Effects of High Content of N0_3-N in Irrigation Water and Rice Straw Application on CH_4 Emission from Paddy Fields

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  • 灌漑水中の高濃度の硝酸および稲わらが水田からのメタンの発生に及ぼす影響
  • 潅漑水中の高濃度の硝酸および稲わらが水田からのメタンの発生に及ぼす影響
  • カンガイスイチュウ ノ コウ ノウド ノ ショウサン オヨビ イナワラ ガ

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Effects of NO_3-N in irrigation water and rice straw application on CH_4 emission from paddy fields were examined. 1) Soil Eh during the cultivation period was increased by rice straw application, while it was decreased by irrigation of high content of NO_3-N. 2) In the plot of rice straw the peak of the formation of acetic acid in soil solution was observed at the middle of June and the first part of August, while in the plot of rice straw and NO_3-N it was observed at the middle of June. It is considered that the difference of variation of the formation of acetic acid is due to the accelerated decomposition of organic materials caused by NO_3-N application. 3) CH_4 emission began to increase in parallel with the decrease of soil Eh and concentration of acetic acid in soil. In the presence of NO_3-N CH_4 flux was not proportional to the concentration of acetic that was considered to be the substrate of methane. These results indicate that CH_4 emission is inhibited by the presence of nitrate ion. These results confirmed that seasonal variation of CH_4 flux from paddy fields in closely related to soil Eh and acetic and in soil solution. It also suggests that agricultural practices such as irrigation and organic material application are important to reduce CH_4 emission from paddy fields.

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