Development of cultural practices to use vapor-phase water in soil advance in dry season

• Project/Area Number: 20380142
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Agricultural environmental engineering
• Research Institution: Japan International Research Center for Agricultural Sciences
• Principal Investigator: OZAWA Kiyoshi Japan International Research Center for Agricultural Sciences, 熱帯・島嶼研究拠点・島嶼生産環境プロジェク, トリーダー (40360391)
• Co-Investigator(Kenkyū-buntansha): KUWAGATA Tsuneo 独立行政法人農業環境技術研究所, 大気環境研究領域, 主任研究員 (90195602) ; FUJIMAKI Haruyuki 鳥取大学, 乾燥地研究センター・緑化保全部門, 准教授 (90323253) ; ICHIYANAGI Kimpei 熊本大学, 大学院・自然科学研究科, 准教授 (50371737) ; NOBORIO Kousuke 明治大学, 農学部, 教授 (60311544)
• Co-Investigator(Renkei-kenkyūsha): GOTO Shinkichi 独立行政法人国際農林水産業研究センター, 熱帯・島嶼研究拠点・島嶼生産環境プロジェクト, 主任研究員 (00354043) ; JYO Kensei 独立行政法人海洋研究開発機構, 地球環境フロンティア研究センター, 研究員 (50344304)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000); Fiscal Year 2010: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2009: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000); Fiscal Year 2008: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
• Keywords: 作物 / 水蒸気 / 地温 / 同位体比 / 東北タイ / 土壌水分移動 / 溝底栽培 / 有効利用

Research Abstract

Water table levels under paddy fields after water gone out in the North-east Thailand have daily variation which increases around noon. The aim of this study is to analyze the cause of this variation and develop cultural practices to utilize the variation effectively for crop production. Isotope ratio of soil water (δ18O/δ16O) decreased around 0:00 and 12:00 in 50 cm depth, and increased around 0:00 and 12:00 in 70 cm depth. The result suggests that water in 30-50 cm depth increase due to vapor phase movement around 12:00. To promote roots deeper can support crop to absorb the lift up water. Furrow bottom cultivation and hole bottom cultivation which crops are planted deeper are succeed to excellent yields and growths in Ishigaki and the North-east Thailand. Water in the water tables are independent on other ground water; the infiltrated rainfall in small basins established in the water tables. It means water table water is local resource and limited. Water flux was estimated from soil water, soil temperature and soil characteristics. However, it resulted that vapor phase movement is too small to effect crop growth. We have to analyze a mechanism of water lifting and/or water flux calculation.

Research Products

• [Presentation] 湿潤地域と熱帯地域における、水の安定同位体比を用いた吸水深度の推定の検討 (2011)
  • Author(s): 佐藤透、小沢聖、登尾浩助、桑形恒男、藤巻晴行、一柳錦平、嶋田純
  • Organizer: 日本農業気象学会2011年全国大会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2011-03-18
• [Presentation] 湿潤地域と熱帯地域における、水の安定同位体比を用いた吸水深度の推定の検討 (2011)
  • Author(s): 佐藤透、小沢聖、登尾浩助、桑形恒夫、藤巻晴行、一柳錦平、嶋田純
  • Organizer: 日本農業気象学会2011年全国大会
  • Place of Presentation: 鹿児島大学郡元キャンパス(鹿児島県)
  • Year and Date: 2011-03-18
• [Presentation] 土壌中の水蒸気態水分を利用した作物栽培技術の開発 (2009)
  • Author(s): 小沢聖、桑形恒男、一柳錦平、藤巻晴行、登尾浩助、後藤慎吉
  • Organizer: 農業環境工学関連学会2009年合同大会
  • Place of Presentation: 東京大学駒場キャンパス
  • Year and Date: 2009-09-17
• [Presentation] 地温差による土壌水分移動 (2009)
  • Author(s): 小沢聖、桑形恒男、後藤慎吉、登尾浩助、一柳錦平、藤巻晴行
  • Organizer: 日本農業気象学会2009年全国大会
  • Place of Presentation: 郡山市
  • Year and Date: 2009-03-26
• [Presentation] 地温差による土壌水分移動 (2009)
  • Author(s): 小沢聖, 桑形恒男, 後藤慎吉, 登尾浩助, 一柳錦平, 藤巻晴行
  • Organizer: 日本農業気象学会
  • Place of Presentation: 郡山市
  • Year and Date: 2009-03-26