JE.Udalfs

Key to Great Groups

JEA. Udalfs that have a natric horizon. Natrudalfs, p. 56

JEB. Other Udalfs that have:
1. A glossic horizon; and
2. In the argillic or kandic horizon, discrete nodules, 2.5 to 30 cm in diameter, that:
a. Are enriched with iron and extremely weakly cemented to indurated; and
b. Have exteriors with either a redder hue or a higher chroma than the interiors. Ferrudalfs, p. 49

JEC. Other Udalfs that have both:
1. A glossic horizon; and
2. A fragipan with an upper boundary within 100 cm of the mineral soil surface. Fraglossudalfs, p. 49

JED. Other Udalfs that have a fragipan with an upper boundary within 100 cm of the mineral soil surface. Fragiudalfs, p. 49

JEE. Other Udalfs that:
1. Do not have a densic, lithic, paralithic, or petroferric contact within 150 cm of the mineral soil surface; and
2. Have a kandic horizon; and
3. Within 150 cm of the mineral soil surface, either:
a. Do not have a clay decrease with increasing depth of 20 percent or more (relative) from the maximum clay content [Clay is measured noncarbonate clay or based on the following formula: Clay % = 2.5(% water retained at 1500 kPa tension - % organic carbon), whichever value is greater, but no more than 100]; or
b. Have 5 percent or more (by volume) skeletans on faces of peds in the layer that has a 20 percent lower clay content and, below that layer, a clay increase of 3 percent or more (absolute) in the fine-earth fraction. Kandiudalfs, p. 55

JEF. Other Udalfs that have a kandic horizon. Kanhapludalfs, p. 56

JEG. Other Udalfs that:
1. Do not have a densic, lithic, or paralithic contact within 150 cm of the mineral soil surface; and
2. Within 150 cm of the mineral soil surface, either:
a. Do not have a clay decrease with increasing depth of 20 percent or more (relative) from the maximum clay content [Clay is measured noncarbonate clay or based on the following formula: Clay % = 2.5(% water retained at 1500 kPa tension - % organic carbon), whichever value is greater, but no more than 100]; or
b. Have 5 percent or more (by volume) skeletans on faces of peds in the layer that has a 20 percent lower clay content and, below that layer, a clay increase of 3 percent or more (absolute) in the fine-earth fraction; and
3. Have an argillic horizon with one or more of the following:
a. In 50 percent or more of the matrix of one or more subhorizons in its lower one-half, hue of 7.5YR or redder and chroma of 5 or more; or
b. In 50 percent or more of the matrix of horizons that total more than one-half the total thickness, hue of 2.5YR or redder, value, moist, of 3 or less, and value, dry, of 4 or less; or
c. Many coarse redox concentrations with hue of 5YR or redder or chroma of 6 or more, or both, in one or more subhorizons; or
4. Have a frigid temperature regime and all of the following:
a. An argillic horizon that has its upper boundary 60 cm or more below both:
(1) The mineral soil surface; and
(2) The lower boundary of any surface mantle containing 30 percent or more vitric volcanic ash, cinders, or other vitric pyroclastic materials; and
b. A texture (in the fine-earth fraction) finer than loamy fine sand in one or more horizons above the argillic horizon; and
c. Either a glossic horizon or interfingering of albic materials into the argillic horizon. Paleudalfs, p. 57

JEH. Other Udalfs that have, in all subhorizons in the upper 100 cm of the argillic horizon or throughout the entire argillic horizon if less than 100 cm thick, more than 50 percent colors that have all of the following:
1. Hue of 2.5YR or redder; and
2. Value, moist, of 3 or less; and
3. Dry value no more than 1 unit higher than the moist value. Rhodudalfs, p. 59

JEI. Other Udalfs that have a glossic horizon. Glossudalfs, p. 50

JEJ. Other Udalfs. Hapludalfs, p. 51

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