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Nitrous oxide emissions from irrigated cotton fields – variations in time and space

2015

Important note

The information contained in this publication is based on knowledge and understanding at the time of writing (July 2017) and may not be accurate, current or complete. The State of New South Wales (including the NSW Department of Industry), the author and the publisher take no responsibility, and will accept no liability, for the accuracy, currency, reliability or correctness of any information included in the document (including material provided by third parties). Readers should make their own inquiries and rely on their own advice when making decisions related to material contained in this publication. The product trade names in this publication are supplied on the understanding that no preference between equivalent products is intended and that the inclusion of a product name does not imply endorsement by the department over any equivalent product from another manufacturer.

Research organisation
Funding sources
Department of Primary Industries NSW
<abbr title='Department of Primary Industries (New South Wales)'>DPI NSW</abbr> <abbr title='Department of Agriculture and Water Resources (Commonweatlh)'>DAWR</abbr>

Trial details

Researcher(s) Annabelle McPherson (NSW DPI)
Graeme Schwenke (NSW DPI)
Year(s) 2015
Contributor Department of Primary Industries NSW
Trial location(s) Gunnedah, NSW
Further information View external link
Nitrous oxide emissions from irrigated cotton fields – variations in time and space locations
Aims

To explore the assumptions used in our regular N2O emissions sampling. These campaigns examined:

  1. the variation in N2O emissions in relation to chamber closure time.
  2. the variation in N2O emissions over a full 24-hour period 
  3. the variation in N2O across a two metre cross section of hills and furrows within a cotton crop.
Key messages
  • Nitrous oxide (N2O) emission into a closed chamber was found to be linear over our standard closure time of 60 minutes in three of the four chambers tested.
  • Beginning N2O sampling at 9:00–9:30 am appeared to underestimate the daily average N2O flux, although there was no significant time effect in the higher emitting treatment. The sampling time was changed for the following season to start at 10:00–10:30 am.
  • The average flux from the four manual chamber locations used in the main experiments (irrigated furrow, non-irrigated furrow, fertilised side of plant bed, non-fertilised side of plant bed) were found to give a good approximation of the N2O flux averaged across 12 chambers covering all possible locations in a two metre cross section of the cotton field.
  • These tests validated the assumptions made in devising the sampling strategy used in subsequent experiments.
     
Lead research organisation Department of Primary Industries NSW
Host research organisation N/A
Trial funding source DPI NSW AOTG14013
Trial funding source DAWR
Related program Determining optimum nitrogen strategies for abatement of emissions for different irrigated cotton systems
Acknowledgments

These experiments were part of the project Determining optimum nitrogen strategies for abatement of emissions for different irrigated cotton systems (AOTG14013; 2013–17), with joint investment by NSW DPI and DAWR, and administered by CRDC. Thanks to Rod Smith for providing the experimental sites and for applying the N fertiliser treatments into the required plots. Thanks to Mandy Holland for assistance in field sampling. All soil and plant N analyses were carried out by Clarence Mercer, NSW DPI at the ISO9001accredited laboratory at Tamworth Agricultural Institute, NSW DPI.
Other trial partners Co-operator: Rod Smith
Download the trial report to view additional trial information

Method

Crop type Other crop: Cotton
Treatment type(s)
  • Management systems : Other
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Gunnedah 2015

Sow date 1 October 2015
Harvest date 8 May 2016
Plot size Not specified
Plot replication Not specified
Other trial notes

This research paper is an extract from the publication Northern grains Research Results 2017, available at
https://www.dpi.nsw.gov.au/__data/assets/pdf_file/0019/802900/NNSWRR2017-web-access-fixedMar2018.pdf
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Gunnedah, NSW Black vertisol
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Gunnedah, NSW Sodosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Gunnedah NSW
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Climate

Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Gunnedah NSW

NOTE: Exact trial site locality unknown - Climate data may not be accurate
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Some data on this site is sourced from the Bureau of Meteorology

SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.

Trial report and links

2015 trial report



Trial last modified: 05-06-2023 15:30pm AEST