New research from the University of Minnesota points to lawn fertilizers and pet waste as the dominant sources of nitrogen and phosphorus pollutants in seven sub-watersheds of the Mississippi River in St. Paul, Minn.
The study — published in Proceedings of the National Academy of Sciences — is the first to compare the nitrogen and phosphorus budgets of urban watersheds. The results can be applied to urban watersheds around the world that are impaired by exces
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