Soil great group

Hapludol

Of 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..

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..

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
Loam
Most common drainage
Well drained
Typical effective depth
100 cm

Where it is found

According to the 1:500.000 national map, it covers about 12.417.963 ha, spread over 137 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
Buenos Aires9.250.289 ha
Entre Ríos1.002.702 ha
Córdoba481.182 ha
Santa Fe441.070 ha
Misiones416.271 ha
Tucumán304.645 ha
Chaco225.244 ha
La Pampa94.105 ha
Salta88.761 ha
Corrientes39.388 ha

Districts where it is most common

It also appears on the detailed maps of: Buenos Aires, Corrientes, Entre Ríos, Misiones, Santiago del Estero.

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 17 and 57.

Land capability

II
III
IV

class I: 2% · class II: 22% · class III: 41% · class IV: 29% · class VI: 6% · class VII: 1%

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

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.

Buenos Aires

Ortiz de Rosas · Lincoln · Norumbega · Bolivar · La Albina · La Alianza · Piedritas · Maipu · Rancho Grande · Pichincha · Nueve de Julio · Saforcada · Saladillo · Cañada Seca · Fortin Tiburcio · Santa Isabel · Ameghino · Estacion Naon · Lazzarino · Del Valle · Junin · Ochandio · Sierra de los Padres · Bragado · Las Nutrias · San Gregorio · San Pedro · Estancia Santa Ana · La Ponderosa · El Carmen · La Otomana · La Pandorga · Carlos Salas · El Toro · Membrillar · Santa Regina · Arroyo de Zabala · Cristiano Muerto · Estacion Invernadas · Orense · El Abolengo · Pehuajo · Henderson · Carlos Tejedor · Estacion Gonzalez Moreno · Santa Teresita · Los Naranjos

Entre Ríos

Calabacilla · Arroyo Grande · Mandisoví · Don Antonio · Los Amigos · El Lucero · Isla Victoria · El Mosquito · Rincón de Nogoyá · Siete Colinas · El Resuello · La Matrera · El Reposo

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