Soil Survey and Classification Quiz

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15 Questions

Who is credited with organizing soils into groups with similar observable properties based on broad climatic zone?

V.V Dokuchaev

What is the formal term for the system of classification developed by the USDA Soil Survey?

Soil Taxonomy

What is the basic sampling unit used in soil surveys?

Pedon

What is an essential soil individual, comprising an identifiable series of soils in an area?

Polypedon

What is the smallest volume that can be called a soil?

Pedon

Which category in soil taxonomy is the most detailed?

Soil Series

What is the purpose of Soil Taxonomy?

To establish groups or classes for practical purposes related to soil

Which soil order is found in arid regions of the world?

Aridisols

Which soil type exhibits only ephemeral soil development and is largely confined to the surface horizon?

Entisol

What distinguishes Histosols from other soil types?

Organic material such as peat or muck

Which soil type is known for having high clay content and large shrink-swell potential?

Vertisols

What distinguishes Andisols from other soil types?

Originating from volcanic ejecta like ash or cinder

Which soil type is characterized by thick, dark, soft surface and high base saturation?

Mollisols

What defines Ultisols compared to Alfisols?

More weathered with low base saturation and redder color

What characterizes Spodosols?

Acid sandy soils with thick E and red Bhs horizons

Study Notes

Soil Classification and Taxonomy

  • Konstantin Dmitrievich Glinka is credited with organizing soils into groups with similar observable properties based on broad climatic zones.

USDA Soil Survey

  • The formal term for the system of classification developed by the USDA Soil Survey is Soil Taxonomy.

Soil Surveys

  • The basic sampling unit used in soil surveys is the Pedon.

Soil Individuals

  • A Polypedon is an essential soil individual, comprising an identifiable series of soils in an area.

Soil Units

  • The smallest volume that can be called a soil is a Pedon.

Soil Taxonomy Categories

  • The Order category is the most detailed in Soil Taxonomy.

Purpose of Soil Taxonomy

  • The purpose of Soil Taxonomy is to provide a standardized system for communicating and understanding soils.

Soil Orders

  • Aridisols are a soil order found in arid regions of the world.
  • Entisols exhibit only ephemeral soil development and are largely confined to the surface horizon.

Histosols

  • What distinguishes Histosols from other soil types is their high organic matter content.

Clay-Rich Soils

  • Vertisols are known for having high clay content and large shrink-swell potential.

Andisols

  • What distinguishes Andisols from other soil types is their high content of volcanic glass and minerals.

Mollisols

  • Mollisols are characterized by a thick, dark, soft surface and high base saturation.

Ultisols and Alfisols

  • Ultisols are defined by their lower base saturation compared to Alfisols.

Spodosols

  • Spodosols are characterized by a subsurface horizon with high concentrations of aluminum and iron oxides.

Test your knowledge of soil survey, classification, and land-use principles, including soil taxonomy and the history of soil classification. This quiz is based on Chapter 6 of the Soil Science 01 course for USM-CA Students (1 BSA-A) and covers laboratory activities in soil profiling.

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