Two different types of trials were conducted across 5 trial sites over two years (2013-2014) I.Multiple sites, single product trials (conducted in years 1 & 2) II.Single site, multiple product trials (conducted in year 2)

At each site, there were four static chambers located in each of the two trial rows (total of 8 chambers per site). Each static chamber was located directly under a dripper. In each case the pressure compensated drippers were suspended above the chambers and tested to ensure irrigation flows were consistent. Chamber placement within each row was equidistant from each tree/vine unless canopy structure or soil conditions differed greatly, in which case chambers were position in the most appropriate location to ensure consistency in results. The chambers were repositioned between years 1 & 2 to standardise the trial between the two years. N2O samples were collected after each application event as per the schedules detailed in tables 1 & 2 below. In year two the sampling was modified to identify N20 emissions prior to trial application and day 3 missed and replaced with day 4 sample to identify how long N20 emissions continued post-application. Whist application timing was scheduled for 10am, there were variations due to logistics and at times application set up issues. When this occurred, sample timing on the subsequent days occurred at the same time as sample timing on the first day of application (day 0). Each chamber was sampled three times at the following intervals – 0 minutes (immediately upon chamber lids being placed onto chambers), 30min and 60min. This would then allow for the development of an emissions slope or emissions per minute once results had been received. All samples were collected in pre-evacuated and pre labelled vials, which were then sent to the Queensland University of Technology (QUT) laboratories for Greenhouse Gas analysis.