Raja Reddy, left, Mississippi Agricultural and Forestry Experiment Station researcher, explains a project he is conducting at Mississippi State's Soil-Plant-Atmosphere-Research site at the university's R.R. Foil Plant Science Research Center during a visit by U.S. Secretary of Agriculture Tom Vilsack. Vilsack visited Mississippi State Wednesday [Sept. 25] for a tour of campus and briefings on major research projects funded by the Department of Agriculture.