Effects of Intermittent Irrigation with Different Intervals on Greenhouse Gas Emissions and Rice Yield

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  • 間断灌漑における間断日数の違いが水田からの温室効果ガス放出と水稲収量に及ぼす影響
  • カンダンカンガイ ニ オケル カンダン ニッスウ ノ チガイ ガ スイデン カラ ノ オンシツ コウカ ガス ホウシュツ ト スイトウ シュウリョウ ニ オヨボス エイキョウ

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Effects of intermittent irrigation with different intervals on greenhouse gas emissions and rice yield were investigated in rice paddy fields. Three treatments for water management practices were prepared as: (1) continuous flooding except during the midseason drainage, (2) intermittent irrigation with two-day drainage, and (3) intermittent irrigation with four-day drainage. The longer the drainage period in intermittent irrigation, the less the CH4 was emitted whereas the more the N2O was. Two-day drainage treatment had the smallest cumulative CO2-equivalent fluxes for CH4 and N2O. Decreases in a drainage period resulted in the reduction of the net greenhouse gas emission. Brown rice yields were the highest for the continuous flooding treatment. The yields of two-day and four-day drainage treatments were smaller than that of the continuous flooding treatment by 13% and 18%, respectively. The two-day drainage treatment achieved the smallest net greenhouse gas emission per brown rice yield, thus mitigated the emission of CH4 and N2O with maintaining yield.

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