Keywords:  peat soils, drainage, transformation, degradation, properties, productivity, diagnostics, classification

// Мелиорация.— 2015. – № 2(74) – С 84-96

New approach is represented for classification and diagnosis of anthropogenically improved soils of all evolution stages. 35% is considered as threshold of organic matter in the upper peat-mineral horizon to distinguish agro peat soils and organic mineral soils. New criteria for diagnosis are developed using established regularity in the degree of changing of genetic properties in the peat soils of various evolution stages.