Aquult

[′ak·wəlt]

(geology)

A suborder of the soil order Ultisol; seasonally wet, it is saturated with water a significant part of the year unless drained; surface horizon of the soil profile is dark and varies in thickness, grading to gray in the deeper portions; it occurs in depressions or on wide upland flats from which water drains very slowly.

References in periodicals archive

In the USDA Soil Taxonomy (Soil Survey Staff 2006), these soils would correspond to Alfisols (Xeralfs and to a lesser extent Aqualfs and Ustalfs) for the higher base status soils, and Ultisols (Ustults and to a lesser extent Aquults and Xerults) for the more acidic, lower base status soils.

High clay contents, dense soils, and spatial variability are the principal subsoil constraints to cropping the higher rainfall land in south-eastern Australia

The dominant suborders of Ultisols are Aquults, Humults, Udults, Ustults, and Xerults (Table 3-5).

* Aquults are Ultisols forming in wet areas in which groundwater is close to the surface during part of the year (usually winter and spring).

Chapter 3 Soil taxonomy and classification

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