Green waste compost reduces nitrous oxide emissions from feedlot manure applied to soil

Dalal, RC, Gibson, I, Allen, DE and Menzies, NW (2010) Green waste compost reduces nitrous oxide emissions from feedlot manure applied to soil. Agriculture, Ecosystems and Environment, 136 3-4: 273-281. doi:10.1016/j.agee.2009.06.010

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Author Dalal, RC
Gibson, I
Allen, DE
Menzies, NW
Title Green waste compost reduces nitrous oxide emissions from feedlot manure applied to soil
Journal name Agriculture, Ecosystems and Environment   Check publisher's open access policy
ISSN 0167-8809
1873-2305
Publication date 2010-03-15
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.agee.2009.06.010
Open Access Status File (Author Post-print)
Volume 136
Issue 3-4
Start page 273
End page 281
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Australia produces in excess of 1 million tonnes of feedlot manure (FLM) annually. Application of FLM to grain cropping and grazing soils could provide a valuable nutrient resource. However, because of high nutrient concentration, especially of N (>2%), FLM has the potential for environmental pollution, for example, N pollution to the water bodies and N2O emission to the atmosphere. Therefore, controlling N supply from FLM is essential for the judicious utilisation of FLM in the field as well as reducing N2O emission to the atmosphere. We utilised the low N concentration green waste compost (GWC, about 3 million tonnes produced annually) as a potential management tool to assess its effectiveness in regulating N release from FLM and controlling the rates of N2O emission from field application when both FLM and GWC were applied together to sorghum (Sorghum bicolor Moench) grown on a Vertisol. We measured N2O emission rates during the sorghum crop and clean fallowing over one-year period in the field. Annual soil N2O emissions were 5.0 kg N2O ha-1 from urea applied at 150 kg N ha-1, 5.1 and 5.5 kg N2O ha-1 from FLM applied at 10 and 20 t ha-1 respectively, 2.2 kg N2O ha-1 from GWC applied at 10 t ha-1, 4.3 kg N2O ha-1 from FLM and GWC applied together at 10 t ha-1 each, and 3.3 kg N2O ha-1 from the unamended soil. Thus, we found that GWC application reduced N2O emissions below those from an unamended soil while annual emission rate from FLM approached that from fertiliser N application (∼0.7% N2O emission factor). A mixture of FLM + GWC applied at 10 t ha-1 each reduced N2O emission factor by 64% (the emission factor was 0.22%), most likely by reducing the amount of mineral N in the soil because soil NH4-N and NO3-N and the rate of N2O emission were significantly correlated in this soil. Since the global warming potential of N2O is 298 times that of CO2, even a small reduction in N2O emission from GWC application has a significant and positive impact on reducing global warming.
© 2009 Elsevier B.V. All rights reserved.
Keyword Nitrous oxide
Green waste compost
Feedlot manure
Vertisol
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Available online 10 July 2009. Journal issue: Estimation of nitrous oxide emission from ecosystems and its mitigation technologies

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 17 Mar 2011, 23:26:37 EST by Professor Neal Menzies on behalf of School of Land, Crop and Food Sciences