Change of storm-runoff load caused by wheat cropping in paddy fields

DOI Web Site
  • Yoshitaka SUGIMOTO
    Environmental Science Graduate School, Graduate School of the University of Shiga Prefecture
  • Yukio KOMAI
    Department of Environmental Technology, Faculty of Technology, Osaka University of Technology
  • Takao KUNIMATSU
    Emeritus Professor, the University of Shiga Prefecture
  • Osamu NAGAFUCHI
    School of Environmental Science, the University of Shiga Prefecture

Bibliographic Information

Other Title
  • 小麦転作による水稲非作付期間の水田からの洪水流出負荷量の変化
  • コムギテンサク ニ ヨル スイトウ ヒサクツケ キカン ノ スイデン カラ ノ コウズイリュウシュツ フカリョウ ノ ヘンカ

Search this article

Abstract

The storm-runoff loads of nitrogen and phosphorus were observed during seven events in the two experimental small paddy-fields watersheds, the wheat watershed (7.44 ha) and the rice watershed (6.96 ha). The drainage concentrations of total nitrogen (TN) were ranged from 2.70 to 9.86 mg l-1 in the wheat watershed and from 1.56 to 2.18 mg l-1 in the rice watershed. Those of total phosphorus (TP) were ranged from 0.104 to 0.780 mg l-1 and from 0.164 to 0.338 mg l-1, respectively. In the first storm event after the plowing and basal fertilizer, TN and TP concentration of the wheat watershed was the highest in all events. In this event, the TN and TP concentration of the wheat watershed was 5.3 and 2.5 times higher and storm-runoff load was 4.1 and 1.9 times larger than the same event of the rice watershed, respectively. In this event, nitrate nitrogen (NO3-N) and particulate phosphorus (PP) occupied 75% of TN and 47% and TP of the wheat watershed, respectively. As a result, it suggests that the wheat cropping in rice-paddy fields increases the runoff-load of TN and NO3-N.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top