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|Title:||Seasonal emissions of methane and nitrous oxide from rice-wheat cropping system during 2002 and 2003|
Gupta, Prabhat K
|Keywords:||Greenhouse gases (GHG);Rice-wheat ecosystem;Water management|
|Abstract:||Methane (CH₄) and nitrous oxide (N₂O) are important atmospheric greenhouse gases (GHGs) and rice-wheat ecosystem has been identified as one of the important anthropogenic sources of GHGs in agriculture sector. The water management in a given rice-wheat ecosystem plays a crucial role in its GHGs emission. It has been observed that the water regime in irrigated rice fields with sandy loam soils becomes intermittently flooded, due to high water percolation, which has a direct bearing on CH₄ emissions. Wheat crop on the other hand does not need water flooding; hence N₂O becomes important due to oxic environment. Intermittently flooded water regimes were simulated at NPL experimental fields to estimate the seasonal emissions of CH₄ and N₂O from rice-wheat cropping system during 2002-2003. The CH₄ and N₂O flux from wheat ecosystem was in the range of – 0.36-1.06 mg m⁻² h⁻¹ and – 0.10-1.22 mg m⁻² h⁻¹, respectively. The CH₄ and N₂O emission from rice cultivation was in the range of – 0.65-1.25 mg m⁻² h⁻¹ and – 0.32-0.43 mg m⁻² h⁻¹, respectively, from irrigated intermittently flooded (IR-IF) multiple aeration (MA) ecosystem. The CH₄ and N₂O seasonal integrated flux (Esif) from wheat cultivation are 1.02 + 0.26 and 0.50 + 0.12 gm⁻², respectively, and from rice cultivation for IR-IF-MA ecosystem 0.52 + 0.36 and 0.28 + 0.20 gm⁻², respectively. The CH₄ emissions were significantly low from IR-IF-MA rice ecosystem and were surprisingly higher comparatively, from the wheat crop. It may be because of frequent rainfall events and high soil temperature in wheat cropping season.|
|Appears in Collections:||IJRSP Vol.36(6) [December 2007]|
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