DGA.Durustands

Key to Subgroups

DGAA. Durustands that have, in one or more horizons at a depth between 50 and 100 cm either from the mineral soil surface or from the top of an organic layer with andic soil properties, whichever is shallower, aquic conditions for some time in normal years (or artificial drainage) and one or more of the following:
1. 2 percent or more redox concentrations; or
2. A color value, moist, of 4 or more and 50 percent or more chroma of 2 or less either in redox depletions on faces of peds or in the matrix if peds are absent; or
3. Enough active ferrous iron to give a positive reaction to alpha,alpha-dipyridyl at a time when the soil is not being irrigated. Aquic Durustands
Soil Families and Soil Series in Subgroup

DGAB. Other Durustands that have, at a depth between 25 and 100 cm either from the mineral soil surface or from the top of an organic layer with andic soil properties, whichever is shallower, a layer 10 cm or more thick with more than 3.0 percent organic carbon and the colors of a mollic epipedon throughout, underlying one or more horizons with a total thickness of 10 cm or more that have a color value, moist, 1 unit or more higher and an organic-carbon content 1 percent or more (absolute) lower. Thaptic Durustands
Soil Families and Soil Series in Subgroup

DGAC. Other Durustands that have a melanic, mollic, or umbric epipedon. Humic Durustands
Soil Families and Soil Series in Subgroup

DGAD. Other Durustands. Typic Durustands
Soil Families and Soil Series in Subgroup

pages by sootin claimon : sootinc@gmail.com
Comments