Fig. 4

Percentage of improvement obtained by the best combination obtained in the pH, salinity, and iron experiment (treatment T8), in combination with seed pretreatment for five days in darkness immersed in 800 mM saline solutions of NaCl, in comparison to the untreated control for the different locations tested: M₁ (Sebkhet Cherita), M₂ (Agareb coast), M₃ (Kraten), M₄ (Tinto River estuary), M₅ (Rábida) and M₆ (San Juan del Puerto). The asterisk indicates means within an analyzed variable that is significantly different from the corresponding control treatment (t-Student; level of significance (p < 0.05))