URDANETA, Leonila A.; JAVIER, Reynaldo R. EFFECTS OF IPIL-IPIL AND AMMONIUM SULFATE AS NITROGEN SOURCES OF SWEET POTATO. Annals of Tropical Research, [S. l.], v. 2, n. 2, p. 122–128, 1980. Disponível em: https://atr.vsu.edu.ph/article/view/832. Acesso em: 5 dec. 2025.