Xinhua Xiao, Agronomy Building, Room 2493, Iowa State University, Ames, IA, Thomas Sauer, USDA-ARS National Laboratory for Agriculture & the Environment, Ames, IA, Jeremy Singer, USDA-ARS National Laboratory for Agriculture and the Environment, Ames, IA, Robert Horton, Agronomy Department, Ames, IA, Joshua L. Heitman, Campus Box 7619, North Carolina State University, Raleigh, NC and Tusheng Ren, Department of Soil & Water, China Agricultural University, Beijing, China