This video is a combined presentation by Mike Castellano, an Iowa State assistant professor of agronomy, and Matt Helmers, an Iowa State agricultural and biosystems engineering professor. Castellano presents information on the soil nitrogen cycle. Helmers discusses drainage and nitrate loss.
Farmers and landowners have made great strides in reducing soil and phosphorus loss thanks to the adoption of soil conservation practices over the past several decades. to address another great challenge facing land and water - the loss of nitrate-nitrogen - new methods will need to be incorporated into efforts to protect the land and water.