SANGTONG, P. Availability Indices of Phosphorus in Paddy Soils . Thai Agricultural Research Journal, [S. l.], v. 4, n. 3, p. 206–211, 1986. Disponível em: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/245212. Acesso em: 1 oct. 2026.