![]() ![]() What's more, Thaler found that this was consistently the case on particular parts of the landscape. ![]() Department of Agriculture has carried out, and found that light brown soil contained so little organic carbon, it really wasn't A-horizon soil at all. Thaler and his colleagues compared that color, as seen from satellites, with direct measurements of soil quality that the U.S. The soil that remains is often much lighter in color. ![]() Plowing, though, released much of the trapped carbon, and topsoil was also lost to wind and water erosion. When settlers first arrived in the Midwest, it was everywhere, created from centuries of accumulated prairie grass. It's full of living microorganisms and decaying plant roots, also called organic carbon. student at the University of Massachusetts, Amherst. Soil scientists call this layer the "A-horizon." It's the "black, organic, rich soil that's really good for growing crops," says Evan Thaler, a Ph.D. The soil that's darkest in color is widely known as topsoil. ![]()
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