Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions

B. C.T. MacDonald; I. White; O. T. Denmead

Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions

B. C.T. MacDonald^*, I. White, O. T. Denmead

^*Corresponding author for this work

The Australian National University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

NITROUS OXIDE (N₂O) is a powerful greenhouse gas, 298 times more potent than carbon dioxide (CO₂). Coastal lowland acid sulfate soils (ASS) occupy ∼18 000 ha and constitute only about 5% of Australia's sugarcane soils but they could contribute about a quarter of the national N₂O emissions from sugarcane. It has been proposed by a number of authors that the large differences between the N-gas emissions from ASS and non-ASS are due to the fact that, in ASS, nitrate oxidises reduced iron in the soil producing N₂O and other N-gases. In this paper, we report on laboratory studies that investigated the geochemical pathways that cause these gas emissions. The presence of pyrite enhanced gaseous nitrogen (N) and sulfur dioxide (SO₂) emissions and the flux was also dependent on sample moisture content. This chemical denitrification pathway needs to be considered in fertiliser management and other crop nutrient models. Most of the gas evolution reactions are favoured by acid conditions and it is suggested that increasing surface soil pH and controlling water logging may decrease N-gas emissions.

Original language	English
Title of host publication	32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010
Subtitle of host publication	Bundaberg, Australia 11-14 May 2010
Publisher	Australian Society of Sugar Cane Technologists
Pages	293-300
Number of pages	8
ISBN (Electronic)	9781617388279
Publication status	Published - 2010
Event	2010 ASSCT - 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010 - Bundaberg, Australia Duration: 11 May 2010 → 14 May 2010 Conference number: 32

Publication series

Name	32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010

Conference

Conference	2010 ASSCT - 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010
Abbreviated title	2010 ASSCT
Country/Territory	Australia
City	Bundaberg
Period	11/05/10 → 14/05/10

Cite this

MacDonald, B. C. T., White, I., & Denmead, O. T. (2010). Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions. In 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010: Bundaberg, Australia 11-14 May 2010 (pp. 293-300). (32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010). Australian Society of Sugar Cane Technologists.

MacDonald, B. C.T. ; White, I. ; Denmead, O. T. / Interaction of iron and nitrogen cycles : Implications for fertiliser management and greenhouse gas emissions. 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010: Bundaberg, Australia 11-14 May 2010. Australian Society of Sugar Cane Technologists, 2010. pp. 293-300 (32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010).

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title = "Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions",

abstract = "NITROUS OXIDE (N2O) is a powerful greenhouse gas, 298 times more potent than carbon dioxide (CO2). Coastal lowland acid sulfate soils (ASS) occupy ∼18 000 ha and constitute only about 5% of Australia's sugarcane soils but they could contribute about a quarter of the national N2O emissions from sugarcane. It has been proposed by a number of authors that the large differences between the N-gas emissions from ASS and non-ASS are due to the fact that, in ASS, nitrate oxidises reduced iron in the soil producing N2O and other N-gases. In this paper, we report on laboratory studies that investigated the geochemical pathways that cause these gas emissions. The presence of pyrite enhanced gaseous nitrogen (N) and sulfur dioxide (SO2) emissions and the flux was also dependent on sample moisture content. This chemical denitrification pathway needs to be considered in fertiliser management and other crop nutrient models. Most of the gas evolution reactions are favoured by acid conditions and it is suggested that increasing surface soil pH and controlling water logging may decrease N-gas emissions.",

keywords = "Ammonia, Chemo-denitrification, Hydrogen sulfide, Nitrogen oxides, Nitrous oxide, Pyrite, Sulfur dioxide",

author = "MacDonald, {B. C.T.} and I. White and Denmead, {O. T.}",

year = "2010",

language = "English",

series = "32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010",

publisher = "Australian Society of Sugar Cane Technologists",

pages = "293--300",

booktitle = "32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010",

note = "2010 ASSCT - 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, 2010 ASSCT ; Conference date: 11-05-2010 Through 14-05-2010",

}

MacDonald, BCT, White, I & Denmead, OT 2010, Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions. in 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010: Bundaberg, Australia 11-14 May 2010. 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010, Australian Society of Sugar Cane Technologists, pp. 293-300, 2010 ASSCT - 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, Bundaberg, Australia, 11/05/10.

Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions. / MacDonald, B. C.T.; White, I.; Denmead, O. T.
32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010: Bundaberg, Australia 11-14 May 2010. Australian Society of Sugar Cane Technologists, 2010. p. 293-300 (32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Interaction of iron and nitrogen cycles

T2 - 2010 ASSCT - 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010

AU - MacDonald, B. C.T.

AU - White, I.

AU - Denmead, O. T.

N1 - Conference code: 32

PY - 2010

Y1 - 2010

N2 - NITROUS OXIDE (N2O) is a powerful greenhouse gas, 298 times more potent than carbon dioxide (CO2). Coastal lowland acid sulfate soils (ASS) occupy ∼18 000 ha and constitute only about 5% of Australia's sugarcane soils but they could contribute about a quarter of the national N2O emissions from sugarcane. It has been proposed by a number of authors that the large differences between the N-gas emissions from ASS and non-ASS are due to the fact that, in ASS, nitrate oxidises reduced iron in the soil producing N2O and other N-gases. In this paper, we report on laboratory studies that investigated the geochemical pathways that cause these gas emissions. The presence of pyrite enhanced gaseous nitrogen (N) and sulfur dioxide (SO2) emissions and the flux was also dependent on sample moisture content. This chemical denitrification pathway needs to be considered in fertiliser management and other crop nutrient models. Most of the gas evolution reactions are favoured by acid conditions and it is suggested that increasing surface soil pH and controlling water logging may decrease N-gas emissions.

AB - NITROUS OXIDE (N2O) is a powerful greenhouse gas, 298 times more potent than carbon dioxide (CO2). Coastal lowland acid sulfate soils (ASS) occupy ∼18 000 ha and constitute only about 5% of Australia's sugarcane soils but they could contribute about a quarter of the national N2O emissions from sugarcane. It has been proposed by a number of authors that the large differences between the N-gas emissions from ASS and non-ASS are due to the fact that, in ASS, nitrate oxidises reduced iron in the soil producing N2O and other N-gases. In this paper, we report on laboratory studies that investigated the geochemical pathways that cause these gas emissions. The presence of pyrite enhanced gaseous nitrogen (N) and sulfur dioxide (SO2) emissions and the flux was also dependent on sample moisture content. This chemical denitrification pathway needs to be considered in fertiliser management and other crop nutrient models. Most of the gas evolution reactions are favoured by acid conditions and it is suggested that increasing surface soil pH and controlling water logging may decrease N-gas emissions.

KW - Ammonia

KW - Chemo-denitrification

KW - Hydrogen sulfide

KW - Nitrogen oxides

KW - Nitrous oxide

KW - Pyrite

KW - Sulfur dioxide

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M3 - Conference contribution

AN - SCOPUS:84908151464

T3 - 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010

SP - 293

EP - 300

BT - 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010

PB - Australian Society of Sugar Cane Technologists

Y2 - 11 May 2010 through 14 May 2010

ER -

MacDonald BCT, White I, Denmead OT. Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions. In 32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010: Bundaberg, Australia 11-14 May 2010. Australian Society of Sugar Cane Technologists. 2010. p. 293-300. (32nd Annual Conference of the Australian Society of Sugar Cane Technologists 2010, ASSCT 2010).

Interaction of iron and nitrogen cycles: Implications for fertiliser management and greenhouse gas emissions

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