Question

Which of the following represents 'vertisol'

• A. Black cotton soil
• B. Sandy loam sodic soil
• C. Submontane (Tarai) soil
• D. Red loamy soil

Hint:

The word "Vertisol" comes from the Latin "vertere" (to turn), referring to the way the soil turns itself over as surface material falls into cracks during the dry season.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks to identify the common soil type that corresponds to the soil order "Vertisol" in the USDA Soil Taxonomy system.

Step 2: Detailed Explanation:

• Characteristics of Vertisols: Vertisols are heavy clay soils with a high proportion of swelling clays, such as montmorillonite.

• Self-Mulching Property: These soils exhibit significant volume changes with moisture content. They shrink and form deep, wide cracks when dry, and swell significantly when wet.

• This "churning" or "pedoturbation" leads to a lack of distinct horizons and the formation of slickensides.

• Black Cotton Soil (Regur): In India, these soils are famously known as Black Cotton Soils because they are black in color (due to titaniferous magnetite and organic matter) and are exceptionally well-suited for cotton cultivation.

• Distribution: They are widely found in the Deccan Plateau region, including parts of Maharashtra, Gujarat, and Madhya Pradesh.

• They are generally rich in lime, magnesia, and alumina but poor in phosphorus, nitrogen, and organic matter.
Final Answer:
Vertisols are synonymous with Black Cotton Soils, characterized by their high clay content and shrink-swell capacity.