Fig. 2.
Radar chart of the relative response of plant growth parameters (a, c, e, g) and Two-way ANOVA of plant growth index (PGI) (b, d, f, h) in E. tereticornis (ET) (a, b), E. urophylla (EU) (c, d), E. grandis (EG) (e, f), and E. urophylla × E. grandis (EU × EG) (g, h), respectively. Values are averages ± standard errors (n = 4). The P-values for aluminum (Al), silicon (Si) and their interaction (Al × Si) were based on a Two-way ANOVA. Plant growth parameters included height (H), above-ground biomass (AGB), below-ground biomass (BGB), leaf area (LA), leaf thickness (LT), total root volume (RV), total root length (RL). Lowercase letters indicate that the effect is significantly different on different Si treatments in the same Al treatment, and uppercase letters indicate that the effect is significantly different on different Al treatments in the same Si treatment. Same as follows
