Methane emissions associated with a green manure amendment to flooded rice in California |
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Authors: | J G Lauren G S Pettygrove J M Duxbury |
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Institution: | (1) Soil, Crop and Atmospheric Sciences Department, Bradfield Hall, Cornell University, Ithaca, NY 14853, USA;(2) Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA |
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Abstract: | The goals of sustainable food production and mitigation of greenhouse gas emissions may be in conflict when green manures
are used in flooded rice systems. A field study was initiated in early spring 1992 near Sacramento, California to quantify
the potential for enhanced methane emissions following a green manure amendment to rice. Replicate flux measurements were
made twice a day every 3–4 days throughout the growing season in four treatment plots: burned rice straw, spring incorporated
rice straw, burned straw plus purple vetch and spring incorporated straw plus vetch. Seasonal methane emissions ranged from
66–136 g CH4 m−2 and were 1.5 to 1.8 times higher from the straw plus vetch treatments relative to the straw only treatments. No significant
differences in emissions were found between the two straw only treatments or the straw plus vetch treatments. Methane fluxes
were exponentially related to soil temperature, but no effect of redox potential or floodwater depth were observed. The potential
impact of these results on the global methane budget is discussed. |
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Keywords: | flooded rice green manure methane (CH4) sustainable agriculture |
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