Struvite recovery from wastewater streams may provide an alternative to traditional fertilizer-phosphorus (P) sources, while also providing the benefit of reducing nitrogen and P loads in wastewater effluent and reducing effects of eutrophication in surface waters. The objective of this study was to assess the effects of fertilizer-P source (i.e., synthetically produced electrochemically precipitated struvite [ECST], chemically precipitated struvite [CPST], monoammonium phosphate [MAP], diammonium phosphate [DAP], triple superphosphate [TSP], rock phosphate [RP], and an unamended control [UC]) on water-soluble (WS) and Mehlich-3 (M3)-extractable soil nutrients (i.e., K, S, Na, Mn, Zn, Cu, and B) periodically over a 9-month period (i.e., 0.5, 1, 2, 4, 6, and 9 months) in multiple soil textures. All WS and M3 nutrients were affected by a combination of soil, fertilizer treatment and/or sampling time. Both WS- and M3-S concentrations increased from the initial for all fertilizer treatments, but the increase was the greatest with DAP (26.3 mg？kg？1 and 23.4 mg？kg？1, respectively), which differed from MAP and TSP that had increases that were intermediate and were greater than for ECST, CPST, and the UC. Mehlich-3-Na concentrations increased from the initial after 0.5 months before decreasing from the initial after 1 month and steadily increasing until 9 months, at which point M3-Na concentrations had increased the most from the initial (12.26 mg？kg？1). Changes in WS and M3 nutrients were often similar among ECST, CPST, MAP, DAP, TSP, and RP, supporting the potential for struvite to be an effective alternative fertilizer-P source.
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