Red soil is one of the major soil types found in India. It gets its red colour due to the presence of ferric iron oxides (iron compounds) in the rock. Red soil is generally found in regions of low rainfall and is poor in nutrients like nitrogen, phosphorus, and organic matter. It is well-drained and porous. Red soil is found mainly in Peninsular India.
Red soil gets its red colour from ferric iron oxides (Fe₂O₃) in the parent rock.
Found mainly in: Tamil Nadu, AP, Telangana, Chhattisgarh, Jharkhand, Karnataka.
Poor in nitrogen, phosphorus, and organic matter; rich in iron and potash.
Well-drained and porous; not water-retentive.
Best crops: millets (ragi, jowar), pulses, groundnut; cotton and tobacco also grown.
NCERT Class 10 Geography Chapter 1 — Resources and Development.
Why is Red Soil Red? • Red colour due to diffusion of iron (ferric oxide / Fe₂O₃) in ancient crystalline rocks • The red colour is due to iron-rich parent rocks (metamorphic and granite rocks) • In moist conditions: surface layer appears yellow; in dry conditions: appears red
Characteristics: • Colour: Red to yellowish-red; surface may appear yellow/brown in moist areas • Texture: Sandy to loamy; porous and friable (crumbles easily) • Nutrient content: Poor in nitrogen, phosphorus, and organic matter • Rich in: iron, potash, and aluminium • Drainage: Well-drained; not water-retentive • pH: Generally neutral to acidic
Distribution in India:
| State | Major Red Soil Areas |
|---|---|
| Tamil Nadu | Most of the state |
| Andhra Pradesh & Telangana | Eastern parts |
| Karnataka | Eastern districts |
| Chhattisgarh | Bastar, Bilaspur |
| Jharkhand | Chota Nagpur Plateau |
| Odisha | Southern parts |
| West Bengal | Birbhum, Bankura |
| Madhya Pradesh | Parts of MP |
Crops Grown on Red Soil: • Best suited for: Millets (jowar, bajra, ragi), groundnut, pulses, cotton, tobacco • With irrigation and fertilisers: wheat, rice, sugarcane • Ragi (finger millet) grows well in red soil
Comparison of Major Soil Types:
| Soil Type | Colour | Key Feature | Crops |
|---|---|---|---|
| Alluvial | Light to dark | Very fertile, replenished | Wheat, rice, sugarcane |
| Black/Regur | Black | Retains moisture, self-ploughing | Cotton |
| Red | Red-yellowish | Iron-rich, poor in nitrogen | Millets, pulses |
| Laterite | Red-brown | Heavily leached, poor | Tea, coffee, cashew |
| Desert/Arid | Sandy, light | Low moisture | Drought-resistant crops |
NCERT Reference: Class 10 Geography Chapter 1 — Resources and Development
Red soil gets its red colour from ferric iron oxides (Fe₂O₃) in the underlying crystalline rocks. It is found mainly in Tamil Nadu, Andhra Pradesh, Telangana, Karnataka, Chhattisgarh, Jharkhand, and Odisha. Red soil is poor in nitrogen, phosphorus, and organic matter but well-drained and porous. It is best suited for millets (ragi, jowar), pulses, and groundnut. (NCERT Class 10 Geography, Chapter 1)
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