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The leaf SPAD values, shoot and root dry biomass (mean ± S.E., n = 3) of pot-cultivated maize (4–5 leaf stage, 35 days after sowing) treated with two seed-coating biostimulants (Bio1 and Bio2) in comparison with untreated controls. Different letters (a,b) indicate significant differences between samples according to the Student Newman-Keuls method (SNK) (p ≤ 0.05).
