Working Document Series Open Access Water Stress Effect on Yield and Water Use Efficiency of Two Wheat Varieties S.H. Ahmed · A.A. Ali Wheat is one of the first food crops to be domesticated and is a basic stable food in Europe, Asia and Africa. Wheat production is limited by insufficient water especially in the hot dry environments. In the arid and semi-arid regions, whe… RUF-32879 2012 CC BY 4.0 20 May 2014