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All Journal Jurnal Biologi Tropis Abdimas : Jurnal Pengabdian Kepada Masyarakat Journal of Comprehensive Science Indonesian Biodiversity Journal Quagga: Jurnal Pendidikan dan Biologi Indonesian Biodiversity Journal PESHUM Advances in Tropical Biodiversity and Environmental Sciences
Utari Satiman
Universitas Negeri Manado
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Medicine & Pharmacology Neuroscience Public Health Social Sciences Veterinary Other

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Analysis of Weed Diversity, Density and Dominance on Rice Plants in Minahasa, South Minahasa, North Minahasa, and Tomohon Regency Tirza Selfin Korneles; Orbanus Naharia; Utari Satiman; Marthy Lingkan Stella Taulu; Sukmarayu Pieter Gedoan
Advances in Tropical Biodiversity and Environmental Sciences Vol. 9 No. 1 (2025): February 2025: Pages 1-66
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2025.v09.i01.p04

Abstract

This study investigates the diversity of weeds in rice plants across Minahasa, South Minahasa, North Minahasa, and Tomohon regency, focusing on the environmental factors influencing the distribution and density of weeds. The research highlights that the diversity of weeds is significantly influenced by environmental factors such as rainfall, soil type, and water management practices applied by farmers. Species such as Marsilea crenata and Panicum disticum dominate areas with poor drainage, while Ludwigia hexandra and Fimbristylis litoralis thrive in fields with better drainage. Observations of weed density at 21 and 42 days after planting revealed that the competition between paddy and weeds changes as the paddy plants mature, with the initial dominance of weeds decreasing as the paddy plants grow stronger. The findings provide valuable insights into weed dynamics and the significant role environmental conditions play in determining their distribution. These results offer guidance for developing more effective and environmentally sustainable weed management strategies. Recommendations include selective herbicide use, mechanical soil cultivation, crop rotation, and improved water management. The study also suggests that further research is needed to assess the impact of climate change on weed diversity and the long-term effectiveness of weed management practices.
Penerapan Model Pembelajaran Problem Based Learning Untuk Meningkatkan Hasil Belajar IPA Siswa Kelas IX C di SMP Negeri 6 Langowan Sukmarayu P Gedoan; Farlen Arlandi Winokan; Utari Satiman; Marthy LS Taulu
PESHUM : Jurnal Pendidikan, Sosial dan Humaniora Vol. 5 No. 4: Juni 2026
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/peshum.v5i4.18141

Abstract

Latar belakang penelitian ini adalah rendahnya hasil belajar siswa pada mata pelajaran IPA. Berdasarkan hasil observasi serta wawancara di SMP Negeri 6 Langowan, pembelajaran di kelas hanya berlangsung satu arah, siswa kurang memperhatikan pelajaran, dan siswa dominan hanya mencatat materi. Penelitian ini bertujuan untuk meningkatkan hasil belajar siswa kelas IX C SMP Negeri 6 Langowan melalui penerapan model pembelajaran PBL khususnya pada materi sistem perkembangbiakan tumbuhan. Penelitian ini menggunakan jenis penelitian tindakan kelas (PTK). Penelitian ini dilaksanakan di kelas IX C SMP Negeri 6 Langowan yang berjumlah 25 siswa. Hasil penelitian siklus I menunjukkan 7 siswa tuntas dengan persentase 28% dan 18 siswa tidak tuntas dengan persentase 72%. Pada pelaksanaan siklus II, 24 siswa tuntas dengan persentase 96% sedangkan 1 siswa tidak tuntas dengan persentase 4%. Kesimpulan penelitian ini bahwa penerapan model pembelajaran problem based learning mampu meningkatkan hasil belajar IPA di kelas IX C SMP Negeri 6 Langowan materi sistem perkembangbiakan tumbuhan.
The Role of Riparian Vegetation in Pollutant Filtration and Sediment Stabilization in Lake Tondano, Indonesia Wiesye Nangoy; Gerry Harindah; Rievo Djarang; Utari Satiman
Quagga: Jurnal Pendidikan dan Biologi Vol 18 No 2 (2026): QUAGGA : Jurnal Pendidikan dan Biologi
Publisher : Program Studi Pendidikan Biologi, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kuningan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25134/quagga.v18i2.527

Abstract

Riparian vegetation plays a crucial role in maintaining aquatic ecosystem stability by acting as a natural buffer against anthropogenic pollution and erosion. This study analyzed the composition, structure, and ecological functions of riparian vegetation in Lake Tondano, North Sulawesi, Indonesia, with emphasis on pollutant filtration and sediment stabilization. Field surveys were conducted from May to August 2025 at ten riparian stations surrounding Lake Tondano (4,638 ha). Vegetation sampling used a stratified line transect method with fifty plots of varying sizes according to vegetation strata. Quantitative analysis included relative abundance, frequency, dominance, Importance Value Index (IVI), and the Shannon–Wiener diversity index (H’). Ecological functions were assessed through correlations between vegetation structure and reported nutrient and sediment reduction efficiencies from tropical riparian studies. A total of fifteen dominant riparian species were identified, mainly from the families Poaceae and Cyperaceae. Cyperus papyrus (IVI = 21.81%) and Metroxylon sagu (IVI = 29.65%) functioned as key ecological species, while Ficus septica showed the highest IVI (90.83%), indicating strong structural dominance. The Shannon–Wiener diversity index (H’ = 2.65) reflects moderate to high diversity. Riparian vegetation was estimated to reduce nutrient loads by 40–60% and erosion by 30–50%, highlighting its importance for ecosystem-based lake management.
The Effect of Glycerol on the Production of Environmentally Friendly Bioplastics From Cassava Peel (Manihot Esculenta) and Corn Cobs (Zea Mays) Merliana Christmas Turangan; Helen Joan Lawalata; Utari Satiman; Rievo Handry Djarang
Journal of Comprehensive Science Vol. 5 No. 2 (2026): Journal of Comprehensive Science
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jcs.v5i2.4009

Abstract

Conventional plastics made from synthetic polymers have a low biodegradation rate, which contributes greatly to environmental pollution. The use of agricultural waste such as cassava husks (Manihot esculenta) and corn cobs (Zea mays) as bioplastic raw materials is one of the alternatives for the development of environmentally friendly materials. This study aims to determine the effect of variations in the amount of glycerol and the length of decomposition time on the biodegradability of bioplastics made from cassava husks and corn cobs. The study used an experimental method with a Two-Way Factorial Design, covering three concentrations of glycerol (0 mL, 15 mL, and 30 mL) and three decomposition times (3, 6, and 9 days). The results showed that the treatment without glycerol (0 mL) did not form bioplastics so it could not be analyzed. The data was tested using Two Way ANOVA. The results of the biodegradability test showed that the glycerol concentration had a significant effect, and the 30 mL formulation resulted in the highest degradation rate of 91.026% on day 9.
Co-Authors Arrijani - Aser Yalindua Billy Sampelan Christny Ferdina Evie Rompas Dewi Mellaninyanto Farlen Arlandi Winokan Gerry Harindah Gulbudin Hikmatiar Idris Helen Joan Lawalata Hotni Doani Purba Jefry Jack Mamangkey Jefry Jack Mamangkey Marthy L S Taulu Marthy Lingkan Stella Taulu Marthy LS Taulu Merliana Christmas Turangan Orbanus Naharia Orbanus Naharia Rievo Djarang Rievo Handry Djarang Stella Taulu Sukmarayu P. Gedoan Sukmarayu Pieter Gedoan Tirza Selfin Korneles Wantania, Johanna Zusye Wiesye Nangoy