COPY: USDA Soil Taxonomy Flashcards
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Questions and Answers

What is Soil Taxonomy?

Classification of soil types based on their properties and was developed by the United States Department of Agriculture and the National Cooperative Soil Survey.

What was the original purpose of soil taxonomy?

To serve the purposes of soil surveys.

How many levels or hierarchies are there for soil taxonomy?

Six; Order, Suborder, Great Group, Subgroup, Family, Series.

How many recognized orders are there in soil taxonomy?

<ol start="12"> <li></li> </ol> Signup and view all the answers

Orders in soil taxonomy are divided into (blank) primarily on the basis of properties that influence soil formation.

<p>Suborders.</p> Signup and view all the answers

Each suborder is divided into (blank) determined by close similarities in kind, arrangement, and extent of soil horizon development.

<p>Great Groups.</p> Signup and view all the answers

What is a subdivision of a great group in soil taxonomy?

<p>Subgroup.</p> Signup and view all the answers

What is the division called within a subgroup determined primarily on the basis of physical and chemical properties?

<p>Family.</p> Signup and view all the answers

What does a series consist of in soil taxonomy?

<p>Soils that have horizons similar in color, texture, structure, reaction, consistence, mineral and chemical composition.</p> Signup and view all the answers

Name the recognized soil orders.

<p>Alfisols, Andisols, Aridsols, Entisols, Gelisols, Histosols, Inceptisols, Mollisols, Oxisols, Spodosols, Ultisols, Vertisols.</p> Signup and view all the answers

What are Alfisols?

<p>Moderately leached deciduous forest soils that have relatively high fertility and contain a subsurface horizon in which clay has accumulated.</p> Signup and view all the answers

What are Andisols?

<p>Soils formed from volcanic activity, typically dominated by glass and poorly crystalline colloidal materials, very fertile.</p> Signup and view all the answers

What are Aridsols?

<p>Soils that contain calcium carbonate and are characteristic of arid regions.</p> Signup and view all the answers

What are Entisols?

<p>Soils of recent origin consisting of unaltered parent material usually with no genetic horizons, except an A horizon.</p> Signup and view all the answers

What are Gelisols?

<p>Soils of very cold climates that contain permafrost within 2 meters of the surface.</p> Signup and view all the answers

What are Histosols?

<p>Soils composed mainly of organic materials containing at least 20-30% organic matter.</p> Signup and view all the answers

What are Inceptisols?

<p>Soils that exhibit minimal horizon development but lack features and characteristics of other soil orders.</p> Signup and view all the answers

What are Mollisols?

<p>Soils of grassland ecosystems characterized by a thick, dark surface horizon known as mollic epipedon.</p> Signup and view all the answers

What are Oxisols?

<p>Very highly weathered soils found primarily in tropical regions with extremely low fertility.</p> Signup and view all the answers

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