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Paddy and Water Environment

, Volume 6, Issue 1, pp 73–82 | Cite as

A model driven by crop water use and nitrogen supply for simulating changes in the regional yield of rain-fed lowland rice in Northeast Thailand

  • Toshihiro Hasegawa
  • Shinji Sawano
  • Shinkichi Goto
  • Pisarn Konghakote
  • Anan Polthanee
  • Yasushi Ishigooka
  • Tsuneo Kuwagata
  • Hitoshi Toritani
  • Jun Furuya
Article

Abstract

Climate change will have significant impacts on the rain-fed rice production ecosystem, and particularly on the ecosystem’s hydrology and water resources. Under rain-fed lowland conditions, substantial variations among fields in grain yield are commonly observed, but a method that can account for field-scale yield variability to produce regional-scale yield estimates is lacking, thereby limiting our ability to predict future rice production under changing climate and variable water resources. In this study, we developed a model for estimating regional yields of rain-fed lowland rice in Northeast Thailand, by combining a simple crop model with a crop calendar model. The crop model incorporates the effects of two important resources (water and nitrogen) on crop growth. The biomass accumulation is driven by water use, whereas the nitrogen supply determines canopy development and thereby constrains crop water use. Accounting for the wide range of planting dates and the strong photoperiod-sensitive characteristics of rice varieties through the calendar model is an essential component in determining regional yield estimates. The present model does not account for the effects of mid-season drought or flooding, but was nonetheless able to explain the spatial and temporal yield variations at the province level for the past 25 years. Thus, it can be used as a prototype for simulating regional yields of rain-fed lowland rice.

Keywords

Crop calendar Oryza sativa L. Photoperiod sensitivity Provincial yield Rain-fed lowland 

Notes

Acknowledgments

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

  • Toshihiro Hasegawa
    • 1
  • Shinji Sawano
    • 1
  • Shinkichi Goto
    • 1
  • Pisarn Konghakote
    • 2
  • Anan Polthanee
    • 3
  • Yasushi Ishigooka
    • 1
  • Tsuneo Kuwagata
    • 1
  • Hitoshi Toritani
    • 1
  • Jun Furuya
    • 4
  1. 1.National Institute for Agro-Environmental sciencesTsukubaJapan
  2. 2.Khon Kaen Rice Research CenterKhon KaenThailand
  3. 3.Khon Kaen UniversityKhon KaenThailand
  4. 4.Japan International Research Center for Agricultural SciencesTsukubaJapan

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