andisol
Andisol is a soil order in the USDA soil taxonomy that refers to soils formed in volcanic ash or tephra. In the World Reference Base for Soil Resources, the equivalent group is named Andosols. These soils are characterized by the presence of amorphous or poorly crystalline minerals, especially allophane and imogolite, which strongly influence their chemical and physical properties.
Formation and properties: Andisols form rapidly in recently deposited volcanic ash and tend to be relatively
Management and use: The high phosphorus fixation of Andisols can limit P availability for crops, requiring
Distribution and occurrence: Andisols occur in volcanic regions worldwide, including areas around the Pacific Ring of