N budget and NH3 exchange of a grass/clover crop at two levels of N application

Herrmann, B.; Jones, S. K.; Fuhrer, Jürg; Feller, Urs; Neftel, A. (2001). N budget and NH3 exchange of a grass/clover crop at two levels of N application. Plant and Soil, 235(2), pp. 243-252. Springer 10.1023/A:1011961416623

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Atmospheric ammonia (NH3) exchange during a single growing season was measured over two grass/clover fields managed by cutting and treated with different rates of mineral nitrogen (N) fertilizer. The aim was to quantify the total NH3 exchange of the two systems in relation to their N budget, the latter was split into N derived from symbiotic fixation, from fertilization, and from the soil. The experimental site was located in an intensively managed agricultural area on the Swiss plateau. Two adjacent fields with mixtures of perennial ryegrass (Lolium perenne L.), cocks foot (Dactylis glomerata L.), white clover (Trifolium repens L.) and red clover (Trifolium pratense L.) were used. These were treated with either 80 or 160 kg N ha−1 applied as NH4NO3 fertilizer in equal portions after each of four cuts. Continuous NH3 flux measurements were carried out by micrometeorological techniques. To determine the contribution of each species to the overall NH3 canopy compensation point, stomatal NH3 compensation points of the individual plant species were determined on the basis of NH4+ + NH3 (NHx) concentrations and pH in the apoplast. Symbiotic N2 fixation was measured by the 15N dilution method.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant nutrition (discontinued)
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Fuhrer, Jürg and Feller, Urs

Subjects:

500 Science > 580 Plants (Botany)
500 Science > 550 Earth sciences & geology

ISSN:

1573-5036

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

02 Jun 2016 08:13

Last Modified:

02 Jun 2016 08:13

Publisher DOI:

10.1023/A:1011961416623

Uncontrolled Keywords:

Grass/clover mixture, N budget, NH3 exchange, N2 fixation, stomatal NH3compensation point

BORIS DOI:

10.7892/boris.81035

URI:

https://boris.unibe.ch/id/eprint/81035

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