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Long-term soil accumulation of potentially toxic elements and selected organic pollutants through application of recycled phosphorus fertilizers for organic farming conditions

Weissengruber, Lina; Möller, Kurt; Puschenreiter, Markus and Friedel, Jürgen K. (2018) Long-term soil accumulation of potentially toxic elements and selected organic pollutants through application of recycled phosphorus fertilizers for organic farming conditions. Nutrient Cycling in Agroecosystems, 110, pp. 427-449.

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Document available online at: https://doi.org/10.1007/s10705-018-9907-9


Summary

The pollutant input and the risk of contamination by long-term application of recycled P fertilizers (RPFs) in European agricultural soils were estimated by a mass balance approach. Calculations based on literature data were carried out for the potentially toxic elements (PTEs) Cd, Cr, Cu, Ni, Pb, Zn and for the persistent organic pollutants (POPs) PCBs, PAHs and polychlorinated dibenzo-dioxins and -furans. The PTE accumulation estimation during 200 years of fertilizer application, equivalent to 11 kg P ha-1 year-1, the mean P export via harvested products on European stockless organic farms, regarded soil background concentrations and proposed threshold concentrations. For PTEs, inputs were fertilizer application, atmospheric deposition and liming, output processes were leaching and crop harvest. The effect of varying site conditions was assessed by considering two precipitation excess (F) values and two soil pH values. For POPs, fertilizer application and the half-life time were considered. The PTE accumulation risk was low for most RPFs. For the analysed POPs no accumulation was found. The highest accumulation was found for all PTEs at pH 7 and F = 0.1 m year-1, the lowest at pH 5 and F = 0.3 m year-1. A high P concentration in fertilizers resulted in a low PTE flow per unit of P. composts had the highest PTE accumulation risk due to lowest P contents. Struvite, meat and bone meal, digestate of catering waste, ash and biosolids would be better suited as P fertilizers. The use of fertilizers should be regulated based on their pollutant-to-nutrient ratio.


EPrint Type:Journal paper
Keywords:Risk assessment, Heavy metals, Persistent organic pollutants, Phosphorus recycling, Pollutant-to-nutrient ratio, Cadmium, IMPROVE-P, CoreOrganic2
Subjects: Soil > Soil quality
Crop husbandry > Composting and manuring
Research affiliation: European Union > CORE Organic II > IMPROVE-P
Austria > Univ. BOKU Wien
Germany > University of Hohenheim > Institute of Crop Science
H2020 or FP7 Grant Agreement Number:249667
Related Links:http://coreorganic2.org/coreorganic2.asp
Deposited By: Möller, PD Dr. Kurt
ID Code:32676
Deposited On:15 Jun 2018 07:56
Last Modified:15 Jun 2018 07:56
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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