Effect of sigmoidal releasing-type coated urea fertilizer and ridge tillage on nitrogen accumulation and rate of side-wrinkled seeds in soybean cultivated in rotated paddy fields under poor drainage conditions

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  • NAGUMO Yoshifumi
    Niigata Agricultural Research Institute Crop Research Center:Graduate School of Science and Technology, Niigata University
  • SATO Toru
    Niigata Agricultural Research Institute Crop Research Center
  • HATTORI Makoto
    Niigata Agricultural Research Institute Crop Research Center
  • TSUCHIDA Toru
    Niigata Agricultural Research Institute Crop Research Center:Graduate School of Science and Technology, Niigata University
  • HOSOKAWA Hisashi
    National Agricultural Research Center
  • TAKAHASHI Yoshihiko
    Graduate School of Science and Technology, Niigata University:Faculty of Agriculture, Niigata University
  • OHYAMA Takuji
    Graduate School of Science and Technology, Niigata University:Faculty of Agriculture, Niigata University

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Other Title
  • 排水不良転換畑における畝立栽培およびシグモイド型被覆尿素肥料施用によるダイズの窒素集積量増加とちりめんじわ粒発生率軽減効果
  • ハイスイ フリョウ テンカンバタケ ニ オケル ウネダテ サイバイ オヨビ シグモイドガタ ヒフク ニョウソ ヒリョウシヨウ ニ ヨル ダイズ ノ チッソ シュウセキリョウ ゾウカ ト チリメンジワツブ ハッセイリツ ケイゲン コウカ

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Abstract

Recently, in the Hokuriku region, soybean seed coats have begun to develop wrinkles, which markedly decrease the seed quality. In the present study, we analyzed the effects of ridge tillage (RT) and top or basal applications of sigmoidal releasing-type coated urea fertilizer (CUS) on nitrogen accumulation in shoots and the rate of side-wrinkled seeds. Field experiments were conducted in Nagaoka (Niigata Prefecture) in an upland field with poor drainage conditions converted from a rice paddy. In addition to the conventional basal fertilizer application, RT, RT+CUS120 (CUS120: 120-day type; 60kg N ha^<-1>) and RT+CUS60 (CUS60: 60-day type; 60kg N ha^<-1> top dressing at the ridging period) were compared. The seed yield was highest in RT+CUS60 (4230kg ha^<-1>) as compared with RT+CUS120 (4150kg ha^<-1>), RT (3860kg ha^<-1>), and the control (3490kg ha^<-1>). In addition, nitrogen accumulation in shoots at the R7 stage was increased by 22%, 69%, and 92% in RT, RT+CUS60, and RT+CUS120, respectively, as compared with the control. We also investigated the nitrogen accumulation and rate of side-wrinkled seeds at three conventional tillage fields in Nagaoka. RT reduced the rate of side-wrinkled seeds to half the rate observed with conventional tillage. These data indicate that there is a negative correlation between nitrogen accumulation and the rate of side-wrinkled seeds. Our experiment showed that RT and CUS application promoted nitrogen accumulation and nitrogen fixation in a field with poor growth conditions. Thus, the combination of RT and the use of CUS fertilizers should decrease the rate of side-wrinkled seeds in soybean plants grown in rotated paddy fields under poor drainage conditions.

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