Soil subgroup
Haplacuol hístico
It has an organic, peat surface layer.
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 order | Molisol | Soil 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. |
|---|---|---|
| Suborder | Acuol | Molisol with excess water: saturated near the surface for part of the year, with redox depletions (gray, mottles) in the profile. |
| Great group | Haplacuol | Within 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.. |
| Subgroup | hístico | It has an organic, peat surface layer. |
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
- Silty clay
- Most common drainage
- Very poor
- Typical effective depth
- 100 cm
Where it is found
According to the 1:500.000 national map, it covers about 159.002 ha, spread over 6 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.
| Province | Area |
|---|---|
| Buenos Aires | 101.028 ha |
| Entre Ríos | 57.974 ha |
Districts where it is most common
- Islas del Ibicuy · Entre Ríos
- Zárate · Buenos Aires
- San Fernando · Buenos Aires
- Campana · Buenos Aires
- Tigre · Buenos Aires
- La Plata · Buenos Aires
It also appears on the detailed maps of: Entre Ríos.
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
Isla Don Antonio · Estancia San Juán
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
- Soil Survey Staff. (2014). Claves para la Taxonomía de Suelos, 12.ª edición. USDA - Natural Resources Conservation Service. · Dominio público (USDA)
- INTA · Dominio público (carta 1:500.000)