1. (Deceased) Texas A&M AgriLife Research and Extension Center 1102 E. FM1294 Lubbock TX 79403‐6603 USA
2. (Deceased) Texas A&M AgriLife Research and Extension Center 11708 Highway 70 South Vernon TX 76384 USA
3. (Retired) Texas A&M AgriLife Research and Extension Center 1102 E. FM1294 Lubbock TX 79403‐6603 USA
4. Texas A&M AgriLife Research and Extension Center 10345 Agnes St. Corpus Christi TX 78406‐1412 USA
5. Dep. of Soil and Crop Sciences Texas A&M Univ. College Station TX 77843‐2474 USA