Alpha-diversity indices (richness and diversity indices) of soil samples calculated from the bacterial 16S rRNA gene sequence data. OTUs were clustered at 97% similarity level. Comparison of richness (number of OTUs observed) and diversity indices (Chao 1, ACE, Simpson, and Shannon) between control and P. agglomerans inoculated soil samples at time 0 and 15 days. The values are the mean ± SE, n = 3. For each diversity index, ANOVAs followed by the Tukey HSD test was performed; different letters in the same column indicate significant differences (p < 0.05).