Soil degradation driven by excessive inorganic fertilizer use and conventional cultivation practices has reduced land productivity in tropical regions, including Indonesia. This study developed biological pellet-based planting media to improve soil physical, chemical, and biological properties while providing controlled nutrient release. The research employed a panel design and split-plot layout on sandy Entisol soils, evaluating physical\u2013chemical characteristics, rhizosphere microbial colonization, and nutrient-release kinetics using the Gompertz model. The results show that pellets increased soil porosity up to 56%, extended water retention to 22 hours, and significantly enhanced organic carbon as well as N, P, K, Ca, and Mg levels compared with the control. Nutrient release followed a lag\u2013exponential\u2013plateau pattern, indicating an efficient gradual-release mechanism. Microbial and soil-fauna activity more than doubled, demonstrating restored biological functioning of the soil. Treatments with a balanced organic\u2013inorganic ratio (50:50) exhibited the best overall performance across all parameters. Overall, pellet-based planting media prove effective as multifunctional soil conditioners that enhance fertility, nutrient efficiency, and agroecosystem sustainability in marginal tropical soils.<\/p>\n