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Paddy and Water Environment

, Volume 6, Issue 1, pp 153–157 | Cite as

Characteristics of water balance in a rainfed paddy field in Northeast Thailand

  • Shinkichi GotoEmail author
  • Tsuneo Kuwagata
  • Pisarn Konghakote
  • Anan Polthanee
  • Yasushi Ishigooka
  • Hitoshi Toritani
  • Toshihiro Hasegawa
Short Communication

Abstract

Rice productivity in rainfed paddy fields varies with seasonal changes of water availability in which the conditions of flooding are affected by the water balance. Hydrometeorological measurements were performed in a rainfed paddy field in Northeast Thailand from July 2004 to December 2006 to analyze the water balance. As a result of our measurements, climatologically conditions were classified as semi-humid with an annual precipitation of 1,100 mm/year and annual potential evaporation of 1,660 mm/year in both the year. The surface layer of the paddy soil was clayey and the hydraulic conductivity was very low, so groundwater levels remained below the soil surface even under flooded conditions during the rainy season. Seasonal changes in the amount of soil water were very small, comprising only less than 16% of the total precipitation during the rainy season. Consequently, an effective precipitation of less than 180 mm was enough to establish standing water in the rainfed paddy field.

Keywords

Northeast Thailand Soil texture Soil water Standing water Water balance 

Notes

Acknowledgments

We greatly thank Dr. Krirk Pannangpetch for providing supports our measurements and Mr. Suthep Phukaokaew for collecting field data. We also thank Drs. Haruyuki Fujimaki, Yasuhito Shirato, Masaharu Murakami, Michiko Hayano, and Takeshi Tokida for providing useful comments on our research. This study was financially supported by the research project of Ministry of Agriculture Forestry and Fisheries “Assessment of the impact of global-scale change in water cycles on food production and alternative policy scenarios.”

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Shinkichi Goto
    • 1
    Email author
  • Tsuneo Kuwagata
    • 1
  • Pisarn Konghakote
    • 2
  • Anan Polthanee
    • 3
  • Yasushi Ishigooka
    • 1
  • Hitoshi Toritani
    • 1
  • Toshihiro Hasegawa
    • 1
  1. 1.National Institute for Agro-Environmental SciencesTsukubaJapan
  2. 2.Khon Kaen Rice Research CenterKhon KaenThailand
  3. 3.Khon Kaen UniversityKhon KaenThailand

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