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Measurements of the actual evapotranspiration and crop coefficients of summer and winter seasons crops in Japan

Author

Listed:
  • P. Attarod

    (Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran)

  • M. Aoki

    (Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Japan)

  • V. Bayramzadeh

    (Agriculture Research Center, Islamic Azad University, Karaj Branch, Iran)

Abstract

The main goal was to understand the trends of actual evapotranspiration (AET) and crop coefficient (Kc) in summer and winter seasons crops in Japan, maize, soybean, wheat and Italian rye-grass. Bowen ratio energy balance technique (BREB) was applied to measure the AET and heat flux between ground surface and atmosphere. Measurements were carried out using an automatic weather station (AWS) installed seasonally in the experimental farm of Tokyo University of Agriculture and Technology (TUAT). Penman-Monteith equation recommended by FAO was used to calculate reference crop evapotranspiration (ET0) and Kc was obtained from the ratio of AET to ET0. The results indicated that the average amount of daytime AET in the winter and summer seasons crops were approximately 2.5 and 3.5 mm, respectively monthly daytime. Daytime AET varied between 1.3 and 5.7 mm in winter season crops and between 1.4 and 6.5 mm in summer season crops. No significant differences between daily average values of AET for winter season as well as for summer season crops were found at 5% level of confidence (t = 0.9278, wheat and Italian rye-grass and t = 0.6781, soybean and maize). Average Kc values of summer season crops were found to be slightly higher than those of winter seasons crops. For planning the irrigation scheduling, it is quite necessary to understand the behaviors of AET and Kc during the growing season.

Suggested Citation

  • P. Attarod & M. Aoki & V. Bayramzadeh, 2009. "Measurements of the actual evapotranspiration and crop coefficients of summer and winter seasons crops in Japan," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 55(3), pages 121-127.
    • Handle: RePEc:caa:jnlpse:v:55:y:2009:i:3:id:324-pse
    DOI: 10.17221/324-PSE
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    References listed on IDEAS

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    1. Goyal, R. K., 2004. "Sensitivity of evapotranspiration to global warming: a case study of arid zone of Rajasthan (India)," Agricultural Water Management, Elsevier, vol. 69(1), pages 1-11, September.
    2. Watanabe, Kota & Yamamoto, Takashi & Yamada, Takashi & Sakuratani, Tetsuo & Nawata, Eiji & Noichana, Chairat & Sributta, Akadet & Higuchi, Hirokazu, 2004. "Changes in seasonal evapotranspiration, soil water content, and crop coefficients in sugarcane, cassava, and maize fields in Northeast Thailand," Agricultural Water Management, Elsevier, vol. 67(2), pages 133-143, June.
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