Key to SubgroupsIFFA. Haploxerolls that have both:1. A lithic contact within 50 cm of the mineral soil surface; and 2. A base saturation (by sum of cations) of 75 percent or less in one or more horizons between either the mineral soil surface or an Ap horizon, whichever is deeper, and the lithic contact. Soil Families and Soil Series in Subgroup IFFB. Other Haploxerolls that have a lithic contact within 50 cm of the mineral soil surface. Lithic HaploxerollsSoil Families and Soil Series in Subgroup IFFC. Other Haploxerolls that have both:1. An aridic moisture regime; 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. Soil Families and Soil Series in Subgroup IFFD. Other Haploxerolls that have one or both of the following: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 wedgeshaped 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. Soil Families and Soil Series in Subgroup IFFE. Other Haploxerolls that have throughout one or more horizons with a total thickness of 18 cm or more within 75 cm of the mineral soil surface, a fine-earth fraction with both a bulk density of 1.0 g/cm3 or less, measured at 33 kPa water retention, and Al plus 1/2 Fe percentages (by ammonium oxalate) totaling more than 1.0. Andic HaploxerollsSoil Families and Soil Series in Subgroup IFFF. Other Haploxerolls that have both:1. An aridic moisture regime; and 2. Throughout one or more horizons with a total thickness of 18 cm or more within 75 cm of the mineral soil surface, one or both of the following: a. 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 b. 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. Soil Families and Soil Series in Subgroup IFFG. Other Haploxerolls that have, throughout one or more horizons with a total thickness of 18 cm or more within 75 cm of the mineral soil surface, one or both of the following: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. Soil Families and Soil Series in Subgroup IFFH. Other Haploxerolls that have:1. A mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand; and 2. An irregular decrease in organic-carbon content from a depth of 25 cm below the mineral soil surface to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower; and 3. A slope of less than 25 percent; and 4. 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). Soil Families and Soil Series in Subgroup IFFI. Other Haploxerolls that have:1. A mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand; and 2. An irregular decrease in organic-carbon content from a depth of 25 cm below the mineral soil surface to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower; and 3. A slope of less than 25 percent; and 4. A base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Soil Families and Soil Series in Subgroup IFFJ. Other Haploxerolls that have:1. A mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand; and 2. An irregular decrease in organic-carbon content from a depth of 25 cm below the mineral soil surface to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower; and 3. A slope of less than 25 percent. Soil Families and Soil Series in Subgroup IFFK. Other Haploxerolls that have both: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 slope of less than 25 percent; and either a. An organic-carbon content of 0.3 percent or more in all horizons within 125 cm of the mineral soil surface; or b. An irregular decrease in organic-carbon content from a depth of 25 cm to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower. Soil Families and Soil Series in Subgroup IFFL. Other Haploxerolls that have both: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 horizon, 15 cm or more thick within 100 cm of the mineral soil surface, that either has 20 percent or more (by volume) durinodes or is brittle and has a firm ruptureresistance class when moist. Soil Families and Soil Series in Subgroup IFFM. Other Haploxerolls that have both: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 base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Soil Families and Soil Series in Subgroup IFFN. Other Haploxerolls that have, 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). Aquic HaploxerollsSoil Families and Soil Series in Subgroup IFFO. Other Haploxerolls that in normal years are saturated with water in one or more layers within 100 cm of the mineral soil surface for either or both:1. 20 or more consecutive days; or 2. 30 or more cumulative days. Soil Families and Soil Series in Subgroup IFFP. Other Haploxerolls that have both:1. A mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand; and 2. A calcic horizon or identifiable secondary carbonates within one of the following particle-size class (by weighted average in the particle-size control section) and depth combinations: a. Sandy or sandy-skeletal and within 150 cm of the mineral soil surface; or b. Clayey, clayey-skeletal, fine, or very-fine and within 90 cm of the mineral soil surface; or c. Any other class and within 110 cm of the mineral soil surface. Soil Families and Soil Series in Subgroup IFFQ. Other Haploxerolls that have both:1. A mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand; and 2. A base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Soil Families and Soil Series in Subgroup IFFR. Other Haploxerolls that have a mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand. Pachic HaploxerollsSoil Families and Soil Series in Subgroup IFFS. Other Haploxerolls that have:1. An aridic moisture regime; and 2. A slope of less than 25 percent; and either a. An organic-carbon content of 0.3 percent or more in all horizons within 125 cm of the mineral soil surface; or b. An irregular decrease in organic-carbon content from a depth of 25 cm to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower. Soil Families and Soil Series in Subgroup IFFT. Other Haploxerolls that have both:1. An aridic moisture regime; and 2. A horizon within 100 cm of the mineral soil surface that is 15 cm or more thick and either has 20 percent or more (by volume) durinodes or is brittle and has a firm ruptureresistance class when moist. Soil Families and Soil Series in Subgroup IFFU. Other Haploxerolls that have both:1. An aridic moisture regime; and 2. A calcic horizon or identifiable secondary carbonates within one of the following particle-size class (by weighted average in the particle-size control section) and depth combinations: a. Sandy or sandy-skeletal and within 150 cm of the mineral soil surface; or b. Clayey, clayey-skeletal, fine, or very-fine and within 90 cm of the mineral soil surface; or c. Any other class and within 110 cm of the mineral soil surface. Soil Families and Soil Series in Subgroup IFFV. Other Haploxerolls that have both:1. An aridic moisture regime; and 2. A sandy particle-size class in all horizons within 100 cm of the mineral soil surface. Soil Families and Soil Series in Subgroup IFFW. Other Haploxerolls that:1. Have an aridic moisture regime; and 2. Either: a. Do not have a cambic horizon and do not, in any part of the mollic epipedon below 25 cm from the mineral soil surface, meet all of the requirements for a cambic horizon except color; or b. Have free carbonates throughout the cambic horizon or in all parts of the mollic epipedon below a depth of 25 cm from the mineral soil surface. Soil Families and Soil Series in Subgroup IFFX. Other Haploxerolls that have an aridic moisture regime. Aridic HaploxerollsSoil Families and Soil Series in Subgroup IFFY. Other Haploxerolls that have a horizon within 100 cm of the mineral soil surface that is 15 cm or more thick and either has 20 percent or more (by volume) durinodes or is brittle and has a firm rupture-resistance class when moist. Duric HaploxerollsSoil Families and Soil Series in Subgroup IFFZ. Other Haploxerolls that have a sandy particle-size class in all horizons within 100 cm of the mineral soil surface. Psammentic HaploxerollsSoil Families and Soil Series in Subgroup IFFZa. Other Haploxerolls that have a slope of less than 25 percent; and either1. An organic-carbon content of 0.3 percent or more in all horizons within 125 cm of the mineral soil surface; or 2. An irregular decrease in organic-carbon content from a depth of 25 cm to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower. Soil Families and Soil Series in Subgroup IFFZb. Other Haploxerolls that have a mollic epipedon that has granular structure and that has, below any Ap horizon, 50 percent or more (by volume) wormholes, wormcasts, or filled animal burrows. Vermic HaploxerollsSoil Families and Soil Series in Subgroup IFFZc. Other Haploxerolls that have a calcic horizon or identifiable secondary carbonates within one of the following particle-size class (by weighted average in the particle-size control section) and depth combinations:1. Sandy or sandy-skeletal and within 150 cm of the mineral soil surface; or 2. Clayey, clayey-skeletal, fine, or very-fine and within 90 cm of the mineral soil surface; or 3. Any other class and within 110 cm of the mineral soil surface. Soil Families and Soil Series in Subgroup IFFZd. Other Haploxerolls that:1. Do not have a cambic horizon and do not, in the lower part of the mollic epipedon, meet all of the requirements for a cambic horizon except color; and 2. Have a base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Soil Families and Soil Series in Subgroup IFFZe. Other Haploxerolls that have a base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Ultic HaploxerollsSoil Families and Soil Series in Subgroup IFFZf. Other Haploxerolls that either:1. Do not have a cambic horizon and do not, in any part of the mollic epipedon below 25 cm from the mineral soil surface, meet all of the requirements for a cambic horizon except color; or 2. Have free carbonates throughout the cambic horizon or in all parts of the mollic epipedon below a depth of 25 cm from the mineral soil surface. Soil Families and Soil Series in Subgroup IFFZg. Other Haploxerolls. Typic HaploxerollsSoil Families and Soil Series in Subgroup pages by sootin claimon : sootinc@gmail.com |