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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
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.
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
Objectives 
To evaluate combination of planting dates and aman varieties 
for triple rice system 
● Feasibility 
● System yield 
● Irrigation water requirement for boro
Basic site information 
● PSTU farm, Patuakhali 
● Clay loam 
● Lowland 
Drain & Water source ~100 m
Experimental design 
Treatments: 
➢ E1-3: aus sowing dates/establishment method 
➢ V1-4: aman varieties 
➢ D1-5:boro sowing dates
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)
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)
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
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
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
● 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
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
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
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
Irrigation monitoring 
● The amount of water/plot: 
○ pump discharge rate (R), duration of irrigation (T), and plot 
area (A). 
○ Formula: (R X T)/A
T. Aman 2012
Field duration of aman crop
Field water depth during aman 2012
Effect of sowing date and variety on grain yield of 
aman
Field duration of aus crop
Effect of sowing date on aus yield
Aus crop
Effect of sowing date on boro duration
Daily mean temperature during boro 2012-13 and 
2013-14
Effect of sowing date on yield of boro
Boro crop
Total system grain yield
Duration of the cropping pattern in the field during 
2012-13 and 2013-14
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
Thank you
Irrigation water requirement during 
boro 2012-13 to 2013-14
Irrigation water productivity(kg/ha-mm) of BRRI 
dhan28 during boro 2012-13 to 2013-14

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

  • 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. 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. 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. Objectives To evaluate combination of planting dates and aman varieties for triple rice system ● Feasibility ● System yield ● Irrigation water requirement for boro
  • 6. Basic site information ● PSTU farm, Patuakhali ● Clay loam ● Lowland Drain & Water source ~100 m
  • 7. Experimental design Treatments: ➢ E1-3: aus sowing dates/establishment method ➢ V1-4: aman varieties ➢ D1-5:boro sowing dates
  • 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. 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. 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. 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. 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. ● 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. 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. 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. 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. Irrigation monitoring ● The amount of water/plot: ○ pump discharge rate (R), duration of irrigation (T), and plot area (A). ○ Formula: (R X T)/A
  • 19. Field duration of aman crop
  • 20. Field water depth during aman 2012
  • 21. Effect of sowing date and variety on grain yield of aman
  • 22. Field duration of aus crop
  • 23. Effect of sowing date on aus yield
  • 25. Effect of sowing date on boro duration
  • 26. Daily mean temperature during boro 2012-13 and 2013-14
  • 27. Effect of sowing date on yield of boro
  • 30. Duration of the cropping pattern in the field during 2012-13 and 2013-14
  • 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
  • 33. Irrigation water requirement during boro 2012-13 to 2013-14
  • 34. Irrigation water productivity(kg/ha-mm) of BRRI dhan28 during boro 2012-13 to 2013-14