Which condition is indicative of hydric soils?

Hydric soils are characterized by their saturation by water for a significant portion of the year, which influences their physical and chemical properties. The presence of partial inundation indicates that the soil experiences periods of saturation, making it a defining condition of hydric soils. This saturation leads to the formation of specific soil characteristics, such as low oxygen levels and unique color patterns, both of which are important for identifying hydric soils in wetlands and other water-affected areas.

In contrast, other conditions mentioned do not necessarily indicate hydric soils. High salinity can occur in saline environments, which may or may not be related to the presence of waterlogged conditions. Organic material presence can be found in various soil types, not exclusively in hydric soils, as it depends on the environment and vegetation present. Rocky substrate is more indicative of well-drained areas and is not associated with the saturation characteristic that defines hydric soils. Therefore, partial inundation stands out as a clear indicator of hydric conditions.