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All Journal Jurnal Keteknikan Pertanian Tropis dan Biosistem Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering)
Yuzanni, M Yusfan
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Agriculture, Biological Sciences & Forestry Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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Rainfall-Runoff Modelling in Tropical River Basin for Water Conservation Planning Using Water Recharge Ponds Yuzanni, M Yusfan; Setyawan, Chandra; Susanto, Sahid; Nugraheni, Yekti
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 4 (2024): December 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i4.1171-1181

Abstract

Land conversion in river basins poses a threat to future water availability. This research aims to estimate water availability, particularly stream flow for planning of water conservation. Water availability was analyzed using a hydrology tank model. The model was calibrated by using stream flow data measured in a reservoir and then used to estimate water availability in the reservoir's catchment area. The value of model parameters such as wet infiltration coefficient (WIC), dry infiltration coefficient (DIC), soil moisture capacity (SMC), initial soil moisture (ISM), initial groundwater storage (IGWS), groundwater recession constant (k) was determined through the calibration process. The results showed that the model has good accuracy for stream flow calculation indicated by the value of statistical parameters i.e. coefficient of correlation (R) = 0.93, a volume of error (VE) = 0.04, and a coefficient of efficiency (CE) = 1.00. During the wet season, the specific maximum discharge is 0.11 m3s–1km–2. Meanwhile, the minimum specific discharge is 0.030 m3s–1km–2. These differences indicate that optimizing rainwater harvesting during the wet season is required. Rainfall-runoff modeling reveals the potential for surface runoff during the wet season is 1,139 mm. This finding provides an essential reference for water conservation, especially using water recharge ponds. Keywords: Hydrology tank model, Stream flow, Tropical river basin, Water availability, Water conservation.
Analysis of the Application of Subsurface Drip Fertigation Installation on the Growth Response of Lettuce Plants (Lactuca sativa L.) Yuzanni, M Yusfan; Sumarsono, Joko; Abdullah, Sirajuddin Haji
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 3 (2025): December 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Water resources are one of the important factors in the agricultural process. The availability of water in an area is strongly influenced by several factors such as climate, rainfall, regional topography, and land use change. Adoption of an effective and efficient irrigation system to support crop growth is needed. This study aims to design a subsurface drip fertigation system for lettuce crops and determine the response to cow urine fermentation fertilizer. The research method used is an experimental method with field experiments using subsurface drip fertigation. The research parameters were soil physical properties, emitter droplet uniformity, crop water requirements, soil wetting area, pressure head, storage water reduction, lettuce crop growth, and crop productivity. The results showed that the uniformity value of the emitter droplets before being applied to the field was 58.03%. At the same time, the emitter uniformity value after being applied to the area was 81.8%, which is classified as good and can be applied in the field to support the growth of lettuce crops. In addition, the wetting range and pressure values were 14.66 cm and 4.9 cm. The results of plant growth observations, such as the total leaf area of 60.5 cm, the average number of leaves of 5, and the crown width, which increased with the age of the plant, reached 9.8 cm. The fresh weight of the lettuce plants was 255 grams, and the average weight of the lettuce plants was 15.94 grams.
Co-Authors Chandra Setyawan, Chandra Joko Sumarsono Nugraheni, Yekti Sahid Susanto Sirajuddin Haji Abdullah