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Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia - Comparison of SRI and surrounding conventional f...
Method <ul><li>Closed-chamber method </li></ul><ul><li>Features: 30cm×30cm×60cm dimensions,  equipped with thermometer, pr...
 
 
Lombok   SRI field ( Nippon Koei ) SRI Non-SRI 08/03/20
Methane Flux CH 4  Flux   (mg C m -2  h -1 ) Error bar stands for standard deviation
Nitrous Oxide Flux N 2 O Flux   (μg N m -2  h -1 ) Error bar stands for standard deviation
CH 4  flux from intermittent irrigation Figure 2. Effect of water management on CH4 emission from a rice paddy field. The ...
Influencing Parameters Days after transplanting Straw number Time of day CH 4  flux (mg C m -2  h -1 ) Jampue
Influencing Parameters Days after transplanting Straw number Time of day CH 4  flux (mg C m -2  h -1 ) Jampue Logging
Conclusions Problems Conventional Fields? Almost same planting density  Intermittent irrigation Main difference: Seedling ...
Conclusion CH 4  Flux Water status at the time of sampling had a greater influence on CH 4  flux than did the difference b...
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0890 Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia- Comparison of SRI and Surrounding Conventional Fields

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Presenter: Kimura Sonoko Dorothea

GHG. Tokyo University of Agriculture and Technology

Published in: Business, Technology
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0890 Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia- Comparison of SRI and Surrounding Conventional Fields

  1. 1. Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia - Comparison of SRI and surrounding conventional fields - Tokyo University of Agriculture and Technology: Dr. KIMURA Sonoko Dorothea SRI   Experiment Plot +Farmers Field Tabo-Tabo Jampue Langunga Penarungan Sungsang
  2. 2. Method <ul><li>Closed-chamber method </li></ul><ul><li>Features: 30cm×30cm×60cm dimensions, equipped with thermometer, pressure bag, and gas sampling tube (foldable) </li></ul><ul><li>Measurements taken at 0, (10) and 20-minute intervals -> 10ml vacuum vial </li></ul><ul><li>  Each field: 2-3 replications </li></ul><ul><li>  N 2 O & CH 4 -> measured by GC-ECD & GC-FID </li></ul><ul><li>  Parameters: soil temperature, stem number, days after planting, plant height, variety etc. </li></ul><ul><li>  Dates: 2008 / 3 / 20-23 </li></ul>
  3. 5. Lombok   SRI field ( Nippon Koei ) SRI Non-SRI 08/03/20
  4. 6. Methane Flux CH 4 Flux   (mg C m -2 h -1 ) Error bar stands for standard deviation
  5. 7. Nitrous Oxide Flux N 2 O Flux   (μg N m -2 h -1 ) Error bar stands for standard deviation
  6. 8. CH 4 flux from intermittent irrigation Figure 2. Effect of water management on CH4 emission from a rice paddy field. The arrows indicate period of midseason drainage in the intermittent irrigation plot and the timing of final drainage in both of the plots. ( Yagi et al. 1997 )
  7. 9. Influencing Parameters Days after transplanting Straw number Time of day CH 4 flux (mg C m -2 h -1 ) Jampue
  8. 10. Influencing Parameters Days after transplanting Straw number Time of day CH 4 flux (mg C m -2 h -1 ) Jampue Logging
  9. 11. Conclusions Problems Conventional Fields? Almost same planting density Intermittent irrigation Main difference: Seedling age Measuring of CH 4 and N 2 O flux Survey: March 20-23 Emission of gas is influenced by: Irrigation timing Time of day Growth stage
  10. 12. Conclusion CH 4 Flux Water status at the time of sampling had a greater influence on CH 4 flux than did the difference between SRI and conventional methods. However, since SRI fields tend to be drained, CH 4 flux tended to be higher in conventional fields. Highest CH 4 emission was found during early growing stages with conventional methods. N 2 O Flux High variability. Unexpected negative flux in some fields. SRI fields tended to emit more N 2 O than conventional fields, but the values are in the range found for conventional paddy fields (FM Honmachi 2007; total emission 0-0.2 kg N ha -1 ) .

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