Which one among the following statements with reference to the black cotton soils of India is NOT correct ?

Black cotton soils, also known as Regur soils (Statement A), are primarily found in the Deccan Trap region. Statement D is incorrect because these soils are characterized by a high clay content (often exceeding 60%), rather than a "less clay factor."

Key characteristics include:

• Moisture Retention: Their high clay percentage makes them highly moisture-retentive (Statement B), which is ideal for rain-fed crops like cotton.
• Chemical Composition: They are rich in lime, iron, magnesium, and alumina (Statement C), though they generally lack phosphorus, nitrogen, and organic matter.
• Self-Ploughing: They swell and become sticky when wet, but develop deep cracks when dry, which helps in aeration.

Because of their heavy, compact, and clayey nature, they are specialized for specific crops like cotton, pulses, and oilseeds, rather than a wide variety of delicate vegetables.