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Forms of K as a function of clay mineralogy and soil development

Published online by Cambridge University Press:  09 July 2018

K. Nabiollahy ,
F. Khormali ,
K. Bazargan  and
SH. Ayoubi
K. Nabiollahy
Affiliation:
Department of Soil Science, College of Agriculture, Gorgon University of Agricultural Sciences and Natural Resources, Gorgan, Iran
F. Khormali*
Affiliation:
Department of Soil Science, College of Agriculture, Gorgon University of Agricultural Sciences and Natural Resources, Gorgan, Iran
K. Bazargan
Affiliation:
Soil and Water Research Institute of Iran, Tehran
SH. Ayoubi
Affiliation:
Department of Soil Science, College of Agriculture, Gorgon University of Agricultural Sciences and Natural Resources, Gorgan, Iran
*
*E-mail: Khormali@yahoo.com
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Abstract

The relationships between different pools of K, i.e. exchangeable, HN03-extractable, mineral and total, were investigated as a function of clay mineralogy and soil development in soils of Kharkeh Research Station, Kurdestan Province, western Iran. Samples from different horizons often pedons were selected and analysed for clay mineralogy and K fractionation. X-ray diffraction patterns revealed that clay minerals in the soils studied were similar in type, while their abundances were different. The smectite content was significantly greater in Vertisols than in the other soils. The results of K fractionation showed that mineral K and HN03-extractable K (exchangeable and nonexchangeable, respectively) and the clay content of the soils containing lesser illite (10–30%) were significantly different from those with more illite (30–50%). Moreover, the regression slopes between water-soluble and NE4OAc-extractable K were lower in soils with more smectite due mainly to the presence of larger specific surface areas for K sorption in smectitic soils. Based on soil evolution and different forms of K, the soils studied were grouped in two major categories: (1) Vertisols and (2) Entisols, Inceptisols and Mollisols. There were greater contents of all forms of K in Vertisols than in the other soil orders. This was mainly related to the greater clay content and the dominance of smectite in the clay fraction of Vertisols.

Keywords

clay mineralspotassiumsoil developmentIran
Type
Research papers
Information
Clay Minerals , Volume 41 , Issue 3 , September 2006 , pp. 739 - 749
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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