1. Dep. of Crop, Soil and Environmental Sciences; 1366 W. Altheimer Dr., Univ. of Arkansas Fayetteville AR 72704
2. Dep. of Crop, Soil and Environmental Sciences; 115 Plant Sciences Building, Univ. of Arkansas Fayetteville AR 72701
3. Univ. of Arkansas; Rice Research Extension Center; 2900 Hwy 130 East Stuttgart AR 72160