Muhammad, M., Kutawa, A. B., & Adamu, M. (2020). Influence of NPK Fertilizer and Poultry Manure on the Growth of Okra (Abelmoschus esculentus L. Moench) in Northern Sudan Savanna Region of Nigeria. International Journal of Horticulture, Agriculture and Food Science, 4(6). https://journal-repository.com/index.php/ijhaf/article/view/2898