Phosphate status of chernozem-like hydromorphic soils in the northern Tambov Plain |
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Authors: | A S Nikiforova L V Stepantsova S B Safronov V N Krasin |
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Institution: | 1.Department of Soil Physics and Soil Reclamation, Faculty of Soil Science,Moscow State University,Moscow,Russia;2.Michurinsk State Agricultural University,Michurinsk,Russia |
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Abstract: | The phosphate status of chernozem-like soils in the northern forest steppe of the Tambov Lowland depends on soil waterlogging
and hydrological conditions. Due to surface waterlogging and free effluent seep-age in podzolized, chernozem-like soils of
open watershed depressions, the removal of bases and iron decrease the total phosphorus content by 10–15% because of the decrease
in active mineral phosphates. Organic matter acts as a buffer preventing phosphorus from leaching. In podzolized, chernozem-like
and podzolic, gleyic soils of closed watershed depressions, significant amounts of iron phosphates are accumulated in fine
earth and ortsteins due to surface waterlogging and difficult effluent seepage. Under ground waterlogging, calcium phosphates
prevail in the composition of active mineral phosphorus in the gleyed, gleyic, and gley chernozem-like soils of above-floodplain
terraces. |
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