Phosphorus fertilizers in Nigerian savanna soils. I-Use of phosphorus sorption isotherms to estimate the phosphorus requirement of maize at Samaru. Tropical Agriculture, [S. l.], v. 54, n. 3, 1977. Disponível em: https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/3081. Acesso em: 22 jun. 2025.