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Contrasting effects of EDTA applications on the fluxes of methane and nitrous oxide emissions from straw‐treated rice paddy soils
Author(s) -
Pramanik Prabhat,
Kim Pil Joo
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7727
Subject(s) - nitrous oxide , methane , soil water , chemistry , carbon dioxide , straw , paddy field , environmental chemistry , nitrogen , agronomy , nitrate , greenhouse gas , environmental science , soil science , inorganic chemistry , ecology , organic chemistry , biology
BACKGROUND Submerged rice paddy soils are the major anthropogenic source of methane ( CH 4 ) emission to the atmosphere. Straw incorporation for sustaining soil organic C pool increases CH 4 emission flux from rice paddy soils. Though the rate of nitrous oxide ( N 2 O ) emission is much less than CH 4 , 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 N 2 O emission and on GWP due to CH 4 and N 2 O emissions has not been evaluated before. RESULTS The emission of CH 4 gas from submerged soil may be mitigated by EDTA application; however, it also increases concentration of nitrate‐N in soil, the precursor of N 2 O gas formation under anaerobic condition. In this experiment, irrespective of straw application, EDTA ‐treated soils emitted less CH 4 to the atmosphere than the corresponding control. Though N 2 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