The pattern of C/N ratio variation was
similar to the change in the TNC in leaves. There
were significant differences in the C/N ratio
throughout the experiment. An increase in the
C/N ratio in all treated trees was found in leaves
just before rewatering and the water stressed trees
had the highest C/N ratio (6.78) but it was not
significantly different from trees in the treatment
involving the PBZ application combined with
water stresses. In contrast, trees treated with the
urea application combined with water stress had
the lowest C/N ratio when compared with other
treatments; then the C/N ratio began to decrease
after rewatering until the flushing period. The
C/N ratio in the control trees decreased slightly
from the beginning until the end of experiment