The lowest Zn and Cu concentrations were found in the leaves of
plants grown in the reference soil in both crops (Fig. 2). In the first
crop, the Zn concentration in the leaves of the plants grown in the
vineyard soil without Zn addition was 20.7 times lower than in the
270 mg Zn kg−1 treatment. The Cu concentrations in the maize plant
leaves remained below 20 mg kg−1 in all the treatments. In the second
crop, the Zn concentrations in the leaves of plants grown in the soilwith
high Cu concentrations and without the application of Zn were 11.9
times lower thanwhen the greatest dose of Znwas applied. The highest
Cu concentrations in the second crop were found in the leaves of plants
grown in the vineyard soil without the addition of Zn. The highest Cu
and the lowest Zn accumulation in shoot biomass was observed in the
vineyard soil without Zn application (0.12 and 0.75 mg pot−1 of Cu
and Zn, respectively). In the treatment with 270 mg Zn kg−1, however,
the Cu and Zn accumulation in shoot biomass was about 0.04 and
4.76 mg pot−1, respectively.