Soil subgroup

Ustifluvent típico

It is the central concept of the great group: it has its features and none that brings it closer to another group.

What the name says

Soil Taxonomy names are built from parts, and each part says something about the soil. From general to specific:

Taxonomic orderEntisolSoil without diagnostic horizons, or almost: recently deposited material (sand, alluvium) or on which the climate did not have time to act.
SuborderFluventEntisol formed by layers of alluvium left by a river when it overflows; organic matter rises and falls with each layer.
Great groupUstifluventWithin the Fluvent suborder, it It has a subhumid to semiarid climate (ustic moisture regime).
SubgrouptípicoIt is the central concept of the great group: it has its features and none that brings it closer to another group.

What it means for farming

Very variable. The sandy ones (Psamentes) retain little water and blow away; alluvial ones (Fluventes) can be good but they flood; the shallow ones on rock (lithic) are barely useful for grazing.

Most common surface texture
Sandy
Most common drainage
Something Excessive
Typical effective depth
80 cm

Where it is found

According to the 1:500.000 national map, it covers about 5.061.627 ha, spread over 81 districts.

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National map units that list it. The scale is 1:500.000: good for seeing the region, not a single property.

ProvinceArea
Santiago del Estero1.606.241 ha
Salta1.443.460 ha
Formosa682.877 ha
Chaco553.622 ha
Catamarca247.780 ha
Tucumán167.636 ha
La Pampa145.278 ha
Jujuy134.967 ha
Córdoba78.658 ha

Districts where it is most common

It also appears on the detailed maps of: Buenos Aires, Salta, Santiago del Estero.

How productive it is

Where it is the main soil of the map unit, the productivity index has a median of 24 (low); half of the units fall between 14 and 29.

Land capability

III
IV
V
VI

class II: 3% · class III: 21% · class IV: 22% · class V: 29% · class VI: 24% · class VII: 1%

Taken from the maps that include this data. A map unit with several soils has a single index, and it is only attributed to the dominant soil.

Other Ustifluvent subgroups

Soil series

Series are the specific soils, named after places, that detailed maps describe under this name. Two properties with the same series have the same soil.

Buenos Aires

Garnica · Vidriera

Soils it shares map units with

Several soils share each map unit. These are the ones most often found alongside this one: on a property, you will likely find them in the nearby low ground or on the next rise.

The definitions are a plain-language summary of the USDA Keys to Soil Taxonomy. The formal definition includes thickness, color and percentage thresholds that are left out here.

Sources