Overgrowing of fallow soddy podzolic soils as a factor of modern pedogenesis

The research shows that overgrowing of agricultural soddy-podzolic soils in the taiga-forest zone leads to differentiation of the arable layer into two sublayers. Sod pedogenesis is superimposed on its upper part, which leads to an increase in its humus content and total exchangeable bases and a decrease in soil fertility. A podzolic process is imposed on its lower part, which causes a reduction in its humus content and an increase in the acidity of the entire postaprogenic layer. After 40 years of overgrowing, these sublayers become close to the horizon AY (soddy horizon) and to the EL (eluvial horizon) of virgin soils in a set of their properties.