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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.


Nutrient cycling in agroecosystems 58 (2000), Nr.1/3, S.95-105
ISSN: 1385-1314
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert
organic amendment; water management; cultivar variation; nitrification inhibitor; production potential; soil type

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 form the representative rainfed ecosystem at the experimental site averaged to 32 kg Ch4 ha-1 yr-1.