Petrographic and mineralogical structure of alluvial meadow dark-coloured soils of delta of the river of Volga

Results of research of petrographic and mineralogical structure of alluvial meadow dark-coloured soils are resulted.Studying soil parts has allowed to here receive the qualitative and quantitative characteristic of clay minerals.Their influence on physical properties is established.At an sara stedy stand aid intensive irrigation of cultivated cultures mobili-sation possibilities of K and other biogene elements from soil decrease.