Changes in NBRIP medium pH, microbial growth,
titratable acidity, and soluble P content, released
from inorganic P, due to the addition of single and coinoculation
of bacterial inoculants are shown in Table 1.
Significant (P ≤ 0.05) increments in soluble P content,
titratable acid production, and microbial growth were
observed with PSB inoculation. A significant reduction in
the pH of the PSB-inoculated medium was also observed
as compared with the control where it remained constant
(pH 7). Co-inoculation of two PSB strains showed the
highest phosphate solubilization when compared with
single inoculation. A strong negative correlation between
phosphate solubilization and pH, as well as a strong
positive correlation between phosphate solubilization
and microbial growth can also be observed (Table 2). The
higher amount of P observed in the co-inoculated medium