Nitrous oxide emissions from urine patches - experiment 2 part 2. Terang, Victoria, 2011 [Theme 1: Inhibitors for reducing emissions]

A study of the impact of the nitrification inhibitors dicyandiamide (DCD) on nitrous oxide emissions from dairy cows urine deposited on pasture was conducted at Terang in south-western Victoria, Australia from September 2010 to April 2011. Nitrous oxide fluxes were measured on two replicates of four treatment. Treatment were; * Treatment 1 - nil applied, * Treatment 2 - urine @1000 kgN/ha applied to 25% of chamber base 23 Sept 2010, 21 Oct 2010, 10 Nov 2010 and 7 Dec 2010 * Treatment 3 - urine @ 1000 kg N/ha applied to 25% of the chamber base 23 Sept 2010, 21 Oct 2010, 10 Nov 2010 and 7 Dec 2010 with DCD @10 kg a.i./ha applied 23 Sept 2010 * Treatment 4 - urine @ 1000 kg N/ha applied to 25% of the chamber base 23 Sept 2010, 21 Oct 2010, 10 Nov 2010 and 7 Dec 2010 with DCD @ 10 kg a.i./ha applied each time (4) urine was applied. Nitrous oxide flux was measured in TWO replicates of all treatments. Measurement system used automated chambers linked to a Fourier Transform infrared spectometer for gas analysis. Daily flux (g N2O-N/ha/day) was calculated for each chamber. Soil water (surface 0-65 mm) and soil temperature (50mm) was measured continuously in each chamber base. Soil mineral N content of all treatment and replicates was measured (0-100 mm) routinely. Initial site soil physical and chemical status were defined. Standard meteorological information was collected for an on-site weather station.