1. University of Arkansas Division of Agriculture, Southwest Research and Extension Center, Hope 71801
2. University of Arkansas Division of Agriculture, Rice Research and Extension Center, Stuttgart 72160
3. USDA ARS, Southern Plains Range Research Station, Woodward, OK 73801
4. University of Arkansas Division of Agriculture, Livestock and Forestry Research Station, Batesville 72501
5. University of Arkansas Cooperative Extension Service, Little Rock 72204