Farm in Southern Wisconsin (2 of 2) (IMAGE)

U.S. Geological Survey

Farm in Southern Wisconsin (2 of 2)

Caption

Cows feed on a farm in southern Wisconsin. A new USGS report shows that drought periods followed by rainfall caused nitrate levels to increase to the highest ever measured in some Midwest streams during a 2013 study.

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Credit: USGS

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Credit: USGS

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