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Effects of rice‐straw and phosphorus application on production and emission of methane from tropical rice soil
Author(s) -
Rath Arun Kumar,
Ramakrishnan B.,
Rao V. R.,
Sethunathan N.
Publication year - 2005
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.200421604
Subject(s) - agronomy , straw , amendment , rice straw , methanogenesis , methane , chemistry , environmental science , phosphorus , soil water , biology , soil science , organic chemistry , political science , law
Rice‐straw amendment increased methane production by 3‐fold over that of unamended control. Application of P as single superphosphate at 100 μg (g soil) –1 inhibited methane (CH 4 ) production distinctly in flooded alluvial rice soil, in the absence more than in the presence of rice straw. CH 4 emission from rice plants (cv. IR72) from alluvial soil treated with single superphosphate as basal application, in the presence and absence of rice straw, and held under non‐flooded and flooded conditions showed distinct variations. CH 4 emission from non‐flooded soil amended with rice straw was high and almost similar to that of flooded soil without rice‐straw amendment. The cumulative CH 4 efflux was highest (1041 mg pot –1 ) in rice‐straw‐amended flooded soil. Appreciable methanogenic reactions in rice‐straw‐amended soils were evident under both flooded and non‐flooded conditions. Rice‐straw application substantially altered the balance between total aerobic and anaerobic microorganisms even in non‐flooded soil. The mitigating effects of single‐superphosphate application or low‐moisture regime on CH 4 production and emission were almost nullified due to enhanced activities of methanogenic archaea in the presence of rice straw.