Fig. 2

Phenotypic parameters of FeNP-treated maize plants. a Shoot dry weight; b Root dry weight; c Leaf SPAD index of maize plants after 10 d of growth in hydroponics. Control plants (C); plants grown without Fe (-Fe); plants grown with NPs as a source of Fe (FeNP). Data are means ± S.E. of three independent experiments with three plants each (one-way ANOVA with Tukey’s test, n = 9, three plants for each independent growth experiment, p < 0.05).