Screening and optimization of indole-3-acetic acid production and phosphate solubilization by rhizobacterial strains isolated from Acacia cyanophylla root nodules and their effects on its plant growth

Journal of Genetic Engineering and Biotechnology

Table 4 Effect of different nitrogen sources on the tricalcium phosphate solubilization by the tested rhizobacterial strains

Nitrogen source (0.1%)	*Agrobacterium* sp.		*Phyllobacterium* sp.		*Bacillus* sp.		*Rhizobium* sp.
Nitrogen source (0.1%)	Final pH	P₂O₅ liberated (μg ml^-1)	Final pH	P₂O₅ liberated (μg ml^-1)	Final pH	P₂O₅ liberated (μg ml^-1)	Final pH	P₂O₅ liberated (μg ml^-1)
Ammonium sulfate (control)	5.69 ± 0.02	488 ± 5.65	5.22 ± 0.05	576 ± 6.36	4.65 ± 0.04	782 ± 4.24	4.85 ± 0.04	684 ± 5.65
Sodium nitrate	5.82 ± 0.04	310 ± 2.82	6.21 ± 0.02	250 ± 6.36	5.72 ± 0.02	455 ± 9.19	5.75 ± 0.02	420 ± 9.19
Potassium nitrate	5.85 ± 0.04	302 ± 7.07	6.18 ± 0.04	253 ± 3.53	5.82 ± 0.04	320 ± 12.02	6.22 ± 0.04	235 ± 4.94
Ammonium nitrate	5.74 ± 0.05	420 ± 11.31	4.95 ± 0.04	580 ± 10.6	4.72 ± 0.02	755 ± 5.65	4.92 ± 0.04	588 ± 11.31
Asparagine	6.52 ± 0.04	185 ± 4.94	6.78 ± 0.05	92 ± 8.48	6.90 ± 0.07	68 ± 2.12	6.89 ± 0.21	96 ± 6.36
Urea	6.75 ± 0.05	95 ± 7.07	6.88 ± 0.08	74 ± 7.07	6.95 ± 0.05	44 ± 4.94	6.86 ± 0.02	78 ± 4.94