| Autor: |
Santos, Marcela Granato Barbosa dos, Costa, Camila Rodrigues, Mendes, Gilberto de Oliveira, Blasi Paiva, Andressa, Peixoto, Ludmila Soares, Costa, Jéssica da Luz, Marchi, Giuliano, Martins, Éder de Souza, Figueiredo, Cícero Célio de |
| Předmět: |
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| Zdroj: |
Agriculture; Basel; Sep2024, Vol. 14 Issue 9, p1607, 14p |
| Abstrakt: |
Sewage sludge biochar (SSB) exhibits higher phosphorus (P) concentrations than the original sewage sludge (SS) and can be used as a P fertilizer. However, SSB-associated P is strongly retained in chemical compounds, which hinders its release and subsequent plant uptake. The use of organic acids facilitates P solubilization from SSB. Herein, we evaluated the effect of oxalic acid on P release from SSB applied to soil over time. Biochar was produced at 300 °C (SSB300) and 500 °C (SSB500). P release from SSB increased with an increasing concentration of oxalic acid in the SSB incubation solution and in SSB-treated soil. P speciation in SSB showed that P was predominantly inorganic (Pi), which represented 81% and 92% of the total P in SSB300 and SSB500, respectively. Pi in SSB consisted mainly of non-apatite P, accounting for 91% and 96% of all Pi in SSB300 and SSB500, respectively. Because SSB is predominantly insoluble in water, oxalic acid is crucial for the release of P from SSB. Oxalic acid increased P release from SSB300 and SSB500 by 103- and 600-fold, respectively, compared to the control, from which P was extracted with water. Oxalic acid enhancement of P release from SSB increases the possibility of using SSB as a sustainable source of P for agriculture. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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