Short-term phosphorus sorption and desorption in contrasting cropped Vertisols

Nelly S. Raymond*, Peter M. Kopittke, Frederik J.T. van der Bom, N. J. Barrow, Michael J. Bell

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

3 Citationer (Scopus)
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Abstract

Vertisols are important cropping soils in tropical and subtropical areas, but in
many regions, decades of cropping has substantially reduced concentrations of
plant-available phosphorus (P), especially in the subsoil layers. Phosphorus
behaviour in P-depleted Vertisols has received comparatively little attention,
and the availability of P following the addition of inorganic P fertilisers at differ-
ent concentrations is poorly understood. In this study, we evaluated short-term
P sorption and desorption behaviour in cropped Vertisols in relation to specific
soil physical and chemical properties. We collected the surface and subsurface
of 15 Australian soils with a broad range of physical and chemical properties,
comprising nine Vertisols, three Ferralsols, two Lixisols and one Calcisol. For
each soil, we generated sorption and desorption curves (fitted with a Freundlich
equation), determined soil physical and chemical properties likely to influence P
sorption and evaluated the relationships between the measured soil properties
and the Freundlich equation sorption coefficients. The P sorption curves differed
drastically between soils, with the sorption equation coefficients (aS b) signifi-
cantly correlated with the P buffering index (PBI) and clay content. Clay content
itself was correlated with citrate-extractable Fe and Al oxides and BET surface
area. Vertisols formed on basaltic parent materials had greater Fe and Al oxide
concentrations, resulting in an overall greater P sorption capacity. Sorption and
desorption hysteresis were mostly small. The reacting materials in these soils
probably had limited ability to continue to react with P. The Vertisols differed in
their capacity to replenish P in the soil solution by desorbing different propor-
tions of previously sorbed P, although the proportion of desorbable P generally
increased with greater concentrations of sorbed P. These results suggest that for
fertiliser management in these soils, smaller volumes of P enrichment combined
with higher P concentrations may result in a greater P recovery by the crop.
OriginalsprogEngelsk
Artikelnummere13418
TidsskriftEuropean Journal of Soil Science
Vol/bind74
Udgave nummer5
Antal sider18
ISSN1351-0754
DOI
StatusUdgivet - 2023

Bibliografisk note

Funding Information:
The authors acknowledge funding from the Grains Research and Development Corporation of Australia (Project no. UOQ1905‐009RTX), which enabled this research to be conducted. The authors would also like to express their gratitude to Phil Moody who participated in the experiment design and preliminary results discussion but passed away before the submission of this manuscript. The authors would also like to thank Andrew Biggs for the information on soil formation and parent material. The authors would also like to acknowledge Doug Sands and David Lester for the soil collection and Dr. Brigid McKenna and Dr. Angus McElnea for the assistance in the laboratory. Open access publishing facilitated by The University of Queensland, as part of the Wiley ‐ The University of Queensland agreement via the Council of Australian University Librarians.

Funding Information:
The authors acknowledge funding from the Grains Research and Development Corporation of Australia (Project no. UOQ1905-009RTX), which enabled this research to be conducted. The authors would also like to express their gratitude to Phil Moody who participated in the experiment design and preliminary results discussion but passed away before the submission of this manuscript. The authors would also like to thank Andrew Biggs for the information on soil formation and parent material. The authors would also like to acknowledge Doug Sands and David Lester for the soil collection and Dr. Brigid McKenna and Dr. Angus McElnea for the assistance in the laboratory. Open access publishing facilitated by The University of Queensland, as part of the Wiley - The University of Queensland agreement via the Council of Australian University Librarians.

Publisher Copyright:
© 2023 The Authors. European Journal of Soil Science published by John Wiley & Sons Ltd on behalf of British Society of Soil Science.

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