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A Stagnosol in the World Reference Base for Soil Resources (WRB) is soil with strong mottling of the soil profile due to redox caused by stagnating surface water. Stagnosols are periodically wet and Gley soil in the topsoil and subsoil, with or without and/or bleaching. The topsoil can also be completely bleached (albic soil horizon). A common name in many national classification systems for most Stagnosols is pseudogley. In the USDA soil taxonomy, many of them belong to the Aqualfs, Aquults, Aquents, Aquepts and Aquolls.
They are developed in a wide variety of unconsolidated materials like glacial till, and aeolian, alluvial and colluvium sediment and weathering siltstone. Stagnosols occur on flat to gently sloping land in cool temperate to Subtropics regions with humid to perhumid climate conditions.
The agriculture suitability of Stagnosols is limited because of their oxygen deficiency resulting from stagnating water above a dense subsoil. Therefore, they have to be drained. However, in contrast to Gleysols, drainage with channels or pipes is in many cases insufficient. It is necessary to have a higher porosity in the subsoil in order to improve the hydraulic conductivity. This may be achieved by deep loosening or deep ploughing. Drained Stagnosols can be owing to their moderate degree of leaching.
Stagnosols cover 150–200 million ha worldwide. For the greater part in humid to perhumid temperate regions of Western Europe and Central Europe, North America, southeast Australia and Argentina. Here Stagnosols are associated with Luvisols as well as to Cambisols and Umbrisols. They also occur in humid to perhumid subtropical regions, where they are associated with Acrisols and Planosols. with a light-coloured, Soil texture, surface Soil horizon that shows signs of periodic water stagnation and abruptly overlies a dense, slowly permeable subsoil with significantly more clay than the surface horizon. In the US Soil Classification of 1938 used the name Planosols, whereas its successor, the USDA soil taxonomy, includes most Planosols in the Great Groups Albaqualfs, Albaquults and Argialbolls.
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