畑地への石灰系下水汚泥コンポストの施用が土壌の化学性と有機物の性状に及ぼす影響 Effects of Lime-Treated Sewage Sludge Compost Application on Soil Chemical Properties and Soil Organic Matter

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石灰系下水汚泥コンポストを畑地に施用した場合にも、堆きゅう肥を施用した場合と同様な効果が期待できるのかどうかを検討するため、青森県農業試験場の試験圃場から採取した土壌を用いて、石灰系下水汚泥コンポストの連用に伴う土壌化学性と土壌有機物の変化を調べた。土壌は、下水汚泥コンポストを毎年0、20、40および60Mgha-1施用した区より、連用4年目に作土層から採取した。各土壌について化学性と腐植の分析を行うとともに、水中し別法で耐水性団粒の分離を行い、団粒中の粗粒有機物画分(>53μm)と有機・無機複合体画分(53μmの粗粒有機物画分で顕著であったにもかかわらず、コンポスト施用に伴うマクロ団粒の増加は判然とはしなかった。以上のように、石灰系下水汚泥コンポストの施用は土壌の化学性ならびに土壌有機物の量と質を大きく変化させたが、こうした土壌の変化がマクロ団粒の形成に直接寄与してはいないことが示唆された。

The effects of the application of lime-treated sewage sludge compost on soil chemical properties and soil organic matter (OM) were investigated using soils receiving lime-treated sewage sludge compost for four years at the rates of O, 20, 40 and 60 Mg ha^<-1> year^<-1>. The soils were subjected to chemical analyses and humus characterization, and were separated into four fractions of water-stable aggregates (>1000, 250-1000, 53-250, <53 μm) by slaking of air-dried soil followed by wet sieving. Particulate (>53 μm) and mineralassociated OM (<53 μm) were separated from water-stable aggregates larger than 53 μm by sieving following mechanical dispersion. The application of sewage sludge compost increased significantly the amount of exchangeable Ca^<2+>, and thus resulted in a considerable increase in the soil pH. It also increased signlficantly the amount of soil OM and induced changes in soluble-humus composition. With an increasing rate of compost application, the proportion of the sodium pyrophosphate (NaPP) -soluble fraction increased, while that of the NaOH-soluble fraction decreased. The analysis of humic acid (HA) showed that the application of sewage sludge compost did not affect significantly the humification degree or molecular size distribution of NaPP-soluble HA whereas it induced a significant decrease in the degree of humification and an accumulation of high molecular weight components of NaOH-soluble HA. The OM derived from the applied compost accumulated preferentially in water-stable macroaggregates as particulate OM, but had little effect on the formation of waterstable macroaggregates.

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  • 日本土壌肥料學雜誌 = Journal of the science of soil and manure, Japan

    日本土壌肥料學雜誌 = Journal of the science of soil and manure, Japan 74(6), 749-757, 2003-12-05

    日本土壌肥料學會

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各種コード

  • NII論文ID(NAID)
    110001746767
  • NII書誌ID(NCID)
    AN00195767
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00290610
  • NDL 記事登録ID
    6785730
  • NDL 雑誌分類
    ZR7(科学技術--農林水産--農産)
  • NDL 請求記号
    Z18-331
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  IR 
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