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초록·키워드
Field experiments were conducted to investigate the effect of various cultural practices on methane(CH₄) 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 CH₄ 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 CH₄ emission and highest rice yield at 80% of dosage of nitrogen. No-tillage plot emitted lower CH₄ than tillage plot where the fertilizers were incorporated. On the contrary, no-tillage plot showed a little higher CH₄ 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 by 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 CO₂ to the atmosphere with flooding in no-tillage soil.
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최근 본 자료 전체보기
UCI(KEPA) : I410-ECN-0101-2014-521-000699517
