Conversion equations between Olsen-P and other methods used to assess plant available soil phosphorus in Europe – A review

Steinfurth, Kristin; Hirte, Juliane; Morel, Christian; Buczko, Uwe

doi:10.1016/j.geoderma.2021.115339

Cited by 39 publications

(19 citation statements)

References 39 publications

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“…The overall comparison of CAL-P and Olsen-like P is also striking, as it shows quite similar plant-available P contents for DSS, LTH, HTH, and FPy with a tendency to slightly lower values in the Olsen-like fraction. This tendency is known and true for a great variety of materials. , Only SPy shows a completely different behavior as the CAL-P is even improved compared to Olsen-like P.…”

Section: Resultsmentioning

confidence: 86%

“…Synthesis of different classical phosphate extraction schemes for environmental samples in a simplified and unified way − …”

Section: Materials and Methodsmentioning

confidence: 99%

“…This tendency is known and true for a great variety of materials. 21,45 Only SPy shows a completely different behavior as the CAL-P is even improved compared to Olsen-like P.…”

Section: Comparison Of Wet and Dry Conversionmentioning

confidence: 96%

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Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Becker,

Kruse

2023

ACS Sustainable Chem. Eng.

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Understanding phosphate speciation in thermally treated sewage sludge is important for fertilization and technological phosphate recovery. Different extraction schemes including the soil phosphate-related Hedley fractionation and the freshwater sediment-related SMT protocol are widely used in the literature to describe (hydro-) thermochemically provoked changes in sewage sludge phosphate species. The results are usually directly linked to the solubility and bioavailability. This work discusses the applicability and interpretation of these two most widely used schemes in the case study of a thermochemically treated aluminate-rich municipal sewage sludge. The studied conversion technologies are low-and high-temperature hydrothermal conversions (190 and 250 °C, respectively) and fast as well as slow pyrolysis (15 s to 7.5 min retention time, 500 °C reaction temperature). Hydrothermal treatment clearly shows a change from phosphate-related to Fe-and Al-ion associations to Ca phosphate species in both extraction schemes, while this is seen to a lesser extent after pyrolysis. Phosphate fractions, which can be believed to be plant-available, are only shown in the Hedley fractionation. They disappear during hydrothermal treatment, probably following desorption mechanisms similar to effects mimicked by common extraction tests for plant-available soil phosphate. The sequential nature of the Hedley fractionation also revealed a reduced solubility of pyrolytically altered phosphates in dilute mineral acid, which is not seen in the SMT protocol to the same extent. Therefore, the use of SMT protocol results to compare changes after hydrothermal and pyrolytic treatment can lead to the wrong assumption that the resulting phosphate fractions are similar in nature, while at the same time, directly plant-available phosphate fractions are neglected.

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Section: Resultsmentioning

confidence: 86%

“…Synthesis of different classical phosphate extraction schemes for environmental samples in a simplified and unified way − …”

Section: Materials and Methodsmentioning

confidence: 99%

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Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Becker,

Kruse

2023

ACS Sustainable Chem. Eng.

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“…International comparisons of soil P status are complicated by the varying extraction methods used in different countries because considerable inaccuracy can be introduced by method conversion equations (Neyroud & Lischer, 2003; Steinfurth et al., 2021). To place our experimental soils in an international context, we also analysed them using the well‐known Mehlich‐3 method.…”

Section: Discussionmentioning

confidence: 99%

Long‐term changes in soil phosphorus in response to fertilizer application and negative phosphorus balance under grass rotation in mineral soils in Nordic conditions

Louhisuo,

Yli‐Halla,

Termonen

et al. 2024

Soil Use and Management

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Considerable amounts of residual fertilizer phosphorus (P) have accumulated in the agricultural soils of Finland since the 1960s, and the P fertilization recommendations have been lowered. It is unknown how much P intensively managed silage grass can obtain from the accumulated reserves without a loss of yield. In two field experiments on sandy loam conducted in 2003–2020, four consecutive grass (70% timothy, 30% fescue) rotations were performed (four or five years each, including the establishment year). The grass received mineral P fertilizers (PF; 16 kg P ha−1 year−1), cattle slurry (PS; 11 kg P ha−1 year−1) or no P (P0). The organic P (Po) and inorganic P (Pi) pools in 2003 and 2020 samples were determined following the Hedley procedure using H2O, NaHCO3, NaOH, and HCl as sequential extractants. Soil test P (STP) was monitored annually using ammonium acetate extraction. The results showed that the cumulative P balance (P0: −344– −412 kg ha−1; PF and PS: −101– −198 kg ha−1) was highly negative, resulting in declining STP. Still, after 18 years, the grass showed no consistent yield response to P fertilization. The most significant Pi decline occurred in the Pi–NaHCO3 (~30%) and Pi–NaOH (~50%) pools, while the changes in Po were negligible. This study and international comparisons, Mehlich‐3, degree of P saturation and the result of Hedley in other studies, suggest that these soils, initially above the critical STP level, contain plenty of legacy P and can provide perennial grass with sufficient P for a long time.

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“…Efforts have been made by the Global Soil Laboratory Network (GLOSOLAN), established in 2017, to build and strengthen the capacity of laboratories in soil analysis globally and respond to the need for harmonising soil analytical data. In recent years, a number of publications have compared soil test methods for P (Buczko et al, 2018;Jordan-Meille et al, 2012;Nawara et al, 2017;Steinfurth et al, 2021;Steinfurth et al, 2022;T oth et al, 2014), and it is widely known that at least 10 soil P tests are used across European countries, as shown in the present study. It has also been known for a number of years that there is often poor correlation among those tests, but alternatives or resolutions have not been forthcoming.…”

Section: Soil Extraction Test Methods For P K Mg and Camentioning

confidence: 99%

Stocktake study of current fertilisation recommendations across Europe and discussion towards a more harmonised approach

Higgins,

Keesstra,

Kadziuliene

et al. 2023

European J Soil Science

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The European Commission has set targets for a reduction in nutrient losses by at least 50% and a reduction in fertiliser use by at least 20% by 2030, while ensuring no deterioration in soil fertility. Within the mandate of the European Joint Programme EJP Soil “Towards climate‐smart sustainable management of agricultural soils”, the objective of this study was to assess current fertilisation practices across Europe and discuss the potential for harmonisation of fertilisation methodologies as a strategy to reduce nutrient loss and overall fertiliser use. A stocktake study of current methods of delivering fertilisation advice took place across 23 European countries. The stocktake was in the form of a questionnaire, comprising 46 questions. Information was gathered on a large range of factors, including soil analysis methods, along with soil, crop and climatic factors taken into consideration within fertilisation calculations. The questionnaire was completed by experts, who are involved in compiling fertilisation recommendations within their country. Substantial differences exist in the content, format and delivery of fertilisation guidelines across Europe. The barriers, constraints and potential benefits of a harmonised approach to fertilisation across Europe are discussed. The general consensus from all participating countries was that harmonisation of fertilisation guidelines should be increased, but it was unclear in what format this could be achieved. Shared learning in the delivery and format of fertilisation guidelines and mechanisms to adhere to environmental legislation were viewed as being beneficial. However, it would be very difficult, if not impossible, to harmonise all soil test data and fertilisation methodologies at EU‐level due to diverse soil types and agro‐ecosystem influences. Nevertheless, increased future collaboration especially between neighbouring countries within the same environmental zone was seen as potentially very beneficial. This study is unique in providing current detail on fertilisation practices across European countries in a side‐by‐side comparison. The gathered data can provide a baseline for the development of scientifically based EU policy targets for nutrient loss and soil fertility evaluation.This article is protected by copyright. All rights reserved.

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Conversion equations between Olsen-P and other methods used to assess plant available soil phosphorus in Europe – A review

Cited by 39 publications

References 39 publications

Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Long‐term changes in soil phosphorus in response to fertilizer application and negative phosphorus balance under grass rotation in mineral soils in Nordic conditions

Stocktake study of current fertilisation recommendations across Europe and discussion towards a more harmonised approach

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