Dr. Matt Helmers, Iowa State University (IMAGE)

Iowa State University

Dr. Matt Helmers, Iowa State University

Caption

Nitrates that leach into the soil can affect communities that depend on the rivers for clean drinking water. They can leach into the soil and are carried downstream. These nitrates are believed to contribute to a dead zone in the Gulf of Mexico where few plants or animals survive.

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ISU photo by Bob Elbert.

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