Fig. 3. Chlorophyll a (a), chlorophyll b (b) and carotenoids (c) on freshmatter (FM) of the first expanded leaf ofmaize plants after 35 days in response to the addition of Zn doses (expressed
as mg kg−1) in a vineyard soil contaminated with Cu. Columns followed by the same letter in each crop show no statistically significant difference according to the Scott–Knott test (P b 0.05).
Positive (+) and negative (−) signs indicate higher and lower values for each Zn doses applied to vineyard soil compared to the reference soil according to theMann–Whitney U-test (P b 0.05).