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Geochemical Interpretations of Laterite Associated Soils of East Coast Andhra Pradesh

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Title Geochemical Interpretations of Laterite Associated Soils of East Coast Andhra Pradesh
Not Available
laterite associated soils
 
Creator Bhaskara Phaneendra Bhaskar1* and Gopal Tiwari2
 
Subject Ferruginous soils, Nellore schist belt, Somasila project, Weathering indices
 
Description Not Available
Six representative laterite associated soils on peneplains of
somasila project area of Nellore district, Andhra Pradesh of
archean age schists under hot semiarid climate were studied
to trace out pedogenic characteristics limiting crop
production. The morphology of these soils showed that a
distinct dark yellowish red to red matrix with hue 7.5YR in
Allimadugu (P1) to red with hue 2.5YR in Venkateshwara
Palem(P2) with increasing intensity of redness and clay in B
horizons. These soils were assessed as easily susceptible to
erosion as evidenced with increasing trends of silt to clay
ratio, structural stability index and the molar ratio’s of silica
to sesiquioxide ratio more than 2. The chemical balance
sheets constructed using silica as invariant and the results
showed that there is a considerable gain of iron, aluminium
oxides and substantial losses of Ca, Mg and K oxides in the
genetic B horizons. These soils were classified in the
subgroups of Entisols, Inceptisols and Alfisols considering
clay illuviation, per cent base saturation, lithic contact and
ustic soil moisture regime. The ratio of dithionite iron to total
iron showed high degree of lateritization in relation to field
morphology but yielded poor relation with weathering
indices such as MPWI (modified product weathering index),
chemical index of alteration (CIA) and Parker index (PI).
These slightly acid to neutral soils were evaluated as
marginally suitable for ground nut, and sorghum with poor
status of carbon to nitrogen ratio(
Not Available
 
Date 2020-05-20T02:30:18Z
2020-05-20T02:30:18Z
1001-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/35837
 
Language English
 
Relation Not Available;
 
Publisher Not Available