Which capability subclass indicates undesirable soil structure and low permeability?

Subclass D indicates undesirable soil structure and low permeability. This subclass is associated with soils that do not have good structure and exhibit poor drainage characteristics. Such soils may become compacted easily, leading to reduced aeration and water movement, which can ultimately hinder plant growth and agricultural productivity.

The classification system for soil capability often includes various subclasses that denote specific limitations or desirable features of soils. Subclass D is specifically designed to highlight soils where the physical structure is problematic, contributing to issues like poor water retention and aeration that are critical for crop development.

In contrast, other subclasses address different aspects of soil usability or limitations, distinguishing them from the critical issues represented by Subclass D.