Methane emission from rice fields at Cuttack, India

Adhya, T. K. ; Bharati, K. ; Mohanty, S. R. ; Ramakrishnan, B. ; Rao, V. R. ; Sethunathan, N. ; Wassmann, R. (2000) Methane emission from rice fields at Cuttack, India Nutrient Cycling in Agroecosystems, 58 (1-3). pp. 95-105. ISSN 1385-1314

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Methane (CH4) emission from rice fields at Cuttack (state of Orissa, eastern India) has been recorded using an automatic measurement system (closed chamber method) from 1995-1998. Experiments were laid out to test the impact of water regime, organic amendment, inorganic amendment and rice cultivars. Organic amendments in conjunction with chemical N (urea) effected higher CH4 flux over that of chemical N alone. Application of Sesbania, Azolla and compost resulted in 132, 65 and 68 kg CH4 ha-1 in the wet season of 1996 when pure urea application resulted in 42 kg CH4 ha-1. Intermittent irrigation reduced emissions by 15% as compared to continuous flooding in the dry season of 1996. In the wet season of 1995, four cultivars were tested under rainfed conditions resulting in a range of emissions from 20 to 44 kg CH4 ha-1. Application of nitrification inhibitor dicyandiamide (DCD) inhibited while Nimin stimulated CH4 flux from flooded rice compared to that of urea N alone. Wide variation in CH4 production and oxidation potentials was observed in rice soils tested. Methane oxidation decreased with soil depth, fertilizer-N and nitrification inhibitors while organic amendment stimulated it. The results indicate that CH4 emission from the representative rainfed ecosystem at the experimental site averaged to 32 kg CH4 ha-1 yr-1.

Item Type:Article
Source:Copyright of this article belongs to Springer.
Keywords:Organic Amendment; Water Management; Cultivar Variation; Nitrification Inhibitors; Production Potential; Soil Type
ID Code:47837
Deposited On:12 Jul 2011 14:26
Last Modified:12 Jul 2011 14:26

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