AUGUSTINE, Boakye Boateng; GODFRE, Wilson. Effect of different phosphorus levels on four cowpea (Vigna unguiculata Walp L.) varieties for grain and fodder yield in Upper East Region of Ghana. Archives of Agriculture and Environmental Science, [S. l.], v. 4, n. 2, p. 242–248, 2019. DOI: 10.26832/24566632.2019.0402018. Disponível em: https://aesacademy.org/journals/index.php/aaes/article/view/aaes-04-02-018. Acesso em: 2 apr. 2026.