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Orbanus Naharia
Universitas Negeri Manado
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Journal : Journal of Innovative and Creativity

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Weed Vegetation Analysis in Lowland Rice Cultivation in South Minahasa Regency Orbanus Naharia
Journal of Innovative and Creativity Vol. 5 No. 3 (2025)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v5i3.5580

Abstract

Goal. This study aims to analyze the composition, dominance structure, and temporal changes of weed vegetation in lowland rice cultivation in South Minahasa Regency. The research specifically seeks to identify dominant weed species at the initial observation, 21 days after sowing (DAS), 45 DAS, and 60 DAS, as a basis for determining appropriate weed management strategies during the rice growth cycle. aterials and methods. Weed vegetation analysis was conducted using the parameters of Absolute Density (AD), Relative Density (RD), Absolute Frequency (AF), Relative Frequency (RF), Absolute Dry Weight (ADW), and Relative Dry Weight (RDW). These values were integrated to obtain the Species Dominance Ratio (SDR) at four observation stages. Weed sampling was carried out using standard quadrat methods, and dry weight was determined after oven-drying samples at 80°C for 72 hours. The results showed that weed composition changed dynamically across growth phases. At the initial observation, the highest SDR values were recorded for Paspalum distichum, Marsilea crenata, Fimbristylis litoralis, Cyperus iria, and Ludwigia octovalvis. At 21 DAS, dominant weeds were P. distichum, Leersia hexandra, M. crenata, and Echinochloa crus-galli. At 45 DAS, P. distichum, E. crus-galli, L. octovalvis, and L. hexandra maintained dominance, while at 60 DAS, E. crus-galli became the most dominant species, followed by L. octovalvis, Limnocharis flava, and P. distichum. Overall, grass-type weeds showed consistently high RD, RF, and RDW values, indicating strong competitive ability throughout the rice growth cycle. The findings confirm that weed dominance in lowland rice is strongly influenced by crop growth stage, canopy development, and the competitive traits of individual weed species. Grass weeds, particularly E. crus-galli and P. distichum, demonstrate high adaptability and resource-use efficiency, making them persistent competitors in rice ecosystems. These findings reinforce the need for timely and stage-specific weed management interventions, especially during the critical period of 3–8 weeks after planting, to prevent significant yield loss and to support sustainable rice production in South Minahasa Regency.
Co-Authors Anatje Lihiang Angelica M., Grace Arianti Masanggelo Arin Makasa Aring, Ridel D. Aser Yalindua Benny B. Binilang Bricita Regina Warangkiran Burhan, Harris Carolin Manuahe Danny A Masinambow Danny Christian Posumah Daud, Putri Deisye Supit Dewa Nyoman Oka Dewi Mellaninyanto Ebe, Lord Steward Elni Usoh Emma M Moko Enjel Larega F.J.A Oentoe Fanny Nella Nanlohy Ferencia Esananda Rattu Ferni Margo Tumbel Feydina Tewu Friska F. Liando Gabriel Gloria Lumentut Gedoan, Sukmarayu Piter Genade Kojongian Gilly Marlya Tiwow H. Taunaumang Harris Burhan Heidi Kristian Repi Helen J Lawalata Helen Joan Lawalata Herry Maurits Sumampouw Hiskia Kamang Manggopa IRIANI SETYAWATI Jantje Ngangi Jelita Nainggolan Johan Reimon Batmetan Jolie Ponamon Junita A. Tumurang Lazar, Noviana Listriyanti Palangda Livana Dethris Rawung M Sri Saeni M Sri Saeni Makalew, Evaristus Mamuaja, Marlin Penina Mandey, Larry Mariana Rengkuan Martenci Yawandare Marthy L S Taulu Masye Wurarah Meisa Tabita Rogahang Meity Nelltje Tanor Meity Neltje Tanor Michael Rionaldi Gumolung Mokosuli Yermia Samuel Monoarfa, Haris Mozes Markus Wullur Naflia F. I. Pratasik Nonny Manampiring parabelem tinno dolf rompas Paulus L. Leu Peggy Veronica Togas Pikson Lenggetio Rafyansa Papunas Rahardiyan, Dino Rasmita Sabtu Mita Riviani Yubelin Rompas Rolly Robert Oroh Rompas, Heroike D. Rotty, Viktory Nicodemus Joufree Rumagit, Selvie Serly Sabihan, Supiandi Sakul, Ernest Hanny Shelty D. M. Sumual Sibala, Henike Supiandi Sabihan Suzan N H Jacobus Tambajong, Jeanever Timbuleng, Nobel Utari Satiman Walukow, Maria R. Welong, Krety Debora Wiesye Nangoy Zusye Warouw