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. 2018 Jul 20;9:1028. doi: 10.3389/fpls.2018.01028

FIGURE 4.

FIGURE 4

(A) Leaf and (B) root dry weight of Zea mays plants grown for 12 days in Hoagland modified nutrient solution and supplied for 2 days with HA extracted from control amendment (Amd-C) and olive mill water filter plus MSW pre-treated OMWF at 0.5 or 1 mg C L-1. Data represent the means of three measurements with five plants in each (±SD). Values are reported as percentage of leaf and root dry weight variation relative to the control (=100%). Different letters above bars indicate significant differences between treatments at P < 0.05 according to Student–Newman–Keuls test.