Santika, N.A. and Indriani, V. 2025. Optimization of vermicompost utilization of soil worms (Lumbricus rubellus) on the morphology green spinach (Amaranthus sp.). Jurnal Online Pertanian Tropik. 13, 2 (Oct. 2025), 93–102. DOI:https://doi.org/10.32734/jopt.v13i2.24549.