Question

The most important soils for agriculture are

• A. Alluvial soils
• B. Black soils
• C. Red soils
• D. Saline soils

Hint:

Alluvial soils are the most fertile soils due to their rich mineral content deposited by rivers. They form the agricultural backbone of India, supporting the highly productive Indo-Gangetic plains.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
India is divided into several major soil groups, each having distinct physical, chemical, and biological properties.
The suitability of a soil group for agriculture depends on its nutrient status, texture, depth, water-holding capacity, and geographical distribution across major river basins.

Step 2: Detailed Explanation:
Let us evaluate the agricultural importance of the major soil groups:
Alluvial Soils (A): These are depositional soils transported and deposited by rivers (primarily the Indo-Gangetic-Brahmaputra river systems).
They are highly fertile, deep, medium-textured (ranging from sandy loam to clay loam), and possess excellent physical properties and water-holding capacity.
They cover about 40% of India's total land area and support intensive cultivation of major food crops like rice, wheat, sugarcane, and pulses.
This makes them the most important soils for Indian agriculture.
Black Soils (B): These are clayey, self-ploughing soils derived from basaltic lava.
While highly productive for cotton and oilseeds, they are difficult to manage when wet or dry due to high swelling and shrinkage.
Red Soils (C): These are light-textured, highly leached soils developed on crystalline granitic rocks.
They are nutrient-deficient and require substantial fertilizer and irrigation to be productive.
Saline Soils (D): These soils contain excessive concentrations of soluble salts, which inhibit plant growth and make them unsuitable for normal agriculture unless reclaimed.

Step 3: Final Answer:
Alluvial soils are the most agriculturally productive and important soils, which corresponds to option (A).