This map shows the fields that are likely being overloaded with phosphorus as manure is applied each year from the 23,725 feedlots that are currently active in Minnesota.
EWG used computer modeling to simulate which fields probably get manure, based on how much nitrogen is recommended for crop growth. Manure is rich in phosphorus, which can build up on fields to dangerous levels, even if manure is safely applied to meet nitrogen recommendations. When phosphorus builds up, the risk increases of pollution that triggers outbreaks of potentially toxic algae.
Counties outlined in black are hotspots for phosphorus overload at rates that can lead to accumulation in the soil. Click on a county to see details, including county name, number of feedlots, animal type responsible for the most manure production, number of acres receiving manure, and the average phosphorus overload per acre for fields receiving manure.
The pie chart shows how many fields are likely overloaded with phosphorus and the size of the overload.