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Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils: Evidence from isotopic exchange
Swedish University of Agricultural Sciences, Department of Soil and Environment.
KU Leuven, Belgium.
Swedish University of Agricultural Sciences, Department of Soil and Environment.
Swedish University of Agricultural Sciences, Department of Soil and Environment.
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2019 (English)In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 337, p. 350-358Article in journal (Refereed) Published
Abstract [en]

Efficient phosphorus (P) fertilization strategies are essential for intensive crop production with minimal negative environmental impacts. A key factor in sustainable P use is assessment of the plant available soil P pool using soil P tests. This study determined isotopically exchangeable P after six days of reaction with 33PO4 (P-E (6 d)) to determine how accurately two commonly used P tests, Olsen and AL (acid ammonium acetate lactate) can quantify the amount of labile P. Soil samples were taken from both highly P-amended and unamended plots at six sites within the Swedish long-term soil fertility experiments. According to P K-edge XANES spectroscopy, the P speciation was dominated by Al-bound P and organic P, with additional contributions from Fe-bound P and Ca phosphates in most soils. The results showed that the AL test overestimated P-E (6 d) by a factor of 1.70 on average. In contrast, the Olsen test underestimated P-E (6 d), with the mean ratios of P-Olsen to P-E (6 d) being 0.52 for high-P and 0.19 for low-P soils. The 33P/31P ratio in the Olsen extract of a 33PO4 spiked soil was closer to that of a 0.005 mol L−1 CaCl2 soil extract than the corresponding ratio in the AL extract, suggesting that AL extraction solubilized more non-labile P. In conclusion, the AL and Olsen methods are not suitable for direct quantification of the isotopically exchangeable soil P pool after 6 days of equilibration. However, based on the results, Olsen may be superior to AL for classification of soil P status, due to its even performance for calcareous and non-calcareous soils and lower extraction of non-labile P.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 337, p. 350-358
Keywords [en]
Chemical analysis, Isotopes P-33, Isotopic exchange kinetic technique, Phosphorus, Soil P test, Soils, Chlorine compounds, Cultivation, Environmental impact, Extraction, Isotopes, Soil testing, X ray absorption near edge structure spectroscopy, Agricultural soils, Ammonium acetate, Crop production, IS assessment, Isotopic exchange, Isotopic exchange kinetics, Noncalcareous soils, Soil fertility
National Category
Other Agricultural Sciences
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236319DOI: 10.1016/j.geoderma.2018.09.048ISI: 000456761500036Scopus ID: 2-s2.0-85054011888OAI: oai:DiVA.org:kth-236319DiVA, id: diva2:1264361
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QC 20181120

Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2019-04-12Bibliographically approved

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Gustafsson, Jon Petter

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