Kandiustox TH
A soil profile of a red, clayey Kandiustox in Thailand. It has an ochric epipedon about 10 cm thick underlain by a kandic horizon that extends beyond the base of the photo. Although this soil has a high content of clay throughout, it has granular structure and so is porous. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Kandiustox have a clayey surface layer and a kandic (very low cation-exchange capacity) subsoil horizon that has its upper boundary within a depth of 150 cm. There is a noticeable increase in clay content from the surface to the subsoil. They have, in all subhorizons of the 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 base saturation (by NH4OAc) of less than 35% in some horizon within a depth of 125 cm. The subsoil has a moderate grade of blocky structure in most pedons. The epipedons are either dark- or light-colored. The subsoil shows evidence of translocated clay only in a few areas. In some pedons, it tends to have a weak or moderate grade of blocky structure. In most of the soils; however, there is a strong secondary structure that is fine granular. Supplemental irrigation is needed for continuous cropping.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
Kandiustox TH
A soil profile of a red, clayey Kandiustox in Thailand. It has an ochric epipedon about 10 cm thick underlain by a kandic horizon that extends beyond the base of the photo. Although this soil has a high content of clay throughout, it has granular structure and so is porous. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Kandiustox have a clayey surface layer and a kandic (very low cation-exchange capacity) subsoil horizon that has its upper boundary within a depth of 150 cm. There is a noticeable increase in clay content from the surface to the subsoil. They have, in all subhorizons of the 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 base saturation (by NH4OAc) of less than 35% in some horizon within a depth of 125 cm. The subsoil has a moderate grade of blocky structure in most pedons. The epipedons are either dark- or light-colored. The subsoil shows evidence of translocated clay only in a few areas. In some pedons, it tends to have a weak or moderate grade of blocky structure. In most of the soils; however, there is a strong secondary structure that is fine granular. Supplemental irrigation is needed for continuous cropping.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...