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Research Detail

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Dr Manoranjan Mondal
Senior Scientific Officer
IWM, BRRI, Gazipur

Dr Sanjda Parveen Ritu
Scientific Officer
IWM, BRRI, Gazipur

A field experiment was conducted at kismat fultola village in Khulna district to quantify water requirement and yield of the dry season rice (Boro rice) under different time of crop establishment and to determine the most appropriate time for dry season rice cultivation, and hence the optimal Boro rice calendar. The on-farm experimental results indicated that sowing seeds in the second week of November (7-15 November) produced 4-5 t/ha rice yield in the dry/Boro season in the coastal region of Bangladesh and required about 690 mm water from land preparation to harvest of the crop. Seeding before 7 November produced very low rice yield due to cold stress at the critical reproductive period of the crop. The minimum temperature in January in the coastal region remained below 150C indicated that early sowings of seeds, i.e., earlier than 7 November, for rice cultivation are more prone to low yield output from unfertilized spikelets. On the other hand, late sowing, i.e., later than 15 November, will not limit yield due to cold stress, but water availability will reduce the irrigated area.

  Coastal zone, Seeding time, Water productivity
  Kismat Fultola village under Batiaghata upazila in Khulna district
  01-07-2006
  30-06-2007
  Crop-Soil-Water Management
  Command area development
  1. To quantify water requirement and yield of the dry season rice (Boro rice) under different time of crop establishment;
  2. To determine the most appropriate time for dry season rice cultivation, and hence the optimal Boro rice calendar; and
  3. To quantify the amount of water needed from the reservoir for successful cultivation of Boro rice and the area that can be grown with Boro rice cropping through effective management of the available land and water resources under the prevailing agro-climatic situation.

Experiments were carried out at Kismat Fultola village under Batiaghata upazila (sub-district, lowest administrative unit) in Khulna district located in the southwest region of Bangladesh in split plot design during the dry/Boro seasons of 2005-06 and 2006-07. Date of seeding was placed in the main plot and rice variety in the sub plot and was replicated 4 times. The seeding dates were:D1 = Seeding on 22 October, 1 Nov, 7 Nov and 15 Nov and the variety were   V1 = BRRI dhan28  and  PVS B8.   The plot size was 8 m x 6 m and all bunds were compacted to prevent seepage to and from adjacent plots. Field layout and bund construction were done prior to land preparation. The size of the main bunds was 50 cm x 20 cm and secondary bunds was 30 cm x 20 cm. Besides, to minimize seepage water from adjoining plots, plastic linings were installed around the perimeter of the main plots at a depth of 30 cm into the soil.

  Proceedings of BRRI Annual Internal Review for 2007
  
Funding Source:
1.   Budget:  
  

The highest yield of BRRI dhan28 (5036 kg/ha) was obtained when seeding was done on 7 November (D3), which was not significantly different than that obtained on 15 November (D4) seeding. BRRI dhan28 produced significantly lower yield in the first seeding (D1=22 October) and second seeding (D2= 1 November) dates than that obtained in D3 and D4, mostly because of low temperature effect at the PI stage of the crop. All the yield contributing characters of BRRI dhan28 were severely affected in the first and second seeding and were significantly lower than that recorded in other seeding dates (D3 and D4) either at 1% or at 5% level of significance. Among the yield components, filled spikelets were affected the most. Even the panicles per m2 and the panicle length of BRRI dhan28 was also affected by cold stress in D1 and D2. The yield and yield components of PVS B8 were also very much affected low temperature. The highest yield of PVS B8 was obtained in the third seeding (D3), and it was at par with D4 seeding date. Yield of PVS B8 in D1 and D2 seeding dates was significantly lower than other establishment period (D3 and D4), mainly because of cold temperature like that observed in BRRI dhan28.

  Report/Proceedings
  


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