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0735 Facing the Ecology of Green Revolution Rice: The Controversy Around the System of Rice Intensification and its Consequences for Future Rice Improvement Strategies
 

0735 Facing the Ecology of Green Revolution Rice: The Controversy Around the System of Rice Intensification and its Consequences for Future Rice Improvement Strategies

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Presenter: Rajendra Uprety

Presenter: Rajendra Uprety

Subject Country: Nepal

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    0735 Facing the Ecology of Green Revolution Rice: The Controversy Around the System of Rice Intensification and its Consequences for Future Rice Improvement Strategies 0735 Facing the Ecology of Green Revolution Rice: The Controversy Around the System of Rice Intensification and its Consequences for Future Rice Improvement Strategies Presentation Transcript

    • Facing the ecology of Green Revolution rice The controversy around the System of Rice Intensification and its consequences for future rice improvement strategies
    • menu
      • Rice cultivation: conventional and SRI methods
      • The SRI controversy
      • The historical legacy of IRRI
      • Conclusion/prospects
    • Rice cultivation
      • Conventional methods: consider plant growth set mainly by genetic potential
        • Transplanting after 15-30 days, 2-3 seedlings/hill
        • Permanently flooded fields
        • Application of fertilizer and pesticide
    • Rice cultivation
      • SRI: consider growth to be set by root development and soil system performance
        • Transplanting after 8-12 days, single seedling/hill
        • Alternately flooding and drying the field
        • Compost and weeding/soil aeration
    • Conventional transplanting
    • SRI transplanting
    • SRI field one week after transplanting
    • SRI field 7 weeks after transplanting
    • The controversy
      • Main claims from SRI proponents:
        • Yield potential (on-farm) similar to or higher than HYVs (on-station)
        • New research agenda, stresses on-farm experimentation and root-plant interaction
    • The controversy
      • Main response from IRRI-related researchers
        • Yields reported are not proven and unlikely
        • All the necessary (theoretical) knowledge on rice is already attained
    • The controversy Year Journals Main authors Affiliation Posi-tive 2002, 2005-07 Agric. Systems, Field Crops Research, TAA Newsletter, IJAS Stoop, Kassam, Uphoff Free-lance, FAO, CIIFAD (Cornell University) Neu-tral 2004 Nature Surridge News editor Nature Nega-tive 2004-07 Agric. Syst., Field Crops Research, TAA Newsletter Sheehy, Dobermann, Cassman, McDonald, Lenné IRRI, U of Nebraska, Cornell University, Univ. of Greenwich
    • The controversy
      • Some triggers and causes:
        • Wide exposure in practice and in science ( Nature publication) – a competitor/alternative for the Green Revolution-genetic strategy?
        • Yield claims exceed conventional crop (theoretical) models
        • Network effects and institutional thinking
    • The historical legacy of IRRI
      • IRRI is known for ‘genetic fix’
        • But genes need an environment to express in traits (GxE)
      • The E-component is focus of physiology and agronomy
        • Physiology: energy conversion, nutrient uptake, growth stages
        • Agronomy: plant density, fertilizer application, cropping calender
    • The historical legacy of IRRI
      • GxE interaction studied through (cybernetic) crop models
        • Colin Donald (1968): ideotype breeding
        • Ideotype: plant design based on the model’s optimum outcome
        • Models are calibrated on experimental plots
    • Conclusion
      • Rice ecology in IRRI (and partner institutes) works to a (genetic) optimum
        • Physiologic and agronomic processes serve the ideotype
        • In-field and between-field variation is largely ignored
        • Only the top can be on top
    • Prospects
      • More lateral approaches (like SRI) are hard to stop
      • Biotech is not the spark for a new GR
      • New IRRI is a knowledge bank and training centre