Al-Nomair ع.ع. and Al-Haddi ع.م. 2025. The Effect of Different Levels of Potassium Fertilizer on Growth and Productivity of Arabica Coffee (Coffea Arabica L.) in Ibb City. University of Aden Journal of Natural and Applied Sciences. 29, 1 (Dec. 2025), 11–18. DOI:https://doi.org/10.47372/uajnas.2025.n1.a02.