YOU'RE SOAKING IN IT
Iowa's 132 lakes are among the water bodies most polluted with
fertilizers in the world, according to a study by Iowa State
University.  Researcher John Downing took three rounds of samples
from each of the lakes last summer, and the results turned up heavy
concentrations of nitrates and phosphorus, both common ingredients in
farm and yard runoff.  The nutrients feed algae, which in turn choke
off food and oxygen supplies for other plant life and fish.  The
university has embarked on a five-year study of the lakes.

straight to the source:  Des Moines Register, Perry Beeman, 06 Mar 2001
<http://www.dmregister.com/news/stories/c5903220/13992047.html>

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