Which of the following statements correctly differentiates Alluvial soils from Red and Yellow soils?
- AOption (a)
Alluvial: from rocks; Red/Yellow: river-transported
- BOption (b)
Alluvial: older types most fertile; Red/Yellow: colored by iron
- COption (c)
Alluvial: sandy loam to clay; Red/Yellow: sandy loam, less fertile uplands
- DOption (d)
Alluvial: rich in phosphorus and humus; Red/Yellow: rich in potashAlluvial: rich in phosphorus and humus; Red/Yellow: rich in potash
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Correct answer
Alluvial: sandy loam to clay; Red/Yellow: sandy loam, less fertile uplands
Why this answer is correct
The correct answer is Alluvial: sandy loam to clay; Red/Yellow: sandy loam, less fertile uplands.
Key Points
- Alluvial soils are primarily found in river basins, where fine sediments are deposited by rivers. They range from sandy loam to clay in texture.
- Red and Yellow soils, on the other hand, are formed through the weathering of crystalline igneous rocks and are predominant in upland regions. They are typically sandy loam in texture.
- Alluvial soils are highly fertile and support intensive agriculture due to their rich composition of minerals and nutrients.
- Red and Yellow soils are less fertile compared to alluvial soils and are associated with upland areas, often requiring soil management practices to enhance productivity.
- The distinction in texture and fertility between these soil types has a significant impact on the agricultural activities and crop choices in their respective regions.
Additional Information
- Alluvial Soils:
- These soils are majorly found in plains such as the Indo-Gangetic plain and the Brahmaputra valley.
- They are rich in potash, phosphoric acid, and lime, making them highly suitable for crops like wheat, sugarcane, and rice.
- Alluvial soils can be categorized as new alluvium (Khadar) and old alluvium (Bhangar).
- Red and Yellow Soils:
- The red color is due to the presence of ferric oxide, while the yellowish tinge appears when they occur in hydrated form.
- These soils are found in areas such as the Deccan Plateau, Odisha, Chhattisgarh, and southern parts of the Gangetic plain.
- They are deficient in nitrogen, phosphorus, and organic matter, requiring fertilizers for better agricultural output.
- Soil Texture:
- Texture refers to the proportion of sand, silt, and clay in the soil. Sandy soils are coarse, while clay soils are fine-grained.
- Sandy loam is a balanced texture that facilitates good drainage and aeration.
- Soil Fertility:
- Fertility is determined by the presence of essential nutrients such as nitrogen, phosphorus, potassium, and organic matter.
- Fertile soils support higher crop yields and diverse agricultural practices.