Ultisols are intensely weathered soils of warm and humid climates. They are typically formed on older geologic locations in parent material that is already. The central concept of Ultisols is that of soils that have a horizon that contains an appreciable amount of translocated silicate clay (an argillic or kandic horizon). Ultisols (from the Latin ultimus – last) are soils that have formed in humid areas and are intensely weathered. They typically contain a subsoil horizon that has an appreciable amount of translocated clay, and are relatively acidic.


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Xerults Xerults are the more or less freely drained Ultisols of Mediterranean climates.

They are in California and Oregon. The ultisol soil formerly was and currently is mostly coniferous forest.

Ultisols - an overview | ScienceDirect Topics

Most of these soils are used as forest, but some have been cleared and ultisol soil used as cropland or pasture. Tile drainage systems are commonly used to make Aquults suitable for agricultural production.


Mean annual precipitation ranges between approximatelymm inches. The thick argillic diagnostic horizon Btg typically has sandy ultisol soil loam or clay loam textures and extends ultisol soil a depth of approximately cm inchesresulting in the Pale- great group classification.


A water table is at or near the ultisol soil surface for much of the year. Where drained, these soils are used for production of corn, soybeans and small grains.


Perhaps the most notable feature of this soil is the Ap and E horizons, which have sand textures and a combined thickness greater than cm 40 inches resulting in the Grossarenic subgroup classification. The kandic horizon Bt ultisol soil to a ultisol soil beyond cm and includes a zone of plinthite Btv.

The ultisol soil kandic diagnostic horizon Bt, Btv differs from an argillic horizon in that is dominated by low-activity clays. There are two soil series in Maui of agricultural importance which are characteristic.

Ultisols | Soil Science Society of America

The Haiku series, located in the uplands ultisol soil Ulumalu, occupies 5, acres in land area. The elevation of the Haiku series ranges from sea level to 1, ft. Clay, silty clay Rainfall and Temperature: The average annual rainfall is 50 to 80 inches, and the average annual temperature is 72 degrees F.

The well-developed, extensively leached ultisol soil horizons are enriched in kaolin -group clay minerals and in metal oxides and appear as red or bleached layers.

They show low interference colours typical for kaolinite, which often is masked by iron oxides Fig.

The addition of organic material also helps to improve the drainage of the soil and also helps to decrease the overall weight of the soil [11]. A garden planted in a raised bed. However, microorganisms in the soil consume the ultisol soil nutrients that plants use to grow so certain nutrients will remain unavailable to plants until the microorganisms completely ultisol soil down the organic material and release nutrients [12].

Ultisol - an overview | ScienceDirect Topics

Living organisms within the soil use, and subsequently convert, organic material into usable humus [13]. To avoid the delay presented by this process, adding manure in the fall is ultisol soil [14]. Some gardeners who live in areas with large amounts of red ultisol soil soil use raise beds to avoid having to amend the soil [15].