Methane emission from plots with differences in fertilizer application in thai paddy fields

Methane emission from an indonesian paddy field subjected to several fertilizer treatments

“…The period of measurement of the CH 4 emission rates was equally divided into halves and the total amount of CH 4 emitted in the first and second halves of rice growing period was calculated. More than 50% of CH 4 was emitted in the first half of the growth period, which was in accordance with the results observed in Thailand irrespective of plots, and in contrast with the results obtained in Japan (Jermsawatdipong et al 1994). This finding reconfirmed the assumption that due to the high temperature from the beginning of rice growth in the tropics (Indonesia) the main decomposition stage of soil and applied organic materials shifted to the early growth stage, which resulted in active CH 4 production from the very beginning of rice growth (Jermsawatdipong et al 1994).…”

“…The emission was estimated at 31-40 g CH 4 m-2 for the chemical fertilizer plots, and 34-47 g CH 4 m-2 for the plots amended with both urea and organic materials, respectively. Thus, the effect of the application of organic materials was not as conspicuous as that observed in Thailand (Jermsawatdipong et al 1994), and Plot I emitted a larger amount of CH 4 than Plots 5 and 6, though in Plots 4, 5, and 6 with additional application of organic materials to urea methane emission increased by 9 to 51 % compared with the respective plot amended with urea alone (Plot 2).…”

“…emission rates from tropical paddy fields are comparatively limited (Denier van der gon et al 1992;Yagi et al 1994;Jermsawatdipong et al 1994), the total amount of CH 4 emitted from the paddy fields in the world has been estimated by using data from paddy fields in the temperate region (Schlitz et al 1990;Mathews et al 1991;Anastasi et al 1992). Therefore direct measurement of CH 4 emission from paddy fields in various tropical countries are urgently needed.…”

Continuous Monitoring of the Methane Concentration in the Atmosphere by IR Spectrometry with a 1.66-μm Diode Laser

“…8 This method has sometimes been criticized, however, because the ecosystem of the sampling area may be changed if it is artificially closed. Akagi et al proposed a new estimation method using data obtained by the present laser system.…”

Effect of rice straw application on CH4emission from paddy fields

“…It is generally recognized that the application of rice straw (RS) increases the emission of CH 4 , which is one of the major greenhouse gases, from paddy fields (Schlitz et al 1989;Yagi and Minami 1990;Sass et al 1991;Kimura et al 1991;Cicerone et al 1992;Chen et al 1993;Inubushi et al 1994;Jermsawatdipong et al 1994;Watanabe et al 1995). Watanabe et al (1993a) reported that CH 4 emission from rice-planted pots with the application of RS which underwent weathering in a paddy field during the off-cropping season was lower than those from the pots with fresh RS.…”