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Effect of timing of defoliation on wheat (Triticum aestivum) in Central Queensland: 2. N uptake and relative N use efficiency

journal contribution
posted on 06.12.2017, 00:00 by Xia Hong ZhuXia Hong Zhu, David MidmoreDavid Midmore, DF Yule, BJ Radford
Aspects of nitrogen uptake and use efficiencies were studied in trials quantifying the impact of artificial defoliation on wheat yield and protein content. Late defoliation (after ca. 50 days after sowing, especially in later sowings) led to an increase of hay production, a reduction of N as grain, and nearly always an increase in total N removal. The optimum range of N removal in hay by defoliation was 8–12 kg ha-1 leading to a maximum grain N of 75–79 kg ha-1 and a significantly greater total N recovery and use efficiency. This may be due to greater uptake per se, to reduced plant volatilization of N, or to a combination of the two. The ecological consequence of capturing more N in hay before it is possibly volatilized from plants later in the season is an added benefit to defoliation.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

96

Issue

1

Start Page

160

End Page

167

Number of Pages

8

ISSN

0378-4290

Location

Amsterdam, Netherlands

Publisher

Elsevier

Language

en-aus

Peer Reviewed

Yes

Open Access

No

Acceptance Date

24/06/2005

External Author Affiliations

Department of Natural Resources and Mines; Primary Industries Research Centre;

Era Eligible

Yes

Journal

Field Crops Research