Journal article
Nitrogen demand and the recovery of 15N-labelled fertilizer in wheat grown under elevated carbon dioxide in southern Australia
SK Lam, D Chen, R Norton, R Armstrong
Nutrient Cycling in Agroecosystems | Published : 2012
Abstract
There are few reports on the effects of atmospheric carbon dioxide concentration ([CO 2]) on fertilizer N recovery by crops under open-air conditions. This study was conducted at the Australian Grains Free-Air CO 2 Enrichment (AGFACE) facility in southern Australia to investigate the effects of elevated [CO 2] (550 μmol mol -1) on growth, N uptake and fertilizer 15N recovery by spring wheat (Triticum aestivum L. cv. Yitpi) over a 2-year period. 15N-enriched (10.22 atom%) granular urea was applied to microplots at 50 kg N ha -1 at varying seasonal rainfall and temperature scenarios (simulated by supplementary irrigation and late sowing) for three experimental periods [2008 normal sowing (2008..
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Funding Acknowledgements
This work was supported by the Grains Research and Development Corporation, the Australian Research Council, the Victorian Department of Primary Industries and The University of Melbourne. The authors wish to thank Mr. Peter Howie, Mr. Russel Argall, Mr. Xingyu Hao and Mr. Vincent Chan for field assistance, and Mr. Jianlei Sun, Dr. Brett Kuskopf and Mr. Ron Teo for chemical analyses.