GEOGRAPHY OPTIONAL – PAPER I
PAGE 18 : SOIL GEOGRAPHY
UPSC / UPPSC Geography Optional
Shaktimatha 369 Learning
1. Meaning of Soil
Soil is the uppermost layer of the Earth’s crust, formed by the weathering of rocks and the decomposition of organic matter. It supports plant growth and sustains terrestrial ecosystems.
Exam Importance: Short notes + map-based questions
2. Factors of Soil Formation (CLORPT)
- Climate – temperature & rainfall
- Living organisms – vegetation & microbes
- Organic matter – humus
- Relief – slope & drainage
- Parent material – rock type
- Time – duration of formation
Mnemonic: CLORPT
3. Soil Profile
- O Horizon – organic matter
- A Horizon – topsoil
- B Horizon – subsoil
- C Horizon – weathered rock
- R Horizon – bedrock
Diagram Mandatory: Soil profile with horizons
4. Types of Soils in India
(a) Alluvial Soil
- Most widespread
- Highly fertile
- Found in Indo-Gangetic plains
(b) Black Soil (Regur)
- Derived from basalt
- High moisture retention
- Ideal for cotton
(c) Red Soil
- Iron-rich
- Low fertility
(d) Laterite Soil
- Formed under high rainfall
- Rich in iron & aluminium
(e) Arid & Desert Soil
- Low humus
- Saline nature
(f) Forest & Mountain Soil
- Acidic
- Thin profile
5. World Soil Classification (Brief)
- Pedalfer
- Pedocal
- Lateritic soils
- Podzols
- Chestnut soils
Note: Mention only when asked; focus on Indian soils.
6. Soil Degradation
Soil degradation refers to the decline in soil quality and productivity due to natural or human-induced factors.
Causes
- Soil erosion
- Deforestation
- Overgrazing
- Excessive irrigation
- Chemical fertilisers
7. Soil Erosion
- Sheet erosion
- Rill erosion
- Gully erosion
- Wind erosion
Indian Example: Chambal ravines
8. Soil Conservation Measures
- Contour ploughing
- Terracing
- Afforestation
- Crop rotation
- Mulching
GS Link: Sustainable agriculture & food security
9. Answer Writing Strategy
- Define soil briefly
- Use CLORPT mnemonic
- Add India map / soil profile diagram
- Link with conservation
Golden Rule: Soil profile diagram + Indian example = high marks
PYQ Orientation
- Factors of soil formation
- Indian soil types
- Soil erosion & conservation
NEXT PAGE
Geography Optional – Page 19:
Human Geography – Population Distribution, Growth & Migration
End of Geography Optional – Page 18
Shaktimatha 369 Learning
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