Trumao is the name of a
soil of the
Andosol order found in southern and central
Chile. Trumaos are formed from young
volcanic ash, by volcanic ash redeposited by
aeolian processes or by volcanic ash mobilized as
alluvium.[1][2] Trumaos are characterized by containing the following minerals:
allophane,
imogolite plus a series of
paracrystalline and non-crystalline
clays.[3] These soils have high
porosity and low
bulk density.[2] A more dry and a more humid variety of trumaos exists. The dry variety is known simply as trumao while the humid variety is known as trumao húmedo.[1]
In terms of
latitude trumaos can be found in the Andes from 33° S to 43° S, in the
Central Valley from 38° S to 43° S and in the eastern slopes of the
Chilean Coast Range from 39° S to 43° S.[1]