[Chemical-mineralogical characteristic of the sod-pale-loam-podzolic soils]
2007
Smeyan, N.I. | Shulgina, S.V.,National Academy of Sciences. Scientific and Practical Center for Arable Farming (Belarus). Institute for Soil Science and Agrochemistry
The argic horizons of the sod-pale-yellow-podzolic soils which are developed on the loess loam are characterized by maximum quantity of the clay-particles, where the hydromica is the prevalence mineral. The content of the hydromica in oozy fraction upwards on a structure decreases with 70 to 48 %. The coefficient of labilization gradually extends to the top horizons with 20-0,30 up to 0,67-0,75. Soils cultivation leads to narrowing of this parameter in arable horizons (up to 0,29), that specifies on increase in content of hydromicas (53-58%). In soil as a whole the maximum of hydromica is illuvial horizons (10-11%), and minimum – in elluvial horizons - 3-4%. Cultivation leads to increase in absolute quantity of hydromicas in arable horizons only in well-cultivated soils. Transformed changes of clay minerals on a profile of sod-pale-yellow-podzolic soils are accompanied by its differentiation on a total chemical compound. Accumulation in illuvial horizons high dispersed secondary minerals (up to 56-60% of hydromicas), and accordingly reduction silica (76,39-77,93%),correlates with accumulation one-and-a-half of aluminium oxides (11,45-13,09 %) and iron (3,63-4,21%), of potassium oxides (2,95-3,08%) and magnesium (0,94-1,07%). The kations K, Al, Fe are connected with its structure. Consequently, maximum clay in the argic horizons are accompanied by the increase in the content of oxides K, Ai, Fe. The combination of these signs promotes textural differentiation of the profile of the sod-paie-loam-podzolic soils. In arable horizons of well cultivated soils the total content of chemical elements comes nearer to their content in illuvial horizons
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