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Effects of Cultural Practices on Methane Emission in Tillage and No-tillage Practice from Rice Paddy Fields  

Ko, Jee-Yeon (National Yeongnam Agricultural Experiment Station, RDA)
Lee, Jae-Saeng (National Yeongnam Agricultural Experiment Station, RDA)
Kim, Min-Tae (National Yeongnam Agricultural Experiment Station, RDA)
Kang, Hang-Won (National Yeongnam Agricultural Experiment Station, RDA)
Kang, Ui-Gum (National Yeongnam Agricultural Experiment Station, RDA)
Lee, Dong-Chang (National Yeongnam Agricultural Experiment Station, RDA)
Shin, Yong-Gwang (National Institute of Agricultural Science and Technology, RDA)
Kim, Kun-Yeop (National Institute of Agricultural Science and Technology, RDA)
Lee, Kyeong-Bo (National Honam Agricultural Experiment Station, RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.35, no.4, 2002 , pp. 216-222 More about this Journal
Abstract
Field experiments were conducted to investigate the effect of various cultural practices on methane($CH_4$) emission in tillage and no-tillage practice in a clayey paddy soil from 1998 to 2000. The factors evaluated in tillage and no-tillage methods were types of nitrogen fertilizers, application method of chemical fertilizers, rice straw application and cultivation method. Of the nitrogen fertilizers, the amount of $CH_4$ emission in ammonium sulfate plot was the lowest, regardless of tillage and the application method. 26.4~41.1% of reduction by ammonium sulfate compared with urea. But in no-tillage which have problem of poor rice yield than tillage, coated urea was more effective nitrogen fertilizer because that showed similar $CH_4$ emission and highest rice yield at 80% of dosage of nitrogen. No-tillage plot emitted lower $CH_4$ than tillage plot where the fertilizers were incorporated. On the contrary, no-tillage plot showed a little higher $CH_4$ emission compared with tillage plot for the surface application. When rice straw was applied, no-tillage practice reduced methane emission by 26.6% compared with tillage practice, but showing a little difference of 10.7% in no application. With cultivation method, no-tillage practice reduced methane emission 26.6% compared with tillage for the 30-d-old seedling transplanting. But for the dry direct seeding practice, no-tillage was a less effective because considerable amounts of rice straw incorporated by tillage were more decomposed aerobically in the soil and emitted as $CO_2$ to the atmosphere with flooding in no-tillage soil.
Keywords
No-tillage; Methane emission; Paddy fields; cultural practices;
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