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

From: 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

Nitrogen source (0.1%) Agrobacterium sp. Phyllobacterium sp. Bacillus sp. Rhizobium sp.
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