Abstract:
Phosphate solubilizing bacteria (PSB) is a group of benefical bacteria capable in
solubilizing organic phosphate into anorganic phosphate. Therefore, the application of
PSB as biofertilizer agents can improve plant growth. The objective of this research was
to analyze the effectiveness of PSB mixing inoculation in increasing the growth of
prenursery palm oil seeds in peat soil. This research was designed as Completely
Randomized with five replications. Isolates used in this researched were PSB BB_UB6,
BB_K9, BB_K2, BB_HS13, BB_UB19, BB_UB5 and BB_HP28. The treatment of PSB
was conducted by soaking the oil palm seeds in mixed PSB isolates for 2 hours. Then, the
seeds were grown in prenursery medium that contain of peat and ultisol soil (1:3) for 12
weeks. The observed parameters included crown growth and root growth. The results
showed that the use of PSB were not significantly effect on all parameters, but some
isolates were effective in spurring the growth of root dry weight. Isolates that effective in
spurring the growth of root dry weight are PSB on the starter 1, starter 2, starter 4 and
starter 5 with the precentage of 175%, 100%, 131,25%, and 106,25%.
