Correlation of extractable soil phosphorus (P) with plant P uptake: 14 extraction methods applied to 50 agricultural soils from Central Europe

Franz Zehetner, Rosemarie Wuenscher, Robert Peticzka and Hans Unterfrauner
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Franz Zehetner: Institute of Soil Research, University of Natural Resources and Life Sciences, Vienna, Austria
Rosemarie Wuenscher: Institute of Soil Research, University of Natural Resources and Life Sciences, Vienna, Austria
Robert Peticzka: Department of Geography and Regional Research, University of Vienna, Vienna, Austria
Hans Unterfrauner: Technical Office Unterfrauner, Vienna, Austria

Plant, Soil and Environment, 2018, vol. 64, issue 4, 192-201

Abstract: The aim of this study was to test different soil phosphorus (P) extraction methods in relation to plant P uptake. A greenhouse pot experiment was conducted with spring wheat. The soils were extracted with the following methods/extractants: H2O, CaCl2, LiCl, iron oxide impregnated filter papers (Fe-oxide Pi), Olsen, calcium-acetate-lactate (CAL), cation and anion exchange membranes (CAEM), Mehlich 3, Bray and Kurtz II (Bray II), citrate-bicarbonate-dithionite, organic P, HCl, acid ammonium oxalate, total P. Plant P uptake was in the range of the P extracted by neutral salt solutions (CaCl2, LiCl). P extracted with H2O, CaCl2 and CAEM correlated best with plant P uptake over one growing season, while several established soil P test methods, including CAL, Mehlich 3 and Bray II, did not show significant correlations. When grouping the soils according to pH, the weaker extraction methods (H2O, CaCl2, LiCl) showed significant correlations with plant P uptake only for the low and intermediate pH groups (pH in 1 mol/L KCl ≤ 6.6), while some of the stronger extraction methods (CAL, Mehlich 3, Bray II, dithionite, oxalate, total P) showed significant correlations only for the high pH group (> 6.6) comprised of calcareous soils. It was concluded that weaker P extraction methods, especially neutral salt solutions best predict plant-available P in the short term. However, they do not perform well for calcareous (and clayey) soils and do not account for P that may become available beyond one growing season.

Keywords: soil testing; macronutrient; long-term experiment; Triticum aestivum L.; plant growth; resin P (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:64:y:2018:i:4:id:70-2018-pse

DOI: 10.17221/70/2018-PSE

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