Ammonia loss from temperate pasture systems. Wye, South Australia, 2014 Autumn
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This first field campaign on temperate pasture was conducted at Wye near Mount Gambier in May 2014. The treatments were:
1. Control (Granular urea, 50 kg N/ha, surface applied)
2. Granular urea (50 kg N/ha, surface applied) + urease inhibitor (NBPT, Green ureaNV)
3. Granular urea (50 kg N/ha, surface applied ) + nitrification inhibitor (DMPP, Urea with ENTEC)
The treatment areas (50 m) were located 50 m from all external boundaries and from adjacent treatments. Treatments were hand spread and applied to the 50 m diameter treatment areas in strips to ensure even application. The second trial was undertaken at the same site in October 2014 with the same treatments (see data package lam.64).
Emissions of ammonia and nitrous oxide were measured, using passive samplers and closed static chambers, respectively. Soil mineral N, grass biomass and 15N recovery were also measured.
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