Soil great group
Durustol
Of the Ustol suborder; it has a duripan: a horizon cemented by silica.
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 | Ustol | Molisol from subhumid to semi-arid climate (ustic moisture regime): water is enough in the growing season but there are long dry periods. |
| Great group | Durustol | Within the Ustol suborder, it has a duripan: a horizon cemented by silica. |
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
- Silt loam
- Most common drainage
- Well drained
- Typical effective depth
- 80 cm
Where it is found
According to the 1:500.000 national map, it covers about 449.580 ha, spread over 9 districts.
Loading map…
National map units that list it. The scale is 1:500.000: good for seeing the region, not a single property.
| Province | Area |
|---|---|
| Chaco | 414.571 ha |
| Santiago del Estero | 35.009 ha |
Districts where it is most common
- Almirante Brown · Chaco
- General Güemes · Chaco
- 9 de Julio · Chaco
- General Belgrano · Chaco
- Chacabuco · Chaco
- Moreno · Santiago del Estero
- 12 de Octubre · Chaco
- Alberdi · Santiago del Estero
- Independencia · Chaco
It also appears on the detailed maps of: Santiago del Estero.
How productive it is
Where it is the main soil of the map unit, the productivity index has a median of 38 (low); half of the units fall between 38 and 38.
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
- Durustol ortídico
- Durustol típico
- Durustol arídico cálcico
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)