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Estimating the water use efficiency of spring barley using crop models

Published online by Cambridge University Press:  14 February 2018

E. Pohanková ,
P. Hlavinka ,
M. Orság ,
J. Takáč ,
K. C. Kersebaum ,
A. Gobin  and
M. Trnka
E. Pohanková*
Affiliation:
Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4, 603 00 Brno, Czech Republic Institute of Agriculture Systems and Bioclimatology, Mendel University in Brno, Zemedelska 1, 613 00 Brno, Czech Republic
P. Hlavinka
Affiliation:
Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4, 603 00 Brno, Czech Republic Institute of Agriculture Systems and Bioclimatology, Mendel University in Brno, Zemedelska 1, 613 00 Brno, Czech Republic
M. Orság
Affiliation:
Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4, 603 00 Brno, Czech Republic Institute of Agriculture Systems and Bioclimatology, Mendel University in Brno, Zemedelska 1, 613 00 Brno, Czech Republic
J. Takáč
Affiliation:
Soil Science and Conservation Research Institute, Gagarinova 10, 827 13 Bratislava, Slovak Republic
K. C. Kersebaum
Affiliation:
Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany
A. Gobin
Affiliation:
Flemish Institute for Technological Research (VITO), 2400 Mol, Belgium
M. Trnka
Affiliation:
Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4, 603 00 Brno, Czech Republic Institute of Agriculture Systems and Bioclimatology, Mendel University in Brno, Zemedelska 1, 613 00 Brno, Czech Republic
*
Author for correspondence: E. Pohanková, E-mail: [email protected]
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Abstract

In the current study, simulations by five crop models (WOFOST, CERES-Barley, HERMES, DAISY and AQUACROP) were compared for 7–12 growing seasons of spring barley (Hordeum vulgare) at three sites in the Czech Republic. The aims were to compare how various process-based crop models with different calculation approaches simulate different values of transpiration (Ta) and evapotranspiration (ET) based on the same input data and compare the outputs of these simulations with reference data. From the outputs of each model, the water use efficiency (WUE) from Ta (WUETa) and from actual ET (WUEETa) was calculated for grain yields and above-ground biomass yield. The results of the first part of the study show that the model with the Penman approach for calculating ET simulates lower actual ET (ETa) sums, at an average of 250 mm during the growing season, than other models, which use the Penman–Monteith approach and simulate 330 mm on average during the growing season. In the second part of the current study, WUE reference values in the range 1.9–2.4 kg/m3 were calculated for spring barley and grain yield. Values of WUETa/WUEETa calculated from the outputs of individual models for grain yields and above-ground biomass yields ranged from 2.0/1.0 to 5.9/3.8 kg/m3 with an average value of 3.2/2.0 kg/m3 and from 3.9/2.1 to 10.5/6.8 kg/m3 with an average value of 6.5/4.0 kg/m3, respectively. The results confirm that the average values of all models are nearest to actual values.

Keywords

Crop modelevapotranspirationfield experimentspring barleywater use efficiency
Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 156 , Themed Issue 5: Themed Issue: Assessment and monitoring of crop water use and productivity under present and future climate , July 2018 , pp. 628 - 644
Copyright
Copyright © Cambridge University Press 2018 

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