat memiliki 10 Zona iklim berdasarkan hasil pengolahan data CHIRPS tahun 1981 – 2010 yaitu A1, B1, B2, C1, C2, D1, D2, E1, E2, E3, dan 9 zona iklim berdasarkan pengolahan data CHIRPS tahun 1991 – 2020 yaitu A1, B1, B2, C1, C2, D1, D2, E1, dan E2. Secara umum Provinsi Papua Barat didominasi oleh zona iklim A1, B1, dan C1. Pada kurun 2010 – 2020 di Provinsi Papua Barat terjadi peningkatan luas zona iklim A1, B1, B2, C2, D1, dan E2 serta penurunan luas zona iklim C1, D2, E1, dan E3. Hal ini mengakibatkan sejumlah wilayah di Provinsi Papua Barat mengalami perubahan zona agroklimat, yaitu; Kabupaten Manokwari, Kabupaten Manokwari Selatan, dan Kota Sorong.
Pendugaan Umur Simpan Susu Kambing Etawa Kolostrum Bubuk Menggunakan Metode Accelerated Shelf Life Testing (ASLT) dengan, Pendekatan Kadar Air Kritis: Shelf  Life Estimation of  Etawa Goat Milk Colostrum Powder Using the Accelerated Shelf Life Testing (Aslt) Method with a Critical Moisture Content Approach Putri, Dita Ananda; Juwitaningtyas, Titisari
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.08

Abstract

Lamanya waktu product  makanan aman untuk dikonsumsi adalah detail penting yang harus dinyatakan dengan jelas pada label kemasan. Susu bubuk rentan terhadap degradasi oksigen dan uap air karena sifat higroskopisnya, yang mengakibatkan masalah seperti lengket dan menggumpal selama penyimpanan. Penelitian ini mengevaluasi perkiraan umur simpan susu kambing etawa kolostrum bubuk  yang dikemas dalam polietilen dengan pendekatan kadar air kritis dan perubahan kadar lemak awal hingga kadar lemak kritis selama penyimpanan. Nilai kelembaban relatif (RH) yang berbeda digunakan sebagai variabel perlakuan dalam rancangan acak lengkap (RAL) penelitian ini. Beberapa larutan garam jenuh digunakan dalam prosedur pengkondisian RH, termasuk 15% NaOH, 32% MgCl2, 53% K2CO3, 73% NaCl, dan 83% KCl. Kadar air awal, kadar air kritis, kadar air kesetimbangan, kemiringan kurva isotermis, dan umur simpan susu kambing etawa kolostrum bubuk dievaluasi dengan menggunakan persamaan Labuza dan prosedur ini diulang sebanyak tiga kali. Kadar air awal susu kambing etawa kolostrum bubuk adalah 0.0295 gH2O/g padatan, dan kadar air kritisnya adalah 0.0443 gH2O/g padatan, berdasarkan hasil penelitian. Menetapkan hubungan antara kadar air kesetimbangan dan aktivitas air (aw) diperlukan untuk membuat kurva isoterm sorpsi air (ISA). Mean Relative Determination (MRD) digunakan untuk menilai ketepatan model ISA. Model persamaan Caurie menghasilkan nilai MRD sebesar 3.172%, yang mengonfirmasi ketepatannya untuk menilai umur simpan susu kambing etawa kolostrum bubuk. Perkiraan umur simpan susu kambing etawa kolostrum bubuk yang disimpan dalam kemasan polietilen setebal 0,3 mm pada tingkat kelembapan relatif 15, 32, 53, 73, dan 83% berturut-turut adalah 66, 48, 33, 23, dan 20 hari.
Screening of LAB-Compatible Fungi and the Effect of Corncob Substrate Concentration on D(-) Lactic Acid Production using the Multiple Parallel Fermentation (MPF) Approach: Skrining Kapang yang Kompatibel dengan BAL serta Pengaruh Konsentrasi Substrat Tongkol Jagung terhadap Produksi Asam Laktat D(-) melalui Pendekatan Multiple Parallel Fermentation (MPF) Mufidah, Elya; Mifzal, Adib Maula; Veliska, Audrya Nasywa; Rahayu, Farida; Irawati, Maghfira Selia; Wibisono, Yusuf; Sugiarto, Yusron; Nurika, Irnia
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.02

Abstract

Biological production of D(-) lactic acid is being advanced as an eco-friendly alternative to petrochemical routes. This study optimizes D(-) lactic-acid production from corn cobs through Multiple-Parallel Fermentation (MPF), which combines a polysaccharide-degrading filamentous fungus with lactic-acid bacteria (LAB) in a single reactor. The novelty of the work lies in deploying a specific consortium of Aspergillus sp. and Leuconostoc mesenteroides for parallel fermentation of corn-cob biomass—a combination not previously reported. Three fungal isolates and three LAB strains were screened to identify the most compatible pairing. Fermentations were run at initial pH 7.0 and 39 °C with substrate concentrations of 3, 5 and 7% w/v. The 7% loading yielded the highest D(-) lactic-acid titer (14.01 % w/v), although differences among treatments were not statistically significant (p > 0.05). One-way ANOVA satisfied normality and homogeneity-of-variance assumptions, and linear regression indicated a moderate relationship between substrate concentration and lactic-acid yield (R² = 0.429). A D/L ratio exceeding 95:5 across all treatments confirmed selective D(-) isomer formation by L. mesenteroides. These results demonstrate the promise of MPF using local lignocellulosic waste as an efficient, sustainable route to D(-) lactic acid.
Perancangan, Simulasi Kinerja, dan Fabrikasi Mesin Thermopressing untuk Produksi Biofoam Berbasis Material Alami: Design, Performance Simulation, and Fabrication of Thermopressing Machine for Biofoam Production Based on Natural Materials Andi, Moch. Alfi; Lutfi, Musthofa; Lastriyanto, Anang
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.10

Abstract

Krisis lingkungan akibat meningkatnya sampah plastik, khususnya styrofoam, mendorong pengembangan material alternatif seperti biofoam berbasis bahan alami. Biofoam dapat diproduksi melalui metode thermopressing yang membutuhkan mesin andal untuk proses pemanasan dan penekanan secara simultan. Penelitian ini bertujuan untuk merancang, mensimulasikan, dan memvalidasi kinerja mesin thermopressing skala laboratorium. Perancangan dilakukan dengan mempertimbangkan kekuatan struktural dan efisiensi termal, kemudian dianalisis menggunakan Ansys Workbench Student 2024 R2. Simulasi struktural menunjukkan nilai tegangan maksimum sebesar 101.83 MPa, regangan 0.00052235 mm/mm, dan deformasi total 0.002026 mm, dengan nilai safety factor 2.45 yang mengindikasikan bahwa struktur aman. Simulasi termal dan pengujian aktual menunjukkan efisiensi distribusi panas sebesar 61.4%, dengan kehilangan panas sebesar 38.6% melalui konduksi, konveksi, dan radiasi. Perbedaan ini terjadi karena keterbatasan model simulasi dalam memperhitungkan kondisi nyata. Solusi yang diajukan mencakup pemilihan material heater yang lebih konduktif dan penataan ulang posisi heater untuk meningkatkan kontak termal. Hasil penelitian ini menunjukkan bahwa mesin thermopressing yang dirancang dapat berfungsi secara efektif untuk produksi biofoam ramah lingkungan.
Development and Characterization of a Sustainable and Vegan Lip Balm Utilizing Soybean Oil and Carnauba Wax: Pengembangan dan Karakterisasi Lip Balm Berkelanjutan dan Vegan yang Menggunakan Minyak Kedelai dan Lilin Carnauba Subara, Deni; Rukmana, Fitri Hardiyanti; Afifah, Amalia
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.05

Abstract

The demand for organic cosmetics, including lip balms, is increasing. While soybean oil and carnauba wax are known for their beneficial properties in cosmetics, their specific combination in a lip balm formulation has not been previously explored. This study aimed to determine the optimal lip balm formulation from a combination of soybean oil and carnauba wax and to analyze the effect of varying formulations on the product's physicochemical characteristics. The lip balms were prepared using a melt-and-mix method. Physicochemical properties (pH, melting point, adhesion time, loss on drying and greasiness) were evaluated according to the Indonesian National Standard (SNI) 16-4399-1996. A Non-Factorial Completely Randomized Design (CRD) was employed, and the data were analyzed using ANOVA followed by Duncan’s Multiple Range Test (DMRT). Results indicated that the formulation significantly affected (p<0.05) the melting point, adhesion time, greasiness and loss on drying but did not significantly affect the pH. Formulation 5 (F5) was selected as the optimal formulation, exhibiting the following characteristics: a pH of 6.206, a melting point of 66.00 °C, an adhesion time of 9.00 seconds, loss on drying (LoD) 0.043% and greasiness 8.20 cm. Furthermore, hedonic testing revealed that F5 was the formulation most preferred by panelists. In conclusion, the combination of soybean oil and carnauba wax can yield a natural lip balm with desirable properties and high consumer acceptability, with F5 identified as the optimal formulation in this research.
Analisis Water Supply-Demand Index Assessment untuk Produksi Padi Berkelanjutan di Daerah Aliran Sungai (DAS) Serayu Hilir, Provinsi Jawa Tengah, Indonesia: Analysis of Water Supply-Demand Index Assessment for Sustainable Rice Production in Downstream Watershed of Serayu Central Java Province Indonesia Yuzanni, M. Yusfan; Setyawan, Chandra; Susanto, Sahid
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 2 (2025): August 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jkptb.2025.013.02.09

Abstract

Sumber daya air merupakan elemen penting dalam proses produksi padi khususnya di wilayah tropis seperti Indonesia. Penelitian ini bertujuan untuk menganalisis water supply demand index (WSDI) untuk mendukung produksi padi di Daerah Aliran Sungai (DAS) Serayu Hilir, Jawa Tengah. Evaluasi WSDI didasarkan pada perbandingan ketersediaan dan kebutuhan air di wilayah DAS. Analisis ketersediaan air di DAS dilakukan dengan menggunakan model hidrologi tank, sedangkan kebutuhan air irigasi padi ditentukan dengan menggunakan metode Penman-Monteith dengan bantuan software CROPWAT 8.0. Pada proses perhitungan ditetapkan debit andalan 80% sebagai nilai yang mewakili ketersediaan air minimum untuk memenuhi kebutuhan air irigasi tanaman padi. Berdasarkan hasil analisis, WSDI untuk musim tanam pertama (MT1) dan kedua (MT2) diklasifikasikan sebagai “sangat baik”, tetapi musim tanam ketiga (MT3) mengalami ketersediaan air dengan kategori “buruk”, terutama pada tahun 2018, 2019, dan 2020. Hal ini mengindikasikan bahwa terdapat banyak variasi musiman terkait ketersediaan air yang sangat dipengaruhi oleh pola curah hujan. Studi ini merekomendasikan pola tanam padi-padi-hortikultura untuk memaksimalkan penggunaan air, terutama pada MT3 ketika risiko kekeringan meningkat. Analisis WSDI memberikan informasi yang berguna untuk eksplorasi spasial dan terestrial serta menyoroti pentingnya strategi konservasi dalam mengatasi kekeringan di musim kemarau. Pemilihan tanaman hortikutura pada MT3 didasarkan pada kebutuhan air rata-rata tanaman yang lebih rendah, masa tanam singkat, Penelitian ini berkontribusi pada pengembangan strategi pengelolaan sumber daya air yang berguna untuk meningkatkan produksi beras di wilayah DAS yang mengalami perubahan iklim dan tata guna lahan.

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