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Root elongation rate at different levels of Al supply under well-watered conditions (A) and at different levels of soil water potentials in the absence of Al application (pH 6.5) (B). Two-day-old seedlings were grown in soil for 24 h. Bars represent means ±SD, n=12. Means with different letters are significantly different at P < 0.05 (Tukey test) for the comparison of treatments. NG, no growth.
