He is also a Soil Fertility Specialist with University of Wisconsin-Extension. He earned his B.S. and M.S. at the University of Minnesota and Ph.D. from Purdue University. He is currently an Associate Editor for Agronomy Journal and serves at the Faculty Advisor to the UW-Discovery Farms program. Dr. Ruark's research on cover crops focuses on nutrient cycling in grain, vegetable, and dairy production systems. Specific research includes: assessing the benefits of radish as a cover crop, quantifying the nitrogen credit of legume cover crop species, and utilizing grass cover crops with fall manure applications to reduce nitrate leaching. For more information on Dr. Ruark's research and extension program, go to www.ruarklab.soils.wisc.edu.