Acid detergent-soluble organic nitrogen contents in various soil organic amendments: Trends of amendment types and relationships with C/N ratios

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  • 各種有機質資材における酸性デタージェント可溶有機態窒素含量 —資材ごとの特徴およびC/N比との関係—
  • 各種有機質資材における酸性デタージェント可溶有機態窒素含量 : 資材ごとの特徴およびC/N比との関係
  • カクシュ ユウキシツ シザイ ニ オケル サンセイ デタージェント カヨウ ユウキタイ チッソ ガンリョウ : シザイ ゴト ノ トクチョウ オヨビ C/Nヒ ト ノ カンケイ

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Abstract

<p>Qualities of soil organic amendments are important determinants of degradability and mineralization in soils. Recently, acid detergent analyses, which are commonly used to assess forage quality, were applied to soil organic amendments, such as composted animal manure, as an index of degradability or mineralization in soil. Concentrations of acid detergent-soluble organic nitrogen (ADSON), which is present in organic materials, were significantly and positively correlated with the quantities of inorganic nitrogen released from amended soils. In this study, we collected samples of various soil organic amendments (n=483), including composted animal manures, green manures, crop residues, and commercially available soil organic amendments (e.g., rapeseed oil cake) that are used in actual cropping systems. In subsequent assessments, ADSON contents were high in rapeseed oil cake and fish meal, and were low in some composted animal manures, some graminaceous green manure crops, leaves and stems of grain crops such as buckwheat and soybean, stubble from forage crops such as sorghum, and in rice husks. Some amendments had low ADSON contents despite the presence of low C/N ratios. Amendments with low C/N ratios typically showed high mineralization rates, likely corresponding with high ADSON contents. Relationships between ADSON contents and C/N ratios, however, were not clear in composted animal manures, but were expressed as a curve in green manure crops. For composted swine manure, ADSON contents increased with increasing ratios of animal excrement to submaterial (mainly sawdust). No other relationships were observed between ADSON contents and the duration of composting, mixing ratios of animal excrement to submaterials, or types of composting facility.</p>

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