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.). EJAS [Internet]. 2026 Sep. 30 [cited 2026 Nov. 3];18(3). Available from: https://ejs-agri.com/index.php/EJAS/article/view/431