Alastair Pennycook (University of Technology, Sydney, Australia)
Sinfree Makoni (USA The Pennsylvania State University)

Donald L. Sparks (Director, Delaware Environmental Institute, University of Delaware, Newark, DE, USA)
Balwant Singh (Professor of Soil Science, University of Sydney, Australia)
Matthew G. Siebecker (Assistant Professor, Applied Environmental Soil Chemistry, Dept. of Plant and Soil Science, Texas Tech University, TX, USA)