Fig. 2From: The effect of chelating agents on the Zn-phytoextraction potential of hemp and soil microbial activityInfluence of NTA or CA treatment on chlorophyll a (a) content, chlorophyll b (b) and chlorophyll a/b ratio (c) in plants (Table 2). Mean values in columns marked with same letters are not statistically significantly different (Tukey’s test, p ≤ 0.05), error bars = standard deviationBack to article page