Soluble-P content and RP-solubilization ability (RP solub.) of bacterial strains in NBRIP liquid media with NH₄⁺ or NO₃^- as the sole N source after 7 days of culture.

Data are given as means ± standard error (n = 3). The same lowercase letters in each column indicate a lack of significance (p<0.05) among the different bacterial strains.