Evaluation of the Biological and Chemical Stability of Different Composts as Inoculum in Aerobic Biodegradation Tests In Press
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Abstract
The biological and chemical stability of compost is essential in biodegradation tests for plastic materials. This study evaluated the biological and chemical stability of three composts with different compositions and origins: Finca La Rejoya, Granja Integral Mamá Lombriz, and a commercial compost (Abonisa). Biological stability was assessed through a germination test using native corn seeds, tolerance tests with wheat seedlings (evaluating seed yield, plant height, root length, and chlorophyll index), and quantification of carbon dioxide (CO?) production. Chemical stability was analyzed by measuring total organic carbon (TOC), nitrogen content, carbon/nitrogen (C/N) ratio, total solids (TS), volatile solids (VS), and pH. The results revealed statistically significant differences among the composts. The compost from Finca La Rejoya exhibited optimal conditions, with a germination rate of 88.89%, a seed yield of 95.74%, the highest chlorophyll index (1.83), the lowest CO? production (150.26 mL after 48 hours), a C/N ratio of 13.36, and a pH of 7.11. This study emphasizes the importance of evaluating compost stability before using it in aerobic biodegradation tests and concludes that the compost from Finca La Rejoya is the most suitable as an inoculum for such applications
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