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EDD.Kandiperox

Key to Great Groups 

EDD. Other Perox that have a kandic horizon that has its upper boundary within 150 cm of the mineral soil surface. Kandiperox, p. 668 

EDD. These are the clayey Perox that have a kandic horizon that has its upper boundary within 150 cm of the mineral soil surface. They do not have a sombric horizon within 150 cm of the mineral soil surface, but they have, in all subhorizons of a kandic horizon within 150 cm of the mineral soil surface, an apparent ECEC of 1.50 or more cmol(+) per kg clay or a pH value (1N KCl) of less than 5.0. They also have a base saturation (by NH4OAc) of less than 35 percent in some horizon within 125 cm of the mineral soil surface. The subsoil has granular structure, and the epipedons may be either dark or light colored. 

Definition 

Kandiperox are the Perox that:

1. Have the upper boundary of a kandic horizon within 150 cm of the mineral soil surface;

2. Have 35 percent or less base saturation (by NH4OAc) in some or all parts within 125 cm of the mineral soil surface;

3. Do not have a sombric horizon within 150 cm of the mineral soil surface; and

4. Do not have an apparent ECEC of less than 1.50 cmol(+) per kg clay and a pH value (1N KCl) of 5.0 or more in some part of a kandic horizon within 150 cm of the mineral soil surface. 

Key to Subgroups 

EDDA. Kandiperox that have, within 125 cm of the mineral soil surface, both:

1. A petroferric contact; and

2. Redox depletions with a color value, moist, of 4 or more and chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage). Aquic Petroferric Kandiperox 

EDDB. Other Kandiperox that have a petroferric contact within 125 cm of the mineral soil surface. Petroferric Kandiperox 

EDDC. Other Kandiperox that have, within 125 cm of the mineral soil surface, both:

1. A lithic contact; and

2. Redox depletions with a color value, moist, of 4 or more and chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage). Aquic Lithic Kandiperox 

EDDD. Other Kandiperox that have a lithic contact within 125 cm of the mineral soil surface. Lithic Kandiperox 

EDDE. Other Kandiperox that have, in one or more horizons within 125 cm of the mineral soil surface, both:

1. 5 percent or more (by volume) plinthite; and

2. Redox depletions with a color value, moist, of 4 or more and chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage). Plinthaquic Kandiperox 

EDDF. Other Kandiperox that have 5 percent or more (by volume) plinthite in one or more horizons within 125 cm of the mineral soil surface. Plinthic Kandiperox 

EDDG. Other Kandiperox that have, in one or more horizons within 125 cm of the mineral soil surface, redox depletions with a color value, moist, of 4 or more and chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage). Aquic Kandiperox 

EDDH. Other Kandiperox 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 Kandiperox 

EDDI. Other Kandiperox that have both:

1. 16 kg/m2 or more organic carbon between the mineral soil surface and a depth of 100 cm; and

2. In all horizons at a depth between 25 and 125 cm from the mineral soil surface, more than 50 percent colors that have both of the following:

                a. Hue of 2.5YR or redder; and

                b. A value, moist, of 3 or less. Humic Rhodic Kandiperox 

EDDJ. Other Kandiperox that have both:

1. 16 kg/m2 or more organic carbon between the mineral soil surface and a depth of 100 cm; and

2. 50 percent or more hue of 7.5YR or yellower and a color value, moist, of 6 or more at a depth between 25 and 125 cm from the mineral soil surface. Humic Xanthic Kandiperox 

EDDK. Other Kandiperox that have 16 kg/m2 or more organic carbon between the mineral soil surface and a depth of 100 cm. Humic Kandiperox 

EDDL. Other Kandiperox that have, in all horizons at a depth between 25 and 125 cm from the mineral soil surface, more than 50 percent colors that have both of the following:

1. Hue of 2.5YR or redder; and

2. A value, moist, of 3 or less. Rhodic Kandiperox 

EDDM. Other Kandiperox that have 50 percent or more hue of 7.5YR or yellower and a color value, moist, of 6 or more at a depth between 25 and 125 cm from the mineral soil surface. Xanthic Kandiperox 

EDDN. Other Kandiperox. Typic Kandiperox 

Definition of Typic Kandiperox 

Typic Kandiperox are the Kandiperox that:

1. Have neither a petroferric nor a lithic contact within 125 cm of the mineral soil surface;

2. Do not have, within 125 cm of the mineral soil surface, a horizon that has more than 5 percent plinthite (by volume);

3. Do not have, in any horizon within 125 cm of the mineral soil surface, redox depletions with a color value, moist, of 4 or more and chroma of 2 or less and also aquic conditions;

4. Do not have, throughout a cumulative thickness of 18 cm or more and within a depth of 75 cm, 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-oxalateextractable aluminum plus 1/2 acid-oxalate-extractable iron of more than 1.0 percent;

5. Have less than 16 kg of organic carbon per m2 to a depth of 1 m, exclusive of surface litter; and

6. Have, in some horizon at a depth between 25 and 125 cm from the mineral soil surface, 50 percent or less colors that have both of the following:

                a. Hue of 2.5YR or redder and a color value, moist, of 3 or less; and

                b. Hue of 7.5YR or yellower and a color value, moist, of 6 or more.

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