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<p>Estimating soil nutrient components is a key analytical methodology for creating fertilization maps for agricultural fields. To develop a compact laser-induced breakdown spectroscopy (LIBS) system for fertilizer map creation, this study examined the sensitivity enhancement of phosphorus (P) and potassium (K) in soil by adding magnetic field assistance using Halbach-arrayed neodymium magnets. The LIBS signal intensity was compared with the plant-available content determined by chemical analysis. The addition of a magnetic field (~ 0.5&#xa0;T) increased the spectral intensity by ~ 1.3 times, owing to densification of the laser-induced plasma. Linearity in the calibration curve of P at 213.6&#xa0;nm in soil was maintained up to ~ 0.5 wt%, whereas saturation occurred beyond ~ 1 wt%. In contrast, no linearity was observed in the calibration curve of K at 766.5&#xa0;nm. The LIBS intensity correlated with the plant-available content; however, the magnetic-field-induced sensitivity enhancement contributed little to accuracy improvement. The spatial heterogeneity of actual soil leads to analytical errors, underscoring the importance of soil sample homogenization.</p> Graphical abstract <p></p>

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Estimation of phosphorus and potassium as nutrient components in soil using magnetic-field-assisted laser-induced breakdown spectroscopy

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Naofumi Ohtsu,
  • Eishi Hashiba,
  • Yoshifumi Kitadate,
  • Atsuto Yoshino,
  • Madoka Tachibana,
  • Mitsuhiro Hirano,
  • Masayuki Uto

摘要

Estimating soil nutrient components is a key analytical methodology for creating fertilization maps for agricultural fields. To develop a compact laser-induced breakdown spectroscopy (LIBS) system for fertilizer map creation, this study examined the sensitivity enhancement of phosphorus (P) and potassium (K) in soil by adding magnetic field assistance using Halbach-arrayed neodymium magnets. The LIBS signal intensity was compared with the plant-available content determined by chemical analysis. The addition of a magnetic field (~ 0.5 T) increased the spectral intensity by ~ 1.3 times, owing to densification of the laser-induced plasma. Linearity in the calibration curve of P at 213.6 nm in soil was maintained up to ~ 0.5 wt%, whereas saturation occurred beyond ~ 1 wt%. In contrast, no linearity was observed in the calibration curve of K at 766.5 nm. The LIBS intensity correlated with the plant-available content; however, the magnetic-field-induced sensitivity enhancement contributed little to accuracy improvement. The spatial heterogeneity of actual soil leads to analytical errors, underscoring the importance of soil sample homogenization.

Graphical abstract