1. Tidewater Agricultural Research and Extension Center, School of Plant and Environmental Sciences, Virginia Tech, Suffolk, VA 23437, USA
2. Blackland Research and Extension Center, Texas A&M AgriLife Research, Temple, TX 76502, USA
3. United State Department of Agriculture-Agricultural Research Service, Stillwater, OK 74075, USA
4. Texas A&M AgriLife Research, Lubbock, TX 79403, USA
5. Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409, USA