The effect of chelating agents on the Zn-phytoextraction potential of hemp and soil microbial activity

Chemical and Biological Technologies in Agriculture

Table 3 Selected chlorophyll fluorescence parameters in experimental variants (Table 2)

Variant	Fv/Fm	Vj	Vi	Vj/Vi
FK	0.772 ± 0.004 a	0.432 ± 0.006 a	0.743 ± 0.012 a	0.582 ± 0.005 a
FC	0.774 ± 0.006 a	0.473 ± 0.034 a	0.743 ± 0.009 a	0.637 ± 0.039 a
FN	0.771 ± 0.008 a	0.418 ± 0.123 a	0.758 ± 0.003 a	0.551 ± 0.018 a
MK	0.757 ± 0.013 ab	0.434 ± 0.024 a	0.704 ± 0.008 b	0.617 ± 0.288 a
MC	0.729 ± 0.011 b	0.482 ± 0.041 a	0.738 ± 0.008 ab	0.653 ± 0.050 a
MN	0.732 ± 0.008 b	0.453 ± 0.024 a	0.747 ± 0.005 a	0.607 ± 0.033 a

Mean values marked with same letters are not statistically significantly different (Tukey’s test, p ≤ 0.05). Parameters based on chlorophyll a fluorescence are automatically calculated from OJIP curves (Fig. 3). Fv/Fm is maximal quantum yield of photosystem II and is defined by Fv/Fm = (Fm–Fo)/Fm, where Fm is maximal fluorescence, Fo is the minimal fluorescence and Fv is variable fluorescence (Fm−Fo). Vj is the size of wave J in the OJIP curve and Vi is the size of wave I in OJIP curve (Fig. 3.). Fluorescence parameters are given in arbitrary units [a.u.]