Suter H of The University of Melbourne and . Ammonia loss from ryegrass pastures treated with urea based fertilisers. Murroon, Victoria, 2010 [Theme 1: Inhibitors for reducing emissions].
Suter.7.45
(http://www.n2o.net.au/knb/metacat/Suter.7.45/html).
This data package describes a field trial conducted to assess the influence of urea applied with and without a urease inhibitors NBPT, and as a fine particle (FPA) or liquid application (UAN) on loss of the indirect greenhouse gas ammonia (NH3) from a ryegrass pasture (Lolium perenne L) in autumn and spring of 2010. The trial was designed to assess both fertlizer type and seasonal impacts on NH3 loss. Ammonia loss was measured on 50 m diameter circles using a passive ammonia sampling system where NH3 was trapped in centrally located acid traps. Data was collected on NH3 captured, soil mineral and urea N, plant biomass production and nitrogen content as well as local climatic conditions.
The trial was conducted on a two year old perennial ryegrass pasture (Lolium perenne) with two 3 week sampling campaigns, one commencing on April 12th 2010 and the other commencing on September 27th 2010. A single circle of 25 m diameter was used for each treatment and duplicate samplers were used to collect the NH3. Duplicate ammonia traps for each treatment were changed twice daily at commencement of the trial and then less frequently to 21 days.
Ammonia traps were changed twice daily to less frequently until day 21.
DAFF/GRDC
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