FIGURE 1.
Shoot dry mass (SDM, in A) and root dry mass (RDM, in B) of sweet orange trees grafted on Swingle (C,E) or Sunki (D,F) rootstocks grown in nutrient solution with varying concentrations of boron [C,D, in mg L-1, left (0.01), center (0.5), and right (5.0) columns] for 130 days. Asterisks compare rootstocks in a given boron concentration, whereas lowercase letters indicate significant difference between boron concentrations in a given rootstock (Tukey test at p < 0.05).