Soil great group

Haplustalf

Of 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..

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..

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
80 cm

Where it is found

According to the 1:500.000 national map, it covers about 4.022.319 ha, spread over 31 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
Formosa1.489.149 ha
Salta1.169.565 ha
Santiago del Estero911.135 ha
Chaco387.841 ha
Jujuy57.951 ha
Tucumán6.677 ha

Districts where it is most common

It also appears on the detailed maps of: 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 32 (low); half of the units fall between 29 and 41.

Land capability

II
III

class II: 83% · class III: 8% · class IV: 5% · class VI: 2% · 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

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