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The relationship between the effect (Cohen’s d) on plant shoot growth of applying different PGPs (general, animal-derived and seaweed-based) and the NPK content of the applied solutions of PGPs. PGPs were applied as a root drench to low nutrient potting mix. The effect is the weighted mean effect of each PGP tested on multiple plants calculated using REML analysis (see Figure 1b; Supplementary File S2).
