Uji Antagonis Metabolit Sekunder Isolat Rhizobakteria Kelapa Sawit sebagai Biokontrol Ganoderma sp.: Antagonist Assay of Secondary Metabolite from Oil Palm Rhizobacteria Isolate as Biocontrol of Ganoderma sp. (Jurusan Pertanian Politeknik Pertanian Negeri Samarinda Kampus Sei Keledang Jalan Samratulangi, Kotak Pos 192 Samarinda 75123, 2022)