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All Journal Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Relevansi : Ekonomi, Manajemen dan Bisnis
Samsul Bakri
University of Lampung
Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Social Sciences

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Growth Improvement of Palm Oil Seedling using Biochar from Oil Palm Empty Fruit Bunch and Rubber Wood Seldi Prayoga; Melya Riniarti; Hendra Prasetia; Kukuh Setiawan; Samsul Bakri; Wahyu Hidayat
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 6 (2025): December 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v14i6.2179-2186

Abstract

Agricultural wastes biochar can be used to support the growth of oil palm seedlings. This study aims to assess the effectiveness of biochar pellets made from oil palm empty fruit bunches (OPEFB) and rubber wood wastes on the growth of oil palm seedlings. The research was conducted in the greenhouse using a factorial complete randomized design with two treatment factors, namely the type of biochar pellets (OPEFB and rubber wood) and doses of 0%, 5%, 10% with 10 replications. Observation included plant height, stem diameter, number of leaves, and total dry weight. The results showed that biochar pellet application had a significant effect on plant growth, especially at a 10% dose, which increased plant height, stem diameter, number of leaves, and dry weight compared with the control. The 10% dose of OPEFB biochar pellet produced a plant height of 21.4 cm, stem diameter of 3.64 cm, and number of leaves of 8 strands, while the same dose of rubber wood biochar pellet produced a height of 15.67 cm, diameter of 3.64 cm, and number of leaves of 6.67 strands. OPEFB biochar pellet showed higher results than rubber wood biochar, but at the same dose, the difference is minor. These results indicate that biochar pellets from agricultural waste have the potential to effectively support the growth of oil palm seedlings in an environmentally friendly manner.
Competency Certification and Environmental Education as Predictors of Hazardous Waste Compliance among FPSO Workers Budiman Oenyi; Rinawati; Tugiono; Samsul Bakri; Gregorius Nugroho Susanto; Agafirdus Irvandus Blutuk
Jurnal Relevansi : Ekonomi, Manajemen dan Bisnis Vol 10 No 1 (2026): Jurnal Relevansi: Ekonomi, Manajemen dan Bisnis
Publisher : LPPM STIE KRAKATAU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61401/relevansi.v10i1.428

Abstract

Hazardous waste management on Floating Production, Storage, And Offloading (FPSO) vessels is a critical issue owing to strict regulations, operational isolation, and limited storage capacity. This study examined whether demographic, human capital, and organizational factors influence employee compliance in FPSO in Indonesian waters. A cross-sectional survey and structured observation were conducted among 90 workers, and the data were analyzed using ordinal logistic regression. The results show that competency certification significantly predicts compliance (OR=0.06, p=0.044), while environmental education has a marginal effect (OR=0.10, p=0.086). The other factors were not significant. These findings indicate that certification and environmental learning are more influential than demographic or job-related factors are. This study contributes to the offshore Health, Safety, and Environment (HSE) literature by extending human capital theory on compliance behavior. Practically, this emphasizes the need to strengthen certification and environmental training. However, limitations include the single-site, cross-sectional design and potential response bias, which may limit generalizability.
Co-Authors Agafirdus Irvandus Blutuk Budiman Oenyi Gregorius Nugroho Susanto Hendra Prasetia Kukuh Setiawan Melya Riniarti Rinawati Seldi Prayoga Tugiono Wahyu Hidayat