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Lateritic soils of Kerala, India: their mineralogy, genesis and taxonomy

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Title Lateritic soils of Kerala, India: their mineralogy, genesis and taxonomy
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Creator Chandran, P., Ray, S.K., Bhattacharyya, T., Srivastava, P., Krishnan, P. and Pal, D.K.
 
Subject lateritic soils (Ultisols) genesis, mineralogy class, Soil Taxonomy, India.
 
Description Not Available
In this study, we report the chemical and mineralogical characteristics of 4 benchmark Ultisols of Kerala to elucidate their genesis and taxonomy. The taxonomic rationale of the mineralogy class of Ultisols and other highly weathered soils on the basis of the contemporary pedogenesis is also explained. The Ultisols of Kerala have low pH, low cation exchange capacity, low effective cation exchange capacity and base saturation, with dominant presence of 1 : 1 clays and gibbsite. Presence of gibbsite along with 2 : 1 minerals discounts the hypothesis of anti-gibbsite effect. Since the kaolins are interstratified with hydroxy-interlayered vermiculites (HIV), the formation of gibbsite from kaolinite is not tenable. Thus, gibbsite is formed from primary minerals in an earlier alkaline pedo-environment. Therefore, the presence of gibbsite does not necessarily indicate an advanced stage of weathering. On the basis of a dominant amount of gibbsite, a mineralogy class such as allitic or gibbsitic does not establish a legacy between the contemporary pedogenesis and the mineralogy. The dominance of kaolin—HIV in the fine clays of Ultisols and their persistence, possibly since early Tertiary, suggests that 'steady state' may exist in soils developed on long-term weathered saprolite. Since the present acid environment of Ultisols does not allow desilication, the chemical transformation of Ultisols to Oxisols with time is difficult to reconcile as envisaged in the traditional model of tropical soil genesis.
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Date 2020-06-11T13:37:07Z
2020-06-11T13:37:07Z
2005-01-31
 
Type Research Paper
 
Identifier Chandran, P., Ray, S.K., Bhattacharyya, T., Srivastava, P., Krishnan, P. and Pal, D.K. (2005). Lateritic soils of Kerala, India: their mineralogy, genesis and taxonomy. Australian Journal of Soil Research 43:839-852
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http://krishi.icar.gov.in/jspui/handle/123456789/37048
 
Language English
 
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Publisher Not Available