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Research Detail

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Dr. Md. Shahjahan Kabir
CSO and Head
Agricultural Statistics Division, BRRI

Dr. Md. Ismail Hossin
SSO
Agricultural Statistics Division, BRRI

Experiments are being conducted in the T. Aman and Boro seasons with BRRI released rice varieties since T. Aman 2010-11 and Boro 2011 in Gazipur and different regional stations.

The number of varieties is 27 and 25 in T. Aman and Boro season respectively. The design used is RCB with three replications and the effective plot size (harvest area) is 5-x-2 m2 leaving the boarder. Recommended crop management practices are followed. The newly developed stability model was used to analyse the data. In T. Aman season, BRRI dhan32, BRRI dhan40, BRRI dhan41 and BR11 were found as the most stable while BR3, BRRI dhan51 and BRRI dhan52 appeared to be unstable among the non-aromatic rice. In case of aromatic rice, BRRI dhan38 appeared to be the most stable followed by BRRI dhan37. BRRI dhan28 and BRRI dhan29 was the only most stable variety and BR1, BR2, BR6, BR8 and BR18 appeared to be unstable in Boro season. In case of fine rice BRRI dhan50 appeared to be below average stable in Boro season.

  BRRI varieties, GxE interaction, Abiotic
  BRRI HQ and All R/S of BRRI
  
  00-00-2012
  Variety and Species
  Rice
  1. To standardize the model for stability analysis of BRRI varieties
  2. To determine the stability index of  BRRI released varieties
  3. To maintain season, year and location-wise database on BRRI varieties.
  4. To identify the bio-physical and socio-economic factors causing instability.

Experiments are being conducted in the T. Aman and Boro seasons with BRRI released rice varieties since T. Aman 2010-11 in Gazipur and different Regional Stations. The collaborative regional stations in the T. Aman season are Rajshahi, Rangpur, Comilla, Sonagazi, Barisal, Satkhira and Kushtia and in the Boro season Rajshahi, Rangpur, Comilla, Habiganj, Barisal, Bhanga, Satkhira and Kushtia. In T. Aman season, the number of varieties is 23 and that in Boro is 23. The design used is RCB with three replications and the effective plot size (harvest area) is 5-x-2 m2 leaving the boarder. Recommended crop management practices are followed. Stability analysis of the experimental data was performed using the new developed stability model.

The stability model: The newly developed stability model takes into account the performance of the genotypes across the geographical locations differing in land, soil and other biotic and abiotic factors and over the years characterizing fluctuation of weather variable, floods, drought, etc. In the new model, the stability of a genotype is determined by three parameters. These are:

(1) Measure of yield fluctuation of ith  variety

(2) Measure of performance of ith  variety

(3) Measure of superiority of ith  variety in jth location

  BRRI Annual Report 2011-12,208-209, BRRI, Gazipur.
  
Funding Source:
1.  Government Budget:  
  

Among the non-aromatic T. Aman varieties, BRRI dhan32 and BRRI dhan40 were found stable from year to year although their stability ranks interchange between 1 and 2. BR3 and BRRI dhan33 appeared to be unstable.  BR4, BRRI dhan51 and BRRI dhan52 was found to have bellow average stability and all other aromatic T. Aman varieties appeared to show average stability. Among the aromatic T. Aman rice, BRRI dhan38 appeared to be the most stable followed by BRRI dhan37, while BR5 and BRRI dhan34 appeared to show below average stability. In Boro season, the only stable variety was BRRI dhan29 in each year. BR3, BR9, BR14, BR15, BR16, BR17, BR19 and BRRI dhan36 appeared to have average stability. All other Boro varieties appeared to have below average stability among which BR6 was the most unstable variety followed by BR2 and BR8.

  Report/Proceedings
  

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