Feb 17, 2023 · There are six different layers or horizons that make up a mature soil profile. These layers or horizons are represented by alphabets O, A, E, C, B, and R. Immature soils lack some of …

Diagnostic horizons are usually indicated with names, e.g. the "cambic horizon" or the "spodic horizon". The WRB lists 40 diagnostic horizons. In addition to these diagnostic horizons, some other soil …

Jan 20, 2026 · The presence of different soil horizons can affect water holding capacity, aeration, soil structure and nutrient availability for plants. In a soil profile, up to five different horizons can be …

There are different types of soil, each with its own set of characteristics. Dig down deep into any soil, and you’ll see that it is made of layers, or horizons (O, A, E, B, C, R).

Most soils have three major horizons -- the surface horizon (A), the subsoil (B), and the substratum (C). Some soils have an organic horizon (O) on the surface, but this horizon can also be buried.

Visit the NRCS Official soil series description page to find a soil series description and the horizons found in that soil. Hint: see if your name or home town/favorite town in the US have their own soil …

Jul 17, 2025 · In this section, we will explore the different types of soil horizons, their characteristics, and their importance in understanding soil structure and function.

Jun 14, 2025 · While the specific characteristics of each horizon vary depending on the location and soil type, there are generally five master horizons, labeled with letters: O, A, E, B, and C. Beneath these …

Sep 20, 2019 · What are the Six Soil Horizons? The six soil horizons are labeled with a letter denotation and are O, A, E, B, C, and R. Each of these soil horizon layers are unique. O is the soil …

All together, these are called a soil profile (figure 1). The simplest soils have three horizons: topsoil (A horizon), subsoil (B horizon), and C horizon. Figure 2. A soil profile is the complete set of soil …