Iwanthika, G., & Seran, T. H. (2023). Yield Response of Cowpea (Vigna unguiculata L.) to Poultry Waste Application With Different Rates of Potassium and Phosphorus Inorganic Fertilizers. International Journal of Environment, 12(2), 71–82. https://doi.org/10.3126/ije.v12i2.65437