A sustainable P source is imperative to ensure that food production can supply a growing global population. Wastewater-recovered struvite (MgNH₄PO₄ · 6H₂O) has emerged as an attractive option because of the ability to recover P from waste streams. This study aimed to evaluate total extractable soil P from electrochemically precipitated struvite (ECST) compared with other fertilizer-P sources [chemically precipitated struvite (CPST), diammonium phosphate (DAP), and rock phosphate] in two soil textures (two different silt loams and a silty clay loam) over time in a flooded soil environment. An equivalent fertilizer rate of 24.5 kg P ha^–1 was used. The change in water-soluble (WS) and Mehlich-3 (M3)-extractable nutrient concentrations (P, K, Ca, Mg, and Fe) from their initial concentrations was determined five times over a 4-mo period. After 0.5 mo, WS-P increased the most from the initial value with DAP (27.6 mg kg^–1), which did not differ from CPST or ECST. After 0.5 mo, M3-P increased the most in ECST (82 mg kg^–1), which did not differ from DAP. After 1 mo and thereafter under flooded conditions, M3-P increased the most from the initial value and was similar among ECST, CPST, and DAP. After 3 and 4 mo, WS-P was greater than the initial value in DAP only, but remained similar to CPST, ECST, and rock phosphate, which did not differ from the initial value. Comparable WS- and M3-P concentrations among ECST, CPST, and DAP under flooded conditions support struvite's agronomic potential as a prospective sustainable fertilizer-P source.

中文翻译：

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受鸟粪石和其他肥料-磷源影响的淹水土壤中的总可提取磷

可持续的磷源对于确保粮食生产能够供应不断增长的全球人口至关重要。废水回收鸟粪石 (MgNH ₄ PO ₄ · 6H ₂ O) 已成为一种有吸引力的选择，因为它能够从废物流中回收 P。本研究旨在评估电化学沉淀鸟粪石 (ECST) 与其他肥料磷源 [化学沉淀鸟粪石 (CPST)、磷酸二铵 (DAP) 和磷酸岩] 在两种土壤质地（两种不同的粉砂壤土）中的总可提取土壤磷和粉质粘土）随着时间的推移在淹没的土壤环境中。当量施肥量为 24.5 kg P ha ^–1被使用。水溶性 (WS) 和 Mehlich-3 (M3) 可提取营养物浓度（P、K、Ca、Mg 和 Fe）相对于其初始浓度的变化在 4 个月内测定了五次。0.5 个月后，WS-P 与 DAP（27.6 mg kg ^–1）的初始值相比增加最多，这与 CPST 或 ECST 没有区别。0.5 个月后，M3-P 在 ECST 中增加最多（82 mg kg ^–1)，这与 DAP 没有区别。在淹水条件下 1 个月之后，M3-P 比初始值增加最多，并且在 ECST、CPST 和 DAP 之间相似。3 和 4 个月后，WS-P 仅在 DAP 中大于初始值，但与 CPST、ECST 和磷酸盐岩保持相似，与初始值没有区别。在淹水条件下，ECST、CPST 和 DAP 之间可比的 WS- 和 M3-P 浓度支持鸟粪石作为潜在的可持续肥料-P 来源的农艺潜力。