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

Preview

Text PlantSoil_235_243.pdf - Published Version Available under License Publisher holds Copyright. Download (414kB) | Preview

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.

Interest & Impact

Downloads

221 since deposited on 02 Jun 2016
14 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item