The correct option is Black soil.
Explanation
Cotton is a tropical and subtropical crop that requires specific soil conditions for optimal growth, particularly high moisture retention and aeration. The choice of soil significantly impacts the yield and quality of the fiber.
Detailed Analysis
- Black Soil (Regur): This is the most suitable soil for cotton cultivation, often referred to as "Black Cotton Soil." Derived from the weathering of basaltic lava rocks (Deccan Trap), it is rich in clay content. Its high moisture-retentive capacity supports the crop during dry spells. Additionally, this soil develops deep cracks during hot weather, facilitating natural aeration (self-ploughing).
- Red Soil: While cotton can be grown in red soil with the aid of irrigation and fertilizers, it is not the most naturally suitable due to its lower moisture retention and deficiency in nitrogen, phosphorus, and humus.
- Laterite Soil: This soil is formed by intense leaching in areas of high temperature and rainfall. It is generally acidic and low in fertility, making it more suitable for plantation crops like cashew, tea, and coffee rather than cotton.
- Alluvial Soil: Although fertile and capable of supporting cotton (as seen in parts of Punjab and Haryana), it does not possess the unique moisture-holding and self-aerating properties of black soil that are specifically advantageous for rainfed cotton cultivation.
Key Takeaway
Black soil (Regur) is the ideal medium for cotton cultivation due to its high clay content, ability to retain moisture, and richness in calcium carbonate, magnesium, potash, and lime.