WILLIAMS. K. ATAKORA. Cowpea Yield as Affected By Level and Time of Mineral Phosphorus Fertilizer Application in the Guinea Savanna Agro-Ecological Zone of Ghana. Global Journal of Science Frontier Research, [S. l.], v. 14, n. D8, p. 13–17, 2014. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/1403. Acesso em: 6 may. 2024.