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Iron Oxide Mineral of Associated and Black Soils of Northern Karnataka

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Title Iron Oxide Mineral of Associated and Black Soils of Northern Karnataka
 
Creator Sangamesh N.Prabhakar
 
Contributor B.Basavaraj
 
Subject Seed Science and Technology
 
Description Six soil profiles from three sites of North Karnataka viz., Main Agricultural Research
Station, Dharwad in Dharwad district, Bheemarayanagudi in Gulbarga district and Mantagani
in Haveri district were collected. Chemical and mineralogical properties of these pairs of
associated red and black pedons from Northern Karnataka were studied to understand their
iron oxide minerals. Amorphous and dithionate soluble iron oxide in clay and silt fractions of
different pedons were quantified by chemical methods. Iron oxide minerals in clay and silt
fractions were identified by XRD.
It was revealed that structure in red and black pedons were predominantly sub-angular
blocky. Slickensides were common feature in black pedons.
Soil pH of all the red pedons was slightly acidic to neutral and all the black pedons
were alkaline in pH. Dithionite extractable iron oxide was more in red pedon when compared
to associated black pedons. Oxalate extractable iron oxide was more in red pedons than that
of associated bnlack pedons.
Dithionite soluble component of iron oxide was always higher than the oxalate
soluble iron in all the fractions. Foe/Fed was higher in all fractions of black pedon than red
pedon.
Hematite was identified as a strong crystalline mineral in silt and clay fractions of all
red pedons, goethite was found in silt and clay fractions of Dharwad red pedon. Silt fraction
of mantagani red pedon and clay fraction of Bheemarayanagudi and in black pedon it was
found in only in clay fractions of Dharwad black pedon.
Lepidocrocite was identified in both silt and clay fractions of Mantagani red and black
pedons. Silt and clay fractions of Dharwad black pedon and clay fraction of Dharwad red
pedon and Bheemarayanagudi black pedon. Iron oxide minerals to weathering of soils it
appears that Mantagani red pedon is more weathered than other pedons.
 
Date 2016-10-25T16:29:06Z
2016-10-25T16:29:06Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81935
 
Format application/pdf
 
Publisher UAS, Dharwad