THE EFFECT OF ADDING VARIOUS NATURAL MATERIALS TO THE MEDIA ON THE GROWTH OF POTATO EXPLANTS IN VITRO : PENGARUH PENAMBAHAN MACAM BAHAN ALAMI PADA MEDIA TERHADAP PERTUMBUHAN EKSPLAN KENTANG SECARA IN VITRO. JIGA. 2025;2(1):47-55. doi:10.26486/jiga.v2i1.4980