Fig. 6From: The effect of chelating agents on the Zn-phytoextraction potential of hemp and soil microbial activityPearson’s correlation of variables determined with artificially Zn-contaminated soil treated with chelating agents. Values of Pearson’s correlation matrix present correlation coefficient r, statistical significance of results is indicated by symbol(s): ˙p ≤ 0.1, *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001Back to article page