Fitriah, F. and Saleha, S. 2025. Effect of Fermentation Duration on the Carbon-to-Nitrogen (C/N) Ratio of Liquid Organic Fertilizer Produced from Dami Jackfruit Waste Using Coconut Husk-Based Bioactivator. Cognitia : International Engineering Journal. 1, 1 (Apr. 2025), 18–25. DOI:https://doi.org/10.63288/ciej.v1i1.3.