State the types of soil of India and give detailed information of any three.
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3 types of soil are
1 )
Alluvial soil:
Mostly available soil in India (about 43%) which covers an area of 143 sq.km.
Widespread in northern plains and river valleys.
In peninsular-India, they are mostly found in deltas and estuaries.
Humus, lime and organic matters are present.
Highly fertile.
Indus-Ganga-Brahmaputhra plain, Narmada-Tapi plain etc are examples.
They are depositional soil – transported and deposited by rivers, streams etc.
Sand content decreases from west to east of the country.
New alluvium is termed as Khadar and old alluvium is termed as Bhangar.
Colour: Light Grey to Ash Grey.
Texture: Sandy to silty loam or clay.
Rich in: potash
Poor in: phosphorous.
Wheat, rice, maize, sugarcane, pulses, oilseed etc are cultivated mainly.
2)
Red soil:
Seen mainly in low rainfall area.
Also known as Omnibus group.
Porous, friable structure.
Absence of lime, kankar (impure calcium carbonate).
Deficient in: lime, phosphate, manganese, nitrogen, humus and potash.
Colour: Red because of Ferric oxide. The lower layer is reddish yellow or yellow.
Texture: Sandy to clay and loamy.
Wheat, cotton, pulses, tobacco, oilseeds, potato etc are cultivated.
3) Black soil / regur soil:
Regur means cotton – best soil for cotton cultivation.
Most of the Deccan is occupied by Black soil.
Mature soil.
High water retaining capacity.
Swells and will become sticky when wet and shrink when dried.
Self-ploughing is a characteristic of the black soil as it develops wide cracks when dried.
Rich in: Iron, lime, calcium, potassium, aluminum and magnesium.
Deficient in: Nitrogen, Phosphorous and organic matter.
Colour: Deep black to light black.
Texture: Clayey.