Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils: Evidence from isotopic exchange

Braun, Sabina; Warrinnier, Ruben; Börjesson, Gunnar; Ulén, Barbro; Smolders, Erik; Gustafsson, Jon Petter

doi:10.1016/j.geoderma.2018.09.048

Cited by 22 publications

(13 citation statements)

References 32 publications

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“…In the case of the error in calibrated energy, the 0th and 100th percentiles were set to −0.05 and 0.05 eV (see Figure S1). This implies a slightly smaller error than that associated with energy calibration itself (±0.11 eV, [18]), but represents the error range observed when variscite was used as an internal calibration check. For the normalization errors, we assumed a maximum error of 7% from the initial LCF at E 0 and below.…”

Section: Uncertainty Analysismentioning

confidence: 81%

“…Four additional samples-Ekebo A3, Ekebo D3, Fors A3, and Fors D3-were taken from the Swedish long-term soil fertility experiments. The Ekebo soil was a loamy Haplic Phaeozem, whereas the Fors soil was a silty-loamy Calcaric Phaeozem [10,15,18]. The samples were taken from the A horizon (0-20 cm), and are from plots receiving different amounts of PK fertilizer, where the A3 plots received no P or K, whereas the D3 plots received 30 kg P and 80 kg K ha −1 yr −1 , plus replacement of harvested P and K. Tärnsjö Oe and Tärnsjö Bs are from a sandy Haplic Podzol 60 km NW of Uppsala, Sweden, where the Oe horizon is from the mor layer and the Bs horizon is from the uppermost part of the B horizon at 10-20 cm depth.…”

Section: Soil Samplesmentioning

confidence: 99%

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A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

et al. 2020

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A common technique to quantitatively estimate P speciation in soil samples is to apply linear combination fitting (LCF) to normalized P K-edge X-ray absorption near-edge structure (XANES) spectra. Despite the rapid growth of such applications, the uncertainties of the fitted weights are still poorly known. Further, there are few reports to what extent the LCF standards represent unique end-members. Here, the co-variance between 34 standards was determined and their significance for LCF was discussed. We present a probabilistic approach for refining the calculation of LCF weights based on Latin hypercube sampling of normalized XANES spectra, where the contributions of energy calibration and normalization to fit uncertainty were considered. Many of the LCF standards, particularly within the same standard groups, were strongly correlated. This supports an approach in which the LCF standards are grouped. Moreover, adsorbed phytates and monetite were well described by other standards, which puts into question their use as end-members in LCF. Use of the probabilistic method resulted in uncertainties ranging from 2 to 11 percentage units. Uncertainties in the calibrated energy were important for the LCF weights, particularly for organic P, which changed with up to 2.7 percentage units per 0.01 eV error in energy. These results highlight the necessity of careful energy calibration and the use of frequent calibration checks. The probabilistic approach, in which at least 100 spectral variants are analyzed, improves our ability to identify the most likely P compounds present in a soil sample, and a procedure for this is suggested in the paper.

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Section: Uncertainty Analysismentioning

confidence: 81%

Section: Soil Samplesmentioning

confidence: 99%

A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

et al. 2020

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“…An estimation of potential P availability has often been based on total soil P concentrations, P lability, the presence of P binding sites and/or has been characterized by P adsorption behavior of the soil simulated by adsorption isotherms in batch equilibrium experiments (Leinweber et al 1999 ; Maguire et al 2001 ; Shaheen et al 2007 , 2009 ; Braun et al 2019 ). Some studies also used P species determined by P K -edge X-ray absorption near-edge structure (XANES) spectroscopy to estimate P availability under different fertilization scenarios (Eriksson et al 2016 ; Koch et al 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Speciation and sorption of phosphorus in agricultural soil profiles of redoximorphic character

Baumann

Shaheen

et al. 2020

Environ Geochem Health

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Controlled drainage is considered as a soil management tool to improve water supply to crops and reduce nutrient losses from fields; however, its closure may affect phosphorus (P) mobilization in soil. To assess the P mobilization potential, three soil profiles with redoximorphic features were selected along a slight hill in Northern Germany. Soil samples from three depths of each profile were characterized for basic properties, total element content, oxalate-and dithionite-extractable pedogenic Al, Fe and Mn Electronic supplementary material The online version of this article (

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“…Different soil characteristics affected the relationship between added P and Olsen-P. The untreated soil Olsen-P (c) was positively influenced by TP and CAlox prior to P addition, and negatively influenced by A/CMnox, suggesting that the Olsen extraction method can more efficiently extract P from CAlox than A/CMnox (Braun et al, 2019). It has been shown that phosphate binding to C/AAlox consists mainly of surface complexes that are readily extracted by weak extraction solutions (Gypser, Hirsch, Schleicher, & Freese, 2018;Gypser, Schutze, & Freese, 2019).…”

Section: Discussionmentioning

confidence: 99%

Investigation of the soil properties that affect Olsen P critical values in different soil types and impact on P fertiliser recommendations

Tandy

Hawkins

Dunham

et al. 2021

European J Soil Science

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Optimization of phosphorus (P) fertiliser use is desired to ensure more sustainable use of fertiliser, economic food production and reduction of eutrophication of water bodies. Presently, the Olsen P values on which fertiliser recommendations are based to achieve optimum yield are frequently the same for all soils. The aim of this study was to identify the properties of different soils that affect their critical Olsen P values in order to develop better, soilspecific P fertiliser recommendations. A pot experiment using 10 soils with low available P with different P additions was carried out to investigate the impact of wide-ranging soil properties on the relationship between P addition, resultant Olsen P values and yield response of ryegrass to Olsen P values. The relationship between added P and Olsen P varied greatly between the individual soils. These relationships were affected by pH, manganese oxide, crystalline aluminium oxide and amorphous iron oxide contents of the soil. Different soils had widely varying critical Olsen P values for ryegrass. However, these could not be related to the measured soil properties. Fertiliser recommendations and critical values for optimum yield of ryegrass based on the Olsen P test should be soil specific. The complexity and lack of clarity over which combination of soil properties governs critical Olsen P values calls for further investigation with more soil types and additional soil property measurements to elucidate the different factors controlling critical Olsen P values in different soils. Highlights• Soil-specific P fertiliser recommendations are needed for sustainable fertiliser use • We investigated soil properties affecting critical Olsen P values and added P fertiliser availability • Fertiliser P availability was affected by pH and metal (hydr)oxide contents of the soil

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Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils: Evidence from isotopic exchange

Cited by 22 publications

References 32 publications

A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

A Probabilistic Approach to Phosphorus Speciation of Soils Using P K-edge XANES Spectroscopy with Linear Combination Fitting

Speciation and sorption of phosphorus in agricultural soil profiles of redoximorphic character

Investigation of the soil properties that affect Olsen P critical values in different soil types and impact on P fertiliser recommendations

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