Phosphorus overloading Nine counties* account for over half of the nearly 1.5 million acres where application of manure adds at least 10 pounds per acre more phosphorus than needed by crops. Hover/tap a county for details
Note: Swift and Benton counties are included in the highest category, but have fewer acres that exceed the level of phosphorus excess used by the nine counties that are considered 'hot spots'.
Mark Boswell, Star Tribune
Source:Environmental Working Group