DA-SOILS LABORATORY, SAN FELIPE, ILAGAN CITY, ISABELA, PHILIPPINES; JOSEPHINE, D.; MARGARET, C. A.; ERNESTO, D. G.; FEVIE, R. A. Fertility assessment and mapping of rice areas under the Magat River Integrated Irrigation System in Isabela, Philippines. International Journal of Agricultural Technology, [S. l.], v. 11, n. 2, p. 581–594, 2015. Disponível em: https://li04.tci-thaijo.org/index.php/IJAT/article/view/6321. Acesso em: 7 aug. 2025.