Bacillus stratosphericus from Oryctes rhinoceros larvae as decomposer of oil palm empty fruit bunches

Abstract

The use of oil palm empty fruit bunches (OPEFB) as a source of organic fertilizer in oil palm plantations copes with obstacles. The application of the OPEFB for breeding medium of Oryctes rhinoceros pests from egg stage to pupa and the composting period of organic material reach 12-16 months. In this study, it was found that the utilization of bacterial symbionts of O. rhinoceros larvae namely Bacillus stratosphericus, mixed with Trichoderma sp. And yiest was able to decompose OPEFB for 10 weeks. The resulting compost indicated a pH of 8.46 - 8.76 and a moisture content of 79.39 - 81.74%. The C / N ratio for the treatment of B. stratosphericus + Yeast, the treatment of B. stratosphericus + Trichoderma sp. And the treatment of B. stratosphericus + Yeast + Trichoderma sp. is 17.5, 13.3 and 14.7, respectively.The chemical compounds composition of OPEFB decomposed for 10 weeks with the addition of B. stratosphericus and Trichoderma sp as well as yeast ranged from 25.6 to 30.46% C-org, 1.81-2.07% N, 0.1-0.22% P, 2.54 - 3.68% K and 0.43 - 0.50% Mg.