VÉLEZ-RAMOS, A.; MUÑOZ, M. A. A survey of the pH status and related fertility factors of sugarcane fields of Puerto Rico. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 75, n. 3, p. 213–222, 1991. DOI: 10.46429/jaupr.v75i3.3589. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/3589. Acesso em: 28 jun. 2022.