Facing the ecology of Green Revolution rice   The controversy around the System of Rice Intensification and its consequenc...
menu <ul><li>Rice cultivation: conventional and SRI methods </li></ul><ul><li>The SRI controversy </li></ul><ul><li>The hi...
Rice cultivation  <ul><li>Conventional methods: consider plant growth set mainly by genetic potential </li></ul><ul><ul><l...
Rice cultivation  <ul><li>SRI: consider growth to be set by root development and soil system performance </li></ul><ul><ul...
Conventional transplanting
SRI transplanting
SRI field one week after transplanting
SRI field 7 weeks after transplanting
The controversy <ul><li>Main claims from SRI proponents: </li></ul><ul><ul><li>Yield potential (on-farm) similar to or hig...
The controversy <ul><li>Main response from IRRI-related researchers </li></ul><ul><ul><li>Yields reported are not proven a...
The controversy Year Journals Main authors Affiliation Posi-tive 2002, 2005-07 Agric. Systems, Field Crops Research, TAA N...
The controversy <ul><li>Some triggers and causes: </li></ul><ul><ul><li>Wide exposure in practice and in science ( Nature ...
The historical legacy of IRRI <ul><li>IRRI is known for ‘genetic fix’ </li></ul><ul><ul><li>But genes need an environment ...
The historical legacy of IRRI <ul><li>GxE interaction studied through (cybernetic) crop models </li></ul><ul><ul><li>Colin...
Conclusion <ul><li>Rice ecology in IRRI (and partner institutes) works to a (genetic) optimum </li></ul><ul><ul><li>Physio...
Prospects <ul><li>More lateral approaches (like SRI) are hard to stop </li></ul><ul><li>Biotech is not the spark for a new...
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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

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Presenter: Rajendra Uprety

Subject Country: Nepal

Published in: Technology, Education
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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

  1. 1. Facing the ecology of Green Revolution rice The controversy around the System of Rice Intensification and its consequences for future rice improvement strategies
  2. 2. menu <ul><li>Rice cultivation: conventional and SRI methods </li></ul><ul><li>The SRI controversy </li></ul><ul><li>The historical legacy of IRRI </li></ul><ul><li>Conclusion/prospects </li></ul>
  3. 3. Rice cultivation <ul><li>Conventional methods: consider plant growth set mainly by genetic potential </li></ul><ul><ul><li>Transplanting after 15-30 days, 2-3 seedlings/hill </li></ul></ul><ul><ul><li>Permanently flooded fields </li></ul></ul><ul><ul><li>Application of fertilizer and pesticide </li></ul></ul>
  4. 4. Rice cultivation <ul><li>SRI: consider growth to be set by root development and soil system performance </li></ul><ul><ul><li>Transplanting after 8-12 days, single seedling/hill </li></ul></ul><ul><ul><li>Alternately flooding and drying the field </li></ul></ul><ul><ul><li>Compost and weeding/soil aeration </li></ul></ul>
  5. 5. Conventional transplanting
  6. 6. SRI transplanting
  7. 7. SRI field one week after transplanting
  8. 8. SRI field 7 weeks after transplanting
  9. 9. The controversy <ul><li>Main claims from SRI proponents: </li></ul><ul><ul><li>Yield potential (on-farm) similar to or higher than HYVs (on-station) </li></ul></ul><ul><ul><li>New research agenda, stresses on-farm experimentation and root-plant interaction </li></ul></ul>
  10. 10. The controversy <ul><li>Main response from IRRI-related researchers </li></ul><ul><ul><li>Yields reported are not proven and unlikely </li></ul></ul><ul><ul><li>All the necessary (theoretical) knowledge on rice is already attained </li></ul></ul>
  11. 11. 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
  12. 12. The controversy <ul><li>Some triggers and causes: </li></ul><ul><ul><li>Wide exposure in practice and in science ( Nature publication) – a competitor/alternative for the Green Revolution-genetic strategy? </li></ul></ul><ul><ul><li>Yield claims exceed conventional crop (theoretical) models </li></ul></ul><ul><ul><li>Network effects and institutional thinking </li></ul></ul>
  13. 13. The historical legacy of IRRI <ul><li>IRRI is known for ‘genetic fix’ </li></ul><ul><ul><li>But genes need an environment to express in traits (GxE) </li></ul></ul><ul><li>The E-component is focus of physiology and agronomy </li></ul><ul><ul><li>Physiology: energy conversion, nutrient uptake, growth stages </li></ul></ul><ul><ul><li>Agronomy: plant density, fertilizer application, cropping calender </li></ul></ul>
  14. 14. The historical legacy of IRRI <ul><li>GxE interaction studied through (cybernetic) crop models </li></ul><ul><ul><li>Colin Donald (1968): ideotype breeding </li></ul></ul><ul><ul><li>Ideotype: plant design based on the model’s optimum outcome </li></ul></ul><ul><ul><li>Models are calibrated on experimental plots </li></ul></ul>
  15. 15. Conclusion <ul><li>Rice ecology in IRRI (and partner institutes) works to a (genetic) optimum </li></ul><ul><ul><li>Physiologic and agronomic processes serve the ideotype </li></ul></ul><ul><ul><li>In-field and between-field variation is largely ignored </li></ul></ul><ul><ul><li>Only the top can be on top </li></ul></ul>
  16. 16. Prospects <ul><li>More lateral approaches (like SRI) are hard to stop </li></ul><ul><li>Biotech is not the spark for a new GR </li></ul><ul><li>New IRRI is a knowledge bank and training centre </li></ul>

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