Fig. 5

Available P in bulk soil (a) and in rhizosphere soil (b) as a function of P doses (biochar enriched with Bayóvar rock phosphate) and phosphate-solubilizing bacterial inoculation. Two asterisks indicate significant at p < 0.05. Uppercase letters compare strains within each P dose and lowercase letters compare P doses within each strain by the Scott–Knott test (p < 0.05). Means and standard deviations of four replications. TSP = 200 mg P of triple superphosphate kg^-1 soil