Effect of slope on surface drainage in converted rice paddy

Yoshiyuki Shinogi, Yutaka Kanri, Yuichi Hirose, Kaneto Inoue

研究成果: Contribution to journalArticle査読

抄録

Due to the recent regulation of rice production in Japan, it has become necessary to convert rice paddy to other field crops production. To achieve this, drainage conditions, especially for surface drainage, must be improved. We propose the introduction of a slight slope to improve surface drainage, but the optimal slope must be determined in order to prevent soil erosion caused by excessive slope, as well as increased cost. In Japan, a 0.1% slope has recently come into widespread use and, therefore, the impact on surface drainage must be quantified. In this report, observations were carried out to quantify the impact of a 0.1% slope for converted rice paddy and the following results were obtained: (1) An approximate 0.1% slope enables improvement of 46% of the soil surface saturation area as compared to flat conditions about 10 h after inundation; and (2) Inundated water remains on a flat field, while it moves downward toward the end on a sloped field. These results give a basis for determining a slope on a rice paddy in terms of surface drainage improvement. However, the optimal slope should be decided from various perspectives including engineering, agronomy, and economics etc.

本文言語英語
ページ(範囲)165-170
ページ数6
ジャーナルPaddy and Water Environment
3
3
DOI
出版ステータス出版済み - 9 1 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 環境工学
  • 農業および作物学
  • 水の科学と技術

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