Changes of Nitrogen Dynamics in a Soil Amended with an Anaerobic Digestion Effluent by Organic Material Application

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  • SATO Shinjiro
    Department of Environmental Engineering for Symbiosis, Soka University
  • MORITA Shuhei
    Department of Environmental Engineering for Symbiosis, Soka University

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Other Title
  • 有機資材投入によるメタン発酵消化液施用土壌の窒素動態の変化
  • ユウキ シザイ トウニュウ ニ ヨル メタン ハッコウ ショウカエキシヨウ ドジョウ ノ チッソ ドウタイ ノ ヘンカ

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Abstract

Since anaerobic digestion effluents (ADEs) contain abundant amounts of ammonium-nitrogen (NH4-N), their agronomic benefits as a liquid fertilizer are expected. However, soil application of ADEs may cause leaching of nitrate-nitrogen (NO3-N) to groundwater. Therefore, effects of mixing organic materials on N dynamics, particularly N leaching from a soil amended with an ADE were evaluated using columns in this study. The different amendments did not cause significant differences in the cumulative amounts of NH4-N leached. The application of sawdust and pruned branch decreased 16% and 22%, respectively, of the cumulative amounts of NO3-N leached compared with that from the soil amended with ADE. It appeared that the organic materials physically absorbed NO3-N against leaching, and caused increased soil microbial biomass to enhance N immobilization to contribute to reduced NO3-N leaching from soils amended with ADE and organic materials.

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