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Background and aims <p>This study assessed the impact of pH modification of pig slurry on the dynamics of slurry- and soil-derived phosphorus (P) after surface application, as a potential alternative to inorganic P fertilizers.</p> Methods <p>Mineral acidification (pH 5), bio-acidification (pH 5), and alkalinization (pH 9.5) were the strategies used to modify the pH of pig slurry using paper industry by-products and additive combinations. Maize seedlings were grown in rhizoboxes to monitor root and shoot traits over 23 days. The labile P pool in the sandy loam soil was labeled with <sup>33</sup>P to distinguish between soil- and fertilizer-derived P. Post-harvest analyses included acid phosphatase activity and mycorrhizal root colonization.</p> Results <p>All (bio)-acidified treatments significantly increased slurry water-extractable P by 70% but spent acid by-product reduced maize root growth and total P uptake. Alkalinized slurry did not affect root growth, P uptake, or soil enzymatic activity. Root branching and length were diminished in all acidified treatments, accompanied by a 59% reduction in enzymatic activity and mycorrhizal root colonization remaining below 10% across treatments.</p> Conclusion <p>While acidified slurry improved P solubility, gains in plant P uptake and biomass were limited, likely due to inhibitory effects on root development and symbiotic microbial functions, reflecting trade-offs between P availability and plant-soil biological interactions.</p>

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Phosphorus dynamics in a sandy soil amended with ph-modified pig slurry: insights from a rhizobox study using 33P isotopes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月26日

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  • Stamatis Chrysanthopoulos,
  • Pietro Sica,
  • Eusun Han,
  • Marie Louise Bornø,
  • Amandine Germon,
  • Luisa Brito,
  • João Coutinho,
  • Dorette Müller-Stöver,
  • David Fangueiro

摘要

Background and aims

This study assessed the impact of pH modification of pig slurry on the dynamics of slurry- and soil-derived phosphorus (P) after surface application, as a potential alternative to inorganic P fertilizers.

Methods

Mineral acidification (pH 5), bio-acidification (pH 5), and alkalinization (pH 9.5) were the strategies used to modify the pH of pig slurry using paper industry by-products and additive combinations. Maize seedlings were grown in rhizoboxes to monitor root and shoot traits over 23 days. The labile P pool in the sandy loam soil was labeled with 33P to distinguish between soil- and fertilizer-derived P. Post-harvest analyses included acid phosphatase activity and mycorrhizal root colonization.

Results

All (bio)-acidified treatments significantly increased slurry water-extractable P by 70% but spent acid by-product reduced maize root growth and total P uptake. Alkalinized slurry did not affect root growth, P uptake, or soil enzymatic activity. Root branching and length were diminished in all acidified treatments, accompanied by a 59% reduction in enzymatic activity and mycorrhizal root colonization remaining below 10% across treatments.

Conclusion

While acidified slurry improved P solubility, gains in plant P uptake and biomass were limited, likely due to inhibitory effects on root development and symbiotic microbial functions, reflecting trade-offs between P availability and plant-soil biological interactions.