The Role of Spent Oyster Substrate Supplemented with Biological Factors and spraying with Spent substrate extract on some Vegetative Growth Characteristics of Cowpea (Vigna unguiculata L.). Euphrates journal of agricultural science, [S. l.], v. 18, n. 3, 2026. Disponível em: https://ejs-agri.com/index.php/EJAS/article/view/431. Acesso em: 3 nov. 2026.