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Wassmann - Modifying water management for rice production

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Reiner Wassman (IRRI): Modifying water management for rice production (presentation from Mitigation session at CCAFS Science Workshop, December 2010)

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Wassmann - Modifying water management for rice production

  1. 1. Modifying water management for rice production
  2. 2. BUT   Rice  is  not  just  a  vic1m  of   climate  change,  it  is  also  one  of  the  causes  
  3. 3. How  methane  is  produced  by  irrigated  rice  => Rice fields account for 5 -20 % of all global methane sources
  4. 4. ‘Closed Chamber‘ Method
  5. 5. Diurnal patternsPooled field data, Buendia et al. 1997
  6. 6. Relevance for CCAFS?One of the Fund Council comments:o Articulate potential contribution to development of global standards for measuring GHG emissions from agriculture
  7. 7. Unit plot size: 5 x 5 m
  8. 8. Field stations of the Intenational Rice Research Institute (projects funded by US-EPA and UNDP/ GEF) IRRI/ Los BanosIrrigatedRainfedDeepwater
  9. 9. View of the field chambers(for flooded/non-flooded condition)
  10. 10. Mid-season drainage Days after plantingField experiment at Hangzhou, China (Wassmann et al., 2000)
  11. 11. ‘Site-Specific NutrientManagement’ (SSNM)   Applying nutrients as and when needed   Adjusting nutrient application to crop needs in given location and seasonLeaf Color Chart
  12. 12. "   downward flux – atmospheric CO2 taken up by the rice plant for photosynthesis"   upward flux – CO2 being released from ecosystem respiration
  13. 13. Modelling emissions using DNDC model (DeNitrification-DeComposition)InputsSOILTexture, pH, => for 28 cropsC and N contentCLIMATETemp., rainfallMANAGEMENTN inputs, tillage,irrigation etc. Outputs EMISSIONS (CO2, CH4 , N2O, NO, NO2, NH3 ) WATER BALANCE (Evaporation, transpiration)from Li et al. 2000 SOIL PROFILES (C and N contents, moisture etc.) CROP PHENOLOGY (biomass etc)
  14. 14. fromMatthewset al. 2000
  15. 15. ConclusionMitigation:Rice systems have tobecome more efficientin terms of…•  Water use•  Fertilizer uptake•  Harvest index Challenges of Mitigation = Challenges of advanced resource management

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