5.11 - Andisols

Soils form in volcanic ash and cinders near or downwind from volcanic activity. Generally lacking in development, they are not extensively weathered, forming in deposits from geologically recent events. Usually of high natural fertility, they tend to accumulate organic matter readily and are of a ‘light’ nature (low bulk density) that is easily tilled. These soils generally have a high productivity potential.

Soil order - Andisols. *Image courtesy of USDA-NRCS*

Profile example - Andisol Series. *Image courtesy of USDA-NRCS*

**Idaho state soil**

**USDA details**

**More information from the University of Idaho**

Key Characteristics: Andisols

Form in regions of recent volcanism
Volcanic parent materials
Generally high in natural fertility
‘Light’ soils that are easily cultivated.
Potentially very productive soils
Limited geographic distribution
Extent of world ice-free land area: 1%

U.S. Order Distribution Map for Andisols. *Image courtesy of USDA-NRCS*

**Further Detail by the NRCS**

Quiz

Question

Andisol soils are formed as a result of what type of geologic activity?‏

A. Volcanism

Correct: Andisols are soils forming in ash and cinders near or downwind from volcanic areas.

B. Tsunami

Incorrect: Andisols are soils forming in ash and cinders near or downwind from areas of what type of geologic activity?

C. Earthquake

Incorrect: Andisols are soils forming in ash and cinders near or downwind from areas of what type of geologic activity?

D. Glacier

Incorrect: Andisols are soils forming in ash and cinders near or downwind from areas of what type of geologic activity?

E. Erosion

Incorrect: Andisols are soils forming in ash and cinders near or downwind from areas of what type of geologic activity?

Looks Good! Correct: Andisols are soils forming in ash and cinders near or downwind from volcanic areas.

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