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Research Detail

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Dr M Mahbubul Alam
SSO
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh

Dr M A Rashid
CSO and Head
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh

A field experiment was conducted to study the relative drought tolerance of the T. Aman varieties based on the yield performance and to find out suitable T. Aman variety for drought prone area at BRRI farm, Gazipur. Rainfall and Pan evaporation data were collected regularly. Decadal rainfall and Pan evaporation was compared to understand the drought stress. It indicated that there was no rainfall during 3rd decade of October to November. Due to opening of the irrigation outlet some irrigation water enters in the experimental field on 24th October 2011. The stress was observed after 1st week of November. The medium and long duration varieties were provided with 2 supplementary irrigation in the 1st and 2nd week of November 2010. From results it was shown that the mean number of panicles per square meter in the irrigated plots varies from 174-244 and in the rainfed plots varies from 171-253. Higher yield was obtained in the irrigated plots of BRRI dhan34 and BRRI dhan44 due to higher number of filled grain per panicle. Yield was higher due to higher number of panicle per unit area and filled grain per panicle in the irrigated plots of BR11, BR23, BRRI dhan30, BRRI dhan31, BRRI dhan40, BRRI dhan41 and BRRI dhan44.The study results showed that drought stress affect adversely on the yield of long duration T. Aman varieties. BRRI dhan40 and BRRI dhan41 were found less responsive to drought stress.

  1.  
  Short duration variety, Decade, Drought
  BRRI farm, Gazipur
  01-07-2010
  30-12-2010
  Crop-Soil-Water Management
  Drought
  1. To study the relative drought tolerance of the T. Aman varieties based on the yield performance.
  2. To find out suitable T. Aman variety for drought prone area.

Rainfall and Pan evaporation data were collected regularly. Decadal rainfall and Pan evaporation was compared to understand the drought stress.  It indicated that there was no rainfall during 3rd decade of October to November. Due to opening of the irrigation outlet some irrigation water enters in the experimental field on 24th October 2011. The stress was observed after 1st week of November.

  Proceedings of the BRRI Annual Internal Review for 2011, BRRI, Gazipur-1701, Bangladesh
  
Funding Source:
1.  Government Budget:  
  

The yield of BRRI dhan33 and BRRI dhan39 were similar for both irrigated and rainfed plots.  The yield of BRRI dhan46 was also similar for both irrigated (3817 kg/ha) and rainfed plots (3677 kg/ha). The yield of BRRI dhan31 in the supplementary irrigated plots (4107 kg/ha) was higher than the rainfed plots (3661 kg/ha). This is may be due to the drought stress for higher growth duration compared to the two other varieties.  The mean yield of BRRI dhan34 in the irrigated plots is about 200 kg/ha higher than the rainfed plots. The mean yield of BRRI dhan49 was similar in the irrigated (4135 kg/ha) and rainfed (4223 kg/ha) plots. The mean yield of BR11 was higher in the supplementary irrigated plots (4856 kg/ha) compared to the rainfed plots (4040 kg/ha).  The mean yield of BR23 was higher in the supplementary irrigated plots (4607 kg/ha) compared to the rainfed plots (4064 kg/ha).  The mean yield of BRRI dhan30 was higher in the supplementary irrigated plots (4322 kg/ha) compared to the rainfed plots (3878 kg/ha). The mean yield of BRRI dhan40 was slightly higher in the supplementary irrigated plots (3492 kg/ha) compared to the rainfed plots (3214 kg/ha). The mean yield of BRRI dhan41 was slightly higher in the supplementary irrigated plots (4316 kg/ha) compared to the rainfed plots (4121 kg/ha). The mean yield of BRRI dhan44 was higher in the supplementary irrigated plots (4603 kg/ha) compared to the rainfed plots (4123 kg/ha).

  Report/Proceedings
  

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