Journal article
Water use and growth responses of dryland wheat grown under elevated [CO2] are associated with root length in deeper, but not upper soil layer
S Uddin, M Löw, S Parvin, G Fitzgerald, H Bahrami, S Tausz-Posch, R Armstrong, G O'Leary, M Tausz
Field Crops Research | ELSEVIER | Published : 2018
Abstract
This study investigated crop water use of wheat grown in a dryland Mediterranean-type environment under elevated atmospheric CO2 concentrations ([CO2]). Two related cultivars, contrasting in agronomic features (cvs. Scout and Yitpi; Scout has good early vigour and high transpiration efficiency), were grown under ambient [CO2] (a[CO2], ∼400 μmol mol−1) and elevated [CO2] (e[CO2], ∼550 μmol mol−1) in the Australian Grains Free Air CO2 Enrichment (AGFACE) facility for two growing seasons. Each year, an irrigation treatment (rainfed versus irrigated) was imposed within the CO2-treatments. Normalised difference vegetation index (as surrogate for canopy cover) and root length in the upper (0 cm–32..
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Funding Acknowledgements
Research at the Australian Grains Free-Air CO<INF>2</INF> Enrichment (AGFACE) project was jointly run by the University of Melbourne and Agriculture Victoria Research (Department of Economic Development, Jobs, Transport and Resources) with funding from the Grains Research and Development Corporation and the Australian Department of Agriculture and Water Resources. The authors gratefully acknowledge the contributions of the AGFACE field team lead by Russel Argall, Mel Munn and Roger Perris (all Agriculture Victoria) for agronomic management of the experiment and collecting soil water and CropCircle data, Samuel Henty (University of Melbourne) for tracing root images and Mahabubur Mollah (Agriculture Victoria) for operating and maintaining the CO<INF>2</INF> enrichment technology. SU was supported by a Melbourne International Research Scholarship.