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Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering)
Published by Universitas Lampung
ISSN : 2302 559X     EISSN : 2549 0818     DOI : -
Core Subject : Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Engineering
Jurnal Teknik Pertanian Lampung or Journal of Agricultural Engineering (JTEP-L) is a peer-reviewed open-access journal. The journal invites scientists and engineers throughout the world to exchange and disseminate theoretical and practice-oriented researches in the whole aspect of Agricultural Enginering including but not limited to Agricultural Mechanization, Irrigation, Soil and Water Engineering, Postharvest Technology, Renewable Energy, Farm Structure, and related fields. The first issue was published in October 2012 by Department of Agricultural Engineering, Faculty of Agriculture, University of Lampung. Jurnal Teknik Pertanian Lampung has ISSN number 2302 - 559X for print edition on October 10, 2012 then 2549 - 0818 for online edition on January 10, 2017. Jurnal Teknik Pertanian Lampung is issued periodically four times a year in March, June, September, and December. Jurnal Teknik Pertanian Lampung has been indexed by Google Scholar, Crossref, Directory Open Access Journals (DOAJ), and CABI. Since Volume 5 Issue 1 (2016) Jurnal Teknik Pertanian Lampung has been accredited as SINTA 3 by Directorate General of Higher Education (DIKTI). Starting Volume 10 Issue 3 (2021) the journal received accreditation SINTA 2.
Arjuna Subject : -
Articles 1,203 Documents
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The Effect of Biosaka Elicitor Types and Concentrations on the Growth and Yield of Chili Pepper (Capsicum frutescens L.) Andrian Tri Susanto; Makhziah Makhziah; Juli Santoso
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.1195-1207

Abstract

Chili pepper (Capsicum frutescens L.) is an important horticultural crop that requires sufficient production to meet increasing market demand. This study aimed to evaluate the effects of Biosaka elicitor composition and concentration on the growth and yield of chili pepper. The experiment was arranged in a two-factor factorial Randomized Complete Block Design (RCBD) with three replications. The first factor was Biosaka composition (J), consisting of five formulations: J1 = babandotan, J2 = J1 + pukul empat, J3 = J2 + patikan kebo, J4 = J3 + meniran, and J5 = all biosaka materials. The second factor was Biosaka concentration (K), consisting of three concentration levels: K1 = 1.5 mL/L, K2 = 2.5 mL/L, and K3 = 3.5 mL/L. The results showed that Biosaka composition significantly affected plant height at 21–63 DAT, stem diameter at 28–63 DAT, leaf number at 21–63 DAT, fruit number per plant at the fifth harvest, and fruit weight per plant at the first and fifth harvests. Biosaka concentration significantly affected plant height at 21 DAT and 42–56 DAT, leaf number at 49 and 56 DAT, and fruit number (total fruit number and fruit number per plant) at the first, fourth, and fifth harvests. Overall, the J5 formulation and the concentration of 2.5 mL/L tended to produce the most favorable growth responses in chili pepper plants.
Grading Coffee Beans using Extraction of Shape-Based Features Coupled with Support Vector Machine Agus Dharmawan; Rudiati Evi Masithoh; Siswoyo Soekarno; Hanim Zuhrotul Amanah
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.895-906

Abstract

Evaluating coffee beans through a computer vision system (CVs) requires a large number of visual attributes to be extracted, but may affect prediction accuracy. Therefore, it is essential to reduce the large features to gain better prediction accuracy by generating new data that represents the most informative dimensions of the original data. Previous studies are limited to comparing different methods of feature extraction. The objective of this research was to explore the comparison of six feature extraction methods (PCA, EFA, LDA, SVD, ICA, and PLS) combined with support vector machine (SVM) as a supervised approach to predict three groups of coffee beans, namely long-berry, normal, and peaberry, for grading issues. SVM with three kernel functions (linear, RBF, and sigmoid) was used to construct a superior classification model. Data were acquired from coffee images processed to generate shape-based features. The results show that LDA provides a better visualization in separating sample classes according to the score plot with 2 variables obtained. The combination of SVM and LDA has a better recognition of coffee beans for grading, which is higher than that of other combinations. A combination of SVM-sigmoid with EFA gave mostly the worst recognition. Our findings proved that the investigation of feature extraction methods and SVM successfully achieve accurate results on grading coffee beans.
Effect of Phosphorus Fertilizer Application Timing and Dosage on the Growth and Yield of Snow Pea (Pisum sativum L.) Dita Widianti; Widiwurjani Widiwurjani; Agus Sulistyono
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.1232-1240

Abstract

Snow pea (Pisum sativum L.) is a high-value vegetable crop with increasing market demand; however, its productivity remains relatively low due to suboptimal cultivation practices, particularly phosphorus (P) fertilization management. This study aimed to evaluate the effects of phosphorus fertilizer application timing and dosage on the growth and yield of the Taichung variety of snow pea. The experiment was conducted in Mojoroto Village, Pacet District, Mojokerto Regency, Indonesia, using a factorial Randomized Block Design (RBD) with two factors: phosphorus fertilizer application timing (at planting, 7 days after planting [DAP], and 14 DAP) and phosphorus fertilizer dosage (60, 80, 100, and 120 kg/ha). The results showed that the combination of phosphorus fertilizer applied at 100 kg/ha and 7 DAP produced the highest number of pods, pod weight per plant, and pod yield per hectare. Furthermore, phosphorus application at 7 DAP enhanced nutrient uptake efficiency during the early vegetative stage, while a dosage of 100 kg/ha significantly increased yield components, resulting in a pod weight of 99.72 g/plant. These findings indicate that optimizing both the timing and dosage of phosphorus fertilizer application can improve the productivity and yield quality of snow pea and provide a basis for technical fertilization recommendations for highland cultivation.
Effects of MKP Concentration and Apical Pruning on the Growth and Yield of Melon (Cucumis melo L.) var. Inthanon under NFT Hydroponics System Yuki Erwanto Putri; Ramdan Hidayat; Nova Triani
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.907-917

Abstract

Melon (Cucumis melo L.) is a horticultural crop with high economic value, but its production is still low due to suboptimal cultivation techniques, especially in terms of fertilization and pruning. This study aims to determine the effect of monopotassium phosphate (MKP) fertilizer concentration and shoot pruning on the growth and yield of Inthanon melon variety. The study was conducted in the greenhouse, using a factorial Completely Randomized Design (CRD) with two factors, namely: MKP fertilizer concentration (0, 5, 10, and 15 g/L) and shoot pruning (internodes 25, 28, and 30). The results showed that the combination of MKP 15 g/L and pruning at the 30ᵗʰ internode gave the best results in terms of fruit weight and fruit flesh thickness. MKP 15 g/L fertilizer had a very significant effect on the parameters of plant length, stem diameter and number of leaves. Pruning shoots at the 30ᵗʰ internode increased the efficiency of assimilate distribution to the fruit. The application of MKP at 15 g/L combined with pruning at the 30ᵗʰ internode increased fruit weight 22.12% and fruit diameter 11.38% compared to control.
DAMPAK APLIKASI INSEKTISIDA BERBAHAN AKTIF EMAMEKTIN BENZOAT DAN DELTAMETRIN TERHADAP MORTALITAS DAN KEMUNCULAN IMAGO Trichogramma japonicum DI LABORATORIUM Hanif Maulana Ahmad; Noni Ramadhini; Hery Nirwanto
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.1007-1013

Abstract

The use of chemical insecticides remains the primary solution to agricultural pest problems. The use of insecticides does not entirely solve the problem, but can disrupt the existence of non-target organisms (parasitoids). This research aims to determine the effects of the active ingredients emamectin benzoate and deltamethrin on the mortality, morphological behavioral changes, and the emergence rate of T. japonicum imagoes. Testing was conducted using fresh residual and fresh residual contact methods. The process of rearing T. japonicum imagoes included breeding the host C. cephalonica, preparing the substrate, and rearing T. japonicum. Fresh residual and fresh residual contact tests were conducted using field concentrations of 2 ml/L and 3 ml/L, respectively for active ingredients emamectin benzoate and deltamethrin. Observation parameters included mortality rates, morphological changes, behavioral changes, and the emergence rate of T. japonicum imagoes. Mortality data were analyzed using a normality test. If the data were not normally distributed, the Kruskal-Wallis test (non-parametric) and Mann-Whitney test were employed, along with probit analysis of the lethal time 50 (LT50). The research results showed that the active ingredients emamectin benzoate and deltamethrin were harmful to the mortality and emergence of T. japonicum imagoes, with average LT50 values of 84 minutes and 46 minutes, respectively. Exposure to insecticides caused T. japonicum imagoes to exhibit abnormalities in wing folding and behavioral changes, resulting in reduced activity.
Studi Laju Pengeringan Umbi Porang pada Berbagai Ukuran Umbi dan Periode Panen Saifuddin Afif; Sri Rahayoe; Eni Harmayani; Fertika Nur Fitriyana; Lisa Astiana Ghina
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.882-894

Abstract

Porang (Amorphophallus oncophyllus) is a strategic glucomannan source for food and industrial applications, whose chip and flour quality is strongly influenced by drying performance; however, the combined effects of harvest month and tuber size on convective drying kinetics remain poorly quantified. This study estimated the convective heat transfer coefficient (h) and effective drying rate constant (k) of 7-mm porang slices using a coupled heat–mass balance framework. Tubers were classified into three size categories and dried in a 50 °C cabinet dryer across five harvest months (June–October), with continuous monitoring of air and product temperatures. The Lewis thin-layer model was solved numerically using a fourth-order Runge–Kutta method, and parameters were estimated by minimizing the mean absolute percentage error. Product temperature profiles showed rapid initial heating, a quasi-steady plateau at 43–46 °C, and a final rise, indicating dominance of the falling-rate regime. Estimated h ranged from 42 to 72 W·m⁻²·°C⁻¹ and kₚ from 2.70 to 3.99 h⁻¹. Two-way ANOVA showed no significant effects of harvest month, tuber size, or their interaction (p > 0.05), supporting the use of effective average parameters for robust drying-process standardization and scale-up.
Sensory Profiling and Consumer Preference of Local Bogor Coffee Brands Using CATA (Check-All-That-Apply) Method Muhammad Fakih Kurniawan; Siti Nursaidah Rahmah; Tiara Amanda Lestari
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.930-941

Abstract

Coffee has complex sensory characteristics, such as aroma, flavor, texture, color, and aftertaste. While various local coffee products are available in Bogor, studies on sensory attributes and consumer preferences are limited. This study aimed to evaluate the sensory profiles and preference levels of four local Bogor coffee brands using the CATA method. The samples consisted of commercially available local Bogor coffee products, including robusta-based coffee and an arabica–robusta blend produced by local roasters. A total of 29 sensory attributes were identified through focus group discussions (FGDs) with eight trained panelists and evaluated by 50 general consumers. Hedonic testing was also conducted and analyzed using preference mapping. The results showed that earthy, floral, chocolate, and spicy sensory attributes tended to increase consumer preference, while smoky aroma and rubbery and burned flavors decreased it. Ideal coffee attributes include brown color, fruity flavor, chocolate and spicy aromas, light body, and sour aftertaste. Samples 669 and 614 showed the highest preference cluster (60–80%), while 471 and 628 achieved the lowest (20–40%). These findings demonstrate the importance of sensory attributes in influencing consumer preferences and can serve as a guide for local Bogor coffee producers.
Effect of Compaction Pressure and Drying Duration on the Characteristics of Biochar Briquettes from Coconut Shell and Sugarcane Bagasse Welly Deglas; Fransiska Fransiska; Maria Krisna Evania
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.942-952

Abstract

The combination of coconut shell and sugarcane bagasse in biochar briquettes is of significant interest due to the potential for enhancing the sustainability and energy efficiency of biomass-based fuels. This study explores the unique synergy between these two widely available agricultural residues, aiming to optimize their properties for higher-quality biochar briquettes. Understanding the impact of varying drying times and pressing pressures on the physicochemical characteristics of the briquettes is essential for improving their performance as an eco-friendly energy source. The moisture content ranged from 2.21% to 15.59%, with the lowest value meeting the Indonesian National Standard (SNI ≤ 5%). Ash content exceeded the SNI limit (≤ 8%) at 9.66% after 24 hours of drying at 50 kg/cm² pressure. Volatile matter varied between 12.03% and 15.00%, with the lowest value aligning with SNI standards (10–15%). Fixed carbon content reached a maximum of 72.73%, indicating optimal carbon retention. Calorific values ranged from 4552.67 to 5941.91 cal/g, falling short of the SNI minimum (6814.11 cal/g) due to the inclusion of low-energy bagasse. The shatter index peaked at 31.00% at the lowest pressure and shortest drying time, indicating poor mechanical durability. In conclusion, briquettes processed with at least 24 h drying and 100 kg/cm² pressure yielded the best performance, meeting multiple SNI quality criteria, especially for moisture, volatile matter, and fixed carbon.
The Effect of Thermal and Alkaline Pretreatment in POME (Palm Oil Mill Effluent) as a Substrate for Dark Fermentation Process on Biohydrogen Production Amna Citra Farhani; Bintang Sipartogi Panjaitan; Ni Wayan Arya Utari
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.1222-1231

Abstract

Palm Oil Mill Effluent (POME) is a promising substrate for biohydrogen production through dark fermentation, although pretreatment is often required to enhance hydrogenogenic activity. This study evaluated the effects of alkaline (NaOH) and thermal pretreatments on POME characteristics and hydrogen production. Fresh POME was sieved and adjusted to initial pH values of 6, 7, or 8 using 6 M NaOH, with or without heat shock treatment (100 °C for 60 min). Batch fermentation was conducted at 60 °C for 24 h, while pH, oxidation-reduction potential (ORP), and dissolved oxygen (DO) were monitored. Pretreatment shifted POME conditions from acidic and oxidative to neutral-alkaline and reductive environments, with several treatments achieving ORP values below −200 mV, indicating favorable anaerobic conditions. Refrigerated storage reduced pH and increased ORP, whereas NaOH addition increased pH and lowered ORP. Hydrogen production varied among treatments. The highest yield was obtained from fresh POME adjusted to pH 7, producing 0.03655 g H₂ with an ORP of approximately −514 mV. In contrast, stored POME subjected to pH 7 adjustment and heat shock produced substantially lower hydrogen yields. In a second batch, pH 8 treatments generated 0.01157–0.02002 g H₂, representing 2.4–3.1 times higher production than the controls, while pH 6 treatments showed the lowest yields. Overall, neutral-to-alkaline pH and strongly negative ORP were associated with improved biohydrogen production.
PEMANFAATAN LIMBAH TANAMAN BOKASHI UNTUK BUDIDAYA MELON (Cucumis melo L.) ORGANIK Nurseha Nurseha; Nurlianti Nurlianti; Septia Yessi Rhamadani; Prihanani Prihanani; Farida Aryani
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.953-962

Abstract

Bokashi compost is produced through fermentation of organic wastes in an airtight condition using beneficial microbes. This creates a nutrient-rich pre-compost that can be used to enrich the soil. This study investigated the effect of Bokashi type and fermentation age on the growth and yield of organic melon (Cucumis melo L.). A factorial Completely Randomized Design (CRD) with two factors was employed: Bokashi type (oil palm empty fruit bunches, mahogany leaves, and water guava leaves) and fermentation age (1, 5, and 10 months). The results showed that fermentation age significantly affected all observed variables, while Bokashi type significantly influenced flowering time, fruit weight, and fruit diameter. The highest fruit weight (1521.71 g) and diameter (19.07 cm) were obtained from 10-month fermented Bokashi. Among Bokashi types, water guava leaf Bokashi produced the best yield (979.70 g). These findings indicate that extended fermentation improves nutrient availability and enhances melon productivity under organic cultivation systems.

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