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Teknologi Biopriming untuk Meningkatkan Perkecambahan dan Kolonisasi Mikroba Bermanfaat pada Benih Kelapa Sawit (Elaeis guineensis) Muhammad Luqman Hakim; Hakim, Muhammad Luqman; Noor, Putri Shania; Hidayat, Arif
Buletin Anatomi dan Fisiologi Volume 10, Nomor 1, Tahun 2025
Publisher : Departemen Biologi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/baf.10.1.2025.91-101

Abstract

Biopriming merupakan teknik inovatif dalam meningkatkan daya kecambah dan kesehatan benih melalui kolonisasi mikroba menguntungkan. Penelitian ini mengevaluasi efek biopriming menggunakan konsorsium mikroba bermanfaat yang mengandung Bacillus sp., Pseudomonas sp., dan Rhizobium sp. terhadap perkecambahan dan dinamika mikroba pada benih kelapa sawit (Elaeis guineensis). Studi dilakukan menggunakan rancangan acak kelompok dua faktor dengan tiga jenis perendaman (formula NB, formula Effervescent, dan air sebagai kontrol) dan tiga varietas benih (Nirmala, Lestari, Sejahtera). Parameter yang diamati adalah populasi mikroba sebelum dan setelah benih berkecambah serta daya kecambah benih kelapa sawit. Data yang diperoleh dianalisis menggunakan metode analisis varians (ANOVA). Hasil penelitian menunjukkan bahwa biopriming meningkatkan jumlah bakteri pemfiksasi nitrogen dan pelarut fosfat sebelum dan setelah perkecambahan, yang berdampak positif terhadap daya kecambah. Varietas Nirmala dan Lestari mengalami peningkatan daya kecambah yang signifikan, sedangkan varietas Sejahtera tidak menunjukkan perbedaan berarti. Penelitian ini menegaskan bahwa biopriming mikroba berpotensi diterapkan secara luas dalam produksi benih kelapa sawit, mendukung praktik pertanian berkelanjutan. Studi lanjutan diperlukan untuk mengoptimalkan formulasi mikroba dan mengevaluasi dampak jangka panjangnya pada produktivitas tanaman. Biopriming is an innovative technique to enhance seed germination and health by promoting beneficial microbial colonization. This study evaluates the effects of biopriming using a consortium of beneficial microbes containing Bacillus sp., Pseudomonas sp., and Rhizobium sp. on germination performance and microbial dynamics in oil palm (Elaeis guineensis) seeds. A randomized complete block design with a factorial approach was applied, involving three soaking treatments (NB formula, Effervescent formula and water as a control) and three seed varieties (Nirmala, Lestari, Sejahtera). The observed parameters were the microbial population before and after seed germination, as well as the germination rate of oil palm seeds. The data obtained were analyzed using the analysis of variance (ANOVA) method. The results indicate that biopriming significantly increased the abundance of nitrogen-fixing and phosphate-solubilizing bacteria before and after germination, positively impacting seed germination rates. Nirmala and Lestari varieties exhibited significant improvements in germination, whereas Sejahtera showed no substantial difference. This study confirms that microbial biopriming holds great potential for large-scale oil palm seed production, supporting sustainable agricultural practices. Further research is required to optimize microbial formulations and assess the long-term effects on plant productivity.
Study of Rescheduling of MV Alfa Trans Satu Ship Repair Using Critical Path Method (CPM) and Project Evaluation and Review Technique (PERT) Parlindungan Manik; Rika Afrodiyanti; Muhammad Luqman Hakim
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 4 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i4.5088

Abstract

The ship repair project must work according to the schedule agreed in the work contract. However, in the process there are often delays between the initial plan and work in the field. The scheduling method is one of the influences on the success of repairs in order to produce efficient scheduling and cost planning. Based on these conditions, this study aims to obtain a new duration and the most optimal cost of crashing through an alternative, namely additional working hours (overtime hours) and additional workforce in the MV Alfa Trans Satu Ship repair project by applying the CPM and PERT methods. Based on the crash duration calculation using the CPM, the most effective and efficient alternative that can be used to accelerate the MV Alfa Trans Satu Ship repair project is by adding a workforce of 32 Person (an increase of 30% from the initial workforce). This acceleration alternative produces a duration below the normal duration, 21 days from the initial 25 days. The probability of success for this project using the PERT method can be completed within 21 days of 98.46%. The percentage increase in costs is only 4% of the normal for critical work, IDR 50,800,000.
Analysis Of Magnus Effect Toward The Shaft Of Vetical Axis Hydro Turbine H-Darrieus Rizki Aulia Chandra Putera; Muhammad Luqman Hakim; Untung Budiarto; Samuel
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 4 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i4.5092

Abstract

Nowaday, at least 80% of the world's cargo is shipped via marine transportation modes, so with the amount of shipping activity, the shipping industry produces air pollution of at least 3.3% of global carbon dioxide emissions. The problem is trying to be answered by reducing a fuel use, one of which is through drag reduction. It is estimated that at least 80-90% of the drag that occurs on VLCC (Very Large Crude Carrier), comes from frictional drag that occurs on the surface of the hull. One of method to reducing frictional drag is by applying a hydrophobic coating. The hydrophobic coating has molecular physical properties to repel water. Similar as the water on a lotus leaf that can’t wet the leaves even a little, this phenomenon is called the Hydrophobic effect. Applying the hydrophobic coating on the specimen is done by spraying hydrophobic coating paint. As It seen from the contact angle with value above 900 shows the hydrophobic effect on the coated surface. This research aims to prove whether the application of hydrophobic coating on the hull specimen would give a significant effect such as buoyancy increase and drag reduction characteristics. The research method used is the experimental method by pulling the ship model utilizing the free fall of the load mass to provide a pulling force to the ship model and hydrophobic evaluation of the surface. The experiment was carried out in the Diponegoro University’s hydrodynamics lab with the assumption that the increase in acceleration is a drag reduction. From the test results, it was found that the drag reduction value has a percentage above 25% with the use of light mass variations. In the experiment, there is phenomenon of buoyancy increase characteristic appeared after the appliance of hydrophobic coating.