Steven R. Evett¹, Nurit Agam², William P. Kustas³, Paul D. Colaizzi⁴ and Robert C. Schwartz⁴, (1)USDA-ARS, Bushland, TX, (2)Agricultural Research Organization of Israel, Mobile post Negev, , ISRAEL, (3)USDA-ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD, (4)Conservation & Production Research Laboratory, USDA-ARS, Bushland, TX