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2019 | 130 | 149-162
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Nitrogen fractions in dehydrated peat soils

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The aim of the study was to determine the nitrogen speciation in organic soils under mulching, made from sedge and peat. For speciation tests, the method based on extraction with neutral reagent and two-stage acid hydrolysis allowing the separation of mineral nitrogen and organic forms: soluble, easily hydrolysable, hardly hydrolyzing and non-hydrolyzing. Characteristic for the degradation of dehydrated peats, the processes of oxygen transformation of organic matter increased the share of the most mobile soluble and easily hydrolysable fractions. The easily soluble and easily hydrolysable fraction was closely correlated with the decomposition processes of the organic matter of the studied soils. It was confirmed that a useful indicator describing the state of transformations of peat soils occurring after their dehydration, may be the ratio of the amount of nitrogen of the easily hydrolysable to the hardly hydrolysable form. The value of this ratio showed a significant linear relationship with soil characteristics characteristically variable in transformation processes of drained peat soils. It grew along with the advancement of decomposition processes of organic matter.
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  • Department of Soil Science and Agricultural Chemistry, Faculty of Natural Sciences, Institute of Agronomy, University of Natural Sciences and Humanities in Siedlce, 14 Prusa Str., 08-110 Siedlce, Poland
  • Department of Soil Science and Agricultural Chemistry, Faculty of Natural Sciences, Institute of Agronomy, University of Natural Sciences and Humanities in Siedlce, 14 Prusa Str., 08-110 Siedlce, Poland
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