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<p>This study investigates the bioconversion of lignocellulosic vegetable waste into a nutrient-rich organic amendment using the indigenous earthworm <i>Metaphire nanaoensis</i>. A mixture of vegetable waste and cow dung (1:1 ratio) underwent 20&#xa0;days of pre-decomposition, followed by 60&#xa0;days of vermicomposting. The final vermicompost was evaluated against traditional compost (control) based on physicochemical and biological parameters. Results revealed a significant increase in total nitrogen, phosphorus, potassium, calcium, zinc, magnesium and sulfur in the vermicompost, alongside a reduction in total organic carbon, pH and C/N ratio. Microbial populations, including nitrogen-fixing bacteria, phosphate-solubilizing bacteria and potassium-solubilizing bacteria were elevated by 2.5-fold, threefold and 2.2-fold, respectively, compared to the control. Scanning electron microscopy showed a disorganized, porous and fine-textured structure in the vermicompost. The findings highlight vermicomposting as a sustainable, zero-waste approach for converting organic residues into value-added biofertilizers.</p>

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Bioconversion of organic waste into compost using Metaphire nanaoensis

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Hunmily Hansepi,
  • Sweta Sruti Bora,
  • Pinky Bora,
  • N. Nirjanta Devi,
  • Ajanita Mazumdar

摘要

This study investigates the bioconversion of lignocellulosic vegetable waste into a nutrient-rich organic amendment using the indigenous earthworm Metaphire nanaoensis. A mixture of vegetable waste and cow dung (1:1 ratio) underwent 20 days of pre-decomposition, followed by 60 days of vermicomposting. The final vermicompost was evaluated against traditional compost (control) based on physicochemical and biological parameters. Results revealed a significant increase in total nitrogen, phosphorus, potassium, calcium, zinc, magnesium and sulfur in the vermicompost, alongside a reduction in total organic carbon, pH and C/N ratio. Microbial populations, including nitrogen-fixing bacteria, phosphate-solubilizing bacteria and potassium-solubilizing bacteria were elevated by 2.5-fold, threefold and 2.2-fold, respectively, compared to the control. Scanning electron microscopy showed a disorganized, porous and fine-textured structure in the vermicompost. The findings highlight vermicomposting as a sustainable, zero-waste approach for converting organic residues into value-added biofertilizers.