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Nitrous oxide emissions from ryegrass pasture fertilised with a range of enhanced efficiency fertilisers. Murroon, Victoria, 2010 [Theme 1: Inhibitors for reducing emissions]

Data Set Citation

Suter H of The University of Melbourne and . Nitrous oxide emissions from ryegrass pasture fertilised with a range of enhanced efficiency fertilisers. Murroon, Victoria, 2010 [Theme 1: Inhibitors for reducing emissions].
Suter.45.24 (http://www.n2o.net.au/knb/metacat/Suter.45.24/html).

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Ecological Metadata Language (EML) File
Data Table
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Data Set Owner(s):
Individual:
Dr. Helen Suter
Organization:
The University of Melbourne
Position:
Research Fellow
Address:
Department of Resource Management and Geography, Melbourne School of Land and Environment,
The University of Melbourne,
Parkville,
VIC 3010
Australia
Phone:
+61 3 8344 0179 (voice)
Phone:
+61 3 8344 5579 (fax)
Email Address:
helencs@unimelb.edu.au
Web Address:
http://www.findanexpert.unimelb.edu.au/researcher/person16560.html
Individual:
Professor Deli Chen
Organization:
The University of Melbourne
Position:
Reader
Address:
Department of Resource Management and Geography, Melbourne School of Land and Environment,
The University of Melbourne,
Parkville,
VIC 3010
Australia
Phone:
+61 3 8344 8148 (voice)
Email Address:
delichen@unimelb.edu.au
Web Address:
http://www.findanexpert.unimelb.edu.au/researcher/person13219.html
Associated Party
Individual:
Ms. Siobhann McCafferty
Organization:
Institute for Future Environments, Queensland University of Technology
Position:
Data Librarian
Address:
2 George Street,
Brisbane,
QLD 4000
Australia
Phone:
+61 7 3138 0457 (voice)
Email Address:
siobhann.mccafferty@qut.edu.au
Role:
Custodian/Steward
Abstract

This package describes a field trial conducted in 2010 (April to December) to investigate the impact of applying different types of fertilisers to ryegrass pasture on emissions of nitrous oxide (N2O). The project was designed to investigate all potential loss pathways from applied fertilisers by measuring gaseous emissions, soil mineral N levels and plant biomass and N uptake. The trial was run adjacent to a trial that measured ammonia (NH3) loss from surface applied urea-based fertilisers, which is described elsewhere. The N2O trial also complemented a more extensive small plot trial that considered rate effects of applying the different fertilisers on pasture biomass production. The trial was a block design small plot trial with 5 replications per treatment. Treatments were applied generally on a monthly basis, with a single rate of N (40 kg N/ha). Gas samples were collected from manual chambers every few days to weekly and analysed for N2O, CO2 and CH4, soil samples were collected to 10 cm depth every fortnight and analysed for urea, Ammonium and nitrate, and pasture biomass quantity(dry matter) and quality( N content) samples were collected every month prior to fertiliser application.

Keywords
  • N2O
  • Nitrous oxide
  • Enhanced efficiency fertiliser
  • Nitrification inhibitors
  • Urease inhibitors
  • Manual chambers
  • Fine particle application
  • Liquid application
  • Pasture biomass production
  • Murroon
  • VIC
anzsrc-for
  • 0502
  • 0799
Geographic Coverage
Geographic Description:
Murroon, Victoria, Australia
Bounding Coordinates:
West:  
143.81  degrees
East:  
143.81  degrees
North:  
-38.43  degrees
South:  
-38.43  degrees
Temporal Coverage
Begin:
2010-04-12
End:
2010-12-23
Taxonomic Coverage
Taxon:
Rank NameRank ValueCommon Names
GenusLolium
  Speciesperenne
Contact(s)
Individual:
Dr. Helen Suter
Organization:
The University of Melbourne
Position:
Research Fellow
Address:
Department of Resource Management and Geography, Melbourne School of Land and Environment,
The University of Melbourne,
Parkville,
VIC 3010
Australia
Phone:
+61 3 8344 0179 (voice)
Phone:
+61 3 8344 5579 (fax)
Email Address:
helencs@unimelb.edu.au
Web Address:
http://www.findanexpert.unimelb.edu.au/researcher/person16560.html
Individual:
Professor Deli Chen
Organization:
The University of Melbourne
Position:
Reader
Address:
Department of Resource Management and Geography, Melbourne School of Land and Environment,
The University of Melbourne,
Parkville,
VIC 3010
Australia
Phone:
+61 3 8344 8148 (voice)
Email Address:
delichen@unimelb.edu.au
Web Address:
http://www.findanexpert.unimelb.edu.au/researcher/person13219.html
Methods Info
Step 1:
Description:
Small Plot Trial Establishment
The trial was established using small plots of 1 m x 2 m in 5 rows with 20 plots per row. Each row contained 1 replicate of each fertiliser treatment (in addition to treatments or different rates used for the rate trial). Each treatment was randomly applied in each row. Treatments applied were 1) granular urea, 2) urea + urease inhibitor (Agrotain), 3) urea + nitrification inhibitor DMPP, 4) urea + nitrification inhibitor DCD, 5) nitrogen applied as a fine particle spray containing Agrotain, 6) urea applied as a liquid (urea ammonium nitrate).A manual gas collection chamber (23 cm diameter, 25 cm height) was established in each treatment plot for N2O collection by insertion to 5 cm depth 2 days prior to commencement of the experiment, and was left in place for the entire trial. Chambers were left open expect when gas collection occurred so that the microsite within the chamber was minimally altered compared to the environment outside.Three soil moisture and temperature probes were established to 80 cm depth across the site to continuously log water and temperature fluctuations in the soil.A weather station was established on-site.
Instrument(s):
  • MiniMAIT Enviroprobes(R) (80 cm depth) and loggers (MiniMAIT Industries)
  • Vaisala Weather Transmitter (WXT510) weather station (Campbell Scientific).
Step 2:
Description:
Gas Collection
Gas samples were collected from the manual chambers on a regular basis, every few days immediately following fertiliser application and then weekly after that.Samples were collected between 10 amd and 2 pm as a means of providing an estimate of average emissions for a day.At each collection time, the chamber lids were placed on the chambers and samples collected from each chamber at time = 0, 30 and 60 minutes. Prior to sample collection air was mixed in the chambers by pumping 5 times with a 50 ml syringe to ensure a mixed sample. Samples collected were 20 ml in volume and were collected in a 12 ml pre-evacuated exetainer.Temperature within the chambers was monitored using a small logger.Additional information on soil moisture and temperature were collected at the time of gas sample collection using a small thermometer and theta probe.Gas samples were analysed for N2O, CH4 and CO2 using GC.
Instrument(s):
  • Gas chromatography - Agilent technologies, 6890 with ECD for N2O, TCD for CO2 and FID for CH4.
  • ML2x theta probes (Delta-T Devices Ltd., Cambridge, UK).
  • Tinytag temperature logger.
Step 3:
Description:
Soil Samples
Soil samples were collected using a 10 cm corer with a composite made from 3 cores collected per plot at each sample time.Soil samples were immediately oven dried (40oC), passed through a 2mm sieve and extracted in the laboratory as soon as possible. Soils for extraction were placed in 250 mL wide-mouth plastic bottle, and shaken for 2 hour with 100 mL of 2 M KCl containing 5 mg/L phenylmercuric acetate solution. Samples were filtered through Whatman No 42 filter papers. The filtrate was collected and kept in a freezer (-20oC) and then defrosted and analysed for urea, NH4+, and NO3-.
Instrument(s):
  • 10 cm corer.
  • SAN++ segmented flow analyser (Skalar Analytical).
Step 4:
Description:
Pasture biomass and quality
Pasture samples were collected on a monthly basis prior to fertilisation using a small rotary lawnmower. Pasture samples were analysed at a commercial laboratory where they were dried at 70oC for 2 hours. Nitrogen content of the biomass was measured as Kjeldahl nitrogen.
Sampling Area And Frequency:

The trial was conducted on a two year old perennial ryegrass pasture (Lolium perenne), commencing on April 12th 2010 and the finsihing on December 23rd, 2010.

Sampling Description:

Treatments were randomly applied to each of the 5 replicate blocks. Gas samples were collected weekly or more frequently. Soil samples were collected fortnightly. Pasture sampels were collected monthly.

Project Info
Title:
Nitrous Oxide Research Program
Personnel:
Individual:
Professor Deli Chen
Organization:
The University of Melbourne
Position:
Reader
Address:
Department of Resource Management and Geography, Melbourne School of Land and Environment,
The University of Melbourne,
Parkville,
VIC 3010
Australia
Phone:
+61 3 8344 8148 (voice)
Email Address:
delichen@unimelb.edu.au
Web Address:
http://www.findanexpert.unimelb.edu.au/researcher/person13219.html
Role:
Principal Investigator
Individual:
Dr. Helen Suter
Organization:
The University of Melbourne
Position:
Research Fellow
Address:
Department of Resource Management and Geography, Melbourne School of Land and Environment,
The University of Melbourne,
Parkville,
VIC 3010
Australia
Phone:
+61 3 8344 0179 (voice)
Phone:
+61 3 8344 5579 (fax)
Email Address:
helencs@unimelb.edu.au
Web Address:
http://www.findanexpert.unimelb.edu.au/researcher/person16560.html
Role:
Principal Investigator
Funding:

DAFF/GRDC

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