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The contents availability of N, P, K, and Mg in empty fruit composting of oil
palms with symbiont bacteria from rhinoceros beetle larvae (Oryctes rhinoceros)
(Coleoptera: Scarabidae)

The using of palm oil waste had not been optimal lately. It could be seen in oil empty fruit
bunches (EFB). It was placed along the oil palm plantations. The condition was not only
the trigger of air pollution but also could invite rhinoceros beetle pests (Oryctes
rhinoceros) to lay their eggs and carry out reproductive activities due to availability
organic matter of the trees. Oil palm plants required large amounts of macro nutrients,
especially potassium. However, the potassium nutrient was found in EFB was too slow
available because of its relatively long breakdown. That was the reason why it was needed
a method of using EFB waste into a capable of high use value product, environmentally
friendly, and could give a lot of benefits to oil palm farmers. The purpose of this study
was to determine the availability of nutrient content in EFB composting by the using of
symbiont bacteria from larvae O. rhinoceros. The research was experimentally conducted
a factorial randomized block design (RBD) with 2 factors, namely the type of bacteria and
the time of decomposition. The composting stage was carried out by coarsely chopping
the EFB then 75 ml of bacterial culture was applied to 1 kg of EFB. Analysis, results
indicated C/N ratio (35.56% and 36.97%) and high K content (1.64% and 1.48%). The
EFB composting method is achievable in 6 weeks with activators of Bacillus
stratosphericus and Bacillus siamensis.