Table 2.

Total content of Cu, Fe, Zn and Mn in cucumber leaves (µmol per shoot). Plants were harvested after 5 days of treatment with excess Cu (Cu), excess Cu and Si supply (Cu + Si), excess Cu and additional Fe supply (Cu + Fe) or combined excess Cu and additional Fe and Si supply (Cu + Fe + Si); control plants (C) remained untreated.

Treatment	Microelement Content (µmol Per Shoot)
	Cu	Fe	Zn	Mn
C	0.042 ± 0.001 a	0.460 ± 0.010 c	0.308 ± 0.027 d	0.199 ± 0.002 e
Cu	0.081 ± 0.003 c	0.168 ± 0.034 a	0.113 ± 0.008 a	0.068 ± 0.001 a
Cu + Si	0.079 ± 0.003 c	0.235 ± 0.021 ab	0.156 ± 0.020 b	0.090 ± 0.007 b
Cu + Fe	0.047 ± 0.004 ab	0.269 ± 0.008 b	0.159 ± 0.009 b	0.114 ± 0.009 c
Cu + Fe + Si	0.050 ± 0.001 b	0.401 ± 0.057 c	0.193 ± 0.017 c	0.142 ± 0.012 d 1

¹ The values are means of four replicates ± SD. Different letters indicate significant differences among the treatments at p < 0.05.