[Factors and processes of clay increasing in arable horizons of sod-podzolic loamy soils]
Gradusov, B.P.(The V.V.Dokuchaev Soil Inst., Moscow (Russian Federation))
On the basis of the data on minerological, granulometric and microaggregate structure as well as the texture of horizons in forest and tilled sod-podzolic soils confined to cover loams in central stratum of the southern taiga the assumption is stated, that the reason of the increased amount of the clay fraction in horizon Atill is the second peptization of particles of clay minerals. The part of them is inherited from earlier stages of agricultural development, another is the result of the recent intensive cultivation of land. The feature of soils consists inpeptization of clay particles and their stability under conditions of large dozes of mineral and organic fertilizers application
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