Research shows soaring nitrate levels in Iowa rivers

April 12, 2015 11:46 PM

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Nitrate levels in Iowa rivers have soared since the 1950s, though recent efforts to control the spread of the fertilizer byproduct appear to be helping, research shows.

The Des Moines Register reported ( Sunday that nitrate levels have more than tripled between the 1950s and 2010, from an average of around 2 milligrams per liter from 1906-1954 to more than 7 milligrams per liter from 1954-2010. The federal standard is to have no more than 10...

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