DBE.Vitricryands

Key to Great Groups 

DBE. Other Cryands that have a 1500 kPa water retention of less than 15 percent on air-dried samples and less than 30 percent on undried samples throughout 60 percent or more of the thickness either:

1. Within 60 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower, if there is no densic, lithic, or paralithic contact, duripan, or petrocalcic horizon within that depth; or

2. Between either the mineral soil surface or the top of an organic layer with andic soil properties, whichever is shallower, and a densic, lithic, or paralithic contact, a duripan, or a petrocalcic horizon. Vitricryands, p. 292 

DBE. Vitricryands are the Cryands that have a 1500 kPa water retention of less than 15 percent on air-dried samples and less than 30 percent on undried samples throughout 60 percent or more of the upper 60 cm of the andic materials. These soils do not have a melanic epipedon or a layer that meets the depth, thickness, and organic-carbon requirements for a melanic epipedon. They do not have, in 75 percent or more of each pedon, a cemented horizon that has its upper boundary within 100 cm of either the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower. Characteristically, Vitricryands have a thin O horizon; an ochric, mollic, or umbric epipedon; and a cambic horizon. The Vitricryands in the United States generally developed in Holocene deposits. Most formed under coniferous forest vegetation. 

Definition 

Vitricryands are the Cryands that:

1. Have, in less than 75 percent of each pedon, a cemented horizon that has its upper boundary within 100 cm of either the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower;

2. Do not have a melanic epipedon or an epipedon meeting the depth, thickness, and organic-carbon requirements for a melanic epipedon; and

3. Have a 1500 kPa water retention of less than 15 percent on air-dried samples and less than 30 percent on undried samples

throughout 60 percent or more of the thickness either:

                a. Within 60 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower, if there is no densic, lithic, or paralithic contact, duripan, or petrocalcic horizon within that depth; or

                b. Between either the mineral soil surface or the top of an organic layer with andic soil properties, whichever is shallower, and a densic, lithic, or paralithic contact, a duripan, or a petrocalcic horizon. 

Key to Subgroups 

DBEA. Vitricryands that have a lithic contact within 50 cm either of the mineral soil surface or of the top of an organic layer that has andic soil properties, whichever is shallower. Lithic Vitricryands 

DBEB. Other Vitricryands 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 Vitricryands 

DBEC. Other Vitricryands that are saturated with water in one or more layers within 100 cm of the mineral soil surface in normal years for either or both:

1. 20 or more consecutive days; or

2. 30 or more cumulative days. Oxyaquic Vitricryands 

DBED. Other Vitricryands 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 Vitricryands 

DBEE. Other Vitricryands that have a xeric moisture regime and a mollic or umbric epipedon. Humic Xeric Vitricryands 

DBEF. Other Vitricryands that have a xeric moisture regime. Xeric Vitricryands 

DBEG. Other Vitricryands that have an argillic or kandic horizon that has both:

1. An upper boundary within 125 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower; and

2. A base saturation (by sum of cations) of less than 35 percent throughout the upper 50 cm or throughout the entire argillic or kandic horizon if it is less than 50 cm thick. Ultic Vitricryands 

DBEH. Other Vitricryands that have an argillic or kandic horizon that has its upper boundary within 125 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower. Alfic Vitricryands 

DBEI. Other Vitricryands that have a mollic or umbric epipedon. Humic Vitricryands 

DBEJ. Other Vitricryands. Typic Vitricryands 

Definition of Typic Vitricryands 

Typic Vitricryands are the Vitricryands that:

1. Do not have a lithic contact within 50 cm of the soil surface;

2. Do not have, in any horizon 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, both aquic conditions and any of the following:

                a. 2 percent or more redox concentrations; or

                b. 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

                c. Enough active ferrous iron to give a positive reaction to alpha,alpha-dipyridyl at a time when the soil is not being irrigated;

3. Do not have, between depths of 25 and 100 cm, a layer 10 cm or more thick with more than 3.0 percent organic carbon and the colors of a mollic epipedon throughout, occurring below a horizon or horizons 10 cm or more thick with a color value 1 unit or more higher and an organic-carbon content 1 percent or more lower;

4. Do not have a xeric moisture regime;

5. Do not have an argillic or kandic horizon with its upper boundary within 125 cm of the mineral soil surface or of the upper boundary of an organic layer that has andic soil properties, whichever is shallower;

6. Do not have a mollic or umbric epipedon; and

7. Are not saturated with water in one or more layers within 100 cm of the mineral soil surface for 20 or more consecutive days or 30 or more cumulative days in normal years.

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