首页|Thresholds of target phosphorus fertility classes in European fertilizer recommendations in relation to critical soil test phosphorus values derived from the analysis of 55 European long-term field experiments

Thresholds of target phosphorus fertility classes in European fertilizer recommendations in relation to critical soil test phosphorus values derived from the analysis of 55 European long-term field experiments

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  • NSTL
  • Elsevier
? 2022 Elsevier B.V.Phosphorus (P) fertilizer recommendations of individual countries may differ in many aspects, but often the main principle is to reach or maintain a target range of plant-available P in soil. Within this target P fertility class, the soil is expected to supply enough P to the crop, while P fertilization replaces what is exported by the harvested crop. However, the threshold values of the target P fertility classes are based on a multitude of different soil test P (STP) methods and vary by a factor of up to three, even for countries using the same STP method. This study aimed to provide a comparison of the thresholds of target P fertility classes of different European countries and critical soil test P values (Pcrit; STP below which the average relative yield falls below 95% due to P insufficiency) derived from the analysis of data from 55 long-term field experiments in eight European countries. To overcome the issue of diverging STP methods, all values were converted to Olsen-P using empirically based conversion equations from the literature. Converted threshold values varied by a factor of up to five. For the experimental data, we fitted multi-level Mitscherlich-type models to determine Pcrit values of unfertilized soils corresponding to 95% of maximum yield. We found an average Olsen-Pcrit value of 15 mg P kg?1 (adj. R2 = 0.37; RMSE = 14.1% relative yield; n = 2368; 55 experiments), which lies far below several country-specific thresholds of target P fertility classes. Crop-specific analyses resulted in higher Olsen-Pcrit values for sugar beet (22 mg P kg?1), potato (19 mg P kg?1) and winter rapeseed (18 mg P kg?1). Among the texture classes (loam, sand, silt and clay), sandy soils exhibited the highest average Olsen-Pcrit value (22 mg P kg?1). We consider a reevaluation of extraordinarily high country-specific thresholds as well as an inclusion of crop type and soil texture (where not already implemented) to be a reasonable measure towards more cost-effective and environment-friendly P fertilization.

Critical soil test PFertilizer recommendationOlsen-PP fertilizationPhosphorus

Gans W.、Heyn J.、Hirte J.、Huyghebaert B.、Koch D.、Merbach I.、Mokry M.、Panten K.、Peiter E.、Poulton P.R.、Reitz T.、Rubaek G.H.、Spiegel H.、von Tucher S.、Steinfurth K.、van Laak M.、Buczko U.、Borjesson G.、Denoroy P.、Mollier A.、Jouany C.、Morel C.、Eichler-Lobermann B.

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Martin Luther University Halle-Wittenberg

Landesbetrieb Landwirtschaft Hessen (LLH)

Agroscope Agroecology and Environment Water Protection and Substance Flows

Walloon Agricultural Research Centre (CRA-W) Soil Water and Integrated Production

Landesbetrieb Landwirtschaft Hessen Fachgebiet Fachinformation Pflanzenbau

Versuchsstation Bad Lauchst?dt Helmholtz Centre for Environmental Research GmbH – UFZ

Agricultural Technology Center Augustenberg

Julius Kühn Institute (JKI) Federal Research Centre for Cultivated Plants Institute for Crop and Soil Science

Plant Nutrition Laboratory Institute of Agricultural and Nutritional Sciences Martin Luther University Halle-Wittenberg

Rothamsted Research Sustainable Agriculture Sciences Department

UFZ – Helmholtz-Centre for Environmental Research Soil Ecology Department

Aarhus University Department of Agroecology

Austrian Agency for Health and Food Safety – AGES Institute for Sustainable Plant Production Department for Soil Health and Plant Nutrition

Technical University of Munich Crop Physiology

University of Rostock Landscape Ecology and Site Evaluation

Swedish University of Agricultural Sciences Department of Soil and Environment

ISPA Bordeaux Sciences Agro INRAE

Université de Toulouse INRAE UMR AGIR

University of Rostock Agronomy and Crop Science

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2022

10.1016/j.agee.2022.107926

Agriculture, Ecosystems & Environment

Agriculture, Ecosystems & Environment

ISSN：0167-8809
年,卷(期)：2022.332
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