1. a Department of Crop, Soil, and Environmental Science , University of Arkansas, Northeast Research and Extension Center , Keiser , AR , 72351 , U.S.A.
2. b Department of Crop, Soil, and Environmental Science , University of Arkansas , Fayetteville , AR , 72701 , U.S.A.
3. c Lipsey Gin Tech, Inc. , For more detailed information than is possible to provide in this paper, contact, P. O. Box 964, Indianola , MS , 38751 , U.S.A.