TY - JOUR JF - JSTNAR JO - jwss VL - 18 IS - 68 PY - 2014 Y1 - 2014/9/01 TI - Kinetics of Nonexchangeable Potassium Release in Relation to Clay Mineralogy in Some Calcareous Soils of Kohgilouye Province TT - سینتیک آزادسازی پتاسیم غیرتبادلی در ارتباط با کانی‌شناسی رس برخی از خاک‌های آهکی استان کهگیلویه N2 - Rate of nonexchangeable K release can significantly influence K availability. Kinetics of K+ release was studied by extraction using 0.01 M CaCl2 in 12 surface calcareous soils of Kohgilouye Province. Results showed that cumulative K release ranged from 89.9 to 460.9 mg kg-1(Average 195.4 mg kg-1). Calcium carbonate, nonexchangeable K, cation exchange capacity and mica showed a significant correlation with K release. Maximum of potassium release was observed in Alfisols, probably because of high amount of clay content and the clay mineral of mica. The amount of K release was in the following order: Alfisols> Entisols> Inceptisols. Elovich, parabulic diffusion and power function equations could reasonably describe the K release kinetics. Fitting the data to these equations indicated that release of K is controlled by diffusion process. SP - 99 EP - 110 AU - Owliaie, H. R. AU - Heydarmah, S. AU - Adhami, E. AU - Najafi Ghiri, M. AD - Yasouj Univ., Yasouj, Iran. KW - Potassium release KW - Clay mineral KW - CaCl2 KW - Kinetics equations. UR - http://jstnar.iut.ac.ir/article-1-2780-en.html ER -