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Dwi Erwin Kusbianto
Universitas Jember
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Nursing Physics Public Health Social Sciences Veterinary Other

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Journal : Biospecies

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Pengaruh Jenis Ekstrak Dan Beberapa Variasi Konsentrasi Zat Alelopati Alami Dalam Menghambat Perkecambahan Benih Dan Pertumbuhan Bibit Kakao (Theobroma cacao L.) Widiono, Fajar Kurnia Maulid; Kusbianto, Dwi Erwin; Arum, Ayu Puspita; Setiyono
Biospecies Vol. 19 No. 1 (2026): Januari 2026 (In press)
Publisher : Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/biospecies.v19i1.41173

Abstract

Cocoa is a strategic plantation commodity that contributes significantly to export-import activities, increasing the country's foreign exchange. However, the distribution of cocoa seeds is faced with the problem of recalcitrant seeds, which can be overcome by using natural allelopathic substances. Natural allelopathic plant extracts contain toxic compounds such as alkaloids, phenolics, and terpenoids which are effective in inhibiting germination. The purpose of this study was to determine the effect of the type of extract and the concentration of natural allelopathic substances in inhibiting the process of seed germination and growth of cocoa seedlings. This study used a factorial Completely Randomized Design (CRD). The first factor was the type of extract, namely cogongrass roots and tomato leaves. The second factor was the concentration of natural allelopathic substances, namely control, 4%, 6%, and 8%. Data were analyzed using the ANOVA (Analysis of Variance) test. If there was a significant difference between treatments, further testing was carried out using Duncan's multiple range test at the 5% level. The results of the study showed (1) the interaction between the type of extract and the concentration of natural allelopathic substances had a significant effect on the observed variables of germination power, vigor index, lethal concentration (LC50), plant growth rate, and number of leaves, with the best treatment being the cogongrass root extract at a concentration of 4%. (2) The effect of the type of natural allelopathic extract had a significant effect on the parameters of vigor index, plant growth rate, number of leaves, and stem diameter. (3) The effect of the concentration of natural allelopathic substances had no significant effect on any of the observed variables.  
Co-Authors Aji Santoso Ardyansah, Muhammad Ikrom Arum, Ayu Puspita Az-Zahra, Rana Bakhroini Habriantono Bambang Kusmanadhi Budiman, Subhan Arif Cahya, Dita Wulan Dinata, Ferry Djoko Soejono Dyah Ayu Savitri Ebban Bagus Kuntadi Eistifani Fajrin Emiyati, Sri Firdaus, Satria Wahyu Ramadhan Gatot Subroto Haliza, Nurhayadatul Hasanah, Rizky Hasbi Mubarak Suud Hasbi Mubarok Suud, Hasbi Mubarok Himmatul Khasanah Ibanah, Indah Ika Purnamasari Irsyadi, Muhammad Burhanuddin Jadmiko, Wildan Khozin, Mohammad Nur Laksono Trisnantoro Laras Sekar Arum Linda Ayu Islamia Listya Purnamasari listya purnamasari Mohammad Ghufron Rosyadi Muhammad Dima Say Mona Musa, Adam Muhammad Ibrahim Nisak, Fauziatun Nur Widodo Oria Alit Farisi Prabowo, Rachmad Udhi Pramesti, Riska Ayu Prayoga, Mohammad Candra Purnaning Dhian Isnaeni Putrika Suryandari Ramadani, Prayogo Gilang Randi Wijaya Pangestu Rena Yunita Rahman, Rena Yunita Restanto, Didik Pudji Risa Umami Rokhani Rokhani Rondhi, M Roni Yulianto Rony, Zahara Tussoleha Rosyady, Mohammad Ghufron Rosyady, Muhammad Ghufron Rosyady, Muhammad Gufron Rusdiana, Riza Yuli S, Setiyono Setiawati, Tri Candra setiyono Setiyono Setiyono Setiyono Setiyono Setiyono Setiyono Shafira, Firyal Eka Putri Sholeh Avivi Sigit Soeparjono Slameto Slameto Slameto Slameto Subroto, Gatot Sugeng Santoso Suud, Hasbi Mubarak Su’ud, Hasbi Mubarak Tyas, Iswahyuning Wahyu Budi Utomo Widianingrum, Desy Cahya Widiono, Fajar Kurnia Maulid Wildan Muhlison, Wildan Wulanjari, Distiana Yuli Hariyati Zahrosa, Dimas Bastara