In the latest in his series on “Big Ag” and water pollution, veteran reporter Keith Schneider examined how taxpayer-funded public universities have played a major role in encouraging the over-use of fertilizer. Recommendations from a federal scientist, later refined at the University of Minnesota and other Corn Belt universities, encourage farmers to overuse commercial fertilizer and manure in the 10-state Corn Belt, the region with the most contaminated water in the country.