How is mineral soil detected during line work?

• A. By tasting the soil
• B. By color-change tests of soil samples
• C. By digging quickly and relying on instinct
• D. By removing duff and looking for exposed soil with no organic covering; color and texture difference indicate mineral soil

Answer: (D)

In line work, you identify mineral soil by exposing what lies beneath the organic surface and using the visible changes in color and texture as your guide. You do this by removing the duff—the loose organic layer of leaves, needles, and decomposed matter—and looking for exposed soil with little or no organic covering. Mineral soil typically shows a noticeable difference in color and texture from the duff, often being more compact, granular, or differently hued than the organic mat. This hands-on check is practical and reliable in the field, unlike tasting the soil, which isn’t safe or valid; color-change tests of samples would require lab work and aren’t useful for immediate line work; and digging by instinct isn’t a dependable way to determine the mineral layer. So the best approach is to clear away the duff and look for exposed soil, using the color and texture differences to confirm you’ve reached mineral soil.