新西兰研究人员发现从污水处理中回收的鸟粪石是一种可行的磷肥替代品，有望缓解进口磷酸盐价格高企和供应不稳定的压力。1
该国磷肥完全依赖进口，成本压力持续上升。1单过磷酸盐肥料价格自2000年以来已翻倍，从每吨200新西兰元上升至400新西兰元，期间2008年曾达480新西兰元，2022年达到500新西兰元，预计2026年将突破550新西兰元。1田间试验表明，相比单过磷酸盐，施用鸟粪石可使多年生黑麦草对磷的吸收增加超过30%。1温室实验进一步显示，鸟粪石的植物磷吸收率平均比传统肥料高49%。1
除了提高肥效，鸟粪石还能减少环境污染。1排水试验结果表明，在低磷保留能力的土壤中，单过磷酸盐的总磷淋溶量比鸟粪石高80%，说明鸟粪石有助于降低土壤磷素流失。1目前，Watercare Services公司已在新西兰的Mangere污水处理厂实现鸟粪石的规模化回收。1
New Zealand researchers have identified struvite, a mineral recovered from wastewater treatment, as a viable substitute for conventional phosphate fertilisers.1 Field trials demonstrated that perennial ryegrass achieved over 30% greater phosphorus uptake when treated with struvite compared to single superphosphate.1 The findings address mounting pressure on fertiliser costs, as single superphosphate prices have doubled since 2000, rising from NZ$200 per tonne to NZ$400, with rates peaking at NZ$480 in 2008, NZ$500 in 2022, and projected to reach NZ$550 by 2026.1
Laboratory and field experiments revealed additional advantages of the recovered material. Greenhouse data showed that struvite delivered an average 49% higher plant-available phosphorus uptake than single superphosphate.1 A leaching trial in low-phosphorus-retention soils indicated that single superphosphate released 80% more total phosphorus into drainage water than struvite, suggesting the recovered mineral could reduce nutrient loss and environmental runoff.1 Since New Zealand relies entirely on imported phosphate for its fertiliser needs,1 the practical implementation of this alternative has already begun—Watercare Services has established large-scale struvite recovery operations at the Mangere wastewater treatment plant.1
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