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Straw Application Effects on Methane and Oxygen Exchange and Growth in Rice
Author(s) -
Kludze H. K.,
DeLaune R. D.
Publication year - 1995
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1995.03615995005900030027x
Subject(s) - loam , methanogenesis , straw , transplanting , oryza sativa , agronomy , cultivar , methane , panicle , shoot , methane emissions , paddy field , chemistry , environmental science , soil water , biology , soil science , sowing , biochemistry , organic chemistry , gene
Currently, there is a paucity of information on plant‐soil interactive effects and plant‐related factors that control CH 4 production and its emission from rice ( Oryza sativa L.) paddies. Laboratory studies were conducted to evaluate the effects of rice straw application rates on growth, root porosity (POR), and gas (O 2 and CH 4 ) exchange in rice under continuously flooded conditions. Three rice cultivars were grown in Crowley silt loam (fine, montmorillonitic, thermic Typic Albaqualf) amended with two levels (11 and 22 t ha −1 ) of rice straw. Plants were harvested for growth, POR, and radial oxygen loss (ROL) estimates at 40 d after transplanting. Methane measurements were made at 20, 30, and 40 d after transplanting. Plant growth and straw application rates were negatively correlated. Variations existed among cultivars in parameters studied. Although POR was enhanced by the higher application rate (22 t ha −1 ), reductions in shoot and root growth consequently resulted in reduced ROL. Two of the cultivars exhibited significant POR‐ROL correlations. Highest CH 4 emissions occurred at the 11 t ha −1 application rate. At the 22 t ha −1 application rate, CH 4 emissions were significantly reduced in all vegetated treatments, although emissions from unvegetated treatments were enhanced. Results indicated that reductions in CH 4 emissions at the higher straw application rate resulted from reduction in the total diffusive pathway of the gas and were not due to the mitigation of methanogenesis.