The pair of districts having Red and Yellow Soils, is-

The correct answer is Ajmer - Sirohi.

Key Points

• Red and yellow soils are prominently found in Ajmer and Sirohi districts of Rajasthan.
• These soils are formed due to the weathering of igneous rocks under semi-arid climatic conditions.
• Red soils owe their color to the presence of ferric oxide, while yellow soils develop a yellowish tint due to hydrated iron oxide.
• Such soils are generally poor in nitrogen, phosphorous, and organic matter, requiring regular fertilization for agricultural productivity.
• These soil types are extensively found in regions with low rainfall and moderate temperatures.

Additional Information

• Red Soil Characteristics:
  • Rich in iron but deficient in nitrogen, phosphorous, and humus.
  • Found in regions with high iron content in the parent rock.
  • Suitable for crops such as millet, pulses, and groundnut.
• Yellow Soil Characteristics:
  • Yellow coloration occurs due to the presence of hydrated iron oxide.
  • Typically found in areas with moderate rainfall and semi-arid climates.
  • Used for cultivation of dryland crops.
• Formation Process:
  • Both red and yellow soils are formed from the weathering of igneous rocks.
  • The soil’s color depends on the oxidation state of iron in the soil minerals.
• Distribution in India:
  • Red and yellow soils are commonly found in the southern and eastern parts of the Deccan Plateau, parts of Odisha, Chhattisgarh, and Rajasthan.
  • They cover a significant portion of India's semi-arid regions.