B.O. AL- JAFF. 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, [S. l.], v. 55, n. 3, p. 1110–1119, 2024. DOI: 10.36103/w953r397. Disponível em: https://jcoagri.uobaghdad.edu.iq/index.php/intro/article/view/1996. Acesso em: 7 apr. 2025.