Wivo Tiara Novio, Adrinal, & Ikhsan, Z. (2026). The Effect of Volcano Ash and Goat Manure on The Growth of Robusta Coffee (Coffea canephora) Seedlings . Jurnal Riset Perkebunan, 7(1), 37–50. https://doi.org/10.25077/jrp.7.1.37-50.2026