Evaluation of Six Phosphorus Extraction Methods for Compliance Testing of Recycled P Fertilizers

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Autoren

  • Alicia Hernandez-Mora
  • Olivier Duboc
  • Else K. Bünemann
  • Kari Ylivainio
  • Enzo Lombi
  • Sarah Symanczik
  • Dietmar Horn
  • Antonio Delgado
  • Lucia Zuin
  • Casey L. Doolette
  • Herbert Eigner
  • Jakob Santner

Externe Organisationseinheiten

  • Universität für Bodenkultur Wien : Standort Tulln
  • Research Institute of Organic Agriculture FiBL
  • Natural Resources Institute Finland, Jokioianen
  • University of South Australia
  • Bodengesundheitsdienst GmbH, Ochsenfurt, Germany
  • Departamento de Agronomía, ETSIA, Universidad de Sevilla, Ctra Utrera km 1, 41013, Sevilla, Spain
  • Canadian Light Source, University of Saskatchewan, 44 Innovation Place, Saskatoon, SK Canada
  • AGRANA Research & Innovation Center (ARIC). Reitherstrasse 21-23, 3430 Tulln an der Donau, Austria
  • Justus-Liebig-Universität Giessen
  • AGRANA Research & Innovation Center

Abstract

hosphorus (P) recycling for fertilizer production addresses the dependency on phosphate rock and mitigates P losses to the environment. However, predicting plant-available P in recycled fertilizers is challenging due to their diverse chemical composition. This study aimed at identifying the most suitable P extraction method for fertilizer compliance testing, considering their correlation with actual fertilization efficiency, as well as their simplicity, throughput, recognition and cost. Studies on fertilizer P compliance testing often lack recommendations on minimum P extractability threshold values. Here, thresholds are calculated based on actual fertilization efficiency of a large, chemically diverse set of recycled P fertilizers, many of which are already marketed. Thirty recycled P fertilizers were extracted with H2O, neutral ammonium citrate (NAC), electro-ultrafiltration (EUF), ferrihydrite-filled membranes (iron bag; IB), sodium bicarbonate (NaHCO3) and diffusive gradient in thin films (DGT). The mineral replacement value (MRV) of the fertilizer set was previously evaluated in three pot experiments at a fertilization rate of 50 mg kg-1 soil. MRV correlations with the extractions methods showed similar results for all besides H2O, which cannot be a reliable indicator for P availability. Fertilizers were classified as efficient or inefficient based on their MRV exceeding or falling below 60% of the triple superphosphate reference value. The minimum P extractability threshold value (MPETV) for each method was based on the efficiency classification and it minimized the number of misclassified fertilizers. NAC, with a 60% extractable minimum P threshold value, was the most adequate method for compliance testing, despite its overestimation of iron phosphate availability.

Details

OriginalspracheEnglisch
Aufsatznummer103913
Seitenumfang15
Fachzeitschrift Environmental technology & innovation (OA)
Jahrgang37.2025
AusgabenummerFebruary
DOIs
StatusVeröffentlicht - 27 Nov. 2024