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Improving Drainage is Crucial for Cropping Intensification in the Poldered Coastal Zones of Bangladesh
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Improving Drainage is Crucial for Cropping Intensification in the Poldered Coastal Zones of Bangladesh

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  • 1. Improving drainage is crucial for cropping intensification in the polderred coastal zones of Bangladesh To Phuc Tuong, IRRI Manoranjan Mondal, IRRI Sanjida Parveen Ritu, BRRI Abul Kalam Sharifullah, BARD Elizabeth Humphreys, IRRI
  • 2. New Cropping Systems Development
    • With new varieties
      • Short duration
      • Non photoperiod sensitive
      • Salt tolerance
    • Cropping systems research
    • On farm water management
      • On farm storage
      • Rainfall
    • It is possible to have 2 or 3 crops per year which can avoid salinity and overcoming the water shortage in the dry season
    Sesame-Aman-F = 3-4 t/ha Boro-F-Aman = 11-13 t/ha Aus-Aman-Rabi = 12-42 t/ha
  • 3. New Cropping Systems 1 May 20 July 1 Aug 25 Nov 5 Dec 5 Apr River water EC5-15 dSm -1 River water EC 5-15 dSm -1 Rainfall ~1500 mm leaching down soil salinity Aus-Aman-Boro Cropping System Boro (140-145 d) T. Aman (130-140 d) Aus (100-105 d) M J J A S O N D J F M A M
  • 4. New Cropping System 10 Apr 30 June 10 July 15 Nov 1 5Apr Rainfall ~1500 mm leaching down soil salinity River water EC 5-15 dSm -1 River water EC 5-15 dSm -1 Aus-Aman-Rabi Cropping System Rabi (130-140 d) 1 Dec T. Aman (130-140 d) Aus (100-105 d) A M J J A S O N D J F M A
  • 5. Constrains to New Cropping Systems Deep flooding at the beginning of rainy season constrains the establishment of aman rice and adoption of modern high yielding varieties Prolonged water log at the end of rainy season delay establishment of rabi crop A M J J A S O N D J F M A T. Aman (130-140 d) Aus (100-105 d) Rabi ( 130-140 d)
  • 6. High Tide Low Tide Land Land Surface Embankment River Bed Sluice gate 1-2 m How to Adopt New Cropping Systems?
    • To realize the new cropping system, it is crucial to improve the drainage of the polders
    • Can drainage be improved? Yes
    2-3 m
  • 7.
    • Previous role: salinity and tidal surge prevention
    • Now with new cropping systems, the polders have additional roles
      • Water supply and storage
      • Drainage
    • New function: po lder has to be treated as one “ water management unit ”
    Re-assess the Role of Polders in New Cropping Systems
  • 8. Water Management in Polder: Institutional Level
    • Various institution “manage” different part of the polder
    • BWDB: construction and maintenance of the embankment and sluices
    • BADC: small irrigation system within polders
    • LEGD: outside polders
    • No one looks at polder is a comprehensive water management unit
  • 9. Conclusion
    • With advances in germplasm, on-farm water management, it is possible to have 2-3 crops/year despite of salinity and water shortage in the dry season
    • We have to improve drainage
    • Polders have been built 40 years, ago, with the new cropping systems…..polders have new roles
    • New roles need new management, new institution set up
  • 10. THANK YOU

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