Revision summary
A soil profile is the vertical section that stores organic matter, clay, and water. A and B horizons decide nutrient and moisture supply for crops. Alluvium, regur, laterite, and desert soils in India farm differently because their profiles differ. Soil Health Card, 2015, treats that section as a farm input. The statement is correct: agriculture without a profile is guesswork.
Model answer
Introduction
A soil profile is the vertical section from surface litter to parent rock. Agriculture lives in the upper horizons, so the profile decides water, nutrients, and which crop will stand. The statement is correct.
Body
Why the profile matters
- The O and A horizons hold organic matter and available nitrogen; a thin A horizon, as in many eroded red and laterite soils of the peninsula, cannot feed a high-yield cereal without heavy input.
- The B horizon stores clay, iron, and moisture; black cotton (regur) soils of the Deccan have a deep, moisture-retentive profile suited to cotton, sorghum, and rain-fed pulses.
- Depth, drainage, pH, and texture through the profile decide whether paddy, wheat, or horticulture is rational; Indo-Gangetic alluvium has a deep, workable profile that supports intensive double cropping.
Indian illustrations
- Laterite profiles of Kerala, Odisha, and the Western Ghats are leached and acidic, so they need lime, organic matter, and tree or plantation crops more than unamended wheat.
- Desert soils of Rajasthan have a weak profile, low humus, and high pH, so agriculture depends on irrigation and not on the native A horizon alone.
- Mountain and peat profiles limit plough depth and create waterlogging; crop choice must follow that section, not a national package.
Practice that reads the profile
- The Soil Health Card scheme, 2015, and NBSS&LUP mapping treat the profile as a farm input, not as a textbook diagram.
- Tillage, drainage, gypsum on sodic plains, and contour bunds are profile management; ignoring the section causes salinity, crusting, and yield collapse.
- I therefore agree: without a profile, fertiliser and seed are guesses.
Flow diagram
flowchart TD P[Soil profile] --> A[O A organic] P --> B[B moisture clay] A --> C[Crop choice yield] B --> C
Conclusion
Yes. The soil profile sets organic matter, moisture, depth, and chemistry, and Indian farming succeeds where the section is read—alluvium, regur, laterite, or desert. An 8-mark answer should agree and show that cards and amendments are profile tools.
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Can fertiliser replace a poor profile?
Only in part. Fertiliser can add nutrients, but depth, drainage, and structure still limit roots. Organic matter and drainage must repair the section.
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Is the C horizon useful to farmers?
It is parent material. Roots of deep perennials may touch it, but annual crops live mainly in A and B. Weathering of C slowly feeds the profile.
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