This study was carried out during 2001 and 2002 seasons on 8 - years old Valencia orange trees budded on Volkamer lemon and Sour orange rootstocks to evaluate vegetative and root growth, Yield, Fruit quality. leaf and root mineral contents and ability of both rootstocks to tolerate salinity as well as ability to transport some heavy metals. The obtained results showed that, Volkamer lemon rootstocks enhanced tree size, tree height, shoot length, number of leaves per shoot, trunk cross-sectional area “TCSAcmh and leaf area than those on Sour orange rootstock. Also trees on Volkamer lemon rootstock produced the highest values of root growth i.e. root length, root density and root dry weight at different depths (30. 60 and 90cm} and distances (50. 100 and 150cm) from tree trunk comparing with those on Sour orange rootstock and both seedling stocks. Valencia orange trees on Volkamer lemon rootstock had lower Na and Cl ions in their leaves and roots and higher levels of proline, carbohydrate and chlorophyll ab and its total value than those recorded for leaves on Sour orange rootstock. Fruit set was higher on Volkamer lemon than of that on Sour orange rootstock. meanwhile fruit drop was higher in May. June, July than on Sour orange rootstock. Valencia orange on Volkamer lemon maximized fruit yield with higher values of fruit length, diameter, volume, weight and juice volume, T.S.S, Acidity, T.S.Siacid ratio and vitamin C than those on Sour orange rootstock. Valencia Leaf N, P, K. Ca. Mg. Fe, Mn, Zn and Cu contents were higher on Volkamer lemon rootstock. 0n the contrary leaf Na and Cl values were higher on Sour orange comparing with those of Volkamer lemon rootstock. Beside, root N, P. K, Fe, Mn, Zn and Cu contents were higher on Volkamer lemon rootstock. but root Ca, Mg, Na and Cl values were only higher on Sour orange rootstock comparing with Volkamer lemon roots. Valencia orange trees on Sour orange rootstock had higher Pb. Cd, Se. Ni and Cr, in their leaves, roots, fruit peel and fruit juice than those on Volkamer lemon rootstock. Therefore. Volkamer lemon as rootstock for Valencia orange seemed to be a good substitute comparing with Sour orange rootstock under the conditions of this experiment.