Analysis of maize canopy development under water stress and incorporation into the ADEL-Maize model
Youhong Song A , Colin Birch A C and Jim Hanan B DA The University of Queensland, School of Land, Crop and Food Sciences, Gatton, Qld 4343, Australia.
B The University of Queensland, Centre for Biological Information Technology, Brisbane, Qld 4072, Australia.
C Present address: The University of Tasmania, Cradle Coast Campus, Burnie, Tas. 7320, Australia.
D Corresponding author. Email: j.hanan@uq.edu.au
This paper originates from a presentation at the 5th International Workshop on Functional–Structural Plant Models, Napier, New Zealand, November 2007.
Functional Plant Biology 35(10) 925-935 https://doi.org/10.1071/FP08055
Submitted: 7 March 2008 Accepted: 29 July 2008 Published: 11 November 2008
Abstract
Substantial progress in modelling crop architecture has been made under optimal watering conditions; however, crop production is often exposed to water stress. In this research, we develop methods for implementing the simulation of maize (Zea mays L.) canopy architectural development under water stress using data from a maize field trial in 2006–07. Data of leaf number, leaf and internode extension were collected using non-destructive and destructive sampling at 2–3 day intervals. Water stress reduced the extension rate of organs and, therefore, their final length, the reduction being greater as severity of water stress increased. The duration of extension of organs in most phytomers was not significantly affected by water stress. Also, the rate of extension during the linear phase responded linearly to fraction of extractable soil water. An existing 3-D architectural model ADEL-Maize was revised using relationships developed in this study to better incorporate effects of water stress on organ extension and production. Simulated canopy production under three water regimes was validated by comparing predicted final leaf and internode length, plant height and leaf area to independent observations. The analysis and simulation showed that maize organ extension and final length under water stress can be adequately represented by simple linear patterns that are easily integrated into models.
Additional keywords: crop architecture, linear extension, Zea mays.
Acknowledgements
The financial support of the University of Queensland for the research and postdoctoral fellowship for the senior author is gratefully acknowledged. We appreciate the Scientific Officers Mr Victor Robertson and Mr Ian Broad for assistance in 2006–07 field experiment and Mr Al Doherty for assistance in use of APSIM-Maize. Anonymous reviewers are also appreciated for their valuable comments.
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