Dr. Antonio Mallarino is Professor of Agronomy, Nutrient Management Research and Extension Specialist, at Iowa State University. His programs emphasize  management of phosphorus, potassium, lime, and micronutrients including soil and plant testing, fertilizer and manure placement, use of precision agriculture technologies, and phosphorus impacts on water quality. He contributes to the development of Iowa nutrient management guidelines, the Iowa Phosphorus Index ,and the Iowa Nutrient Reduction Strategy. He represents Iowa at the North Central Region Committee for Soil Testing and Plant Analysis (NCERA-13), the North America Minimizing P Losses from Agriculture Work Group (SERA-17) and has served in the North American Proficiency Testing Program oversight committee (NAPT) and as Associate Editor of Agronomy Journal and Soil Science Society of America Journal.