The effect of single and co-inoculation of PSB strains on
soil pH, available P content, and total PSB population are
shown in Table 5. A more significant decrease (P ≤ 0.05)
in soil pH was recorded from PSB-inoculated soils than
uninoculated soils. However, no significant (P ≤ 0.05)
difference in soil pH was observed among single and coinoculated
soils. Furthermore, available P content in the
rhizosphere soil inoculated either by single PSB or both
strains were found to be significantly (P ≤ 0.05) higher
than for uninoculated soil. This was further improved by
adding TCP. The highest available P content (201.25 mg
kg-1 soil) recorded from co-inoculation of PSB strains with
TCP was two times higher than for uninoculated soil. A
remarkable increase in the PSB population was observed
in PSB-inoculated rhizosphere soil when compared with
uninoculated soil. The highest PSB population (8.36 × 106
CFU g-1 soil) recorded from co-inoculation of PSB strains
with TCP was approximately three times higher than for
uninoculated soil.