Transpiration coefficient and ratio of transpiration to evapotranspiration of pear tree (Pyrus communis L.) under alternative partial root-zone drying conditions

Shaozhong Kang*, Xiaotao Hu, Taisheng Du, Jianhua ZHANG, Peter Jerie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Transpiration coefficient Kcb, crop coefficient Kc, and the ratio of transpiration to evapotranspiration (T/ET) are important parameters for pear orchard irrigation management and may vary with different methods of irrigation. This study investigated their changes under three irrigation methods: conventional flood irrigation (CFI), fixed partial root-zone drying and irrigation (FPRD) and alternative partial root-zone drying and irrigation (APRD), in a semi-arid region of Victoria, Australia. The average seasonal ET was 865.29, 795.63 and 804.72 mm respectively for CFI, FPRD, and APRD with ET0 of 817.59 mm for the pear fruiting season. The seasonal transpiration accounted for 81.1%, 84.4%, and 84.1% of evapotranspiration for CFI, FPRD, and APRD respectively. For the CFI, FPRD, and APRD treatments, the seasonal average Kc were 1.058, 0.973, and 0.984 (with their maximum values of 1.326, 1.211, and 1.257) respectively similarly, the respective seasonal average Kcb were 0.858, 0.822, and 0.828 (with maximum values of 1.059, 1.024, and 1.054). The relationships between Kcb, Kc, T/ET, and days after the season beginning were fitted to a fifth-order polynomial equation with higher coefficients of determination R2. The maximum Kc and Kcb occured in mid-January. The ratio T/ET varied from 0.736 to 0.909, 0.743 to 0.947, and 0.741 to 0.925 in the pear fruiting season for CFI, FPRD, and APRD treatments respectively. Results suggested that APRD and FPRD can improve the ratio of transpiration to evapotranspiration, and reduce transpiration coefficient and crop coefficient. Such effects should help improve of water-use efficiency in pear orchards.

Original languageEnglish
Pages (from-to)1165-1176
Number of pages12
JournalHydrological Processes
Volume17
Issue number6
DOIs
Publication statusPublished - 30 Apr 2003

Scopus Subject Areas

  • Water Science and Technology

User-Defined Keywords

  • Crop coefficient
  • Pear tree (Pyrus communis L.)
  • Ratio of transpiration to evapotranspiration
  • Sap flow
  • Soil water balance
  • Transpiration coefficient

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