Paddyモデルによる水田散布除草剤の流出特性の評価  [in Japanese] Evaluation of runoff characteristic of rice herbicides from a paddy plot using the paddy model  [in Japanese]

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Abstract

本研究では、農薬挙動予測モデルのうち田面水深の時間的変動を考慮に入れたPaddyモデルを用いて、水田の水管理方法と農薬の物性値の観点から、農薬の水田内の動態特性や環境中への流出特性について検討した。また、Paddyモデルは粒剤タイプの除草剤を対象に構築されたモデルであるが、近年において水稲用除草剤散布にフロアブル剤の使用が増えていることを鑑み、フロアブル剤に対するPaddyモデルの有効性についても合わせて検討した。

The pesticide paddy field model (PADDY-model) was improved by considering the water balance in a paddy plot, and applied to the evaluation of runoff characteristics of rice herbicides from a paddy field. This model focused particularly on granule formulation, and has been developed for predicting pesticide concentration of water and soil in paddy fields. Recently, not only granule formulations but also floable formulations have been widely utilized as herbicides on paddy fields in Japan. From this viewpoint, field experiments and numerical simulations were performed to examine the applicability of PADDY-model to floable formulations. A comparison between the calculated results and the observed data for the pesticide concentrations in paddy water showed that the PADDY-model could approximately reproduce the observed of herbicide concentration, and that this model could be applied to floable formulations. A scenario analyses was conducted to evaluate the impact of physicochemical properties of pesticide, as well as irrigation water management, on the behavior of rice herbicides in paddy fields. As a result, the behavior of pesticide (of which adsorptivity and volatility were low) was attributable to vertical percolation. Furthermore, surface runoff amounts of pesticide under management of spill-over irrigation, deep ponding irrigation, and non-tilled cropping were larger compared with the runoff amount under the normal irrigation regardless of physicochemical properties. In the cases of mamegement for shallow ponding and intermittent irrigations, vertical percolation amounts increased and surface runoff amounts decreased in comparison with those obtained in the case of normal irrigation management.

Journal

  • Science bulletin of the Faculty of Agriculture, Kyushu University

    Science bulletin of the Faculty of Agriculture, Kyushu University 62(2), 19-30, 2007-10

    Kyushu University

Codes

  • NII Article ID (NAID)
    110006407120
  • NII NACSIS-CAT ID (NCID)
    AA11577672
  • Text Lang
    JPN
  • Article Type
    journal article
  • Journal Type
    大学紀要
  • ISSN
    13470159
  • NDL Article ID
    9262345
  • NDL Source Classification
    ZR6(科学技術--農林水産)
  • NDL Call No.
    Z18-300
  • Data Source
    NDL  NII-ELS  IR  JASI 
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