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<p>The widespread practice of manure fertilization in arid farmlands raises concerns about antibiotic pollution; however, its impact on antibiotic adsorption in alkaline soils remains poorly understood. This study investigates how chicken manure amendments change the environmental fate of ciprofloxacin (CIP) in semiarid alkaline soils. Through batch experiments conducted under varying pH, ionic strength, and manure application levels, it was found that manure addition significantly enhanced CIP retention, with the distribution coefficient (Kd) increased by 108% from 183 to 381 L/kg. This enhancement is attributed to mechanisms such as hydrogen bonding and hydrophobic interactions. Desorption hysteresis was also observed to increase by 16%, indicating more stable binding and reduced leaching potential. Importantly, the suppressive effect of competing cations (e.g., Ca<sup>2+</sup> and Mg<sup>2+</sup>) was buffered by manure-derived organic matter; under unamended conditions, adsorption was reduced by up to ninefold. Based on these findings, manure application at 3–5% (w/w) is projected to reduce CIP mobility by over 30%, offering a practical strategy to mitigate groundwater contamination risks. This study provides a theoretical foundation for developing manure management practices that minimize antibiotic leaching, thereby supporting the groundwater quality protection and sustainable agricultural production.</p>

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Synergistic effects of organic fertilizer on ciprofloxacin retention in semiarid alkaline soils

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Yufeng Jiang,
  • Wenjing Wang,
  • Xiqin Liu,
  • Weicheng Kong,
  • Longmiao Yuan,
  • Yingqin Wu

摘要

The widespread practice of manure fertilization in arid farmlands raises concerns about antibiotic pollution; however, its impact on antibiotic adsorption in alkaline soils remains poorly understood. This study investigates how chicken manure amendments change the environmental fate of ciprofloxacin (CIP) in semiarid alkaline soils. Through batch experiments conducted under varying pH, ionic strength, and manure application levels, it was found that manure addition significantly enhanced CIP retention, with the distribution coefficient (Kd) increased by 108% from 183 to 381 L/kg. This enhancement is attributed to mechanisms such as hydrogen bonding and hydrophobic interactions. Desorption hysteresis was also observed to increase by 16%, indicating more stable binding and reduced leaching potential. Importantly, the suppressive effect of competing cations (e.g., Ca2+ and Mg2+) was buffered by manure-derived organic matter; under unamended conditions, adsorption was reduced by up to ninefold. Based on these findings, manure application at 3–5% (w/w) is projected to reduce CIP mobility by over 30%, offering a practical strategy to mitigate groundwater contamination risks. This study provides a theoretical foundation for developing manure management practices that minimize antibiotic leaching, thereby supporting the groundwater quality protection and sustainable agricultural production.