Soil subgroup

Haplustalf 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 orderAlfisolSoil with a clay accumulation horizon (argillic or natric) and good base saturation, but without the thick, dark surface of a Molisol.
SuborderUstalfAlfisol from subhumid to semi-arid climate (ustic moisture regime).
Great groupHaplustalfWithin the Ustalf suborder, it It is the simplest of the suborder: it does not have a clay horizon or any other feature that places it in a more specific group..
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

Acceptable fertility, but the surface layer is thinner and poor in organic matter. In the Pampas region many Alfisoles are sodic or floodable (Natracualfes) and are left for livestock.

Most common surface texture
Silt loam
Most common drainage
Imperfect
Typical effective depth
50 cm

Where it is found

According to the 1:500.000 national map, it covers about 958.977 ha, spread over 10 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
Formosa862.164 ha
Chaco87.616 ha
Tucumán3.423 ha
Salta2.949 ha
Santiago del Estero2.825 ha

Districts where it is most common

It also appears on the detailed maps of: Salta.

How productive it is

Where it is the main soil of the map unit, the productivity index has a median of 41 (average); half of the units fall between 32 and 41.

Land capability

II

class II: 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 Haplustalf subgroups

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