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Triple rice in a year: Is it feasible for low salinity areas of the coastal zone of Bangladesh?

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Triple rice in a year: Is it feasible for low salinity areas of the coastal zone of Bangladesh?

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By N.K. Saha, M.K. Mondal, E. Humphreys, M.H. Rashid, P.C. Paul, S.P. Ritu

By N.K. Saha, M.K. Mondal, E. Humphreys, M.H. Rashid, P.C. Paul, S.P. Ritu

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Triple rice in a year: Is it feasible for low salinity areas of the coastal zone of Bangladesh?

  1. 1. Welcome
  2. 2. Triple rice in a year: Is it feasible for low salinity areas of the coastal zone of Bangladesh? N. K. Saha, M. K. Mondal, E. Humphreys, M. H. Rashid, P. C. Paul, S. P. Ritu
  3. 3. Rationale ● Fresh water all the year round in much of Barisal ● Current cropping patterns: ○ Fallow/Aus-T.Aman-Fallow/Keshari ○ 0-3 2-3.5 0-1 t/ha ● Possible technology to fit 3 rice crops in a year ● 50% cultivable land medium high (SRDI 2010) ● HYV rice ● River water for Boro, river water & rainfall for Aus drainage to Aman crop.
  4. 4. Hypotheses of the study M J J A S O N D J F M A M T. Aman (130-140 d) Boro (140-145 d) Aus (100-105 d) ● 3 high yielding rice crops per year IS possible in coastal zone where ○ fresh water available throughout the year ○ ability to drain excess water
  5. 5. Objectives To evaluate combination of planting dates and aman varieties for triple rice system ● Feasibility ● System yield ● Irrigation water requirement for boro
  6. 6. Basic site information ● PSTU farm, Patuakhali ● Clay loam ● Lowland Drain & Water source ~100 m
  7. 7. Experimental design Treatments: ➢ E1-3: aus sowing dates/establishment method ➢ V1-4: aman varieties ➢ D1-5:boro sowing dates
  8. 8. Aus establishment treatments (E) ● E1= Sown 10 April, transplanted 1 May ● E2= Sown on 25 April, transplanted 15 May ● E3= Sown Direct (wet) seeded 1 May Variety: OM1490 (100 days)
  9. 9. Aman variety treatments (V) RULE: Transplanting date 10 d after harvest of each aus treatment E1 and E2: ● V1 BRRI dhan49 (duration 135 d) ● V2 BRRI dhan52 (duration 145 d, submergent tolerant) E3: ● V3 BRRI dhan33 (duration 118 d) ● V4 BRRI dhan53 (duration 125 d)
  10. 10. Boro sowing date treatments (D) RULES: ● First transplanting date NOT less than 10 d after aman harvest, & NOT before 15 November ● Second transplanting date 15 d after first ● D1= 15 November ● D2= 20 November ● D3= 30 November ● D4= 05 December ● D5= 15 December
  11. 11. Treatment Combinations Aus Aman Boro CS E1 =1 May V1= BRRI dhan49 D1= 15 November 1 D2 = 30 November 2 V2 =BRRI dhan52 D1= 15 November 3 D2 = 30 November 4 E2=15 May V1 =BRRI dhan49 D1= 30 November 5 D2= 15 December 6 V2 =BRRI dhan52 D1=30 November 7 D2=15 December 8 E3=1 May V1 =BRRI dhan33 D1= 20 November 9 D2= 05 December 10 V2= BRRI dhan53 D1=20 November 11 D2= o5 December 12
  12. 12. Crop management information ● Crop establishment: Transplanting (all crops): 21 day-old seedlings 20 cm x 20 cm Direct seeded aus (Dsaus): 20 cm row spacing
  13. 13. ● Fertilizers: Season N (kg/ha) P2O5 (kg/ha) K2O (kg/ha) CaSO4 (kg/ha) ZnSO4 (kg/ha) Aus 100 60 40 60 10 Aman 100 60 40 60 10 Boro 120 60 40 60 10 DS.aus 10-15 DAE, 30-35 DAE, 45-50 DAE(5-7DBPI) and 60-65 DAE T.Aus T.Aman Final land preparation, 25 DAT, 5-7 DBPI and at heading Boro BRRI, 2012
  14. 14. Irrigation: ● T.Aus and DSaus – irrigated as needed from canal ● Boro– Fully irrigated from canal (pumping) Drainage: Excess water during aus & aman– at low tide
  15. 15. Weed, pest and disease management • Good control of pests and diseases (BRRI, 2012 recs) (except brown spot in aman 2013 and boro 2012-13 first 2 sowings) • plastic barrier to keep rats out • netting to keep birds out Bird nets Plastic barrier
  16. 16. Crop Monitoring ● Phenology dates: ● PI, FL, PM ● Biomass: fortnightly ● Yield and yield components: ● Panicles/m2 ● Florets/panicle ● Floret fertility ● 1000 grain wt. ● Grain & straw yield
  17. 17. Irrigation monitoring ● The amount of water/plot: ○ pump discharge rate (R), duration of irrigation (T), and plot area (A). ○ Formula: (R X T)/A
  18. 18. T. Aman 2012
  19. 19. Field duration of aman crop
  20. 20. Field water depth during aman 2012
  21. 21. Effect of sowing date and variety on grain yield of aman
  22. 22. Field duration of aus crop
  23. 23. Effect of sowing date on aus yield
  24. 24. Aus crop
  25. 25. Effect of sowing date on boro duration
  26. 26. Daily mean temperature during boro 2012-13 and 2013-14
  27. 27. Effect of sowing date on yield of boro
  28. 28. Boro crop
  29. 29. Total system grain yield
  30. 30. Duration of the cropping pattern in the field during 2012-13 and 2013-14
  31. 31. Conclusion & Recommendation ● It is feasible to fit 3 rice crop in a year ● 13.4 to 17.2 t/ha/yr about 3 x farmers’ harvest ● Average 10-12 day turn around period ● Need for model simulation to evaluate performance over range of weather conditions ● Will pests & diseases become a problem in triple rice systems – need for ecologically friendly management systems
  32. 32. Thank you
  33. 33. Irrigation water requirement during boro 2012-13 to 2013-14
  34. 34. Irrigation water productivity(kg/ha-mm) of BRRI dhan28 during boro 2012-13 to 2013-14

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