Dr. Antonio Mallarino is Professor of Agronomy and Nutrient Management Extension Specialist at Iowa State University. His research and extension programs emphasize phosphorus, potassium, lime, and micronutrients management. His work focuses on soil and plant tissue sampling and testing, placement methods, use of precision agriculture technologies, and fertilizer or manure phosphorus management impacts on water quality. He is Fellow of the American Society of Agronomy and the Soil Science Society of America. He was member of teams that developed the Iowa Phosphorus Index and the Iowa Nutrient Export Reduction Strategy.