Soil great group
Paleudult
Of the Udult suborder; it is very old and evolved: very thick clay horizon, or a petrocalcic horizon (calcareous hardpan) indicating a long time of formation.
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 | Ultisol | Soil very washed out by a warm and humid climate, with a clay accumulation horizon and low base saturation: acidic and poor in calcium and magnesium. |
|---|---|---|
| Suborder | Udult | Ultisol humid climate, well drained. |
| Great group | Paleudult | Within the Udult suborder, it is very old and evolved: very thick clay horizon, or a petrocalcic horizon (calcareous hardpan) indicating a long time of formation. |
What it means for farming
Deep and well structured, but acidic and of low natural fertility. They are the soils reds of Misiones: grass, tea, forestry, and agriculture with liming and fertilization.
Where it is found
According to the 1:500.000 national map, it covers about 42.547 ha, spread over 3 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 |
|---|---|
| Corrientes | 42.547 ha |
Districts where it is most common
Subgroups on the maps
- Paleudult plíntico
- Paleudult arénico
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)