| Title | Assessing microbially mediated vivianite as a novel phosphorus and iron fertilizer |
|---|---|
| ID_Doc | 16105 |
| Authors | Eshun, LE; García-López, AM; Recena, R; Coker, V; Shaw, S; Lloyd, J; Delgado, A |
| Title | Assessing microbially mediated vivianite as a novel phosphorus and iron fertilizer |
| Year | 2024 |
| Published | Chemical And Biological Technologies In Agriculture, 11, 1 |
| Abstract | Background Microorganisms can transform phosphorus (P)-enriched iron (Fe)-oxide sludge into products with higher P concentration or can directly promote the precipitation of P-rich compounds from water. However, there is no evidence of these products' efficiency as fertilizers. This study aimed to assess the effectiveness of microbially mediated vivianite (biovivianite) as P and Fe fertilizer for durum wheat and white lupin, respectively.Results To this end, two completely randomized block experiments were conducted with wheat (phosphorus (P) experiment) and white lupin (iron (Fe) experiment). The P and Fe sources used included biovivianite produced by microbial reduction of P-containing ferrihydrite at pH 6.5 (VivInsol6.5) and pH 7.0 (VivInsol7.0), biovivianite produced with soluble Fe(III) citrate (C6H5FeO7) in the presence of soluble phosphate at pH 7 (VivSol), and vivianite from a commercial company (ComViv). Potassium dihydrogen phosphate (KH2PO4) was used as a reference fertilizer in the P experiment, and Fe-EDDHA and Fe(II)-sulfate (FeSO4.7H2O) were used in the Fe experiment. Total P uptake by wheat plants from the product dominated by vivianite and phosphate-green rust (VivSol) was not significantly different from KH2PO4. The relative P use efficiency, i.e., the equivalence in terms of P recovery of VivSol was 74% of KH2PO4, making VivSol the effective P source for durum wheat among the products tested (aside from KH2PO4). For Fe uptake, product dominated by vivianite and metavivianite (VivInsol7.0), was the most effective Fe source for white lupin followed by Fe-EDDHA, ComViv, and VivSol with VivInsol6.5 as the least effective but without significant differences with Fe(II)-sulfate. The average crystallite sizes of the biovivianite were 59 nm, 63 nm, and 66 nm for VivSol, VivInsol7.0, and VivInsol6.5, respectively.Conclusions The mineral constituents of the biovivianite coupled with their nano-crystallite sizes explained its effectiveness as P and Fe fertilizers. The results reveal that biovivianite production is a novel way of producing efficient P and Fe fertilizers from P-enriched Fe sludge or P-rich water. Thus, it can be used for producing fertilizers with high P and Fe concentrations from water purification, providing new tools for a circular economy approach in the use of a non-renewable resource such as P. Vivianite is a sink for phosphorus (P), a scarce and non-renewable resource. Microbially mediated vivianite (biovivianite) was tested as P and Fe fertilizer on wheat and lupin. Biovivianite could replace soluble P (KH2PO4) by 74% as a P fertilizer for wheat. Biovivianite was a more efficient P source than chemically synthesized vivianite. The nano-crystallite size and mineral phases of biovivianite influenced its efficiency as P and Fe fertilizer. |
| https://chembioagro.springeropen.com/counter/pdf/10.1186/s40538-024-00558-0 |
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