施肥・無施肥リンゴ園土壌の無機態窒素の浸透流出挙動  [in Japanese] Inorganic Nitrogen Leaching Characteristics of Apple Orchard on Non-Fertilization and Fertilization Condition  [in Japanese]

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Author(s)

    • 遠藤 明 ENDO Akira
    • 弘前大学農学生命科学部 Faculty of Agriculture and Life Sciences, Hirosaki University
    • 伊藤 大雄 ITO Daiyu
    • 弘前大学農学生命科学部附属生物共生教育研究センター Teaching and Research Center for Bio-coexistence, Faculty of Agriculture and Life Science, Hirosaki University

Abstract

本研究では, 2011~2013年の3年間におけるリンゴ園土壌中の無機態窒素の浸透流出挙動を理解するために数値計算を実施し, 施肥条件および無施肥条件のもとでの土壌中の無機態窒素濃度の時空間的動態を把握した.数値計算では, リンゴ園土壌の透水性・保水性・無機態窒素の吸着特性等の理化学的性質の他, 地力窒素発現挙動やマメ科植物による窒素固定も勘案し解析を行った.その結果, 無施肥条件においては, リンゴ園土壌間隙水中の年平均NO<sub>3</sub>-N濃度が10mg/Lを下回るが, 施肥条件(150kg/(ha・year))においては約20mg/Lになることが明らかになった.また, 地表面~深度100cmの年平均NO<sub>3</sub>-N濃度が10mg/L未満になる減肥量を算定した結果, 12~59kg/(ha・year)の減肥量が必要であることが明らかになった.

The numerical analysis in order to understand the percolation discharge behavior of inorganic nitrogen in apple orchard in the three years of period from 2011 to 2013 was done. The spatiotemporal dynamics of inorganic nitrogen concentration in the soil water under fertilization and non-fertilization condition were revealed. In the numerical analysis, not only physical and chemical properties of apple orchard soil but analyzed taking account also nitrogen mineralization and nitrogen fixation by legumes. As results, in the non-fertilization condition, although annual average NO<sub>3</sub>-N concentration in soil water was below the 10mg/L, whereas approximately 20mg/L in the fertilization condition. In addition, as a result of calculation of reduced fertilizer amount that the annual average NO<sub>3</sub>-N concentration of soil water from 0 to 100cm in depth becomes less than 10mg/L, it was also found that the reduced fertilizer amount is required as ranged from 12 to 59kg/(ha・year).

Journal

  • Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 82(6), 423-431, 2014

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130005117398
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • NDL Article ID
    026011772
  • NDL Call No.
    Z18-365
  • Data Source
    NDL  J-STAGE 
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