Effect of Local Trichoderma asperellum and Trichoderma virens Strains on Composting Dynamics and Chemical Quality of Compost

Abstract

This study evaluates the effect of inoculation with local strains of Trichoderma asperellum and T. virens on the chemical quality of compost. Aerobic composting with two treatments, each repeated three times, was carried out. These treatments were: T1 (control) and T2 (inoculated treatment). The results show that inoculation significantly altered the process. Compost T2 reached a more intense (up to 58°C) and prolonged thermophilic phase (p=0.019), ensuring better sanitization. Its final pH was significantly higher (7.6 vs. 7.31; p=0.0076). Its final electrical conductivity was also significantly higher (3.97 vs. 3.17 mS/cm; p<0.001). Although its final organic matter content (45.27% vs. 48.5%; p < 0.001) and its C/N ratio (14.83 vs. 18.83; p < 0.001) were significantly lower, indicating more advanced mineralization, the nutrient levels were significantly improved: total nitrogen (1.78% vs. 1.51%; p = 0.049), phosphorus (0.75% vs. 0.51%; p = 0.002), and potassium (0.90% vs. 0.77%; p = 0.022). The study concludes that inoculation with Trichoderma accelerates maturation and produces compost with better fertilizing value, offering a promising solution for sustainable organic fertilization.