soil horizon

Varying horizontal bands of colour in the soil often identify a specific soil horizon.

"You are totally changing the soil horizons and forever eliminating any potential for future active agricultural use," he said.

This natural biosphere maintains healthy conditions in the upper soil horizons where annual plant roots thrive.

Biologists believe that this layer of ash served as a soil horizon for native and invasive plants to colonize the area.

Generally, plinthite forms in a soil horizon that is saturated with water for some time during the year.

A soil horizon is a layer parallel to the soil surface, whose physical characteristics differ from the layers above and beneath.

The A horizon is the top layer of the soil horizons or 'topsoil'.

These readings are often used to detect buried soil horizons.

Anthrosols can be found worldwide, though they tend to have different soil horizons in different regions.

Core samples are taken by driving a metal core into the earth at the desired depth and soil horizon.