External and internal critical phosphorus requirements of soybean [Glycine max (L.) Merrill] in three Ghanaian soils. Tropical Agriculture, [S. l.], v. 69, n. 4, 1992. Disponível em: https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/4843. Acesso em: 21 jan. 2025.