Populations of methanogenic bacteria in paddy field soil under double cropping conditions (rice-wheat)
1995
Asakawa, S. | Hayano, K.
The methanogenic populations able to use H(2)-CO(2), methanol, and acetate were investigated in paddy field soil in situ under double cropping conditions [rice (Oryza sativa L.) as a summer crop under flooded conditions and wheat (Triticum aestivum L.) as an upland winter crop] over 2 years approximately bimonthly by the most probable number method. Three fields, one without fertilizer, one treated with inorganic fertilizer (mixed fertilizer including urea, ammonium phosphate, and potassium sulfate), and one treated with wheat straw plus inorganic fertilizer, were examined. The population of H(2)-CO(2), methanol, and acetate utilizers in the paddy field soil at a depth of 1 - 6 cm was 10(3) - 10(4), 10(4) - 10(5), and 10(4) - 10(5) g(-1) dry soil, respectively. These values were almost constant during the 2 years irrespective of moisture regime (flooded or nonflooded), crop (rice or wheat), fertilizer treatment, and soil depth (0-1, 1-10, and 10-20 cm).
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