1. Department of Agricultural and Environmental Sciences, Tennessee State University, Nashville, TN 37209, USA
2. Otis L. Floyd Nursery Research Center, Tennessee State University, McMinnville, TN 37110, USA
3. Department of Biological and Agricultural Engineering, Texas A&M AgriLife Research, Texas A&M University System, Dallas, TX 75252, USA
4. Department of Agricultural and Biosystems Engineering, North Dakota State University, Fargo, ND 58102, USA