Sulfate content influencing methane production and emission from incubated soil and rice-planted soil in Northeast Thailand(Fertilizers and soil amendments)

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概要

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• This study was conducted using four soil treatments (0, 22.5, 45 and 90mg SO^<2->_4 kg^<-1>) with balanced amounts of nitrogen (N), phosphorus pentoxide (P_2O_5) and potassium oxide (K_2O) for each treatment, provided using ammonium phosphate sulfate (42% of sulfate), rock phosphate, potassium chloride and urea. These treatments were employed in incubation and jar experiments to investigate methane (CH_4) production, redox potential (Eh) and pH of the soil. The same treatments were also used in potted soil planted with rice (Oryza sativa L.). In addition, urea-excluded treatments were also included in the incubation and jar experiments. The results showed that the presence of sulfate (SO^<2->_4) reduced CH_4 production from the incubation experiment. Treatments excluding urea produced larger amounts of CH_4 than urea-amended ones. In the jar experiment, the soil Eh decreased from 486 to -412mV with increased duration of flooding. In general, the presence of SO^<2->_4 delayed the drop of Eh. The submerged soil with the highest amount of SO^<2->_4 at 90mg SO^<2->_4kg^<-1> had the lowest pH compared to other treatments. In a subsequent pot experiment, rice-planted soil showed that CH_4 emission was suppressed through the growing period with increasing SO^<2->_4 content of 45 and 90mg SO^<2->_4kg^<-1>. This suppressing effect of increasing SO^<2->_4 application was clearly shown at the early growing period. The results suggest that sulfate has the potential to mitigate methane production and emission from paddy soil. However, the effects of high sulfate levels on rice yields need further study in the paddy field.

• 一般社団法人日本土壌肥料学会の論文

著者

• Inubushi Kazuyuki

  Department Of Bioproduction Science Graduate School Of Horticulture Chiba University

• RO Sophoanrith

  Section of Land Resources and Environment, Department of Plant Science and Agricultural Resources, K

• SEANJAN Patcharee

  Section of Land Resources and Environment, Department of Plant Science and Agricultural Resources, K

• TULAPHITAK Thepparit

  Section of Land Resources and Environment, Department of Plant Science and Agricultural Resources, K

• Ro Sophoanrith

  Section Of Land Resources And Environment Department Of Plant Science And Agricultural Resources Kho

• Tulaphitak Thepparit

  Section Of Land Resources And Environment Department Of Plant Science And Agricultural Resources Khon Kaen University

• Seanjan Patcharee

  Section Of Land Resources And Environment Department Of Plant Science And Agricultural Resources Khon Kaen University

関連論文

• Carbon Dynamics in Submerged Soil Microcosms as Influenced by Elevated CO_2 and Temperature
• Sulfate content influencing methane production and emission from incubated soil and rice-planted soil in Northeast Thailand(Fertilizers and soil amendments)
• Effect of elevated CO_2 and temperature on microbial biomass nitrogen and nitrogen mineralization in submerged soil microcosms

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