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Paper ID: 127

Rice husk biochar application as a mitigation strategy for nitrous oxide and methane emission in sandy paddy soil

G I Wahyuningsih1*, M Shibata2, and S Funakawa2

1Department of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Japan

2 Graduate School of Global Environmental Studies, Kyoto University, Japan


Biochar application and mid-season drainage has become one of approaches to decline agricultural emissions. However, the results are inconsistent due to the trade-off between methane and nitrous oxide gas in paddy soils. This study aims to clarify the effect of rice husk biochar and mid-season drainage combination on GHG emission and crop yield. The research was conducted using pots with three replications to assess the effects of three levels of pyrolytic temperatures (300oC (B300), 450oC (B450), and 600oC (B600)); two levels of doses of rice husk biochar (20 kg/ha (D20) and (200 kg/ha (D200)); and different water management (mid-season drainage (Wd) and flooded condition (Wf)) in sandy paddy soil. The results showed that B600 recorded a higher yield (14 g/pot); D20 resulted in a higher yield (13 g/pot); Wd increased plant growth and resulted in a lower cumulative CH4 and N2O emission (4.3 g CH4 m-2 and -13 mg N2O m-2, respectively). Therefore, we recommend applying a lower dose of 600oC biochar combined with mid-season drainage to decrease GHG emissions while maintaining the crop yield in sandy paddy soil.

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