Effect of Soil Minerals on Potassium Release from Soil Fractions by Different Extractants

Kinetics of potassium (K) release from sand, silt, and clay fractions of 10 calcareous soils of southern Iran were examined to evaluate the ability of different fractions to release K. Samples were successively extracted with 0.01 M CaCl₂, HCl, and citric acid for 1496 h. Mineralogical analysis indi...

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Bibliographic Details
Published in:Arid land research and management 2013-04, Vol.27 (2), p.111-127
Main Authors: Najafi-Ghiri, Mahdi, Jaberi, Hamid Reza
Format: Article
Language:English
Subjects:
CaCl
calcareous soils
calcium chloride
citric acid
clay
clay fraction
equations
hydrochloric acid
kinetic models
mica
Mineralogy
Minerals
palygorskite
Potassium
quartz
Reaction kinetics
sand
silt
smectite
soil minerals
Soils
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Summary:Kinetics of potassium (K) release from sand, silt, and clay fractions of 10 calcareous soils of southern Iran were examined to evaluate the ability of different fractions to release K. Samples were successively extracted with 0.01 M CaCl₂, HCl, and citric acid for 1496 h. Mineralogical analysis indicated that mica, chlorite, smectite, and palygorskite were the main minerals detected in the clay fraction. The sand and silt fractions were dominated by quartz, feldspars, and micas. Results indicated that the clay fractions released more K than the silt and sand fractions to all extractants (620, 283, and 148 mg kg⁻¹ for clay, silt, and sand fractions, respectively, averaged for 10 samples and three extractants). The ability of acidic extractants to release K from the sand and silt fractions was much higher than that of CaCl₂ solution. However, this difference was not significant (p 
ISSN:1532-4990
1532-4982
1532-4990
DOI:10.1080/15324982.2012.719571