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Climate & Soils of India

RBI Grade B · General Awareness

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Core Concept

Read this first — the foundation of the topic

→India has eight major soil types

Alluvial, Black (Regur), Red and Yellow, Laterite, Arid/Desert, Saline, Peaty/Marshy, and Forest soils. Each soil type develops due to specific climate conditions

💡Key Climate-Soil Relationships

Alluvial soils form in river valleys with moderate rainfall (Ganga-Brahmaputra plains). Black soils develop in Deccan plateau with 50-100cm rainfall, perfect for cotton. Red soils form in areas with 50-150cm rainfall and high temperature. Laterite soils develop in heavy rainfall regions (150cm+) like Western Ghats.

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Exam Patterns

What examiners ask — read before attempting PYQs

→Common question types include

soil-crop matching, climate zone identification, monsoon-related facts, and soil distribution maps. Questions often test cause-effect relationships between climate and soil formation

⚡Shortcut Trick - ALRLS Method

A - Alluvial (Rivers, Rice-Wheat) L - Laterite (Heavy rain, Cashew-Spices) R - Red (Moderate rain, Millets) L - Less rain (Arid soils, Cactus) S - Saline (Coastal, Salt-resistant crops)

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Worked Example

Solve this step-by-step before moving on

1

Step 1

Identify cotton's soil requirement - deep, moisture-retentive, rich in lime and potash

2

Step 2

Match with soil types - Black soil (Regur) has these properties

3

Step 3

Explain climate connection - Black soil forms in Deccan plateau with 50-100cm rainfall

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Step 4

Add location - Maharashtra, Gujarat, Madhya Pradesh Answer: Black soil (Regur) is most suitable for cotton because it retains moisture, is rich in lime and potash, and develops in moderate rainfall areas of Deccan plateau. Common Mistake: Students often confuse laterite soil formation. Remember: Laterite forms due to LEACHING in heavy rainfall areas, making it infertile despite high rainfall. The heavy rain washes away nutrients, leaving only iron and aluminum oxides. Another frequent error is mixing up alluvial soil types. Old alluvial (Bangar) is found in higher areas and is less fertile than new alluvial (Khadar) found in flood plains. For exam success, focus on soil-crop combinations, formation processes, and geographical distribution. Practice map-based questions regularly as they appear frequently in SSC CGL.

🔑 Key Points

India has tropical monsoon climate with three seasons: summer, monsoon, winter
Monsoon brings 80% of annual rainfall during June-September period
Eight major soil types: Alluvial, Black, Red-Yellow, Laterite, Arid, Saline, Peaty, Forest
Black soil (Regur) is ideal for cotton cultivation in Deccan plateau
Alluvial soil covers 40% of India's area, found in Ganga-Brahmaputra plains
Laterite soil forms in heavy rainfall areas but is infertile due to leaching
Red soil is rich in iron oxide, found in areas with 50-150cm rainfall
Climate determines soil formation through temperature, rainfall, and weathering processes

📌 Exam Facts

Alluvial soil covers 40% of India's total geographical area
Black soil is also called Regur soil, derived from Telugu word 'Reguda'
Western Ghats receive 150-400cm annual rainfall, forming laterite soils
Khadar is new alluvial soil found in flood plains, Bangar is old alluvial
Red soil gets its color from iron oxide (Fe2O3) content
India receives 75% of monsoon rainfall from Southwest monsoon
Thar Desert receives less than 25cm annual rainfall, forming arid soils
Sundarbans region has peaty soil with high organic matter content

🚀 60-Second Revision

Remember: ALRLS trick for major soil types and their characteristics
Formula: More rainfall = More leaching = Less soil fertility (except alluvial)
Trap: Laterite soil has heavy rainfall but is infertile due to nutrient leaching
Key fact: Black soil retains moisture and is self-plowing due to clay content
Map tip: Western coast has laterite, Eastern coast has alluvial deposits
Monsoon memory: 80% rainfall in 4 months (June-September) affects soil formation
Crop connection: Match soil color with suitable crops - Black=Cotton, Red=Millets

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Test yourself under real exam conditions

A timed RBI Grade B mock shows exactly how Climate & Soils of India questions appear in the actual paper — and where you lose marks.

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