Sponsor Message The soil that's darkest in color is widely known as topsoil. Soil scientists call this layer the "A-horizon." It's the "black, organic, rich soil that's really good for growing ...

Color Analysis Rapidly Predicts Carbon Content Of Soil Date: March 13, 2007 Source: American Society of Agronomy Summary: Soil color can be used as a simple, inexpensive method to predict ...

I especially liked digging through the layers of soils of varying texture and color. These layers varied from several inches to a few feet in depth and the transition zones between layers were ...