Key to SubgroupsGFBA. Haplocalcids that have:1. A lithic contact within 50 cm of the soil surface; and 2. A moisture control section that is dry in all parts for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and a soil moisture regime that borders on xeric. Soil Families and Soil Series in Subgroup GFBB. Other Haplocalcids that have:1. A lithic contact within 50 cm of the soil surface; and 2. A moisture control section that is dry in all parts for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and a soil moisture regime that borders on ustic. Soil Families and Soil Series in Subgroup GFBC. Other Haplocalcids that have a lithic contact within 50 cm of the soil surface. Lithic HaplocalcidsSoil Families and Soil Series in Subgroup GFBD. Other Haplocalcids that have:1. Cracks within 125 cm of the 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 soil surface; or 2. A linear extensibility of 6.0 cm or more between the 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 GFBE. Other Haplocalcids that:1. Are either: a. Irrigated and have aquic conditions for some time in normal years in one or more layers within 100 cm of the soil surface; or b. Saturated with water in one or more layers within 100 cm of the soil surface for 1 month or more in normal years; and 2. Have one or more horizons, within 100 cm of the soil surface and with a combined thickness of 15 cm or more, that contain 20 percent or more (by volume) durinodes or are brittle and have at least a firm rupture-resistance class when moist. Soil Families and Soil Series in Subgroup GFBF. Other Haplocalcids that are either:1. Irrigated and have aquic conditions for some time in normal years in one or more layers within 100 cm of the soil surface; or 2. Saturated with water in one or more layers within 100 cm of the soil surface for 1 month or more in normal years. Soil Families and Soil Series in Subgroup GFBG. Other Haplocalcids that have:1. A duripan that has its upper boundary within 150 cm of the surface; and 2. A moisture control section that is dry in all parts for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and a soil moisture regime that borders on xeric. Soil Families and Soil Series in Subgroup GFBH. Other Haplocalcids that have a duripan that has its upper boundary within 150 cm of the surface. Duric HaplocalcidsSoil Families and Soil Series in Subgroup GFBI. Other Haplocalcids that have:1. One or more horizons, within 100 cm of the soil surface and with a combined thickness of 15 cm or more, that contain 20 percent or more (by volume) durinodes or are brittle and have at least a firm rupture-resistance class when moist; and 2. A moisture control section that is dry in all parts for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and a soil moisture regime that borders on xeric. Soil Families and Soil Series in Subgroup GFBJ. Other Haplocalcids that have one or more horizons, within 100 cm of the soil surface and with a combined thickness of 15 cm or more, that contain 20 percent or more (by volume) durinodes or are brittle and have at least a firm ruptureresistance class when moist. Durinodic HaplocalcidsSoil Families and Soil Series in Subgroup GFBK. Other Haplocalcids that have:1. One or more horizons, within 100 cm of the soil surface and with a combined thickness of 15 cm or more, that contain 20 percent or more (by volume) nodules or concretions; and 2. A moisture control section that is dry in all parts for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and a soil moisture regime that borders on xeric. Soil Families and Soil Series in Subgroup GFBL. Other Haplocalids that:1. Have one or more horizons, within 100 cm of the soil surface and with a combined thickness of 15 cm or more, that contain 20 percent or more (by volume) nodules or concretions; and 2. Are dry in all parts of the moisture control section for less than three-fourths of the time (cumulative) when the soil temperature at a depth of 50 cm is 5 oC or higher and have a soil moisture regime that borders on ustic. Soil Families and Soil Series in Subgroup GFBM. Other Haplocalcids that have one or more horizons, within 100 cm of the soil surface and with a combined thickness of 15 cm or more, that contain 20 percent or more (by volume) nodules or concretions. Petronodic HaplocalcidsSoil Families and Soil Series in Subgroup GFBN. Other Haplocalcids that have both:1. A horizon at least 25 cm thick within 100 cm of the soil surface that has an exchangeable sodium percentage of 15 or more (or an SAR of 13 or more) during at least 1 month in normal years; and 2. A moisture control section that is dry in all parts for less than three-fourths of the time (cumulative) when the soil temperature at a depth of 50 cm is 5 oC or higher and a soil moisture regime that borders on xeric. Soil Families and Soil Series in Subgroup GFBO. Other Haplocalcids that meet both of the following:1. Have, in a horizon at least 25 cm thick within 100 cm of the soil surface, an exchangeable sodium percentage of 15 or more (or an SAR of 13 or more) during at least 1 month in normal years; and 2. Are dry in all parts of the moisture control section for less than three-fourths of the time (cumulative) when the soil temperature at a depth of 50 cm is 5 oC or higher and have a soil moisture regime that borders on ustic. Soil Families and Soil Series in Subgroup GFBP. Other Haplocalcids that have, in a horizon at least 25 cm thick within 100 cm of the mineral soil surface, an exchangeable sodium percentage of 15 or more (or an SAR of 13 or more) during at least 1 month in normal years. Sodic HaplocalcidsSoil Families and Soil Series in Subgroup GFBQ. Other Haplocalcids that have both:1. A moisture control section that is dry in all parts for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and a soil moisture regime that borders on xeric; and 2. Throughout one or more horizons with a total thickness of 18 cm or more within 75 cm of the 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, of which 5 percent or more is volcanic glass, and [(Al plus 1/2 Fe, percent extracted by ammonium oxalate) times 60] plus the volcanic glass (percent) is 30 or more. Soil Families and Soil Series in Subgroup GFBR. Other Haplocalcids that have, throughout one or more horizons with a total thickness of 18 cm or more within 75 cm of the 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, of which 5 percent or more is volcanic glass, and [(Al plus 1/2 Fe, percent extracted by ammonium oxalate) times 60] plus the volcanic glass (percent) is 30 or more. Soil Families and Soil Series in Subgroup GFBS. Other Haplocalcids that are dry in all parts of the moisture control section for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and have a soil moisture regime that borders on xeric. Xeric HaplocalcidsSoil Families and Soil Series in Subgroup GFBT. Other Haplocalcids that are dry in all parts of the moisture control section for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and have a soil moisture regime that borders on ustic. Ustic HaplocalcidsSoil Families and Soil Series in Subgroup GFBU. Other Haplocalcids. Typic HaplocalcidsSoil Families and Soil Series in Subgroup pages by sootin claimon : sootinc@gmail.com |