GeographyICSE Class 10 · Soil Resources

Types of Soil in India: Alluvial, Black, Red and Laterite Soils (ICSE Class 10)

Updated 17 October 2026 · Draft, not yet fact-checked

India has four soil types in the ICSE syllabus. Alluvial soil, deposited by rivers, is the most fertile and grows rice, wheat and sugarcane. Black (regur) soil forms from the weathering of Deccan lava rock and suits cotton because it holds moisture. Red soil forms from weathered crystalline rock, gets its colour from iron oxide and is porous. Laterite soil forms by leaching under heavy rain, is acidic and infertile, and needs manure and lime for tea, coffee and cashew.

Understand Types of Soil in India: Alluvial, Black, Red and Laterite

1. What soil is. Soil is the top layer of the earth's surface made of weathered rock particles, humus (decayed organic matter), water and air. It forms slowly from parent rock under the influence of climate, relief, vegetation and time.

2. Alluvial soil.

Formation: deposited by rivers (and by the sea along coasts) from material eroded upstream.
Distribution: the northern plains from Punjab to West Bengal and Assam; the deltas of the Mahanadi, Godavari, Krishna and Cauvery; the coastal plains.
Composition: rich in potash and lime; poor in nitrogen, phosphorus and humus.
Characteristics: light grey to dark in colour; sandy to clayey loam; porous, easy to plough and very fertile.
Khadar and bhangar: khadar is new alluvium deposited every year on the low flood plains: fine, lighter and more fertile. Bhangar is old alluvium on the higher land above flood level: coarser, darker, with lime nodules (kankar) and less fertile.
Crops: rice, wheat, sugarcane, jute, pulses and oilseeds.

3. Black soil (regur).

Formation: by the weathering of basaltic lava rocks of the Deccan trap, in place.
Distribution: Maharashtra, Gujarat (Saurashtra), western Madhya Pradesh and parts of Karnataka, Telangana and Andhra Pradesh.
Composition: rich in iron, lime, calcium, magnesium, potash and alumina; poor in nitrogen, phosphorus and organic matter.
Characteristics: black, very fine clayey texture; retains moisture for a long time; sticky when wet; develops deep cracks when dry, which aerate the soil (it is "self-ploughing").
Crops: cotton (so also called black cotton soil), sugarcane, wheat, jowar, groundnut and tobacco.
Why suitable for cotton: holds moisture over cotton's long growing season, has lime, potash and calcium, and its cracks allow air in.

4. Red soil.

Formation: weathering of ancient crystalline and metamorphic rocks such as granite and gneiss in areas of low to moderate rainfall.
Distribution: Tamil Nadu, Karnataka, Andhra Pradesh, Telangana, Odisha, Chhattisgarh, Jharkhand and eastern Madhya Pradesh.
Composition: rich in iron and potash; poor in nitrogen, phosphorus, lime and humus.
Characteristics: red because of iron oxide (yellow where hydrated); sandy to loamy, porous and friable, so it drains quickly and holds little water; generally less fertile.
Crops: millets, pulses, groundnut, tobacco and potatoes; with irrigation and fertiliser, rice, wheat and cotton.
Poor water retention is due to the coarse, porous texture; iron oxide only gives the colour.

5. Laterite soil.

Formation: where temperature is high and rain is heavy with alternating wet and dry seasons. Heavy rain leaches (washes down) silica and lime from the top layer, leaving iron and aluminium oxides. "Laterite" comes from the Latin word *later*, meaning brick.
Distribution: hill summits of the Western and Eastern Ghats, the Rajmahal hills, the Vindhyas and Satpuras, and hilly parts of Karnataka, Kerala, Tamil Nadu, Odisha, Assam and Meghalaya.
Composition: rich in iron and aluminium oxides; poor in nitrogen, potash, lime and organic matter.
Characteristics: reddish brown, coarse and porous; hardens on exposure to air (so it makes bricks); acidic and infertile.
Crops: with heavy manuring, tea, coffee, rubber, cashew and coconut. Add manure, nitrogen fertilisers and lime to improve it.

Types of Soil in India: Alluvial, Black, Red and Laterite: key facts

Alluvial soil: Deposited by rivers
Rich in potash and lime
Poor in nitrogen, phosphorus, humus
Rice, wheat, sugarcane, jute
Khadar new and fertile, bhangar old with kankar
Black soil (regur): Weathering of Deccan lava
Clayey, retains moisture, cracks when dry
Rich in iron, lime, potash
Cotton, sugarcane, wheat, jowar, groundnut
Red soil: Weathering of granite and gneiss
Red from iron oxide
Porous, poor water retention
Millets, pulses, groundnut, tobacco
Laterite soil: Heavy rain and leaching
Iron and aluminium oxides
Acidic and infertile
Tea, coffee, rubber, cashew with manure and lime
Regions: Alluvial northern plains and deltas
Black Deccan trap area
Red eastern and southern Deccan
Laterite hill summits of the Ghats

Alluvial	northern plains and deltas
Black	Deccan trap area
Red	eastern and southern Deccan
Laterite	hill summits of the Ghats

How to answer Types of Soil in India: Alluvial, Black, Red and Laterite questions

Answer soil questions by following formation, location, properties and crops in order.

1Name the soil from the clue: river deposits mean alluvial; lava and cotton mean black; iron oxide and granite mean red; leaching and brick mean laterite.
2Give the mode of formation in the exact process word: deposition for alluvial, weathering for black and red, leaching for laterite.
3State the distribution as regions (hill summits for laterite) and the composition as rich in and poor in minerals.
4Describe colour, texture and water retention in one line each.
5Finish with the crops associated and, if asked, how to improve the soil.

Types of Soil in India: Alluvial, Black, Red and Laterite in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Choosing a crop for a new plot

Suppose a farmer inherits three plots: Plot A lies on a river flood plain and has fine, light grey soil that is replenished each flood; Plot B has deep black clayey soil that cracks in summer; Plot C is on a hill top with reddish-brown, hard, acidic soil.

Identify each soil and suggest a suitable crop.

Try it first, then show the solutionSolution

Plot A: alluvial (khadar), suitable for rice or wheat.
Plot B: black soil, which retains moisture, suitable for cotton.
Plot C: laterite, which grows tea or cashew only with manure and lime added.

Answer: A: alluvial, rice or wheat. B: black soil, cotton. C: laterite, tea or cashew with manure and lime.

Memory hook: River, lava, brick: alluvial, black, laterite.

Tricks to remember Types of Soil in India: Alluvial, Black, Red and Laterite

Short memory aids. Say each one aloud once, then use it on a question the same day.

Process words
Alluvial = Deposition, Black = Weathering of lava, Red = Weathering of crystalline rock, Laterite = Leaching.
Use it when: Mode-of-formation questions.
Cotton clue
Moisture + cracks + lime means black soil and cotton.
Use it when: Reason questions on black soil.
Colour clue
Red from iron oxide, black from iron and aluminium compounds, reddish brown for laterite.
Use it when: Colour questions.

Types of Soil in India: Alluvial, Black, Red and Laterite: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Identify the soil · 1 mark · MCQBoard level

The soil formed by the weathering of Deccan lava rocks, that cracks in the dry season, is:
(a) alluvial
(b) red
(c) black
(d) laterite

Try it first, then show the solutionSolution

Weathered basaltic lava gives black (regur) soil.
Cracks in the dry season are a feature of its clayey texture.

Answer: (c) black soil.

Example 2: Khadar and bhangar · 2 marks · Short answerBoard level

Name the two types of alluvial soil and give one difference.

Try it first, then show the solutionSolution

The types are khadar (new alluvium) and bhangar (old alluvium).
Khadar is fine and fertile and renewed by floods; bhangar lies on higher ground, is coarser and has kankar.

Answer: Khadar and bhangar. Khadar is new, fine and more fertile; bhangar is old, coarse and contains kankar.

Example 3: Compare alluvial and laterite soils · 4 marks · Long answerHarder board level

Compare alluvial soil and laterite soil with respect to (a) how each forms, (b) fertility and the reason, (c) the region where each is found, (d) one crop each.

Try it first, then show the solutionSolution

(a) Alluvial: deposited by rivers; laterite: leaching by heavy rain leaves iron and aluminium oxides.
(b) Alluvial is very fertile (rich in potash and lime, renewed by floods); laterite is infertile because nutrients are leached out and it is acidic.
(c) Alluvial: northern plains and deltas; laterite: hill summits of the Western and Eastern Ghats and other hilly areas.
(d) Alluvial: rice or wheat; laterite: tea, coffee or cashew (with manure and lime).

Answer: As listed in the steps.

Example 4: Laterite in detail · 3 marks · Long answerHarder board level

Explain why laterite soil is called so, how leaching produces it, and why it is unsuitable for most crops.

Try it first, then show the solutionSolution

"Laterite" comes from the Latin word for brick, since the soil hardens into bricks when exposed to air.
Heavy rain in a hot climate washes silica and lime down from the top layer (leaching), leaving iron and aluminium oxides.
Leaching also removes nutrients and humus, so the soil is acidic and infertile; it needs manure, nitrogen fertiliser and lime.

Answer: Brick-like when dry; formed by leaching in hot, rainy conditions; infertile because nutrients are washed out.

Example 5: Case reasoning · 5 marks · Long answerHOTS / competency

A cultivator moves from the Ganga plain to a hill in the Western Ghats and finds that crops that grew easily on the plain fail on the hill soil, which is reddish brown, porous, hard when dry and acidic. (a) Name the soil on each place. (b) Give one reason why the hill soil is poor. (c) Suggest one crop and one treatment that will help on the hill soil. (d) Why is the plain soil so fertile?

Try it first, then show the solutionSolution

(a) Plain: alluvial; hill: laterite.
(b) Leaching has removed nutrients and humus, leaving iron and aluminium oxides.
(c) Tea, coffee or cashew; adding manure, nitrogen fertilisers and lime.
(d) River deposition renews the soil every year with fine silt rich in potash and lime.

Answer: (a) Alluvial and laterite (b) Leaching (c) Tea or cashew with manure and lime (d) Yearly deposition of fine silt.

Where students lose marks in Types of Soil in India: Alluvial, Black, Red and Laterite

The slips examiners see most often, and what to write instead.

Mistake: Saying "black soil is fertile" with no reason
The question asks why it suits cotton and the answer must give properties, not a general statement.
Do this: Give moisture retention, lime and potash, and aeration through cracks.
Usually costs: 1 to 2 marks.
Mistake: Reversing khadar and bhangar
New and old are swapped.
Do this: Khadar is new and fertile; bhangar is old with kankar.
Usually costs: 1 mark.
Mistake: Giving states for laterite regions
Laterite is found on hill summits, not whole states.
Do this: Name the Western and Eastern Ghats summits and hill ranges.
Usually costs: 1 mark.
Mistake: Writing "denudation" for black soil
Black soil forms by weathering of lava rock.
Do this: Say weathering of basaltic lava.
Usually costs: 1 mark.

Exam tips

Use the process word each time: deposition (alluvial), weathering (black, red) and leaching (laterite).
Write composition as "rich in ... poor in ..." to cover the minerals.
For regions, write hill summits for laterite and plains for alluvial, not just state names.
Tie a crop to a property, for example cotton to moisture retention.

Practice questions on Types of Soil in India: Alluvial, Black, Red and Laterite

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
Black soil is also called:
(a) khadar
(b) bhangar
(c) regur
(d) laterite
Hint
Black cotton soil.
Answer
(c) regur.
Q2 · 1 mark · MCQBoard level
Soil that is acidic and formed by leaching is:
(a) alluvial
(b) laterite
(c) black
(d) red
Hint
Silica and lime washed out.
Answer
(b) laterite.
Q3 · 2 marks · Short answerBoard level
Name two crops grown in alluvial soil and two states in which it is found.
Hint
Northern plains.
Answer
Crops: rice and wheat (also sugarcane, jute). States: Punjab and West Bengal (also Assam).
Q4 · 2 marks · Short answerHarder board level
Name the parent rocks from which red soil forms and describe its texture and one limitation for farming without irrigation.
Hint
Granite and gneiss.
Answer
Red soil forms from weathered crystalline and metamorphic rocks such as granite and gneiss. It is sandy to loamy and porous, so it holds little water and needs irrigation and fertiliser for better crops.
Q5 · 2 marks · Short answerHarder board level
Why does black soil develop deep cracks in the dry season, and how does this help?
Hint
Clay loses water.
Answer
Its fine clay loses moisture and shrinks, forming deep cracks. These let air into the soil, so it is called self-ploughing.
Q6 · 1 mark · Assertion-reasonHarder board level
Assertion (A): Laterite soil is infertile.
Reason (R): Heavy rain leaches away silica, lime and plant nutrients from its upper layer.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Hint
Why are nutrients lost?
Answer
(a).
Q7 · 4 marks · Long answerHarder board level
Study the data: Soil P is formed by river deposits and is rich in potash and lime; Soil Q is formed in situ from basalt and holds moisture; Soil R is porous, red and found in Odisha and Jharkhand. (a) Identify P, Q, R. (b) Name one crop for each. (c) Which one needs irrigation and fertiliser to grow rice or wheat?
Hint
Use the clues one by one.
Answer
(a) P: alluvial; Q: black; R: red. (b) P: rice or wheat; Q: cotton; R: millets or groundnut. (c) Red soil, as it is porous and less fertile.
Q8 · 5 marks · Long answerHOTS / competency
A region has these properties: formed on hill summits, hardens like brick when exposed, reddish brown and acidic. (a) Name the soil. (b) List two regions where it is found. (c) Explain two steps the cultivator can take to grow coffee on it. (d) Why is it unlike the alluvial soil of the Ganga plain?
Hint
Think of the Ghats.
Answer
(a) Laterite. (b) Western Ghats summits and Eastern Ghats summits (also the Rajmahal hills). (c) Add manure and nitrogen fertilisers; add lime to reduce acidity. (d) Alluvial soil is deposited by rivers and is rich in potash and lime and fertile, while laterite is leached, acidic and low in nutrients.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.Parent rock of black soil?Show answer
Basaltic lava of the Deccan trap.
2.Cause of the red colour of red soil?Show answer
Iron oxide.
3.Meaning of the word "laterite"?Show answer
Brick (from Latin later).
4.Soil of the deltas of the Mahanadi, Godavari, Krishna and Cauvery?Show answer
Alluvial.
5.What are kankar nodules?Show answer
Lime nodules found in bhangar.

Types of Soil in India: Alluvial, Black, Red and Laterite: frequently asked questions

Which is the most fertile soil in India?

Alluvial soil, which is renewed by river deposits and is easy to plough.

Why is black soil called black cotton soil?

It is black in colour and suits cotton because it retains moisture.

How can laterite be made productive?

By adding manure, nitrogen-rich fertilisers and lime.

What is leaching?

The washing down of soluble substances such as silica and lime by heavy rain.