Continuous use of chemical fertilizers to increase productivity often causes disruption to essential soil nutrients and environmental degradation and adversely affects soil rhizosphere microorganisms. This study aimed to determine the efficacy of the joint application of Trichoderma asperellum and biochar for increasing rice productivity using the SRI method and for improving the quality of paddy fields. This study consisted of eight treatments: T0BC (standard application of NPK without Trichoderma asperellum and biochar), T1BG (Trichoderma asperellum + NPK), T2BC (husk biochar + NPK), T3BC (coconut shell biochar + NPK), T4BC (mangrove biochar mangove + NPK), T5BG (Trichoderma asperellum + husk biochar + NPK), T6BC (Trichoderma asperellum + coconut shell biochar + NPK), and T7BC (Trichoderma asperellum + mangrove biochar + NPK). A randomized block research design was applied with three replications. Observations were conducted on plant height, number of tillers, leaf area index, number of panicles, number of pithy grains, number of empty grains, yield per pot, yield per hectare, and soil nutrient. The results showed that the application of a combination of Trichoderma asperellum and positive biochar increased the observed growth and yields 55.31% higher than the full dose of inorganic fertilizer. Combined application also increased pH, total N, available P, and Kdd, thereby increasing the nutrient content of paddy fields. Collectively, Trichoderma asperellum and biochar increased soil fertility and nutrient absorption, and encouraging the growth of Trichoderma asperellum increased the population in the rhizosphere.