A faculty member since 2008, Dr. Ruiz-Diaz uses applied field experiments to develop efficient, cost-effective, and environmentally sound nutrient management practices for agronomic crop production in Kansas. He focuses on the efficient use of fertilizers, soil test interpretations and fertilizer recommendations, as well as land application of manure and biosolids with emphasis on crop-available nitrogen. Within his research program, Dr. Ruiz-Diaz assesses environmental risks associated with nutrient management and tillage.