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Influence of layer charge of clay smectites on selected properties of Vertisols

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Title Influence of layer charge of clay smectites on selected properties of Vertisols
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Creator Ray, S.K., Chandran, P., Bhattacharyya, T. and Singh, Babita
 
Subject layer charge, clay, smectites, Vertisols
 
Description Not Available
Transformation of 2:1 layer silicates may involve different processes and pathways. Generally black soils of India are formed from the weathering of basalt to smectite. Oxidation of structural ferrous iron, lattice substitution or protonation of structural oxygens reduce the layer charge of these clays. This results in hydroxy-interlayering of smectites which has been reported to be maximum at the surface and gradually decreases down the depth of Vertisols. It is known that the variation of layer charge affects the soil properties. Therefore the present study has been done to show the variation of layer charge with depth and its relation with some soil properties.

Two benchmark Vertisols, one from Amravati district of Maharashtra (Takarkheda) and the other from Bellary district of Karnataka (Bellary) were chosen for the study. Alkylammonium method was used for determining the layer charge.

The d-values when plotted against the number of carbon atoms of alkylammonium ions show both monolayer to bilayer and bilayer to pseudotrilayer transitions. This indicated that the interlayer space has unsymmetrical charge distribution and there is heterogeneity in the nature of smectite. Charge distribution also shows broadly two types of charges, one higher than the other (Table 1). The heterogeneity of charges may be due to hydroxy-interlayering of smectite and the stacking arrangements of these smectites. Routine XRD analysis shows more hydroxy-interlayering at the surface and decreases down the depth. This is reflected in the layer charge which also decreases in the same order. Moreover, the decrease in layer charge with depth also seems to be related with decrease in COLE and fine clay CEC and increase in pH, ESP and EMP values.
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Date 2020-06-27T01:25:04Z
2020-06-27T01:25:04Z
2004-10-27
 
Type Presentation
 
Identifier Ray, S.K., Chandran, P., Bhattacharyya, T. and Singh, Babita (2004). Influence of layer charge of clay smectites on selected properties of Vertisols, Commission 2.4: Soil Mineralogy ISSS National Seminar and 69th Annual Convention, October27-30, 2004, (Abstract). Pp31
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http://krishi.icar.gov.in/jspui/handle/123456789/37479
 
Language English
 
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