Mineralogical Characterization of Potassium-Bearing Clay Minerals and Their Implications on K Availability in Calcareous Soils of Sulaymaniyah, Kurdistan: Mineralogical Characterization of Potassium-Bearing Clay Minerals and Their Implications on K Availability in Calcareous Soils. Acad. J. Int. Univ. Erbil. 2026;3(2):1120-1128. doi:10.63841/iue3261120