Soil subgroup

Ustocrept údico

It is more humid than the typical one of the group: its humidity regime is on the border with the udic.

Ustocrept 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 Haplustept.

What the name says

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

Taxonomic orderInceptisolSoil young, with some development below the surface (a cambic horizon) but without the clay accumulation or dark surface that would define other orders.
SuborderOcreptInceptisol with a clear surface and poor in organic matter (ochric epipedon).
Great groupUstocreptWithin the Ocrept suborder, it It has a subhumid to semiarid climate (ustic moisture regime).
SubgroupúdicoIt is more humid than the typical one of the group: its humidity regime is on the border with the udic.

What it means for farming

Intermediate aptitude and very dependent on location. In Argentina there are many Acueptes: Inceptisoles with excess water, often saline or sodic.

Most common surface texture
Loam
Most common drainage
Moderate
Typical effective depth
120 cm

Where it is found

According to the 1:500.000 national map, it covers about 797.330 ha, spread over 11 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
Chaco721.841 ha
Salta75.489 ha

Districts where it is most common

It also appears on the detailed maps of: Salta.

How productive it is

Where it is the main soil of the map unit, the productivity index has a median of 60 (Well); half of the units fall between 50 and 68.

Land capability

I
II
IV

class I: 38% · class II: 44% · class III: 2% · class IV: 11% · class V: 6%

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 Ustocrept subgroups

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