The present investigation was carried out in 1997 , 1998 , 1999 seasons on
5-years old "Anna" apple trees budded on MM. 106 rootstock and grown in a loamy
sand soil at Desert Development Center (DOC) of the American University in Cairo
(AUC) Sadat Research Station (SRS), EI-Menofeya Governorate. The goal of this
work was to study the effect of four irrigation treatments and three nitrogen levels on
the leaf water status, biochemical aspects and mineral contents. The amount of
irrigation water applied to each tested tree based on soil-matrix-potential in the three
irrigation treatments (11 , 12 and b) , and the control treatment. The main results can be summarized in the following points:          1-     Relative water content (RWC) in the leaves significantly decreased with
decreasing irrigation rate, whereas N level had no significant effect on RWC.          2-     The total chlorophyll content of the leaves significantly increased with increasing
irrigation rate and nitrogen fertilization level.          3-     Decreasing the quantity of irrigation water applied to each tree caused a
significant increase in free leaf proline content especially in la . In addition, there
is no significant effect of N levels on the free leaf proline content generally.          4-     Increasing irrigation rate and N level increased leaf N, P, Ca and Fe but
decreased leaf Mn and Zn in the three seasons of study.          5-     Increasing irrigation rate also increased leaf K and decreased leaf Mn and Cu,
whereas increasing N level increased leaf Cu but decreased leaf Mn and Zn in
the three seasons.          6-     Increasing water stress evidently depressed leaf Fe content but significantly
raised the concentration of leaf Mn, Zn and Cu in all three seasons. Nitrogen
level significantly affected leaf Fe and Cu contents positively but had a negative
effect on leaf Mn and Zn contents.