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Upper graphs show the effect of applying HexaFrass (3 g per pot) to the shoot dry weight (mean ± SE) of PRG and Timothy in four independent glasshouse trials (Trials #1-#4; T1-T4). p-values were obtained using unpaired t-test: * p < 0.05; ** p < 0.01; *** p < 0.001. Lower graphs show effect sizes (Hedge’s g ± 95% CIs) for each trial (T1–T4) and the combined fixed (Fix) and random (Ran) effect size estimates obtained using a REML meta-analysis procedure.
