SPECIFIC CHARACTERS OF PODZOLIC-YELLOW-GLEYEY SOILS

Abstract

Podzolic – yellow-gleyey soils are more gleyey than the podzolic-yellow soils, they are rich in nutrients,too. As a result of the swamping the physical features of the podzolic-yellow-gleyey soils deteriorated in the areas where the paddy is planted. The podzolic-yellow-gleyey soils spread in the same bioclimate zone as the podzolic-yellow soils. All the same, the podzolic-yellow-gleyey soils exposed to the effect of surface water very much. A level of groundwater isn’t lower than 1m in the autumn,spring of the year, but in summer it isn’t more than 2-2.5 m. The zone was assimilated under the agricultural plants, there was almost no natural vegetation left. The bad ability of water-penetration of gleying horizon was a reason for the surface water to remain on the soil surface for a long time, and it was resulted in development of the gleying process along the AB horizon. A condition was created for development of gleying process under the influence of groundwater in B and BC horizons, too. The absorbing capacity of the podzolic-yellow-gleyey soils is higher. Calcium dominates among the exchangeable bases in these soils. There are three subtypes in the podzolic-yellow-gleyey soils (M.E.Salayev, 1991): podzolic-yellow-gleyey soils, podzolic-yellow-gleying soils, podzolic-yellow-gleying from surface. The moisture condition also plays a role in soil formation. As a result of falling the temperature in the rainy times, it caused decrease of pH value on the upper layer of soil (4-5), but increase of the amount of aluminum and ferrium combinations .