青森県屏風山砂丘畑におけるナガイモ生育期間中の多灌水処理が土壌中における物質の溶脱・集積に及ぼす影響  [in Japanese] Effects on Anions and Cations Dynamics of the Cropped Soil by Excess Irrigation Treatment during the Growing Period of Chinese Yam in the Byobusan Sand Dune in Aomori Prefecture  [in Japanese]

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Abstract

<p>本研究は, 国営屏風山開拓建設事業により青森県屏風山地域に造成された大規模畑作圃場において, ナガイモの塊茎障害の発生因子を特定することを最終的な目標としている.そこで, 多灌水が土壌中の水溶性イオンの時空間的な動態に及ぼす影響を明らかにするため, ナガイモ作付け圃場に, 対照区と多灌水処理区の各試験区を設置した.深暗渠が敷設された当地域の車力工区のナガイモ作付け圃場における両試験区の深度10, 30, 50, 70, 100および150 cmの土壌間隙水を採取した.そして, ナガイモ生育期間中における各深度の土壌間隙水中の水溶性イオン種成分, pH, ECの各水質項目を測定した.その結果, 降水および灌水パターンに応じた物質の溶脱と集積を受け, 対照区では8月中~下旬の深度10~30 cmにおいて100 mg/L以上のNO<sub>3</sub><sup>-</sup>含量で推移し, 多灌水処理区では8月下旬~9月上旬の深度50 cm付近を中心に100 mg/L以上のNO<sub>3</sub><sup>-</sup>含量にのぼることがわかった.以上のことから, ナガイモ生育期間中の降水および灌水パターンに対応する土壌中に存在する物質の時空間的動態の詳細が明らかになった.</p>

<p>The ultimate goal of the present study was to identify the factors determining the occurrence of tuber damages in Chinese yam in the large-scale agricultural land in the Byobusan-area, Aomori Prefecture developed by the agricultural land development and reclamation project by the government enterprise. To identify effect on anions and cations distribution in soil under excess irrigation, control and test plots were settled. The latter was subjected to excessive irrigation in a Chinese-yam-planting field of the Shariki construction field, where a deep underdrainage system has been installed. Moreover, the tubes with porous cup to collect the soil pore water were installed at depths of 10, 30, 50, 70, 100, and 150 cm in the plots. To understand the anions and cations dynamics of the cropped soil, the concentration of water-soluble ions (e.g., NO<sub>3</sub><sup>-</sup>, SO<sub>4</sub><sup>2-</sup>, Ca<sup>2+</sup>), pH, and electrical conductivity (EC) of the soil pore water at each depth during the growing period of Chinese yam was measured. Consequently, the NO<sub>3</sub><sup>-</sup> content exceeded 100 mg/L at the depth of 10-30 cm in the control plot in mid-August, owing to leaching and accumulation of solutes depending on rainfall and irrigation patterns. However, in the treatment plot subjected to excessive irrigation, the NO<sub>3</sub><sup>-</sup> content exceeded 100 mg/L at a depth of approximately 50 cm from late August to early September. The spatiotemporal dynamics of soil water quality corresponding to precipitation and irrigation patterns during the growth period of the Chinese yam became clear.</p>

Journal

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

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 86(2), I_255-I_263, 2018

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130007520486
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • NDL Article ID
    029475882
  • NDL Call No.
    Z18-365
  • Data Source
    NDL  J-STAGE 
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