Determination and Management of Nutrient-Deficient Irrigated Lowland Rice Soils. WVSU Research Journal, [S. l.], v. 1, n. 1, p. 38–45, 2012. DOI: 10.59460/wvsurjvol1iss1pp38-45. Disponível em: https://journal.wvsu.edu.ph/index.php/journals/article/view/69.. Acesso em: 25 sep. 2007.