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GS Geography Physical Geography of World
Q.

Alluvial soils are rich soil for crop cultivation but are poor in:
Explanation:

ANS. (B) 
Alluvial soils are fertile soils composed of sediments deposited by rivers and the waves. However, they are usually deficient in nitrogen and humus. Nitrogen deficiency is the main limiting factor in crop production in all the alluvial soils except the calcareous and saline alkali alluvial soils. With suitable irrigation, fertilizers and proper agricultural practices, alluvial soils are generally very fertile.

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