A significant (P < 0.05) reduction in the pH and a concurrent
significant (P < 0.05) increase in the concentration of the
released P were detected in the broth of the nine phosphate-
solubilizing isolates in PRP-amended broth compared with the
non-phosphate-solubilizing isolate # 5 (Table 1). Proficiency of
PRP solubilization was greatest with isolate # 18 (Table 1).