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Chemical and Biological Technologies in Agriculture
Fig. 5 | Chemical and Biological Technologies in Agriculture

Fig. 5

From: Challenge of transition: the history of a case study involving tropical fruits polyculture stimulated by humic acids and plant-growth promoting bacteria

Fig. 5

Effect of application of humic acids (HA) and plant-growth promoting rhizobacteria (PGPR) on banana growth: A fruit yield (Mg) per area (ha). B Number of banana bunch per area (ha). C Papaya yield. D Red fruit of passion yield during our consecutive harvest. Gray bars and white bars represent the treatment with HA + PGPB and white bars the control without inoculation. The bars represent the stand error and * and ** is the significance of F test of p < 0.01 and p < 0.05, respectively

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