Objective of the research was to create bio-activator as decomposer in empty recemus of oil palm. The research was conducted for two years, however, in the first year, two types of bio-activators were made of different materials using fruit’s wastes and banana’s capitulum. Then, the organic fertilizers were made of empty recemus of oil palm by the assistance of bio-activator. In the second year, the organic fertilizers were applied on the cropland of soybean plots. Such bio-activator was taken the banana plant, in which the fruits had been taken (harvested), while the fruit’s wastes were obtained from the fruit’s sellers. The bio-activator was made at the Laboratory of Agronomy, State Polytechnics of Agriculture, Samarinda. Such bio-activator was made through fermentation. A ton of empty recemus was taken from waste of the oil palm’s mill. Such empty recemus were chopped and given the bio-activator evenly, and then fermented until they are ready to be used. Results of the research on tankos compost from MOL of fruits showed low nutrients level, such as : N 0.25 %, P2O5 0.19 % , K2O 0.82 %, MgO 0.22 %, Pb 188.74 %, Ca 6. 29 %, Cu 33.56 %, Zn 57.40 %, Fe 1744.60 % , Mn 72.42 % and result of tankos compost from MOL of banana’s capitulum have still showed relatively low nutrients level, such as : N 1.25 %, P2O5 0.27 %, K20 0.94 % , MgO 0.23 %, Pb 425,66 %, Ca 6.95%, Cu 27.52 % , Zn 59.49 % , Fe 3593.20 % , Mn 77.95%. Results of the bacterial identification on MOL of fruits and MOL of banana’s capitulum showed one type of bacteria for fruit MOL, such as Bacillus sp., and the banana’s capitulum MOL, such as Enterobacter sp.
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