All of the experiments were carried out with at least three
independent replications. The statistical package SAS (The SAS
system for windows Version 6.12) was used to determine significant
differences between the cultivars and among the Al treatments
at the P < 0.05 level. The data were analyzed by one-way
analysis of variance followed by an adequate post-hoc test of
significance of difference using SPSS11.5 software.