Whilst being prepared for publication Figure 3 was displayed incorrectly. The correct representation of the figure with caption, is shown below.

Figure 3. Effect of soil type on total biomass of inoculated and non-inoculated (control) Albizia guachapele (a) and Swietenia macrophylla (b) seedlings in the shadehouse experiment. Asterisk indicates a significant difference in the size of uninoculated vs. inoculated plants within a soil type in planned comparison tests.