Soil great group

Ustifluvent

Of the Fluvent suborder; it It has a subhumid to semiarid climate (ustic moisture regime).

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).

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 6.221.768 ha, spread over 89 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
Salta1.759.460 ha
Santiago del Estero1.638.067 ha
Chaco894.391 ha
Formosa688.800 ha
Buenos Aires411.990 ha
Catamarca257.254 ha
Tucumán177.673 ha
La Pampa145.278 ha
Jujuy144.580 ha
Córdoba99.897 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 19 and 29.

Land capability

III
IV
V
VI

class II: 3% · class III: 18% · class IV: 23% · class V: 25% · class VI: 28% · class VII: 2%

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.

Subgroups on the maps

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 · Cuatreros · Vidriera · Ingeniero White · Isla Zuraita · Puesto El Zorro · Punta Laberinto

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