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 fruitbunches (EFB). It was placed along the oil palm plantations. The condition was not onlythe trigger of air pollution but also could invite rhinoceros beetle pests (Oryctesrhinoceros) to lay their eggs and carry out reproductive activities due to availabilityorganic 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 slowavailable because of its relatively long breakdown. That was the reason why it was neededa method of using EFB waste into a capable of high use value product, environmentallyfriendly, and could give a lot of benefits to oil palm farmers. The purpose of this studywas to determine the availability of nutrient content in EFB composting by the using ofsymbiont bacteria from larvae O. rhinoceros. The research was experimentally conducteda factorial randomized block design (RBD) with 2 factors, namely the type of bacteria andthe time of decomposition. The composting stage was carried out by coarsely choppingthe EFB then 75 ml of bacterial culture was applied to 1 kg of EFB. Analysis, resultsindicated C/N ratio (35.56% and 36.97%) and high K content (1.64% and 1.48%). TheEFB composting method is achievable in 6 weeks with activators of Bacillusstratosphericus and Bacillus siamensis.