Part 618 is updated to include minor format changes.
Addition of the soil property “Sum of Bases”.
Addition of eight new Appendices to document NASIS soil property calculations They are: AASHTO Group Index, Cation Exchange Capacity, Effective Cation Exchange Capacity, Extractable Acidity, Liquid Limit and Plasticity Index, Particle Size, Rock Fragments and Percent Passing Sieves, and Water Content (1/10 bar, 1/3 bar, 15 bar, satiated water content, and oven dry bulk density). These NASIS calculations are included to publish the underlying logic in the calculation of these soil properties.
NSSH 622 – Ecological and Interpretive Groups
This section is revised to correct an error in the application of Land Capability Subclasses. Previously, it indicated that subclasses could not be used with soils in Land Capability Class 8. This section is updated to recognize that capability subclass can be used with Land Capability Class 8.
Minor editorial revisions in the text for clarification.
NSSH 629 – Glossary of Landform and Geologic Terms
629.00 – Revisions to Definition and Purpose section.
629.02 – Added some new terms, and revised or edited some existing definitions. (Definitions that are “edited” simply have editorial changes that do not change their meaning).