Which layer has the least organic material in soil?
The soil profile, a vertical section of soil, is composed of several distinct layers, each with its own characteristics and functions. Among these layers, the one that typically contains the least organic material is the subsoil. The subsoil is the layer located beneath the topsoil and above the parent material, such as bedrock or clay.
The topsoil, also known as the A horizon, is the layer that accumulates the most organic material. This layer is rich in decomposed organic matter, such as dead plant and animal material, which provides essential nutrients for plant growth. The subsoil, on the other hand, has fewer organic inputs and experiences less decomposition, resulting in lower organic matter content.
In this article, we will explore the factors contributing to the low organic material content in the subsoil and discuss its implications for soil health and plant growth.
