highly significantP < 0.001
Statistical analysis The ANOVA results revealed that siderophore production by SB10, JC13 and IFM22 was highly significant at pH 7 [F (4, 14) = 62.79, 47.018 and 50.231, respectively; P < 0.001], inoculum volume at 15% [F (4, 14) = 102.0, 50.786 and 53.7, respectively; P < 0.001] and agitation speed at 150 rpm [F (3, 11) = 32.571, 181.778 and 31.720, respectively; P < 0.001].