Evaluation of Six Phosphorus Extraction Methods for Compliance Testing of Recycled P Fertilizers
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
Autoren
Organisationseinheiten
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
Originalsprache | Englisch |
---|---|
Aufsatznummer | 103913 |
Seitenumfang | 15 |
Fachzeitschrift | Environmental technology & innovation (OA) |
Jahrgang | 37.2025 |
Ausgabenummer | February |
DOIs | |
Status | Veröffentlicht - 27 Nov. 2024 |