Volume 18, Number 68 (summer 2014)                   JWSS 2014, 18(68): 99-110 | Back to browse issues page


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Owliaie H R, Heydarmah S, Adhami E, Najafi Ghiri M. Kinetics of Nonexchangeable Potassium Release in Relation to Clay Mineralogy in Some Calcareous Soils of Kohgilouye Province. JWSS. 2014; 18 (68) :99-110
URL: http://jstnar.iut.ac.ir/article-1-2780-en.html

Yasouj Univ., Yasouj, Iran.
Abstract:   (5719 Views)
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.
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Type of Study: Research | Subject: Ggeneral
Received: 2014/09/15 | Accepted: 2014/09/15 | Published: 2014/09/15

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