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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Mar 2011, 32 (2)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Methane emission from rice fields in relation to

management of irrigation water

 

Author Details

 

Maninder Kaur Khosa

(Corresponding author)

Department of Soils, Punjab Agricultural University, Ludhiana - 141 004, India

e-mail: manupurba@gmail.com

B.S. Sidhu

Department of Soils, Punjab Agricultural University, Ludhiana - 141 004, India

D.K. Benbi

Department of Soils, Punjab Agricultural University, Ludhiana - 141 004, India

 

 

Publication Data

Paper received:

23 October 2009

 

Revised received:

12 March 2010

 

Accepted:

20 April 2010

 

Abstract

A field experiment was conducted for two years to find out best water management practice to mitigate methane emission from the rice-fields. Continuously flooded conditions yielded two major flushes of methane emission and on an average resulted in relatively higher rate of methane emission (2.20 and 1.30 mg m-2hr-1, respectively in 2005 and 2006) during the kharif season. The methane flux was reduced to half (1.02 and 0.47 mg m-2hr-1, respectively in 2005 and 2006) when rice fields were irrigated 2-3 days after infiltration of flood water into the soil. Irrigating the field at 0.15 bar matric potential reduced seasonal methane flux by 60% (0.99 and 0.41 mg m-2hr-1, respectively in 2005 and 2006) as compared to completely flooded conditions, without any decline in grain yield (60 q ha-1).

 

Key words

Methane flux, Water regime, Greenhouse gases, Global warming, Rice fields

 

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