Effect of water management on greenhouse gas emissions and microbial properties of paddy soils in Japan and Indonesia |
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| Authors: | A Hadi K Inubushi K Yagi |
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| Institution: | 1.Jurusan Tanah, Fakultas Pertanian,Univeristas Lambung Mangkurat,Banjarbaru,Indonesia;2.Laboratory of Soil Science,Chiba University,Matsudo,Japan;3.National Institute for Agro-Environmental Sciences,Tsukuba,Japan |
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| Abstract: | This research aims at elucidating the greenhouse gas emissions and its related soil microbial properties in continuously flooded
or intermittently drained paddy soils in Japan and Indonesia. The study in Japan comprises alluvial soil and peat, cultivated
to rice variety Nipponbare, while in Indonesia comprised alluvial soil cultivated to rice variety Siam Pandak. Intermittent drainage was performed to half number of the plot in 6 days interval, starting at tillering or heading stage
of rice, while the other half number of plot was kept flooded as control. The experiments were carried out to follow the randomized
block design with three replications. Gas samples were taken in weekly basis, except during the treatments (i.e., every 2 days
interval) and analyzed for methane (CH4) and nitrous oxide (N2O) concentrations. Soil samples were and analyzed for the population of methanogenic bacteria, denitrifiers, methane production
and consumption potentials, and methanogenic substrate. Plant growth parameters were also observed. The results showed that
intermittent drainage significantly reduced greenhouse gas emission from paddy soil of Indonesia and Japan without significant
changes in soil microbial population. The reductions of greenhouse emission from Japanese peaty and alluvial paddy soil due
to intermittent drained were about 32 and 37%, respectively. Meanwhile, the reductions in greenhouse gas emission from alluvial
soil of Indonesia due to intermittent drainage were very similar to that of in Japan, i.e., average about 37%. This suggests
that intermittent drainage can be an appropriate technology option to reduce the greenhouse gas emission from paddy soil in
Japan and Indonesia. |
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