Articles | Volume 11, issue 1
https://doi.org/10.5194/soil-11-389-2025
https://doi.org/10.5194/soil-11-389-2025
Short communication
 | 
21 May 2025
Short communication |  | 21 May 2025

Isotopic exchangeability reveals that soil phosphate is mobilised by carboxylate anions, whereas acidification had the reverse effect

Siobhan Staunton and Chiara Pistocchi

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Short summary
Mineral phosphate is a finite resource, so ways must be found to optimise the use of native soil P. We have used isotopic dilution to assess how acidification and the addition of citrate or oxalate modify the lability of soil P in four contrasting soils from the Mediterranean region. Acidification did not mobilise soil P, whereas both carboxylate anions promoted soil-P lability. This suggests that soil amendments and the choice of crops that exude carboxylates could optimise P nutrition.
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