Phase, soil - Components or parts that compose soil material. There are four soil phases, such as solid or mineral phase which consists of soil minerals and soil organic matter; liquid or aqueous phase that contains salts, acids, organo-mineral complexes and other water-soluble subtances; gaseous phase (soil air, soil atmosphere) which contains carbon dioxide (СО2), molecular oxygen (О2), methane (СН4), argon (Ar), hydrogen sulphide (H2S) and other gases; alive phase or the soil biota which consists of plants, micro-organisms and animals.
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