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Pedogenesis of spatially associated red and black soils in Purna valley from semi-arid region of Central India

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Title Pedogenesis of spatially associated red and black soils in Purna valley from semi-arid region of Central India
Not Available
 
Creator P. Raja,
B.P. Bhaskar,
U. Surendran
, K. Rajan
Santosh Kumar Sarkar,
D.B. Malpe,
M.S.S. Nagaraju
 
Subject Purna valley Polygenetic soils Geochemical characterization Chemical index of alteration
 
Description Not Available
Eight representatives spatially associated red and black soils in Purna valley from the semi-arid region of Central
India were studied through mineralogical, micromorphological and geochemical investigations to infer pedogenic
transformations during changing climatic phase. The morphology of soils showed that dissected alluvial
plains over the basaltic landforms consists predominantly of dark reddish brown to dark yellowish brown soils
with iron/calcium carbonate nodules (Typic Haplustepts), and lithological discontinuities (Typic Ustifluvents)
whereas, pediplains and alluvial plains have clayey, dark brown, sodic, slickensided (Bss) horizons enriched with
CaCO3 nodules (Typic Haplusterts). Buried Natrustalf on alluvial fans and floodplains has strong brown natric
(Btn) horizons with distinct ferriargillans and abundant CaCO3 nodules. Ferriargillans in Alfisols indicates
prevalence of humid climatic phase in the past during which alteration of plagioclase feldspars to smectites could
have occurred, thereafter termination of humid phase and an onset of semi-arid climatic phase had favored drier
non-leaching environment which has resulted in the preservation of smectites in Vertisols. The randomness in
soils are expressed as entropy index which showed that physical mixing in subgroups of Vertisols and sodium
enriched argrillic horizons in Alfisols were the indicators of altered pedogenesis at steady state. The formation of
CaCO3 (pedogenic carbonates) and the concomitant development of sodicity during arid climatic phase were
indicators of strong alkalinity and base accumulation in soils as a mark of aridity in red and black soils of the
valley. The chemical index of alteration, weathering index, and entropy index were served as good indicators for
assessing intensity of chemical weathering rate with respect to hydrology and topography. The study demonstrates
that how the morphological, physical, chemical, mineralogical and micromorphological data were useful
in assessing pedogenetic processes in spatially associated red and black soils of Purna valley
Not Available
 
Date 2020-06-12T09:31:39Z
2020-06-12T09:31:39Z
2018-02-09
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/37111
 
Language English
 
Relation Not Available;
 
Publisher Not Available