Effects for Effluent Loads and Mass Balance of Paddy Fields with Reduction of Fertilizer and Non-puddled Cultivation

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  • KANEKI Ryoichi
    School of Environmental Science, University of Shiga Prefecture
  • FURUKAWA Masayuki
    School of Environmental Science, University of Shiga Prefecture
  • YAMAGUCHI Jun
    School of Environmental Science, University of Shiga Prefecture
  • IWAMA Kenji
    School of Environmental Science, University of Shiga Prefecture
  • ODANI Hiromichi
    School of Environmental Science, University of Shiga Prefecture
  • SUDO Miki
    School of Environmental Science, University of Shiga Prefecture

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  • 水田の流出負荷および物質収支に及ぼす育苗箱全量施肥・無代かき栽培の影響
  • スイデン ノ リュウシュツ フカ オヨビ ブッシツ シュウシ ニ オヨボス イクビョウバコ ゼンリョウ セヒ ムシロカキ サイバイ ノ エイキョウ

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The effects of reducing fertilizer and non-puddled cultivation on outflow loads from paddy fields, water purification and mass balance were examined for four years. Four experimental plots were set up for comparison. <BR>As a result, the levels of surface effluent loads of the plots with single application of fertilizer in nursery box were reduced 64 % for T-N and 51 % for T-P as compared with the plots that used conventional fertilizer. The reduced level of subsurface effluent loads of the plots were 26 % for D-N and 23 % for D-P. SS, COD, T-N and T-P surface runoff loads from the non-puddled divisions were reduced 71 %, 59 %, 41 %, and 48 % respectively as compared with those of the puddled divisions. For water purification, non-puddled cultivation appeared to be effective in reducing the effluent loads, because there were significant differences in SS, COD, and P. Additionally, interaction between the puddling methods and fertilizing methods showed significant differences in N. Both nitrogen and phosphorous collected from incoming factors such as irrigation, rain and fertilizer were greater than those of outgoing factors such as surface effluent load, subsurface effluent load and hulled rice because of the use of too much fertilizer.

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