Effect of slope on surface drainage in converted rice paddy

Yoshiyuki Shinogi, Yutaka Kanri, Yuichi Hirose, Kaneto Inoue

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)165-170
Number of pages6
JournalPaddy and Water Environment
Volume3
Issue number3
DOIs
Publication statusPublished - Sep 2005
Externally publishedYes

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surface drainage
paddies
Drainage
rice
drainage
Japan
agronomy
Agronomy
Soils
field crops
soil erosion
crop production
engineering
Crops
Erosion
economics
effect
Economics
soil
soil surface

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science

Cite this

Effect of slope on surface drainage in converted rice paddy. / Shinogi, Yoshiyuki; Kanri, Yutaka; Hirose, Yuichi; Inoue, Kaneto.

In: Paddy and Water Environment, Vol. 3, No. 3, 09.2005, p. 165-170.

Research output: Contribution to journalArticle

Shinogi, Yoshiyuki ; Kanri, Yutaka ; Hirose, Yuichi ; Inoue, Kaneto. / Effect of slope on surface drainage in converted rice paddy. In: Paddy and Water Environment. 2005 ; Vol. 3, No. 3. pp. 165-170.
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