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It is the O horizon. The A horizon is the mineral horizon and does include a large amount of organic material but the O horizon contains the most abundant amount of organic matter. The O horizon overlies the A horizon.

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C horizon contains organic matter?

The C horizon does not typically contain organic matter, as it is primarily composed of weathered rock material. Instead, organic matter is more commonly found in the upper A horizon of the soil profile.


What soil horizon contains topsoil?

The topsoil is part of the A-horizon in the soil profile. This layer is typically dark in colour and rich in organic matter, making it fertile and ideal for plant growth.


Where in the soil profile organic matter broken down?

the A horizon


Which layer in a soil profile contains the most organic matter?

The O horizon contains the most organic matter. The O horizon overlies the A horizon which is known as the mineral horizon. O - organic A - mineral E - elluviation B - illuviation C - parent material R - bedrock This is the order in which you will see standard soil horizons.


What makes up the top of the soil profile?

The top of the soil profile consists of the O horizon (organic layer) followed by the A horizon (topsoil). The O horizon contains organic matter like leaf litter and decomposing plant material, while the A horizon is rich in minerals, nutrients, and organic material which supports plant growth.


Which horizon of the soil contains the most organic material?

The O horizon, also known as the organic horizon, contains the most organic material. It is made up of decomposing organic matter like leaves, plant debris, and other organic materials.


Where in this soil profile are worms and insects vreaking down organic matter in the soil?

A horizon


What soil horizon is subsoil?

Subsoil is typically found in the B-horizon of the soil profile. It is located below the topsoil layer (A-horizon) and contains less organic matter, more minerals, and is often denser than the surface soil.


What horizon has the most organic matter in soil?

The topsoil horizon (A horizon) typically contains the most organic matter in soil. This is where organic materials such as dead plants, roots, and other organic debris accumulate and decompose, enriching the soil with nutrients.


In a well developed soil profile which horizon is the uppermost layer?

The uppermost layer in a well-developed soil profile is the O horizon, also known as the organic horizon. This layer consists of organic matter such as decaying leaves and plant material. It is typically found at the surface of the soil profile.


In well developed soil profile which horizon is the uppermost layer?

The uppermost layer in a well-developed soil profile is the O horizon, also known as the organic horizon. This layer consists of organic matter such as decomposing plant material and leaf litter. It is typically found at the surface of the soil profile.


Which horizon is the subsoil?

Subsoil is typically found in the B horizon of the soil profile, situated below the topsoil (A horizon) and above the parent material (C horizon). The subsoil contains less organic matter and nutrients compared to the topsoil but often has mineral accumulation and deeper roots.