Browse

A horizon of carbonate minerals underlies the organic soils of the Thracian plane. This horizon has irregular thickness, density and mineral composition. In the world scientific literature, such horizons are usually described as pedogenic calcretes. The growth of the carbonate layer depends on many factors; among them are the global climate change, the acidity of the atmospheric precipitates and the agricultural practices. The carbonate layer is very significant to the biological productivity of the soil. It tends...