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Difficulty: MediumSoil Types, Distribution, and Soil Conservation in Nigeria

In the seasonally flooded floodplains and low-lying river valleys of Nigeria (commonly referred to as Fadama lands), intensive dry-season agriculture is widely practiced. Which soil type dominates these riverine environments, and what key characteristic accounts for its high agricultural productivity?

  1. Hydromorphic soils, characterized by fine alluvial silt deposition and high organic matter content under poorly drained conditionsAnswer
  2. B
    Ferrallitic soils, characterized by deep leaching of plant nutrients and heavy accumulation of iron and aluminum oxides
  3. C
    Regosols, characterized by loose, coarse sandy grains with minimal organic matter deposited by desert winds
  4. D
    Ferruginous tropical soils, characterized by a hardened surface ironstone pan formed over basement complex rocks

Answer

Hydromorphic soils, characterized by fine alluvial silt deposition and high organic matter content under poorly drained conditions
Hydromorphic (alluvial) soils dominate Nigerian floodplains and Fadama areas along major rivers and deltaic zones. Seasonal overflow deposits fertile fine silt, clay, and organic material under waterlogged conditions, creating nutrient-rich soil with high water-retention capacity ideal for intensive dry-season cultivation.

Step-by-Step Solution

1
Identify the geographical setting described in the question stem
The setting is river valleys, low-lying floodplains, and Fadama zones along major Nigerian rivers like the Niger and Benue.
Topographic position and drainage conditions determine pedogenic processes.
2
Associate the geographical environment with its corresponding soil group
Seasonally inundated or waterlogged valley floors foster hydromorphic (alluvial) soil formation.
Excess water leads to gleying and continuous deposition of fine river sediment (silt and clay) along with organic debris.
3
Evaluate the primary physical property supporting dry-season farming
High silt content, good water retention, and rich organic deposits provide high natural fertility without rapid drying.
These characteristics make Fadama lands highly productive for vegetable and rice cultivation.

Key Concept

Hydromorphic (alluvial) soil distribution and characteristics in Nigerian river floodplains
Estimated Time:1m 0s
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Topics

Soil Types, Distribution, and Soil Conservation in Nigeria

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