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<p>Nickel (Ni) accumulation in agricultural soils from prolonged wastewater irrigation poses serious risks to crop productivity, while also contaminating food chain, endangering global food security and public health. This study assessed the potential of agro-residue-based amendments such as rice husk ash (RHA) and sugarcane bagasse ash (SBA) in mitigating Ni toxicity and enhancing the growth, yield and metabolites of two wheat cultivars (<i>Triticum aestivum</i> L. cv. HUW 234; HUW 510) under tropical field conditions in India. Experiments were conducted using Ni-contaminated soil with 4% RHA (T<sub>2</sub>) and 4% SBA (T<sub>3</sub>), compared to untreated Ni-contaminated soil (T<sub>1</sub>) and a non-contaminated control (C). Elevated Ni levels substantially (<i>p</i> ≤ 0.05) diminished plant growth and yield while augmenting Ni bioaccumulation. RHA and SBA reduced Ni accumulation by 57–64% and 63–70% in non-edible parts, and by 45–49% and 76–93% in edible parts, respectively. Plant height increased by 18–39% (vegetative) and 40–52% (reproductive), and grain yield improved by 21–28% and 17–33% across treatments. The values of bioaccumulation factor (BAF) and translocation factor (TF) showed a notable decline by 37–42% and 31–33% with RHA, and by 48–54% and 43–47% with SBA. Health risk assessment was performed using multiple indices, including BAF, TF, EDI, HQ, and LTCR, confirmed Ni levels in grains were within safe limits. SBA revealved more effective than RHA in reducing Ni accumulation and enhancing wheat performance, underscoring their potential as sustainable, cost-effective amendments for Ni-contaminated soils to secure food safety and productivity.</p>

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Agro-waste amendments alleviate nickel stress: insights into growth, physiology, metabolites, bioaccumulation and health risk assessment in wheat under tropical ecosystems

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Umesh Kumar,
  • Prince Kumar Singh,
  • Indrajeet Kumar,
  • Rajesh Kumar Sharma

摘要

Nickel (Ni) accumulation in agricultural soils from prolonged wastewater irrigation poses serious risks to crop productivity, while also contaminating food chain, endangering global food security and public health. This study assessed the potential of agro-residue-based amendments such as rice husk ash (RHA) and sugarcane bagasse ash (SBA) in mitigating Ni toxicity and enhancing the growth, yield and metabolites of two wheat cultivars (Triticum aestivum L. cv. HUW 234; HUW 510) under tropical field conditions in India. Experiments were conducted using Ni-contaminated soil with 4% RHA (T2) and 4% SBA (T3), compared to untreated Ni-contaminated soil (T1) and a non-contaminated control (C). Elevated Ni levels substantially (p ≤ 0.05) diminished plant growth and yield while augmenting Ni bioaccumulation. RHA and SBA reduced Ni accumulation by 57–64% and 63–70% in non-edible parts, and by 45–49% and 76–93% in edible parts, respectively. Plant height increased by 18–39% (vegetative) and 40–52% (reproductive), and grain yield improved by 21–28% and 17–33% across treatments. The values of bioaccumulation factor (BAF) and translocation factor (TF) showed a notable decline by 37–42% and 31–33% with RHA, and by 48–54% and 43–47% with SBA. Health risk assessment was performed using multiple indices, including BAF, TF, EDI, HQ, and LTCR, confirmed Ni levels in grains were within safe limits. SBA revealved more effective than RHA in reducing Ni accumulation and enhancing wheat performance, underscoring their potential as sustainable, cost-effective amendments for Ni-contaminated soils to secure food safety and productivity.