Can additional N fertiliser ameliorate the elevated CO2-induced depression in grain and tissue N concentrations of wheat on a high soil N background?
Article
Article Title | Can additional N fertiliser ameliorate the elevated CO2-induced depression in grain and tissue N concentrations of wheat on a high soil N background? |
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ERA Journal ID | 5314 |
Article Category | Article |
Authors | Tausz, M. (Author), Norton, R. M. (Author), Tausz-Posch, S. (Author), Low, M. (Author), Seneweera, S. (Author), O'Leary, G. (Author), Armstrong, R. (Author) and Fitzgerald, G. J. (Author) |
Journal Title | Journal of Agronomy and Crop Science |
Journal Citation | 203 (6), pp. 574-583 |
Number of Pages | 10 |
Year | 2017 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 0931-2250 |
1439-037X | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/jac.12209 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/epdf/10.1111/jac.12209 |
Abstract | Elevated CO2 stimulates crop yields but leads to lower tissue and grain nitrogen concentrations [N], raising concerns about grain quality in cereals. To test whether N fertiliser application above optimum growth requirements can alleviate the decline in tissue [N], wheat was grown in a Free Air CO2 Enrichment facility in a low-rainfall cropping system on high soil N. Crops were grown with and without addition of 50–60 kg N/ha in 12 growing environments created by supplemental irrigation and two sowing dates over 3 years. Elevated CO2 increased yield and biomass (on average by 25%) and decreased biomass [N] (3%–9%) and grain [N] (5%). Nitrogen uptake was greater (20%) in crops grown under elevated CO2. Additional N supply had no effect on yield and biomass, confirming high soil N. Small increases in [N] with N addition were insufficient to offset declines in grain [N] under elevated CO2. Instead, N application increased the [N] in straw and decreased N harvest index. The results suggest that conventional addition of N does not mitigate grain [N] depression under elevated CO2, and lend support to hypotheses that link decreases in crop [N] with biochemical limitations rather than N supply. |
Keywords | climate change, crop nutrition, dryland agriculture, grain protein, nitrogen fertiliser |
ANZSRC Field of Research 2020 | 410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) |
300403. Agronomy | |
300407. Crop and pasture nutrition | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Melbourne |
Agriculture Victoria | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q75yv/can-additional-n-fertiliser-ameliorate-the-elevated-co2-induced-depression-in-grain-and-tissue-n-concentrations-of-wheat-on-a-high-soil-n-background
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