Soil water content effect to plant water uptake and leaves water content. Drought stress treatment cause decreased water supply and decreased stomata open leading decreased leaves CO2 absorption followed decreasing photosynthesis. Finally, plant growth decreased. Razavizadesh and Ehsanpour (2005) suggested the lack of water cause decreased cell turgor pressure. Turgor pressure was instrumental in determining the size of plant, plant cell enlargement and multiply, stomata closure and leaf development. Forthermore, relative water content decreased up to 50% in B.brizantha compared to 7% in the other species. The corresponding reduction percentages at the second drought period of 65 and 80%, respectively, whereas in B.humidicola and B.dictyoneura were reduced less than 65%. (Guenni et al., 2004