Agronomic efficiency of phosphate fertilizers produced by the re-use of a metallurgical acid residue.

Autor: Barreto MSC; Department of Soil Science, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil., Mattiello EM; Department of Soil Science, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil., Santos WO; Department of Soil Science, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil. Electronic address: wedosantos@gmail.com., Melo LCA; Department of Soil Science, Universidade Federal de Lavras, 37200-000 Lavras, MG, Brazil., Vergütz L; Department of Soil Science, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil., Novais RF; Department of Soil Science, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2018 Feb 15; Vol. 208, pp. 1-7. Date of Electronic Publication: 2017 Dec 11.
DOI: 10.1016/j.jenvman.2017.11.075
Abstrakt: The production of fertilizers with industrial wastes reduces the environmental impacts of waste disposal and improves environmental sustainability by generating added-value products. Our objective with this study was to evaluate the agronomic performance and potential soil/plant contamination with heavy metals of alternative phosphate (P) fertilizers, obtained from the acidulation of phosphate rocks (PR) by a metallurgical acidic waste. Seven P fertilizers were evaluated: three PR (Araxá, Patos, and Bayóvar), their respective acidulated products (PAPR), and triple superphosphate fertilizer (TSP). A greenhouse trial was carried out to test the agronomic performances of fertilizers in a sequentially cultivated maize-soybean-white oat. The reaction of PR with acid waste was effective to increase their solubility and improve plant yield and P uptake compared to their natural PR. There was a cumulative recovery by plants of 1.4 and 8.1% of added P via PR and PAPR, respectively. No increase in heavy metal (Cd, Pb, Cr, and Ni) availability in soil or accumulation in shoots was observed, indicating that the PAPR were environmentally safe. The usage of acid waste to produce P fertilizers therefore represents a strategic way to employ marginal products for the production of fertilizers.
(Copyright © 2017 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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