Abdalla, Y. H., Majid, A. A., & Abdelnaby, O. H. (2016). The effect of nitrification inhibitors and sulfur on the efficiency of nitrogen fertilizers added to calcareous soil on barley plant in El-Jabal El Akhdar region. Al-Mukhtar Journal of Sciences, 31(2), 55–64. https://doi.org/10.54172/mjsc.v31i2.281