Duraquod
A soil profile of a poorly drained Duraquod, the Woodlyn soil series in Washington State. This soil has an ochric epipedon that has been plowed to a depth of about 25 to 30 cm. The subsoil below a depth of about 45 to 50 cm is a spodic horizon cemented by an accumulation of iron and organic matter. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
These soils have a cemented soil layer that in many areas is a combination of iron and/or aluminum and organic matter. In some of these soils, silica also is a cementing agent. Duraquods are seasonally saturated above the cemented soil layer but not necessarily below it. In the United States, these soils occur mostly in the Pacific Northwest and in the Lakes States region. They also are known to occur in New Zealand, in areas of kauri trees. The cemented soil layer in Duraquods severely restricts plant rooting. Currently, few of these soils are recognized worldwide.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
For a detailed soil description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/W/WOODLYN.html
Duraquod
A soil profile of a poorly drained Duraquod, the Woodlyn soil series in Washington State. This soil has an ochric epipedon that has been plowed to a depth of about 25 to 30 cm. The subsoil below a depth of about 45 to 50 cm is a spodic horizon cemented by an accumulation of iron and organic matter. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
These soils have a cemented soil layer that in many areas is a combination of iron and/or aluminum and organic matter. In some of these soils, silica also is a cementing agent. Duraquods are seasonally saturated above the cemented soil layer but not necessarily below it. In the United States, these soils occur mostly in the Pacific Northwest and in the Lakes States region. They also are known to occur in New Zealand, in areas of kauri trees. The cemented soil layer in Duraquods severely restricts plant rooting. Currently, few of these soils are recognized worldwide.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
For a detailed soil description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/W/WOODLYN.html