Governor Mark Dayton is proposing a nitrogen rule that aims to address the challenges of nitrates contaminating drinking water. Minnesota's Ag Commissioner Dave Fredrickson announced plans last week to have farmers apply nitrate fertilizer in the spring instead of the fall to prevent runoff. House Representative Clark Johnson (D-North Mankato) says some areas of the state are vulnerable to groundwater contamination. Rep. Clark Johnson "In Nicollet and in our area Blue Earth County, we have really thick soils and lot of clay. So water doesn't leach through very fast. But up in the sandy soils that run basically along [...]