Effects of burnt and un-burnt rice straw on methane and nitrous oxide emissions in water drainage rice fields
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Publication Details
Author list: Jiaphasuanan T., Towprayoon S.
Publication year: 2014
Journal: RESEARCH JOURNAL OF CHEMISTRY AND ENVIRONMENT (0972-0626)
Volume number: 18
Issue number: 3
Start page: 76
End page: 82
Number of pages: 7
ISSN: 0972-0626
Languages: English-Great Britain (EN-GB)
Abstract
Air pollution problem from rice fields burning has been steadily increasing in Thailand. The rice straw incorporated to the rice field is promoted to avoid air pollution problem. However, this practice is known to enhance CH4 emission from paddy fields. The objective of this study is to quantify greenhouse gas emissions as affected by rice straw incorporation in comparison with rice straw burning under mid-season drainage and local drainage in order to find the compromised conditions. This experiment consisted of burnt (B) and stubble incorporated or un-burnt (S) treatments of rice straw applied with two different water drainage schemes, local and mid-season drainage. It was found that incorporated rice straw increased CH4 emission during the vegetative phase while midseason drainage showed effective reduction during reproductive phase in un-burnt field. Water drainage showed stronger impact on methane reduction in unburnt treatment (50% and 23% in wet and dry season) than burnt treatment (8% and 3% in wet and dry season). The results using net global warming potentials (GWPs) suggest that the combination of unburnt practice and mid-season drainage showed the smallest emission and can reduce air pollution from field burning.
Keywords
Mid-season drainage, Mitigation option, Rice straw management
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