Influence of different soil texture on decomposition of plant residues
1999
Tobiasova, E. | Zaujec, A. (Slovak Agricultural Univ. | Nitra (Slovak Republic). Department of Pedology and Geology) | Jurcova, O.
A soil incubation study was conducted to determine the effects of different soil texture on decomposition of added various plant residues. Soil types (Orthic Luvisol, Eutric Regosol, Eutric Gleysol) were representatives of three different texture. Soils were enriched with plant residues - spring wheat (Triticum aestivum) and clover (Trifolium pratense) - in real ratios of crop and root residues. The intensity of mineralization was determined through the changes of total organic carbon content. The highest intensity of mineralization was at spring wheat on all soil types. This results form different chemical composition. In case of potato, soil was enriched with highest values of decomposeable material, because of present higher content of simple saccharides in contrast to spring wheat, which had higher content of lignine like less decomposeable material. Next cause of different decay is in C:N ratio. Differences were determined in decomposition of these residues on different soil types. Strong influence of soil texture there was recorded. Mineralization of organic carbon was rising towards on light soil. In Eutric Gleysol, there was the highest increase of carbon. It means that the intensity of decomposition closely depends on soil texture. The intensity of decomposition was highest at first stages (to 50 days), which resulted in increase in soil respiration and carbon of microbial biomass. Then the intensity of mineralization was falling to 180 days on all soil types
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