| In order to explore the effect of fertilizer regulation under different tillage on CH4 emission from rice fields and relationship with reducing substance in soil, though a field experiment, this paper studied the change of CH4 emission under two kinds of farming methods (conventional tillage and no-tillage) and three kinds of N levels (N0, N1, N2), and two nitrogen application methods (F1, F2) conditions. The results showed that the CH4 emission of each treatment generally appeared bimodal patterned, with a peak in the tillering stage and booting heading stage. CH4 emission accounted for emission in paddy rice in the whole growth period of 75.12% before jointing. No tillage could significantly reduce the CH4 emission from paddy field. Nitrogen fertilization significantly promoted CH4 emission from paddy field. Heavy based fertilizer was beneficial to reduce CH4 emission from no tillage paddy field. Heavy panicle fertilizer was beneficial to reduce CH4 emission from conventional tillage paddy soil. The interaction effect of tillage and nitrogen application methods reached extremely significantl level. The collocation of no tillage and field heavy based fertilizer could remarkably reduce CH4 emission from paddy soil. The effects of tillage and nitrogen fertilizer on CH4 emission from paddy soil were closely related to the total reducing substance, active reduction matter and the content of Fe2+ from paddy soil. Key words: CH4 from paddy fields; tillage pattern; nitrogen fertilizer; reducing substance in soil |
