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<p>Incessant mica mining and improper disposal of mine waste have resulted in widespread arsenic (As) contamination in agricultural soils. Microbially augmented vermicomposting recently emerged as a promising approach to transform toxic mine waste into a nutrient-rich organic amendment, however, its field-scale adoption and validation for arsenic immobilization remain limited.&#xa0;This study evaluated the performance of vermicomposts prepared using mica mine tailings (MMT). Soil physicochemical, microbial, macronutrient, and arsenic content were measured, alongside crop yield and biochemical parameters.&#xa0;Treatment T5 [bacteria-supplemented MMT (1:1) vermicompost (50%) + NPK fertilizer (50%)] consistently outperformed all other treatments, improving soil health, crop biochemical attributes, and yield especially compared to T13 [Raw mica mine tailing (50%) + NPK fertilizer (50%)] and T14 [Raw mica mine tailing (100%)] (<i>p</i> &lt; 0.05). Rice grown with vermicompost amendments posed low dietary arsenic risk, whereas raw MMT supplementation resulted in moderate to high risk, demonstrating the safety and remediation potential of the bioaugmented compost. Random Forest analysis (grain yield MSE = 11.26, RMSE = 3.35; biomass yield MSE = 6.84, RMSE = 2.62) identified microbial biomass carbon and soil respiration as the most influential predictors of grain yield, and soil respiration and nitrogen for biomass yield, emphasizing the central role of biologically driven nutrient cycling in crop productivity.&#xa0;Overall, this study demonstrates that bioaugmented vermicomposted MMT serves as an effective soil conditioner and organic amendment, bridging laboratory innovations with field-scale application, while contributing to arsenic immobilization and improved soil quality.</p>

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Valorization of Mica Mine Waste Into Bioaugmented Vermicompost for Arsenic Mitigation and Sustainable Rice Cultivation: Integrative Field and Model-Based Assessment

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Shreya Chakraborty,
  • Sonam Jha,
  • Saibal Ghosh,
  • Sonali Banerjee,
  • Riddhi Basu,
  • Gourav Mondal,
  • Pradip Bhattacharyya

摘要

Incessant mica mining and improper disposal of mine waste have resulted in widespread arsenic (As) contamination in agricultural soils. Microbially augmented vermicomposting recently emerged as a promising approach to transform toxic mine waste into a nutrient-rich organic amendment, however, its field-scale adoption and validation for arsenic immobilization remain limited. This study evaluated the performance of vermicomposts prepared using mica mine tailings (MMT). Soil physicochemical, microbial, macronutrient, and arsenic content were measured, alongside crop yield and biochemical parameters. Treatment T5 [bacteria-supplemented MMT (1:1) vermicompost (50%) + NPK fertilizer (50%)] consistently outperformed all other treatments, improving soil health, crop biochemical attributes, and yield especially compared to T13 [Raw mica mine tailing (50%) + NPK fertilizer (50%)] and T14 [Raw mica mine tailing (100%)] (p < 0.05). Rice grown with vermicompost amendments posed low dietary arsenic risk, whereas raw MMT supplementation resulted in moderate to high risk, demonstrating the safety and remediation potential of the bioaugmented compost. Random Forest analysis (grain yield MSE = 11.26, RMSE = 3.35; biomass yield MSE = 6.84, RMSE = 2.62) identified microbial biomass carbon and soil respiration as the most influential predictors of grain yield, and soil respiration and nitrogen for biomass yield, emphasizing the central role of biologically driven nutrient cycling in crop productivity. Overall, this study demonstrates that bioaugmented vermicomposted MMT serves as an effective soil conditioner and organic amendment, bridging laboratory innovations with field-scale application, while contributing to arsenic immobilization and improved soil quality.