What color indicates somewhat poor internal drainage in soil?

Somewhat poor internal drainage in soil typically manifests as a grayish color. This coloration often indicates the presence of water saturation, which can lead to the formation of iron compounds reacting with the waterlogged conditions and resulting in a pale or grayish hue. Grayish colors signify that the soil is periodically saturated with water but may not be consistently waterlogged, leading to conditions conducive to some drainage.

In contrast, gray with mottles suggests a more fluctuating water table, while all gray with no mottles may indicate more consistent saturation and poorer drainage overall. Brown typically indicates well-drained soil with good aeration and organic matter presence, showcasing nutrient-rich conditions not associated with poor drainage. Thus, the identification of grayish colors helps to indicate the specific drainage conditions and soil formation processes taking place.