Soil subgroup

Haplacuol típico

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

Haplacuol is a name from the 1975 taxonomy, which many INTA soil survey maps were made with. The current edition no longer has this group: today it would be classified as Endoacuol.

What the name says

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

Taxonomic orderMolisolSoil with a thick, dark surface horizon rich in organic matter (the mollic epipedon), with more than half of its exchange capacity occupied by calcium, magnesium, potassium and sodium. It forms under grassland.
SuborderAcuolMolisol with excess water: saturated near the surface for part of the year, with redox depletions (gray, mottles) in the profile.
Great groupHaplacuolWithin the Acuol 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

They are the soils agricultural lands par excellence: the Pampas grassland formed them and most of Argentine agriculture is done on them. They retain water and nutrients; its limitation, when there is one, is below: clay, sodium, calcareous hardpan or drainage.

Most common surface texture
Loam
Most common drainage
Poor
Typical effective depth
71 cm

Where it is found

According to the 1:500.000 national map, it covers about 765.085 ha, spread over 16 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
Entre Ríos516.886 ha
Chubut152.159 ha
Santa Fe61.252 ha
Chaco25.632 ha
Córdoba9.095 ha

Districts where it is most common

It also appears on the detailed maps of: Buenos Aires, Entre Ríos.

How productive it is

Where it is the main soil of the map unit, the productivity index has a median of 14 (very low); half of the units fall between 9 and 19.

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 Haplacuol 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.

Entre Ríos

Potrero Los Sauces · El Refugio · El Rosedal · El Rosadal · Estancia La Peregrina · El Pato · Potrero Cinco

Buenos Aires

Ostende · Laguna Blanca

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