Abstract
Vermicompost is a promising nutrient-rich organic fertilizer and soil conditioner. The maturity of vermicompost is highly important to ensure a proper quality of vermicompost. In this study, different indices to measure the compost maturity, such as carbon to nitrogen ratio (C:N ratio), carbon dioxide evolution rate, and ammonium to nitrate ratio, were tested. According to the California compost quality council process, tests were carried out for different sample data of vermicomposting as a function of composting time, moisture content, and initial C:N ratio. The composting time and initial C:N ratio were found to be significant influencing factors. The second-order polynomial models obtained using a response surface methodology were employed to explain the responses of the maturity indices according to changes in the vermicomposting factors. Composting should be conducted at an initial C:N ratio of 33.09 and a moisture content of 50.66% for 28.35 days to produce highly mature vermicompost.
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