Methane emissions from paddy fields in Bali Island, Indonesia

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Abstract
Methane emission rates from plots with and without fertilizer and rice straw application, and growth of two rice varieties (an improved variety, IR74 or IR64, and a local variety, Krueng Aceh) in two Indonesian paddy fields (Inceptisol and Alfisol soils of volcanic ash origin) were measured every week throughout the growth period in the first and the second cropping seasons, 1994. The CH4 emission rates from the fields were similar between the two varieties. The effect of chemical fertilizer on the increase of the emissions was observed only in the Tabanan paddy field for the plots treated with rice straw. Application of rice straw increased the CH4 emission rates. The mean rates of CH4 emission were 1.37-2.13 mg CH4−C m−2 h−1 for the plots without rice straw and 2.14–3.62 mg CH4−C m−2 h−1 for the plots with rice straw application in the Alfisol plots, and 2.32–3.32 mg CH4 -C m-2 h-1 for the plots without rice straw and 4.18–6.35 mg CH4−C m−2 h−1 for the plots with rice straw application in the Inceptisol plots, respectively. Total amounts of CH4 emitted during the growth period were 3.9–6.8 and 2.6–3.3 g CH4−C m−2 for the Alfisol plots and 6.9–10.7 and 4.2–5.8 g CH4−C m−2 for the Inceptisol plots with and without rice straw application, respectively. These findings suggested that CH4 emission from tropical paddy fields with soils of volcanic ash origin is low.

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