public read uid=datalibrarian,o=unaffiliated,dc=ecoinformatics,dc=org all uid=shcherbak,o=unaffiliated,dc=ecoinformatics,dc=org read Dr. Clemens Scheer Institute for Future Environments, Queensland University of Technology Researcher

2 George St Brisbane Queensland 4000 Australia

+61 7 3138 7636 clemens.scheer@qut.edu.au Ms. Siobhann McCafferty Institute for Future Environments, Queensland University of Technology Data Librarian

2 George Street Brisbane QLD 4000 Australia

+61 7 3138 0457 siobhann.mccafferty@qut.edu.au Custodian/Steward Soil N2O fluxes from cotton were monitored over one season with an automated measuring and analysis system allowing for a high temporal resolution. Emissions were measured from different irrigation intesities according to the following experimental set up: 3 different irrigation treatments: Fully-irrigated (I-50%). The crop will be irrigated when 50% of the plant available water capacity (PAWC) is depleted. Deficit-irrigated 1 (I-60%). The crop will be irrigated when 60% of the PAWC is depleted. Deficit-irrigated 3 (I-85%). The crop will be irrigated when 85% of the PAWC is depleted. N2O emissions were measured with the closed chamber method with 3 replicates per treatmet for the period from November 2009 to May 2010 N2O Nitrous oxide Cotton Irrigation intensity Auto Chambers Kingsthorpe QLD 0502 anzsrc-for 2009-11-01 2010-05-31 Kingsthorpe, Queensland 151.81 151.81 -27.48 -27.48 1275285726133

The soil–atmosphere exchange of N2O was measured with a mobile fully automated measuring system. Sampling chambers (50cm x 50cm x 15cm) were fixed on stainless steel frames. The lids of the chambers were opened and closed automatically with pneumatic devices. During the closing period air samples from each chamber were taken alternately and injected towards the analytical devices. Soil-atmosphere exchange measurements were made at 3 subplots for each treatment within the split-plot design. Changes in N2O concentration after chamber closure were measured with a gas chromatograph (Texas Instruments SRI 8610C, Torrance/USA) equipped with a 63Ni electron capture detector (ECD) for N2O analysis.

Gas chromatograph (Texas Instruments SRI 8610C, Torrance/USA) equipped with a 63Ni electron capture detector (ECD). 1275285726133 Principal Investigator GRDC KT_50%_irrigation_cotton_09.csv Kingsthorpe 50% irrigation cotton 2009 season KT_50%_irrigation_cotton_09.csv 5908 1 #x0A column , ecogrid://knb/scheer.4.3 Date Date of measurement DD-MMM-YY Average Flux Average flux from 3 replicates. N2O N gramsPerHectarePerDay real STDV Standard deviation dimensionless real SE Standard error dimensionless real Fertilizer N fertilizer application (Urea Kg-N/ha) kilogram whole Rain/Irrigation Total amount of rain + irrigation millimeter real Rain Total amount of rain millimeter real Irrigation Total amount of irrigation millimeter real 186 KT_60%_irrigation_cotton_09.csv Kingsthorpe 60% irrigation cotton 2009 season KT_60%_irrigation_cotton_09.csv 5930 1 #x0A column , ecogrid://knb/scheer.12.3 Date Date of measurement DD-MMM-YY Average Flux Average flux from 3 replicates. N2O N gramsPerHectarePerDay real STDV Standard deviation dimensionless real SE Standard error dimensionless real Fertilizer N fertilizer application (Urea Kg-N/ha) kilogram whole Rain/Irrigation Total amount of rain + irrigation millimeter real Rain Total amount of rain millimeter real Irrigation Total amount of irrigation millimeter real 186 KT_85%_irrigation_cotton_09.csv Kingsthorpe 85% irrigation cotton 2009 seasons KT_85%_irrigation_cotton_09.csv 5889 1 #x0A column , ecogrid://knb/scheer.13.3 Date Date of measurement DD-MMM-YY Average Flux Average flux from 3 replicates. N2O N gramsPerHectarePerDay real STDV Standard deviation dimensionless real SE Standard error dimensionless real Fertilizer N fertilizer application (Urea Kg-N/ha) kilogram whole Rain/Irrigation Total amount of rain + irrigation millimeter real Rain Total amount of rain millimeter real Irrigation Total amount of irrigation millimeter real 186 N2O mass flux from soils