%0 Journal Article %A Owliaie, H. R. %A Heydarmah, S. %A Adhami, E. %A Najafi Ghiri, M. %T Kinetics of Nonexchangeable Potassium Release in Relation to Clay Mineralogy in Some Calcareous Soils of Kohgilouye Province %J Journal of Water and Soil Science %V 18 %N 68 %U http://jstnar.iut.ac.ir/article-1-2780-en.html %R %D 2014 %K Potassium release, Clay mineral, CaCl2, Kinetics equations., %X 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. %> http://jstnar.iut.ac.ir/article-1-2780-en.pdf %P 99-110 %& 99 %! %9 Research %L A-10-1-17 %+ Yasouj Univ., Yasouj, Iran. %G eng %@ 2476-3594 %[ 2014