Nebraska Soils Field Trip - Virginia Tech

4th IUSS Soil Classification Conference Field Tour Guidebook
Proposed Action 24: Eliminate Plagganthreptic Alorthods.
Proposed Action 25: Eliminate Plagganthreptic Fragiorthods.
Changes to Chapter 15: key to Ultisols.
Proposed Action 26: Delete the subgroup of Anthropic Kandihumults.
Proposed Action 27: Delete the subgroup of Anthropic Kanhaplohumults.
CHANGES THROUGHOUT SOIL TAXONOMY
Proposed Action 28: Add an exclusionary statement to subgroups that contain the terms Fluventic or
____fluventic throughout the Keys to prevent human-transported soils from being classified in those
taxa. These pertain to Irregular Decrease in OC with depth.
Proposed Action 29: Clearly define and propose a consistent set of additional extragrade subgroup
formative elements for use throughout Soil Taxonomy, to be added as soil series are established.
Anthraltic (from Gr. Anthropos, Human and L. alterāre, to change).
Anthraquic (clearly defined anthraquic conditions).
Anthropic Humic (have an anthropic epipedon and meets the color and carbon requirements of the
mollic epipedon throughout).
Anthropic (have an anthropic epipedon).
Anthroportic (from Gr. Anthropos Human and L. portāre to carry) (i.e., the materials described in the
Arents suborder).
Plaggic (have an plaggen epipedon)
Plagghaplic (have 25 cm of material that qualifies for plaggen epipedon but not ther required 50 cm).
Combinations with existing formative elements at the subgroup level are encouraged as needed.
CHAPTER 17: FAMILY AND SERIES DIFFERENTIAE AND NAMES
Proposed Action 30: Add Add Human-altered and human–transported Material Family Class in Chapter
17 to be used for soils with significant mantles of human-altered or human-transported materials. To
be inserted between Particle-size classes and their substitutes and Mineralogy classes in soils that use
one of the set of additional extragrade subgroup formative elements in Proposed Action 29 and others
clearly tied to human-altered or human-transported materials added later. The 17 classes are defined
in order of importance to human health and safety and use and management of the soil, the control
section defined, and the taxa identified where they are to be used.
Proposed Action 31: The manufactured layer contact is added to the list of root-limiting layers for mineral
soils.
Proposed Action 32: The manufactured layer contact is added to the list of root-limiting layers for Histels.
Proposed Action 33: The manufactured layer contact is added to the list of root-limiting layers for
Histosols.
APPENDIX
Proposed Action 34: Add two references.
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