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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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Jelai Starch–Na-Alginate Film Reinforced with Bacterial Cellulose and Glycerol Plasticizer for Minimally Processed Pineapple Coating Sukmiyati Agustin; Muhammad Fajar Rahmadani
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.v15i3.1023-1036

Abstract

Jelai is a natural source of starch that is widely found in East Kalimantan but has not been extensively explored for its utilization. Edible films from jelai starch–Na-alginate generally exhibit high hydrophilicity and poor mechanical properties. This research aimed to improve these characteristics by incorporating bacterial cellulose (BC) as a filler and glycerol as a plasticizer, and to evaluate the effectiveness of the optimal formulation on minimally processed pineapple. The study utilized a Factorial Completely Randomized Design with two factors: BC concentration (0.1%, 0.2%, 0.3%) and glycerol concentration (0.5%, 1.0%, 1.5%) with 3 replications. The data were analyzed using ANOVA, and continued with Tukey’s test. The results showed that the interaction between BC and glycerol significantly affected solubility and tensile strength. Glycerol significantly affected thickness, Water Vapor Permeability (WVP), and elongation. The best treatment (0.3% BC and 1.0% glycerol) yielded a tensile strength of 14.0 MPa, elongation of 4.39%, solubility of 44.23%, and WVP of 0.03716 g⸳mm⸳kPa–1⸳day–1⸳m–2. The optimized coating effectively maintained a significantly higher pH (p < 0.05) in minimally processed pineapple than the control during 8 days of storage, indicating its potential to slow acidification and preserve product stability. The addition of BC and glycerol successfully improved the mechanical properties of the film and showed potential for maintaining pH stability in fresh-cut fruits.
Performance Comparison of Recursive and Semi-Recursive Random Forest Models for Monthly Rainfall Prediction in the Bogowonto Watershed Yulian Kusuma Ari Setiadi; Hanggar Ganara Mawandha; Sigit Supadmo Arif
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.v15i3.1180-1194

Abstract

Unpredictable rainfall is considered a major challenge for agricultural systems in Indonesia, especially in the preparation of planting calendars. Therefore, accurate rainfall predictions are essential for agricultural systems to be more adaptive to climate change. The aim of this study is to analyse and compare the accuracy of two monthly rainfall prediction schemes, namely recursive and semi-recursive approaches, by using the Random Forest algorithm. Climatological data from four stations in the Bogowonto Watershed were used, and the modelling process included data pre-processing, feature engineering (lag, rolling window, and seasonal transformation), and grid search with cross-validation to obtain the optimal parameter combinations. Model performance was evaluated on out-of-sample test and validation data by using RMSE, MAE, NSE, and R². The semi-recursive approach improved NSE from 0.20–0.33 to 0.53–0.61 and reduced RMSE from 210.68–255.75 mm to 150.79–211.31 mm, while R² values increased from 0.23–0.50 to 0.72–0.82 across the four stations. These results indicate that the semi-recursive approach is more stable in predicting monthly rainfall and thus is recommended for planning a planting calendar in Bogowonto Watershed.
Effect of Immersion Time and Packaging Type on the Quality of Curly Red Chili Coated with Chitosan–Aloe vera Muhammad Rifqi; Sherina Zahran Tiara; Tiana Fitrilia
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.v15i3.1044-1056

Abstract

Curly red chili has a short shelf life such that post-harvest handling techniques, including edible coatings, are essential. This study aimed to determine the effect of edible coating immersion time and packaging type on the shelf life of curly red chili. The experiment used a completely randomized design (CRD) with two factors: immersion duration (5, 7.5, and 10 minutes) and polypropylene (PP) plastic packaging type (non-perforated and perforated). Data were analyzed using a Two-Way ANOVA, followed by Duncan's Range Multiple Test (DMRT) at a 95% confidence level. The parameters measured included weight loss, moisture content, vitamin C content, and respiration rate. The optimal treatment was A1B2 (5-minute immersion with perforated PP packaging), which achieved the highest vitamin C content (460.32 mg/100g), the lowest respiration rate (1.89 mg CO₂.kg–1.h–1), a weight loss of 26.82%, and a moisture content of 67.73%. Although weight loss in A1B2 was higher than in non-perforated packaging treatments, vitamin C and respiration rate were prioritized as key nutritional and metabolic quality indicators. Compared to control in perforated packaging (A0B2), treatment A1B2 yielded 24.60% higher vitamin C retention, demonstrating the added value of the chitosan–Aloe vera coating
Effect of Soil Conservation on Soil Erosion and Plant Performance under Pine–Durian Agroforestry Systems in Perhutani Production Forest Arif Firmansyah; Kurniawan Sigit Wicaksono; Cahyo Prayogo; Didik Suprayogo
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.v15i3.1057-1070

Abstract

Logging activities in pine production forests create open land that increases surface runoff and soil erosion, highlighting the need for soil conservation during the early stages of agroforestry development. This study evaluated the effectiveness of mechanical and vegetative conservation practices, including biogeotextiles, in reducing runoff and erosion and improving plant growth and farm profitability in an early-stage pine–durian agroforestry system. A randomized factorial block design with two factors and a non-factorial control was applied. Mechanical conservation treatments included no terraces, ridge terraces, and bench terraces, while vegetative conservation treatments consisted of chili monoculture, peanut monoculture, chili–peanut intercropping, and intercropping combined with biogeotextiles. Results showed that mechanical conservation significantly reduced runoff and erosion, with bench terraces providing the greatest reductions (33–53% runoff; 48–75% erosion), followed by ridge terraces. Biogeotextiles further reduced erosion by up to 68%, although they increased implementation costs. Pine and durian growth were not significantly affected, whereas chili productivity increased under intercropping and terraced systems. Economically, bench terraces produced the highest profitability (R/C >6). Overall, integrating mechanical and vegetative conservation effectively improved hydro-logical function, crop productivity, and farm income in pine–durian agroforestry systems.
Effect of Shade Intensity and Soil Types on the Vegetative Growth and Chlorophyll Content of Javanese Pepper (Piper retrofractum Vahl.) Seedlings Reo Sambodo; Angki Intan; Wafit Dinarto; Dian Astriani
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.v15i3.1254-1263

Abstract

Javanese pepper is an indigenous Indonesian spice with high economic value and widely utilized as a traditional medicinal plant. Efforts to increase Javanese pepper production require cultivation optimization, particularly during the nursery stage, which is a key factor in the success of on-farm cultivation. This study aimed to determine the optimal nursery conditions for Javanese pepper in terms of shading intensity and soil type. The study employed a two-factor factorial Randomized Complete Block Design (RCBD). The first factor was shading intensity: N1 = 0%, N2 = 50%, N3 = 70%, and N4 = 90%. The second factor was soil type: T1 = Vertisol, T2 = Regosol, and T3 = Latosol. There were 12 treatment combinations replicated three times, resulting in 36 experimental units. Each unit consisted of five plants, totaling 180 polybags. The selection of soil types was based on the dominant soil distribution in the Special Region of Yogyakarta. Observation data were analyzed using Analysis of Variance (ANOVA) followed by Duncan’s Multiple Range Test (DMRT) at the 5% significance level when significant effects were observed. The results showed that the best growth of Javanese pepper seedlings was obtained in Regosol soil under 50–90% shading intensity.
Assessing Two Optimized Smart Automated Irrigation Systems for Four Chili Cultivars Zammy Rivaldo; Lukita Devy; Miftahul Huda Fendiyanto; Haryo Prastono; Rina Aprianti
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.v15i3.1071-1086

Abstract

Chili is one of the most important horticultural crops and a strategic national commodity. Efficient irrigation management is essential to sustain its productivity, particularly under increasing climate variability and water scarcity. This study evaluated the effects of two automated irrigation systems on the growth and yield of chili cultivars. The greenhouse experiment employed a split-plot design with two irrigation treatments—environmental sensor-based automatic irrigation (S1) and scheduled irrigation (S2)—on four chili cultivars (Arisa, Adelina, Genie, and Bara). Growth traits, including plant height, dichotomous height, number of leaves, number of branches, stem diameter, and SPAD, were observed weekly, while yield traits (fruit number, fresh weight, dry weight, average fruit weight, and fruit length) were measured at harvest. Results revealed no significant effect of interaction. Irrigation system affected number of branches, while varieties affected plant height, dichotomous height, SPAD and all yield traits except fruit number. The two irrigation systems did not statistically differ in yield, however, S1 consistently resulted in higher yield and save 61% water usage compared to S2. These findings indicate that S1 can enhance resource efficiency without compromising productivity, drought tolerant chili cultivars are recommended for supporting the sustainable cultivation of chili as a strategic commodity.
Analysis of Land Use Impacts on Flood Propagation and Inundation Area Using 2D HEC-RAS Modeling: A Case Study of the Babakan Watershed, Central Java Arief Yudho Wicaksono; Mohammad Farid; Vika Febriyani; Aji Prakoso Nimanto
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.v15i3.1098-1114

Abstract

The Babakan Watershed is located in Brebes Regency, Central Java Province, and represents one of the river systems that experiences recurrent flooding events annually. These events indicate a high vulnerability of the area to changes in hydrological characteristics driven by land use dynamics. This study aims to evaluate the effects of land use change on the hydrological and hydraulic responses of the Babakan Watershed and their implications for flood potential and characteristics. The methodology applies the Soil Conservation Service–Curve Number (SCS–CN) Synthetic Unit Hydrograph approach based on land use data from 2015 and 2022, with the application of a 20-year return period design discharge calibrated against bankfull water level conditions of the Babakan River to ensure consistency with the actual channel capacity. The hydrological analysis results show that the 20-year return period peak discharge (Q20) in 2022, at 274.63 m³/s, is lower than that in 2015, which reached 285.57 m³/s, indicating a reduced flood response associated with land use changes. Integration with hydraulic modeling reveals a decrease in Curve Number (CN), an increase in the percentage of impervious areas reflecting improved watershed infiltration capacity, as well as reductions in flood inundation extent and flow velocity. These findings confirm that integrated hydrological–hydraulic approach is effective for evaluating the impacts of land use change on flood propagation and risk in the Babakan Watershed, while also supporting improved preparedness and watershed management planning for future flood events.
Assessment of Leachate Treatment Efficiency and Its Impact on Surface Water Quality at the Blang Bintang Landfill, Aceh Besar Jonianto Jonianto; Ichwana Ramli; Suhendrayatna Suhendrayatna; Sri Mulyati; Mariana Mariana
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.v15i3.1115-1129

Abstract

This study aims to evaluate the effectiveness of the leachate treatment plant at the Blang Bintang Regional landfill and analyze its impact on the water quality of the Krueng Uteun Siblah River. The method used is a comparative analysis of leachate quality monitoring data (influent and effluent) from the landfill from 2021 to 2025. The results showed that the treatment plant successfully reduced the concentration of pollutants in leachate, with an average efficiency percentage for the parameters of Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), and Total Suspended Solids (TSS) Nitrate, NH₃, Cd, Fe were 23.87%, 64.15%, 50.53%, 35.26%, 62.19%, 71.05%, and 40.18%, respectively. However, effluent values for COD and BOD parameters still exceed the established quality standards. Further analysis of the Krueng Uteun Siblah River revealed a significant decline in water quality immediately after the leachate outfall point, marked by a spike in BOD (27.4-30 mg/L), COD (51.17-62 mg/L), and iron concentration (3.65-4.21 mg/L) that exceeded quality standards, as well as a drastic decrease in Dissolved Oxygen (DO) levels to 3.5 mg/L improving the performance of leachate treatment facilities and implementing stricter management strategies are absolutely necessary to protect the aquatic ecosystem around the landfill.
Effectiveness of Low-Cost Ozone Treatment in Preserving the Postharvest Quality of Chilli Pepper under Tropical Ambient Storage Indriati Meilina Sari; Kiky Nurfitri Sari; Andika Prawanto; Paisal Ansiska
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.v15i3.1264-1276

Abstract

Postharvest losses of red chilli peppers remain a significant challenge in tropical regions, particularly under ambient storage conditions where access to refrigeration is limited. This study evaluates the effectiveness of simple ozonation at different exposure durations in maintaining the quality of red chilli peppers and identifies the optimal treatment duration based on quality preservation performance. A controlled experimental design with four treatments, consisting of no ozone exposure and ozonation for 5, 10, and 15 min, was applied. Quality parameters included weight retention, firmness, vitamin C content, water content, and microbial load were observed during ten days of storage. The results showed that ozonation significantly affected all measured parameters, with longer exposure durations generally improving quality retention and reducing microbial growth. However, the 10-min treatment demonstrated comparable performance to that of 15-min treatment across most variables, indicating that an optimal exposure duration had been reached. These findings suggest that simple ozonation can serve as a practical and effective postharvest approach for maintaining red chilli quality under tropical ambient conditions, particularly for small-scale applications.
Characteristics of Dioscorea esculenta Starch Exposed to Citric Acid and Autoclaving-Cooling Treatment Andriana Puspitasari; Yudi Pranoto; Priyanto Triwitono; Dwi Larasatie Nur Fibri
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.v15i3.1087-1097

Abstract

Starch is an abundant carbohydrate reserve found in plants, such as Dioscorea esculenta. Starch can be a staple food and energy source. However, native starch has limitations, required modification processes. The research investigated effect of citric acid and autoclaving-cooling in several cycles for its starch characterization. Starch was extracted and pretreated with citric acid (0.1 M) for 6 h at a ratio of starch and water of 1:4 (w/v). Starch was then modified by autoclaving-cooling using different cycles (1, 2, 3, 4, and 5). Analyses included recovery yield, proximate composition, amylose content, water or oil holding capacity, solubility, swelling power, and color. The results showed no significant difference in the recovery yield, decreased protein, and increased amylose. Autoclaving-cooling modification in Dioscorea esculenta starch enhances the water holding capacity (WHC), oil holding capacity (OHC), and solubility, while reducing its swelling power. In terms of the color of starch after modification by autoclaving-cooling, there was a decrease in lightness (L*) and the whiteness index (WI) values. The results suggested that starch produced with two cycles of autoclaving-cooling was better, as indicated by an increase in amylose content of 25.14%. These findings are expected to provide alternative sources of functional foods and contribute to the utilization of local food ingredients.

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