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<p>Fluoride (F), an essential trace element with dual health implications, poses significant ecological risks when its biogeochemical cycle is disrupted in soil-crop systems. This study addresses the limitations of total soil F content in assessing crop F bioavailability through a systematic investigation of 30 paired agricultural soil-wheat samples from Zhouzhi County, Guanzhong Plain. Sequential extraction revealed residual F as the dominant speciation (79.5–99.04% of total F), significantly restricting its environmental mobility. While surface soils exhibited elevated total F (753.3&#xa0;mg&#xa0;kg⁻<sup>1</sup> mean), wheat grains maintained safe F levels (1.2&#xa0;mg&#xa0;kg⁻<sup>1</sup> mean). A robust multivariate model (<i>R</i><sup>2</sup> = 0.72) integrating water-soluble F, CaO, Mn, Al<sub>ox</sub>-Fe<sub>ox</sub> complexes, P, and pH effectively predicted wheat F accumulation, with water-soluble F contributing the biggest to total variance. These findings could provide scientific support for green agricultural practices in F-affected regions.</p> Graphical Abstract <p></p>

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Multivariate model for predicting crop fluorine content based on soil physicochemical properties and fluorine speciation

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Boxin Feng,
  • Liming Gan,
  • Qianni Men,
  • Jiufen Liu,
  • Yixin He,
  • Na Guo,
  • Tao He,
  • Xiao Wang,
  • Ronghua Li,
  • Yajun Han

摘要

Fluoride (F), an essential trace element with dual health implications, poses significant ecological risks when its biogeochemical cycle is disrupted in soil-crop systems. This study addresses the limitations of total soil F content in assessing crop F bioavailability through a systematic investigation of 30 paired agricultural soil-wheat samples from Zhouzhi County, Guanzhong Plain. Sequential extraction revealed residual F as the dominant speciation (79.5–99.04% of total F), significantly restricting its environmental mobility. While surface soils exhibited elevated total F (753.3 mg kg⁻1 mean), wheat grains maintained safe F levels (1.2 mg kg⁻1 mean). A robust multivariate model (R2 = 0.72) integrating water-soluble F, CaO, Mn, Alox-Feox complexes, P, and pH effectively predicted wheat F accumulation, with water-soluble F contributing the biggest to total variance. These findings could provide scientific support for green agricultural practices in F-affected regions.

Graphical Abstract