Study shows wetlands provide landscape-scale reduction in nitrogen pollution

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In agricultural regions such as the U.S. Midwest, excess nitrate from crop fertilizer makes its way into rivers and streams through subsurface drainage channels and agricultural ditches.
High nitrate concentrations in waterways can be harmful to ecosystems and human health, ... More at https://www.nsf.gov/news/news_summ.jsp?cntn_id=244250&WT.mc_id=USNSF_51&WT.mc_ev=click
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