Spss release 18 for windows

Statistical analyses were performed using SPSS Release 18 for Windows. Significant differences between the values of all parameters were determined at P ≤ 0.05, according to Tukey’s test.

The statistical analysis of the ion concentrations measured in the leaves of plants grown under controlled conditions was carried out with 105 values (5 plants × 7 treatments × 3 analytical replicates). For the field conditions experiment, the analysis involved 180 values (15 plants × 4 treatments × 3 analytical replicates). All values were analysed by one-way analysis of variance (ANOVA), at the 95% confidence level, using the software SPSS Release 18 for Windows (SPSS Inc., Chicago, IL, USA). The statistical significance was considered as *p < 0.05; **p < 0.01; ***p < 0.001; and n.s.—not significant. Also, Duncan's test at p ≤ 0.05 was chosen to determine the significance of differences between treatments. The values presented are means ± s.e.