Fig. 1From: Humic acids and Herbaspirillum seropedicae change the extracellular H+ flux and gene expression in maize roots seedlingsa Dry mass and b length of maize root seedlings treated with 50 mg C L−1 humic acid (HA), Herbaspirillum seropedicae (Bac) or 50 mg C L−1 humic acid and H. seropedicae (HA + Bac) for 7 days in hydroponic culture. Data were analyzed by one-way ANOVA combined with Tukey’s test at P < 0.05 (n = 4)Back to article page