FIGURE 2.

Leaf rubidium concentration in mature (leaves that had reached final size) and immature (developing leaves) leaves of almond plants following a 7 days Rb uptake period in plants precultured in nutrient media provided with 5 or 124 μg g^–1. Multiple mean comparison was performed using Dunnett’s test choosing foliar control plants as the control level at α = 0.05, n = 20. This analysis was performed separately for plants provided with 5 and 124 μg g^-1. Asterisks denote significant differences between foliar treatments among the same soil potassium treatment.