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Nitrous oxide emissions from urine patches - experiment 2 part 2. Terang, Victoria, 2011 [Theme 1: Inhibitors for reducing emissions]
Mr.
Kevin
Kelly
Future Farming Systems Research Division, Victorian Department of Environment and Primary Industries (Victoria)
Project Leader
Private Bag 1
Ferguson Road
Tatura
Victoria
3616
Australia
+61 3 5833 5359
kevin.kelly@depi.vic.gov.au
1332290672437
Content Provider
Ms.
Siobhann
McCafferty
Institute for Future Environments, Queensland University of Technology
Data Librarian
2 George Street
Brisbane
QLD
4001
Australia
+61 7 3138 0457
siobhann.mccafferty@qut.edu.au
Custodian/Steward
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.
Nitrous oxide
N2O
Nitrification inhibitors
Soil mineral nitrogen
Dicyandiamide (DCD)
Bovine urine
Pasture
Terang
Auto Chambers
Dairy Cattle
VIC
0502
0799
anzsrc-for
DemoDAIRY, Terang, Victoria, Australia 38 14 S, 142 55 E
142.92
142.92
-38.24
-38.24
1332290672437
Flux Measurements
Flux was measured using 8 automatic enclosure chambers (0.8m*0.8m*0.47m) with air drawn from each chamber in sequence at a flow rate of approximately 3 L/min and passed through a glass cell mounted in a Fourier Transform Infrared spectrometer (FTIR), all air was recycled to chambers. Instantaneous flux was calculated for one chamber every 30 minute period from an 18 minute closure period. Daily flux (g N2O-N/ha/day) was calculated from 6 measurement periods on each chamber each day as an arithmetic mean. Each chamber had to fixed bases with the chamber moved very week.Daily flux (g N2O-N/ha/day) was calculated from 6 measurement periods on each chamber each day as an arithmetic mean. Each chamber had to fixed bases with the chamber moved very week.
FTIR - standard Bomem FTLA2000 with KBr optics, multipass White cell and InSb detector, 32 m pathlength gas cell (approximate volume 4 L)
Soil water
Surface soil water content (0-65 mm), two probes per chamber base, logged every 30 minutes (averag of 10 minute readings)
Theta-Probes Delta T MK2x
Soil temperature
Soil temperature - logged every 30 minutes (averag of reading every 10 minutes)
Type-T thermocouples
Weather station
Standard measurement weather station
MEA - Australia
May 2011 - October 2011
Experimental design (4 treatments by 6 replicates) * 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.
Weather - soil temperature, soil water, nitrous oxide flux, all chambers (8) Expt 2 part 2
NOTE: Flux measurements until the end of June we conducted using the automated system. Flux measurements for July to October we based on manual samplings, three days a week with missing days interpolated, samples were collected between 10 am and 12 noon (at this site this represents time of day when soil tempature are about daily average), samples were collected from enlcosed sealed chambers at T 0, 10, 20, 30 and 40 minutes after closure. Flux data is based on linear regression as no curvilinearity was evident in the dats sets.
Terang data weather and flux data expt 2 part 2.csv
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Date
DD-MM-YYY
DD-MM-YYYY
Minimum temperature
Daily minimum air temperature - time period 9 am previous daty to 9 am date of record
celsius
natural
Maximum temperature
Daily maximum air temperature (period of measurement 9 am pervious day to 9 am date of record
celsius
natural
Solar radiation (total)
Total radiation (MJ/m^2)
megajoulePersquaremeter
natural
Rainfall
Daily rainfall (mm/day) (time period 9 am previous day to 9 am date of record)
mm/day
natural
ETo (evaporanspiration)
Potential evapotranspiration (mm/day) - calculated from weather station data using FAO 56 methodology
mm/day
natural
Soil temperature (Treat 1, rep 1)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 1, rep 1)
Surface soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 1, rep 1)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil temperature (Treat 1, rep 2)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 1, rep 2)
Surface soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 1, rep 2)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil temperature (Treat 2, rep 1)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 2, rep 1)
Surcafe soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 2, rep 1)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil temperature (Treat 2, rep 2)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 2, rep 2)
Surface soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 2, rep 2)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil temperature (Treat 3, rep 1)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 3, rep 1)
Surface soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 3, rep 1)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil temperature (Treat 3, rep 2)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 3, rep 2)
Surface soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 3, rep 2)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil temperature (Treat 4, rep 1)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 4, rep 1)
Surface soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 4, rep 1)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil temperature (Treat 4, rep 2)
Soil temperature (50 mm)
celsius
natural
Soil water (Treat 4, rep 2)
Surface soil water content (0-60 mm) - volumetric
cubicmillimeterPercubicmillimeter
natural
Nitrous oxide flux (Treat 4, rep 2)
Nitrous oxide flux (g N2O-N/ha/day)
gramsNitrogenperHectareperDay
natural
Soil mineral N content - 4 treatments - Expt 2 part 2
Soil mineral N content (0-100 mm depth), expressed as NH4-N (N in ammonium form), and NO3-N (N in nitrate form)
Terang soil mineral N expt 2.2.csv
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Date
DD-MM-YYYY
DD-MM-YYYY
Treat 1, ammonium-N
Soil ammonium-N (mg NH4-N/kg of soil)
milligramPerkilogramofsoil
natural
Treat 2, ammonium-N
Soil ammonium-N (mg NH4-N/kg of soil)
milligramPerkilogramofsoil
natural
Treat 3, ammonium-N
Soil ammonium-N (,g NH4-N/kg of soil)
milligramPerkilogramofsoil
natural
Treat 4, ammonium-N
Soil ammonium-N (mg NH4-N/kg of soil)
milligramPerkilogramofsoil
natural
l.s.d. (P=0.05) Ammonium-N
least significant differnce at P=0.05
n.s. = not significant
milligramPerkilogramofsoil
natural
Treat 1, nitrate-N
Soil nitrate-N (mg NO3-N/kg of soil)
milligramPerkilogramofsoil
natural
Treat 2, nitrate-N
Soil nitrate-N (mg NO3-N/kg of soil)
milligramPerkilogramofsoil
natural
Treat 3, nitrate-N
Soil nitrate-N (mg NO3-N/kg of soil)
milligramPerkilogramofsoil
natural
Treat 4, nitrate-N
Soil nitrate-N (mg NO3-N/kg of soil)
milligramPerkilogramofsoil
natural
l.s.d. (P=0.05) Nitrate-N
least significant difference at P=0.05
n.s. = not significant
milligramPerkilogramofsoil
natural
megajoulePersquaremeter
mm/day
cubicmm/cubicmm
Soil water content (volumetric)
Nitrous oxide flux g N2O-N/ha/d
mm^3/mm^3
Soil mineral nitrogen