FILE - This June 12, 2015, file photo shows a buffer strip of grass and trees along the Rock River west of Edgerton, Minn. In a letter to the Board of Water and Soil Resources released Tuesday, April 10, 2018, Gov. Mark Dayton joined the criticism over a proposal for adding new enforcement teeth to one of his signature environmental initiatives, a state law requiring farmers to plant buffer strips of vegetation between fields and waterways to trap pollutants in the runoff. (Brian Peterson/Star Tribune via AP, File)
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