UTAMI, S. R.; SUNTARI, R.; AGUSTINA, C.; KUSUMARINI, N. Improving nutrient availability in pyroclastic materials from Mount Kelud using organic and inorganic amendment. Journal of Degraded and Mining Lands Management, Malang, Indonesia, v. 7, n. 1, p. 1987–1993, 2019. DOI: 10.15243/jdmlm.2019.071.1987. Disponível em: https://jdmlm.ub.ac.id/index.php/jdmlm/article/view/606. Acesso em: 21 jun. 2025.