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Journal : Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering)

Erosion Prediction and Soil and Water Conservation Scenario Using The SWAT Model Candra Dewi, Ni Luh Trisna; Sulastri, Ni Nyoman; Arya Arthawan, I Gusti Ketut; Ngadisih, Ngadisih
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 1 (2024): March 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i1.260-268

Abstract

Increasing population and development has resulted in inappropriate land use within watersheds that increase soil erosion. One of the hydrologic models that can be used to predict erosion and soil and water conservation in a watershed is SWAT. This research was conducted to predict erosion and the guidance of soil and water conservation in the Yeh Empas Watershed. This research was carried out in several stages, including data collection, data analysis and map validation using the ROC (receiver operating characteristic) and AUC (area under curve) methods. Results revealed that Yeh Empas Watershed had a very light EHL (erosion hazard level) category was found in the downstream area with an annual erosion value of 0 – 14.68 t/ha. In the middle area, the EHL was categorized as light with an erosion value of 15.44 – 57.22 t.ha-1.y-1. The upstream area has moderate EHL with a value of 65.20 – 178.64 t.ha-1.y-1. The validation of the EHL map using the ROC method showed a result of 0.83. This value was classified as very good. It can be concluded that SWAT predictions can be used in estimating erosion and soil and water conservation scenario to reduce 85% erosion. Keywords: Erosion prediction, Soil and water conservation scenario, SWAT models, Yeh Empas Watershed.
Estimating Crop Water Requirements to Evaluate Cropping Patterns for Agriculture on Post-Tin Mining Land Maftukhah, Rizki; Pitaloka, Novita Dyah; Murtiningrum, Murtiningrum; Ngadisih, Ngadisih
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 3 (2025): June 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i3.960-970

Abstract

Utilization of degraded land, such as post-mining land, for agricultural purposes necessitates significant effort, particularly land and water management. This study focuses on estimating crop water requirements (CWR), a crucial step in evaluating suitable cropping patterns for agricultural development on post-tin mining in Bangka Island. The CWR and effective rainfall (EF) of rice, cassava, and peanuts were estimated using meteorological data between 2019 and 2023. The CWR was calculated using Penman-Monteith method, while EF was determined using the USDA SCS Method. The results indicate that average potential evapotranspiration (ETo) from 2019 to 2023 varied across years. The highest ETo values were predicted as 5.6 to 5.8 mm/day, while the lowest value was estimated at 4.3 mm/day. Rice and peanut cultivation require supplemental irrigation since EF is insufficient to meet CWR. Cassava, is more suitable, with EF generally fulfilling its CWR. This study provide useful information for developing adaptive strategies that account for the effects of climatic conditions and different cropping pattern, particularly in degraded areas. Furthermore, crop selection that is adapted to the degraded area offers a long-term solution for rehabilitating degraded areas. Keywords: Agriculture, Degraded soil, Irrigation, Yield.
Effect of Microclimate Temperature and Relative Humidity on the Postharvest Quality of Coconut Sap and Sugar Rahayoe, Sri; Dewi, Hilda Maya Sintia; Nugroho, Andri Prima; Saputro, Arifin Dwi; Ngadisih, Ngadisih
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 3 (2025): June 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i3.899-910

Abstract

Coconut sap, increasingly recognized as a functional sweetener, is highly perishable and influenced by environmental conditions during postharvest handling, yet the specific impacts of microclimatic variables such as temperature and relative humidity (RH) on sap and sugar quality remain inadequately studied. This research investigates the effects of RH and temperature on key physicochemical parameters of coconut sap—pH, Brix, and density—and evaluates their influence on coconut sugar quality, focusing on moisture, ash content, and color. Sap was collected biweekly in Central Java over a five-week period and analyzed in conjunction with environmental data recorded using an IoT-based weather station. Increased RH was significantly associated with decreased sap pH (r = –0.482, p = 0.007) and showed a weak negative correlation with Brix. Density remained stable across varying RH levels. Although temperature showed visual trends in sap quality parameters, statistical analysis did not reveal significant correlations, likely due to the narrow temperature range during the observation period. Throughout sugar processing, TSS increased consistently across boiling, saturation, and oversaturation stages. Final sugar blocks maintained stable moisture (6–8%) and ash content (1.8–2.2%), with color variations reflecting Maillard and caramelization reactions. Maintaining RH below 85% is recommended to preserve sap quality and product consistency. Keywords: Coconut sap, Coconut sugar, Postharvest quality, Relative humidity, Temperature.
Assessment of Soil and Water Conservation Potential Using Vetiver Crops (Chrysopogon zizanioides) as a Nature-Based Solution for Watershed Restoration Setyawan, Chandra; Nugraheni, Yekti; Ngadisih, Ngadisih; Maftukhah, Rizki; Safrina, Devi
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 5 (2025): October 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v14i5.1785-1797

Abstract

Watersheds play an important role in the hydrological cycle to ensure water availability and support food security. Currently, many watersheds are experiencing degradation due to excessive agricultural practices without the implementation of soil and water conservation measures. This study aims to assess the potential of Vetiver crops (Chrysopogon zizanioides L.) for soil and water conservation as a nature-based solution for watershed protection.n. This research use Geographic Information System (ArcGIS) tools to analyze land suitability for Vetiver cultivation. A multi-criteria evaluation approach was applied using a scoring system based on key environmental indicators including rainfall, temperature, slope gradient, land use type, soil type, and organic matter content. The results indicate that most of the study area was classified as moderately suitable (61.98%) and marginally suitable (38.00%) for vetiver plants, with only 0.01% falling into the highly suitable and not suitable categories, respectively. The integration of spatial analysis and environmental indicators allowed for the identification of priority areas where Vetiver could be effectively implemented to enhance watershed resilience, mitigate erosion, and support sustainable land management. The finding of this study provides a reference for vegetation method development using crops with economic value which is suitable for tropical areas.