Promoting microbial immobilization of soil nitrogen during restoration of abandoned agricultural fields by organic additions |
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| Authors: | Tibor Szili-Kovács Katalin Török Emma L Tilston David W Hopkins |
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| Institution: | (1) Research Institute for Soil Science and Agricultural Chemistry of the Hungarian Academy of Sciences, Herman O. Str. 15, Budapest, 1022, Hungary;(2) Institute of Ecology and Botany of the Hungarian Academy of Sciences, Vácrátót, Hungary;(3) School of Biological and Environmental Sciences, University of Stirling, Stirling, FK9 4LA, Scotland, UK;(4) Present address: Department of Soil Science, University of Reading, Whiteknights, P.O. Box 233, Reading, RG6 6DW, England, UK;(5) Present address: Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, Scotland, UK |
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| Abstract: | Application of organic materials to soils to enhance N immobilization into microbial biomass, thereby reducing inorganic N
concentrations, was studied as a management option to accelerate the reestablishment of the native vegetation on abandoned
arable fields on sandy soils the Kiskunság National Park, Hungary. Sucrose and sawdust were used at three different topographic
sites over 4 years. N availability and extractable inorganic N concentrations were significantly reduced in all sites. Soil
microbial biomass C and microbial biomass N increased significantly following C additions, but the microbial C to microbial
N ratio remained unaffected. It is concluded that the combined application of the rapidly utilized C source (sucrose) promoted
N immobilization, whereas the addition of the slowly utilized C source (sawdust) maintained the elevated microbial biomass
C and microbial biomass N in the field. |
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| Keywords: | Immobilization Soil microbial biomass Sucrose Sawdust Restoration |
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