Soil subgroup

Ustifluvent ácuico

Shows signs of saturation with water within the first meter (mottles, gray reduction colors): it has a temporary water table or waterlogging.

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).
SubgroupácuicoShows signs of saturation with water within the first meter (mottles, gray reduction colors): it has a temporary water table or waterlogging.

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
Loam
Most common drainage
Very poor
Typical effective depth
110 cm

Where it is found

According to the 1:500.000 national map, it covers about 725.004 ha, spread over 14 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
Buenos Aires383.944 ha
Salta313.523 ha
Tucumán10.036 ha
Catamarca9.474 ha
Formosa5.923 ha
Santiago del Estero1.062 ha
Chaco1.041 ha

Districts where it is most common

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

How productive it is

Where it is the main soil of the map unit, the productivity index has a median of 19 (very low); half of the units fall between 19 and 27.

Land capability

VI

class VI: 100%

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

Cuatreros · Ingeniero White · Puesto El Zorro · Punta Laberinto

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