Long-term monitoring of nitrate levels in 22 large rivers shows no widespread evidence of improvement, although nitrogen from fertilizer and livestock sources has been fairly stable since the 1980s, says the U.S. Geological Survey. Nitrate levels increased as much as five-fold in river water in intensively farmed sections of the Midwest from 1945-80. Since then,… » Read More
The Ag Insider content is only available to members.