Soil subgroup

Hapludol fluvéntico

The organic matter does not go down little by little with depth but rather goes up and down: it is made up of layers of alluvium.

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.
SuborderUdolMolisol humid climate (udic moisture regime): the profile almost never spends more than three months dry.
Great groupHapludolWithin the Udol 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..
SubgroupfluvénticoThe organic matter does not go down little by little with depth but rather goes up and down: it is made up of layers of alluvium.

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.

It dominates the Pampa Arenosa of the west of Buenos Aires and the south of Córdoba and Santa Fe: soils looser, with good drainage, which depend more on rain.

Most common surface texture
Loamy sand
Most common drainage
Imperfect
Typical effective depth
75 cm

Where it is found

According to the 1:500.000 national map, it covers about 291.925 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
Entre Ríos246.783 ha
Chubut29.728 ha
Chaco11.288 ha
Córdoba4.125 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 50 (average); half of the units fall between 30 and 50.

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 Hapludol 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

Calabacilla · Mandisoví · Rincón de Nogoyá · El Reposo · Ceibas · Aldea Asunción · Embarcadero Fernández · Palavecino · Monte Alto

Buenos Aires

Villa Roch · Paraje Los Angeles

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