1. Conservation & Production Research Laboratory; USDA-ARS; PO Drawer 10 Bushland Texas 79012
2. Department of Biological and Agricultural Engineering; Texas A&M University; College Station Texas 77843
3. Department of Biological and Agricultural Engineering; Texas A&M AgriLife Research and Extension Service; Lubbock Texas 79403
4. Department of Biological and Agricultural Engineering; Texas A&M AgriLife Research; Amarillo Texas 79106
5. Dryland Agriculture Institute; Canyon Texas 79016
6. Department of Agriculture; West Texas A&M University; Canyon Texas 79016