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All Journal HAYATI Journal of Biosciences Devotion: Journal of Research and Community Service
Dewangga, Rezha Tanu
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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Comparing Effectiveness of Hand Pollination, Wild Insects and Local Stingless Bees (Tetragonula laeviceps) for Pollination of Exotic Mauritius Raspberry (Rubus rosifolius) Putra, Ramadhani; Dewangga, Rezha Tanu; Hermawan, Endang; Kinasih, Ida; Raffiudin, Rika; Soesilohadi, RC Hidayat; Purnobasuki, Hery
HAYATI Journal of Biosciences Vol. 31 No. 6 (2024): November 2024
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.31.6.1050-1060

Abstract

Mauritius raspberry (Rubus rosifolius) is an exotic plant cultivated in Indonesia. Studies showed that the productivity of exotic plants is reducing due to a lack of pollination agent for their origin region. Several methods could be applied to overcome this problem. The study aimed to find the most effective method for pollinating this plant among four pollination regimes: Self-pollination, wild insects, stingless bees (Tetragonula laeviceps), and hand-pollination. The observation was conducted on the insect pollinators' activities (visitation rate, flower constancy, and flower handling time), pollination efficiency, and quality of the fruits produced (fruit volume). The results showed a higher visitation rate (10 to 70 per hour), higher flower constancy (visited from 07.00 to 16.00), and longer flower handling time (13.6 s) of T. laeviceps on raspberry flowers than other insects. High activities related to better raspberry pollination success (96%) and bigger fruits produced. Based on this study, applying stingless bees as pollination agents for exotic plants was the best and potentially applicable to other exotic crops.
Value Engineering Of Modern Formwork In Multi-Story Building Construction Case Study On The Construction Project Of The Brin Building Complex In Yogyakarta Dewangga, Rezha Tanu; Suryani, Fitri; Nurjaman, Hari Nugraha; Dinariana, Dwi
Devotion : Journal of Research and Community Service Vol. 5 No. 2 (2024): Devotion: Journal of Research and Community Service
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/devotion.v5i2.677

Abstract

Reinforced concrete is the most commonly used construction material in building construction in the 21st century. In its production, supportive instruments are needed to enhance both quality and economic aspects. Formwork, or shuttering, is a crucial factor in the casting and hardening of concrete. The subject of this research is wooden formwork and its alternatives, analyzed in terms of cost, quality, time, and convenience using the Value Engineering Job Plan analysis. In terms of cost, there is a cost savings of 8.88% for DUO polymer formwork compared to the conventional plywood method. The resulting surface quality of the concrete of this method has a average roughness of 3.492. The total duration of the work is 16.54791 days. The total value index obtained for the use of DUO polymer formwork is 98.99, for the plywood film formwork is 48.17, and for conventional plywood formwork is 0.00. Thus, in terms of value, the DUO polymer plastic formwork can be recommended as the best formwork method for multi-story building construction. Considering the advantages and disadvantages of this method, along with the benefits obtained, it would be even more beneficial on a larger construction scale.
Co-Authors Dinariana, Dwi Fitri Suryani Hermawan, Endang Hery Purnobasuki Ida Kinasih Nurjaman, Hari Nugraha Putra, Ramadhani R.C. Hidayat Soesilohadi RIKA RAFFIUDIN