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Abstract. Population of phosphate  solubilizing  bacteria in  the liquid  organic  fertilizer  created  from  palm  oil bunches  and pineapple rhizome.Biodiversitas 20: 3315-3321.Palm oil bunches and pineapple rhizomes are abundant in Indonesia, especially in Lampung Province due to widespread agro-industrial  company  and  they  arepotential  to  be  used  as  sources  for  liquid  organic  fertilizer.  This  study  was  aimed  to  reveal microbial population within liquid organic fertilizer (LF) which was developed from palm oil bunches (PB) and pineapple rhizome (PR) and  their  role  as  phosphate  solubilizing  bacteria  (PSB).  The  capability  to  solubilize  phosphate  was  recorded  from  the  clear  zone  area around the bacterial colony which was cultivated on Pikovskaya’s  agar  medium.  The  LF  was  prepared  in  three  kinds  of  conditions, namely aerobic, anaerobic, and facultative anaerobic. Isolation was performed every 3 days until 24 days after incubations. The results showed  that  microbial  population  in  the  LF  from  PR  wassignificantly  higher  than  those  developed  from  PB.  Totally,  791  bacterial isolates  were  obtained  from  the  LF;  490  isolates  were  achieved  from  PR  (153  isolates  from  aerobic,  188  isolates  from  facultative anaerobic,  149  from  anaerobic  conditions)  and  301  isolates  were  collected  from  PB  (96  isolates  from  aerobic,  112  isolates  from facultative  anaerobic,  93  isolates  from  anaerobic  conditions).  In  the  case  of  isolates that  were  gained  from  PB,  166  isolates(55.15%) showed  capability  to  degrade  phosphate and  135isolates  (44.85%) did  not  show  any  capability  as  PSB.  As  for isolates  obtained  from PR,  269  isolates  (54.90%)  had  capability  to  solubilize  phosphate,  meanwhile,  the  other  221  isolates  (45.10%)  did  not  show  anycapability  to  solubilize  phosphate.  Among166 isolates  of  PSB  from  PB,  60  isolates  had  very  low  capability,  55  isolates  had  low capability, 34 isolates had medium capability, 10 isolates had high capability and only 7 isolates had very high capability. Meanwhile, from 269 isolates of PSB obtained from PR, 135 isolates had very low capability to solubilize phosphate, 84 isolates had low capability to solubilize phosphate, 32 had medium capability to solubilize phosphate, 14 isolates had high capability to solubilize phosphate and 4 isolates produced very high capability as PSB. In total, 11 chosen isolates were selected from LF developed from both PB (7 isolates) and PR (4 isolates). Therefore, palm oil bunches and pineapple rhizomes contained PSB that can be used as LF.