KRUTKUN, T.; BOONDOWN, S. Efficiency of Residual Phosphorus of 16-20-0 Fertilizer in Some Paddy Soils. Agriculture and Natural Resources, Bangkok, Thailand, v. 19, n. 2, p. 100–103, 1985. Disponível em: https://li01.tci-thaijo.org/index.php/anres/article/view/242422. Acesso em: 18 sep. 2026.