B.O. Al- Jaff 2024. USING CENTER OF GRAVITY EQUATION FOR MICA AND SMECTITE IN EVALUATION OF K-STATUS IN SOME SOILS OF IRAQI KURDISTAN REGION. IRAQI JOURNAL OF AGRICULTURAL SCIENCES. 55, 3 (Jun. 2024), 1110–1119. DOI:https://doi.org/10.36103/w953r397.