WIDOWATI, W.; ASTUTIK, A.; SUMIATI, A.; FIKRINDA, W. Residual effect of potassium fertilizer and biochar on growth and yield of maize in the second season. Journal of Degraded and Mining Lands Management, Malang, Indonesia, v. 4, n. 4, p. 881–889, 2017. DOI: 10.15243/jdmlm.2017.044.881. Disponível em: https://www.jdmlm.ub.ac.id/index.php/jdmlm/article/view/306. Acesso em: 24 jun. 2024.