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Zorluk: ZorSoil Types, Distribution, and Soil Conservation in Nigeria

During a pedological survey of the middle belt region of Nigeria, soil profile pits over crystalline basement rocks reveal reddish-brown sandy-clay subsoils underlain by an impermeable, iron-rich indurated layer. Following clear-cutting of Guinea savanna vegetation, intense seasonal drying has accelerated surface crusting and sheet wash. Which combination of soil process and management practice is most appropriate for restoring productivity to this soil type?

  1. Process: Ferruginization and hardpan crusting due to desiccation; Management: Application of cover cropping and organic mulching to retain moisture and restore soil aggregate stability.Cevap
  2. B
    Process: Podzolization driven by low temperatures; Management: Application of heavy chemical fertilizers to replace leached bases.
  3. C
    Process: Mass wasting down gentle slopes via solifluction; Management: Construction of concrete retaining walls along field boundaries.
  4. D
    Process: Marine siltation and salt-crust accumulation; Management: Mandatory bush burning prior to planting to flush excess minerals.

Cevap

Process: Ferruginization and hardpan crusting due to desiccation; Management: Application of cover cropping and organic mulching to retain moisture and restore soil aggregate stability.
Ferruginous tropical soils in Nigeria's middle belt develop over crystalline basement rocks. Removing vegetation cover exposes iron oxides to alternating wet and dry seasons, baking the soil into an indurated hardpan crust. Cover cropping and organic mulching shield the soil from direct solar radiation and rainfall kinetic energy, preserving soil moisture and aggregate stability.

Adım Adım Çözüm

1
Identify the pedological profile and environmental context.
The soil profile describes Ferruginous tropical soils formed over crystalline basement complex rocks in Nigeria's middle belt (Guinea savanna zone).
Ferruginous soils are rich in iron oxides and feature sandy-clay horizons prone to induration upon desiccation.
2
Analyze the degradation mechanism triggered by vegetation removal.
Clearing vegetation exposes the iron-rich subsoil to alternating intense wet and dry seasons, causing thermal baking, surface crusting, and subsurface hardpan formation.
Direct exposure accelerates iron oxide oxidation and desiccation, forming an impermeable crust that reduces water infiltration.
3
Determine the effective soil conservation strategy.
Cover cropping and organic mulching protect topsoil from direct solar radiation and raindrop impact while building organic structure.
Biological soil conservation methods improve moisture retention and soil structure without disturbing fragile subsoil horizons.

Anahtar Kavram

Ferruginous Tropical Soil Degradation and Conservation in Nigeria
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Konular

Soil Types, Distribution, and Soil Conservation in Nigeria

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