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Published September 12, 2013, 12:00 AM

Alfalfa sprouts in a field at the Durst Brothers Dairy farm


In a May 30, 2013 photo, alfalfa sprouts in a field at the Durst Brothers Dairy farm in Mantorville, Minn. Crop researchers say there is a proven solution for lowering nitrates in the water supply: plant perennial crops such as alfalfa, which absorb nitrates. But not many farmers have adopted it. (AP Photo/Minnesota Public Radio, Alex Kolyer)
Read the article: Removing nitrates from Minn. water