Biostimulant Potential of Acetic Acid Under Drought Stress Is Confounded by pH-Dependent Root Growth Inhibition.

Growth media type × acetic acid was weakly significant ( p = 0.05–0.1), specifically with 38 mM [HAc] + [Ac – ] significantly ( p < 0.05) reducing both root and shoot length in peat, compared to the 0 mM controls, whereas in the potting mix 47 mM was required to significantly stunt even the root growth ( Figures 5A,C ).

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