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Aus-Aman Cropping System: New Approach for Increasing Cropping Intensity in Southwest Coastal Bangladesh

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Aus-Aman Cropping System: New Approach for Increasing Cropping Intensity in Southwest Coastal Bangladesh

  1. 1. Aus-Aman cropping system: new approach for increasing cropping intensity in southwest coastal Bangladesh Sanjida Parveen Ritu, BRRI To Phuc Tuong, IRRI Manoranjan Mondal, IRRI Shahid Ullah Talukder, BAU
  2. 2. Coastal Zone Overview <ul><li>Coastal is the most impoverish part of the country, with low cropping intensity and low productivity caused food insecurity </li></ul>
  3. 3. Coastal Zone Overview <ul><li>Main constrain for agricultural production has been defined as </li></ul><ul><ul><li>Soil and water salinity </li></ul></ul><ul><ul><li>lack of fresh water in dry season </li></ul></ul><ul><ul><li>1 mha land affected </li></ul></ul>
  4. 4. Polder Construction vs Crop Production <ul><li>To overcome constrains to agriculture, in 1960 – 1970, GOB has built 135 polders with main mandate: control salinity intrusion and tidal surge </li></ul><ul><li>Thanks to the polders, area and rice production in the coastal zone has increased </li></ul>
  5. 5. Cropping Systems after empoldering <ul><ul><li>Main crop is still single aman (wet season) rice </li></ul></ul><ul><ul><li>Aman – late Rabi (dry season nonrice) </li></ul></ul><ul><li>Changed cropping system (CPWF phase 1) in polder 30 </li></ul><ul><li>Replace low yielding (2.5 t ha -1 ) local aman rice with high yielding varieties (5.0 t ha -1 ) </li></ul><ul><li>Short duration aus (premonsoon season) rice and ensure their timely establishment </li></ul><ul><ul><li>HYV aus-HYV aman cropping system </li></ul></ul>Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Traditional Rice (2-3 t/ha) Sesame (0.5-1.0 t/ha) Traditional Rice (2-3 t/ha)
  6. 6. <ul><li>Use of groundwater for supplementary irrigation will secure aus crop establishment </li></ul><ul><li>On farm water management </li></ul><ul><ul><li>On farm storage </li></ul></ul><ul><ul><li>Rainfall </li></ul></ul>Long term Rainfall and evaporation pattern in Khulna district                                                    
  7. 7. New Cropping Systems 20 Apr 30 July 1 0 Aug 5 Dec River water EC5-15 dSm -1 River water EC 5-15 dSm -1 Rainfall ~1500 mm leaching down soil salinity Aus-Aman-Fallow Cropping System Groundwater EC 2-3dSm -1 River water EC < 2dSm -1 Rainfall and river water EC 0-2 dSm -1 3-4 t ha -1 4-5 t ha -1 T. Aman (130-140 d) Aus (100-105 d) A M J J A S O N D J F M A
  8. 8. New Cropping Systems 10 May 20 aug 30 Aug 20 nov River water EC5-15 dSm -1 River water EC 5-15 dSm -1 Rainfall ~1500 mm leaching down soil salinity Aus-Aman-Fallow Cropping System River water EC < 2dSm -1 Rainfall and river water EC 0-2 dSm -1 8-9 t ha -1 yr -1 20 May 20 aug 30 Aug 15 Dec 7-8 t ha -1 yr -1 T. Aman (~130d) Photosensitive Aus (100-105 d) A M J J A S O N D J F M A Aus (100-105 d) T. Aman (~140d) Nonphoto sensitive
  9. 9. Thank you for hearing

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