Two pot experiments were conducted at the greenhouse of the Educational Farm, King Saud University to study the response of wheat to foliar appticanon of copper; and to evaluate the effect of four levels of phosphorus and
five levels of Cu on wheat yield. In the first study, Wheat was sprayed by copper, applied in the form of CuS04.5H20 at five concentrations namely; 0 ,0.1 ,0.2,0.3,and 0.6°;' The obtained results revealed that wheat grown in the sandy sot! responded to copper sulphate sprays especially when it was applied at a level of 0.3%. Also seeds weight significantly increased. Such increase was associated with an increase in the straw weights However, applying Cu at a level of 0.6% caused insignificant decrease. Nevertheless, application of copper sulphate to the sandy loam soil at a level of 0.6% caused a significant decrease in the weight of straw and seeds. The second study showed that application of P at a rate of 40 mgkg'l and Cu at a rate of 2 mgkg'l achieved the highest response for the dry matter of the shoots and/or roots. However, higher application of Cu, namely at 16 mgkg 1 caused a reduction of dry matter weight. The sale application of Cu or associated with phosphorus had no profound infiuence on the dry matter yields of the roots Copper uptake by the shoots was the highest when P was applied at 4:; rnqkq" together with 2 mgkg" of copper. The results also indicated that P applications had no effect on Cu availability in soil but the opposite held true.