C. Jerry Nelson, Emeritus Curators' Professor of Plant Sciences at the University of Missouri, USA. His research focuses on growth of grasses and persistence of legumes and he is active in agriculture-related international programs. Michael Collins, Emeritus Professor and former Director of the Division of Plant Sciences at the University of Missouri, USA. Kenneth J. Moore, Charles F. Curtiss Distinguished Professor in Agricultural and Life Sciences and Professor of Agronomy at Iowa State University, USA.