Fig. 5

Enzyme activities in artificially Zn-contaminated soil treated with chelating agents. a Dehydrogenase (DHA), b n-acetyl-β-d-glucosaminidase (NAG), c β-glucosidase (GLU), d urease (Ure), e phosphatase (Phos), f arylsulfatase (ARS) in experimental variants (Table 2). Mean values (n = 27) in columns marked with same letters are not statistically significantly different (Tukey’s test, p ≤ 0.05), error bars = standard deviation