Figure 1.

Photosynthetic activity of cabbage outer leaves (o) at 4 weeks after the first treatment and 2.5 weeks after the second treatment: (a) chlorophyll fluorescence, (b) stomatal conductance; Co - control outer leaves, D1o - dose 1 (1 L/ha) outer leaves, D2o - dose 2 (3 L/ha) outer leaves (±error bars, n = 6 for Y(II), and n = 5 for stomatal conductance; significance level α = 0.05. Different letters indicate significant differences between samples; double letters indicate statistical similarities between samples).