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Bioreactors Form a Last Line of Defense against Nitrate Runoff

Illustration of how a denitrifying bioreactor fits in with drainage water management (DWM). Image by John Peterson.

Illustration of how a denitrifying bioreactor fits in with drainage water management

NOTE: This year, we’ll be highlighting some of 2015’s conservation practice innovations in a monthly series. NRCS supports science-based conservation by offering technical and financial assistance for nearly 170 conservation practice standards. As conservation science and technology advances, NRCS reevaluates each standard every five years and incorporates new advancements into conservation practice standards.

Walk to the edge of certain crop fields in Iowa and look down. You might not notice anything unusual, but just beneath the surface hordes of woodchip-dwelling microorganisms are busy removing excess nitrates from water before it leaves the field. By filtering nitrates, this organic gauntlet safeguards local streams and, eventually, the Gulf of Mexico. Read more »