WIVO TIARA NOVIO; ADRINAL; IKHSAN, Zahlul. The Effect of Volcano Ash and Goat Manure on The Growth of Robusta Coffee (Coffea canephora) Seedlings . Jurnal Riset Perkebunan, [S. l.], v. 7, n. 1, p. 37–50, 2026. DOI: 10.25077/jrp.7.1.37-50.2026. Disponível em: https://jrp.faperta.unand.ac.id/index.php/jrp/article/view/148. Acesso em: 28 sep. 2026.