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  • Title: Contrasting effects of EDTA applications on the fluxes of methane and nitrous oxide emissions from straw-treated rice paddy soils.
    Author: Pramanik P, Kim PJ.
    Journal: J Sci Food Agric; 2017 Jan; 97(1):278-283. PubMed ID: 27010126.
    Abstract:
    BACKGROUND: Submerged rice paddy soils are the major anthropogenic source of methane (CH4 ) emission to the atmosphere. Straw incorporation for sustaining soil organic C pool increases CH4 emission flux from rice paddy soils. Though the rate of nitrous oxide (N2 O) emission is much less than CH4 , the former has 298 times higher global warming potential (GWP) than equivalent quantity of carbon dioxide. The effect of chelating agents, such as EDTA, on N2 O emission and on GWP due to CH4 and N2 O emissions has not been evaluated before. RESULTS: The emission of CH4 gas from submerged soil may be mitigated by EDTA application; however, it also increases concentration of nitrate-N in soil, the precursor of N2 O gas formation under anaerobic condition. In this experiment, irrespective of straw application, EDTA-treated soils emitted less CH4 to the atmosphere than the corresponding control. Though N2 O emission was increased from soil due to EDTA applications, total GWP was at least 15% reduced in EDTA treated soils during rice cultivation. The plant growth and rice grain yield was not affected by EDTA application. CONCLUSION: EDTA application at 5.0 ppm might be used to reduce total global warming potential during rice cultivation. © 2016 Society of Chemical Industry.
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