1. Do not have a glossic, kandic, or natric horizon; 2. Have an argillic horizon that in some part has hue of 5YR or yellower, a color value, moist, of 3.5 or more, or a color value, dry, more than 1 unit higher than the moist value; 3. Do not have a fragipan within 100 cm of the mineral soil surface; 4. Either have a densic, lithic, or paralithic contact within 150 cm of the soil surface or have a clay distribution in which the clay content decreases with increasing depth by 20 percent or more from its maximum within 150 cm of the soil surface and, if there is a clay increase of 3 percent or more (absolute) below that layer, less than 5 percent of the volume in the layer where the clay content decreases consists of skeletans on faces of peds, if: a. Hue is redder than 10YR and chroma of more than 4 is dominant; b. Hue is 2.5YR or redder, the value, moist, is less than 4, and the value, dry, is less than 5 throughout the major part of the argillic horizon; or c. There are many coarse redox concentrations that have hue redder than 7.5YR or chroma of more than 5.
1. One or both of the following: a. Cracks within 125 cm of the mineral soil surface that are 5 mm or more wide through a thickness of 30 cm or more for some time in normal years, and slickensides or wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or b. A linear extensibility of 6.0 cm or more between the mineral soil surface and either a depth of 100 cm or a densic, lithic, or paralithic contact, whichever is shallower; and 2. Redox depletions with chroma of 2 or less in layers that also have aquic conditions in normal years (or artificial drainage) either: a. Within the upper 25 cm of the argillic horizon if its upper boundary is within 50 cm of the mineral soil surface; or b. Within 75 cm of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface; and 3. An Ap horizon or materials between the mineral soil surface and a depth of 18 cm that, after mixing, have one or more of the following: a. A color value, moist, of 4 or more; or b. A color value, dry, of 6 or more; or c. Chroma of 4
or more.
1. One or both of the following: a. Cracks within 125 cm of the mineral soil surface that are 5 mm or more wide through a thickness of 30 cm or more for some time in normal years, and slickensides or wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or b. A linear extensibility of 6.0 cm or more between the mineral soil surface and either a depth of 100 cm or a densic, lithic, or paralithic contact, whichever is shallower; and 2. Redox depletions with chroma of 2 or less in layers that also have aquic conditions in normal years (or artificial drainage) either: a. Within the upper 25 cm of the argillic horizon if its upper boundary is within 50 cm of the mineral soil surface; or b. Within 75 cm
of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface.
1. Saturation with water in one or more layers within 100 cm of the mineral soil surface in normal years for either or both: a. 20 or more consecutive days; or b. 30 or more cumulative days; and 2. One or both of the following: a. Cracks within 125 cm of the mineral soil surface that are 5 mm or more wide through a thickness of 30 cm or more for some time in normal years, and slickensides or wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or b. A linear extensibility of 6.0 cm or more between the mineral soil surface and either a
depth of 100 cm or a densic, lithic, or paralithic
contact, whichever is shallower.
1. One or both of the following: b. A linear extensibility of 6.0 cm or more between the mineral soil surface and either a depth of 100 cm or a densic, lithic, or paralithic contact, whichever is shallower; and 2. An Ap horizon or materials between the mineral soil surface and a depth of 18 cm that, after mixing, have one or more of the following: a. A color value, moist, of 4 or more; or b. A color value, dry, of 6 or more; or c. Chroma of 4
or more.
1. Cracks within 125 cm of the mineral soil surface that are 5 mm or more wide through a thickness of 30 cm or more for some time in normal years, and slickensides or wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or 2. A linear
extensibility of 6.0 cm or more between the mineral soil
surface and either a depth of 100 cm or a densic, lithic,
or paralithic contact, whichever is shallower.
1. More than 35 percent (by volume) fragments coarser than 2.0 mm, of which more than 66 percent is cinders, pumice, and pumicelike fragments; or 2. A fine-earth fraction containing 30 percent or more particles 0.02 to 2.0 mm in diameter; and a. In the 0.02 to 2.0 mm fraction, 5 percent or more volcanic glass; and b. [(Al plus 1/2
Fe, percent extracted by ammonium oxalate) times 60] plus
the volcanic glass (percent) is equal to 30 or more.
1. Fragic soil properties: a. In 30 percent or more of the volume of a layer 15 cm or more thick that has its upper boundary within 100 cm of the mineral soil surface; or b. In 60 percent or more of the volume of a layer 15 cm or more thick; and 2. Redox depletions with chroma of 2 or less in layers that also have aquic conditions in normal years (or artificial drainage) either: a. Within the upper 25 cm of the argillic horizon if its upper boundary is within 50 cm of the mineral soil surface; or b. Within 75 cm
of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface.
1. Fragic soil properties: a. In 30 percent or more of the volume of a layer 15 cm or more thick that has its upper boundary within 100 cm of the mineral soil surface; or b. In 60 percent or more of the volume of a layer 15 cm or more thick; and 2. Saturation with water in one or more layers within 100 cm of the mineral soil surface in normal years for either or both: a. 20 or more consecutive days; or b. 30 or more
cumulative days.
1. In one or more horizons within 75 cm of the mineral soil surface, redox depletions with chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage); and 2. A sandy or
sandy-skeletal particle-size class throughout a layer extending from the
mineral soil surface to the top of an argillic horizon at a depth of 50 cm or more.
1. An abrupt textural change; and b. Within 75 cm of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface; and 3. A base
saturation (by sum of cations) of less than 60 percent at
a depth of 125 cm from the top of the argillic horizon, at
a depth of 180 cm from the mineral soil surface, or
directly above a densic, lithic, or paralithic contact, whichever is
shallowest.
1. An abrupt textural change; and b. Within 75 cm
of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface.
1. Interfingering of albic materials in the upper part of the argillic horizon; and b. Within 75 cm
of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface.
1. Redox depletions with chroma of 2 or less in layers that also have aquic conditions in normal years (or artificial drainage) either: b. Within 75 cm of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface; and 2. A base
saturation (by sum of cations) of less than 60 percent at
a depth of 125 cm from the top of the argillic horizon, at
a depth of 180 cm from the mineral soil surface, or
directly above a densic, lithic, or paralithic contact, whichever is
shallowest.
1. An Ap horizon that has a color value, moist, of 3 or less and a color value, dry, of 5 or less (crushed and smoothed sample) or materials between the soil surface and a depth of 18 cm that have these color values after mixing; and b. Within 75 cm
of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface.
1. Within the upper 25 cm of the argillic horizon if its upper boundary is within 50 cm of the mineral soil surface; or 2. Within 75 cm of the mineral soil surface if the upper boundary of the
argillic horizon is 50 cm or more below the mineral soil
surface.
1. 20 or more consecutive days; or 2. 30 or more
cumulative days.
1. In 30 percent or more of the volume of a layer 15 cm or more thick that has its upper boundary within 100 cm of the mineral soil surface; or 2. In 60 percent or more of the volume of a layer 15
cm or more thick.
1. Consists entirely of lamellae; or 2. Is a combination of two or more lamellae and one or more subhorizons with a thickness of 7.5 to 20 cm, each layer with an overlying eluvial horizon; or 3. Consists of one or more subhorizons that are more than 20 cm thick, each with an overlying eluvial horizon, and above these horizons there are either: a. Two or more lamellae with a combined thickness of 5 cm or more (that may or may not be part of the argillic horizon); or b. A combination of lamellae (that
may or may not be part of the argillic horizon) and one or more parts of the
argillic horizon 7.5 to 20 cm thick,
each with an overlying eluvial horizon.
1. An argillic, kandic, or natric horizon that is 35 cm or less thick; and 2. No densic,
lithic, or paralithic contact within 100 cm of the mineral
soil surface.
the top of the argillic horizon, at
a depth of 180 cm below the mineral soil surface, or
directly above a densic, lithic, or paralithic contact, whichever is
shallowest.
1. Do not have a lithic contact within 50 cm of the soil surface; 2. Do not have either: b. A linear extensibility of 6.0 cm or more between the mineral soil surface and either a depth of 100 cm or a densic, lithic, or paralithic contact, whichever is shallower; 3. Do not have, throughout a cumulative thickness of 18 cm or more and within a depth of 75 cm, one or more of the following: a. A bulk density, in the fraction less than 2.0 mm in size, of 1.0 g/cm3 or less, measured at 33 kPa water retention, and acid-oxalate-extractable aluminum plus 1/2 acid-oxalateextractable iron of more than 1.0 percent; or b. Fragments coarser than 2.0 mm constituting more than 35 percent of the whole soil and cinders, pumice, and pumicelike fragments making up more than 66 percent of these fragments; or c. A fine-earth fraction containing 30 percent or more particles 0.02 to 2.0 mm in diameter; and (1) In the 0.02 to 2.0 mm fraction, 5 percent or more volcanic glass; and (2) [(Al plus 1/2 Fe, percent extracted by ammonium oxalate) times 60] plus the volcanic glass (percent) is equal to 30 or more; 4. Do not have redox depletions with chroma of 2 or less in layers that also have aquic conditions in normal years (or artificial drainage) either: b. Within 75 cm of the mineral soil surface if the upper boundary of the argillic horizon is 50 cm or more below the mineral soil surface; 5. Are not saturated with water in any layer within 100 cm of the mineral soil surface for 7 or more consecutive days or 20 or more cumulative days in normal years; 6. Do not have anthraquic conditions; 7. Have a texture finer than loamy fine sand in one or more subhorizons within 50 cm of the mineral soil surface; 8. Do not have a mollic epipedon, an Ap horizon that meets all of the requirements for a mollic epipedon except thickness, or materials between the soil surface and a depth of 18 cm that meet these requirements after mixing; 9. Have an argillic horizon that is finer than the sandy particle-size class in some part of the upper 75 cm if the argillic horizon is more than 75 cm thick or in any part if the argillic horizon is less than 75 cm thick; 10. Have a base saturation (by sum of cations) of 60 percent or more at a depth of 125 cm below the top of the argillic horizon, at a depth of 180 cm below the soil surface, or directly above a densic, lithic, or paralithic contact, whichever is shallowest; 11. Do not have interfingering of albic materials in any subhorizon of the argillic horizon; 12. Have an argillic horizon that meets none of the following: a. Consists entirely of lamellae; or b. Is a combination of two or more lamellae and one or more subhorizons with a thickness of 7.5 to 20 cm, each layer with an overlying eluvial horizon; or c. Consists of one or more subhorizons that are more than 20 cm thick, each with an overlying eluvial horizon, and above these horizons there are either: (1) Two or more lamellae with a combined thickness of 5 cm or more (that may or may not be part of the argillic horizon); or (2) A combination of lamellae (that may or may not be part of the argillic horizon) and one or more parts of the argillic horizon 7.5 to 20 cm thick, each with an overlying eluvial horizon; 13. Have an argillic horizon that is more than 35 cm thick; and 14. Have fragic soil properties: a. In less than 30 percent of the volume of all layers 15 cm or more thick that have an upper boundary within 100 cm of the mineral soil surface; and b. In less than 60 percent of the volume of all layers 15 cm or more thick. pages by <SoClaimon> sootin claimon : sootinc@gmail.com |