Subsoil is also much lighter in color and much harder to handle than topsoil. Subsoiling is a slow operation and requires high power input: 60 to 100 hp to pull a single subsoil point through a hard soil. Like topsoil, it is composed of a variable mixture of small particles such as sand, silt and clay, but with a much lower percentage of organic matter and humus. Subsoil - Subsoil is considered the "B" horizon. Although subsoil is much less fertile than topsoil, it can be amended to increase its plant-growing capacities. Parent material - The parent material layer is considered the "C" horizon. A HORIZON- This is the layer that we call "topsoil" and it is located just below the O Horizon. When water drips through the soil from the upper layers (layers above subsoil), it takes along minerals and clay with it like calcium carbonate, iron, and aluminum oxides, etc. Subsoil is the layer of soil under the topsoil on the surface of the ground. Plenty of organic matter will be needed to correct this situation. This layer is called the parent material because the … 3. Subsoil, or the layer directly below topsoil, consists of hard-packed dirt and clay. B HORIZON- This is the layer that we call "subsoil" and it is located just below the A Horizon. Each shank is fitted with a replaceable point or foot, similar to a chisel plough, to break through the impervious layer, shattering the sub-soil to a depth of 45–75 cm (18–30 in). LAYER C (REGOLITH)– This layer is the second last layer of the soil. Get the timing right. It is largely unsuitable for anything organic except for large tree roots. in the subsoil. Well drained soils typically have the brightest color development within the B horizons. This layer is made up of minerals and decomposed organic matter and it is also very dark in color. Topsoil is one of those things that every yard needs, but for some, they never really know what it is made of or how best to use it. B horizons: are commonly referred to as the subsoil. They are a zone of accumulation where rain water percolating through the soil has leached material from above and it has precipitated within the B horizons or the material may have weathered in place. In the latter part of autumn the soil will often become too wet, therefore, the time to subsoil is early autumn, says Mr Wright. Leaching is the cause of the color (or lack thereof). It contains mainly sandy and clay deposits without a lot of organic matter. Subsoil layer. A layer of white between the topsoil and the subsoil usually contains a high percentage of sand. White coloring in the subsoil is typically due to the presence of calcium carbonate. subsoil is a sub part of the soil and is made up of sand, pebbles, and clay This layer is made primarily of clay, iron, and organic matter which accumulated through a process called illuviation. LAYER B (SUBSOIL)– This layer is known as subsoil. Subsoil is the layer of soil below the topsoil. This is the layer that many plants roots grow in. Timing is everything with subsoiling. subsoil is a sub part of the soil and is made up of sand, pebbles, and clay