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Significance Management of agricultural phosphorus (P) has been in effect for decades with limited improvements in downstream water quality. Accumulated legacy (historical) P sources can mobilize, serve as a continual nutrient source, and mask the effects of conservation efforts to improve water quality through reductions in contemporary agricultural inputs to surface waters. We used a proxy estimate of legacy sources and assessed if P lingering in soils long after application was a major contributor to river export. For most watersheds, contributions of legacy P to river export were small in comparison to contributions from contemporary surpluses (fertilizer + manure &gt; crop uptake). Estimating the magnitude of contemporary versus legacy P sources provides critical information to support effective implementation of management plans.

Variable impacts of contemporary versus legacy agricultural phosphorus on US river water quality